Document Millcreek_doc_b02aefb69d

Millcreek Stormwater Information. Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 1 This document has been prepared to provide greater consistency in and access to stormwater information. Municipal Separate Storm Sewer Systems (known as MS4s, often municipalities), construction contractors/developers, and the general public have a responsibility to do their part to keep stormwater pollutant free. The information provided here will be especially useful at assisting construction personnel in performing their stormwater responsibilities, but also provides essential information to anyone involved in stormwater protection. Contents MS4 Stormwater Contact Information 2 MS4 Preferred Best Management Practices (BMPs) 3 How to Apply for a Construction General Permit (CGP) or Common Plan Permit (CPP) and Pre-construction Checklist 78 Construction Stormwater Inspection and Enforcement SOPs 82 Stormwater Inspection Forms 93 Construction General Permit (CGP) and Common Plan Permit 96 Website Links for Other Stormwater Organizations and Stormwater Information 97 MS4 Stormwater Management Plan 98 MS4 Long-term Stormwater Management Program Details 99 IDDE Program and Hotline 100 MS4 Stormwater Educational Material 101 MS4 Stormwater Permit 102 MS4 Stormwater Annual Report 103 ---PAGE BREAK--- MS4 Stormwater Staff Contact Information Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 2 Dan Drumiler – Stormwater Engineer [PHONE REDACTED] [EMAIL REDACTED] Aaron Roberts – Stormwater Operations Manager [PHONE REDACTED] [EMAIL REDACTED] Deejay Allen - Stormwater and Construction Inspector [PHONE REDACTED] [EMAIL REDACTED] Matt Hahn – Stormwater Inspector II [PHONE REDACTED] [EMAIL REDACTED] ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 3 BMP 1- Portable Toilet on Pervious Surface APPLICATION ● Provide temporary sanitary facilities when permanent facilities are too far from activities or are unavailable. INSTALLATION/USE PROCEDURE ● Locate portable toilets away from waters of the state, and at least 10 feet from any storm water conveyance, inlet, curb and gutter, or conduit to a waterway. ● Wherever possible, locate portable toilet upon natural ground and not on impervious surfaces such as asphalt, concrete, or similar ● Prepare a level surface and provide clear access to the toilet(s) for servicing and for on-site personnel ● Wherever possible, locate a portable toilet next to track out pad or provide gravel access pad for maintenance pick up to reduce occurrence of mud track out by service provider. ● Secure portable toilets to prevent tipping e.g. stakes, tie downs, etc. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 4 Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. ● Also see BMP 2- Portable Toilet on Pavement MAINTENANCE/MANAGEMENT ● Portable toilets should be maintained in good working order by licensed service ● Portable toilets should be inspected daily to detect any leaks ● Damaged toilets must be repaired/replaced immediately ● All waste must be deposited in the sanitary sewer system for treatment with appropriate agency approval ● Implement spill BMP immediately upon spill incident ● If track out from the service provider occurs, debris must be removed as soon as practicable. PERFORMANCE ● A portable toilet is expected to contain human waste with zero exposure to storm water. ● A successful portable toilet is clean, effective, and is processed by the appropriate licensed facility. REFERENCE ● Construction General Storm Water Permit (CGP) 2.3.3(f) ● Common Plat Permit (CPP) 2.4.4 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 5 BMP 2- Pavement Mounted Portable Toilet Picture for concept purpose only APPLICATION ● Use portable toilets on pavement only for projects without pervious staging areas. Usually projects within existing right-of-ways. ● Do not install portable toilets on pavement when private property is expected to be used. Generally, portable toilets installed on pavement are necessary for roadway projects but are not acceptable for commercial and residential projects. INSTALLATION/USE PROCEDURE ● When near inlets, always locate portable toilets of inlets. Identify on BMP map. ● Place portable toilet on a surface no steeper than 2% grade. ● Attach portable toilet contractor illustrations, service and any maintenance information. For ground mount toilets provide each corner with 50# weights or as specified by the service contractor. For trailer mounted systems, provide a plan for securing the trailer as specified by the service contractor. ● Provide secondary containment. Submit for oversight authority review. A gutter dam BMP is a good choice. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 6 ● Obtain private or public right of way encroachment permit (or local equivalent) when required by the local authority. ● Attach a copy of the portable toilet manufacturer’s maintenance literature. ● Ensure the spill prevention program includes containment materials and protocols for potential portable toilet spills. ● Ensure maintenance personnel and site workers involved in site operations understand BMP requirements. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Inspect BMP location corresponds with BMP map. Locations are often dynamic for projects within right-of-ways. ● Inspect maintenance per manufacturer requirements ● Inspect for leaks and tank levels ● Inspect anti-tipping system PERFORMANCE ● A portable toilet is expected to contain human waste with zero exposure to storm water. ● A successful portable toilet is clean, effective, and is processed by the appropriate licensed facility. REFERENCE: ● CGP 2.3.3(f), 2.4.4 ● CPP 2.4.4 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 7 BMP 3- Curb Sedimentation Trap APPLICATION ● Use at project boundaries in which final grading is sloped towards pavement or roadways to retain sediment. ● Only applicable when the site is sloped towards the curb such that runoff overtops the curb ● Particularly useful for residential sites when major earth disturbing activities have ceased and final site stabilization (landscape installation) is pending. INSTALLATION/USE PROCEDURE ● Excavate soil behind curb to a depth of 3-4 inches ● Extend the excavation 3-4 feet behind the curb to form a sediment trap ● Should not be installed on a slope that exceeds 5% as it may be ineffective and compromise the integrity of the curb ● Not suitable if underlying soil is expansive or collapsible, refer to the soils report. ● The sedimentation trap may be implemented behind a sidewalk instead of the curb ● The depth and width of the excavation may be increased if more sediment storage is necessary OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 8 Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Inspect at least once every seven calendar days, or once every 14 calendar days and within 24 hours of the occurrence of a storm event of 0.5 inches or greater. ● Remove accumulated sediment when it reaches ½ height of original excavation. PERFORMANCE ● Sediment, or sediment laden water overtopping the curb, leaving the site, and entering the roadway constitutes BMP failure and must be corrected immediately. REFERENCE ● CGP 2.2.3 ● CPP 2.1.2 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 9 BMP 4- Concrete Washout Pan * *Picture for concept only, attach detail for chosen site specific wash out pan APPLICATION Concrete waste management is necessary on construction sites when: ● Concrete, grout, or mortar is used as a construction material. ● Concrete truck drums, chutes, and hoses, or other concrete equipment (e.g. hand tools, screeds, shovels, rakes, floats, trowels, and wheelbarrows) are washed on-site and it is not possible to dispose of all concrete wastewater and washout off-site (ready mix plant, etc.). ● Grout or mortar mixing stations are used. INSTALLATION/USE PROCEDURES ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 10 ● Locate pans next to track-out or parking pad or provide its own anti-track-out system and area for driver chassis washing. Attach illustration with dimensions. Reference other track-out BMPs as needed to manage site conditions. ● Install a sign at each washout location and identify on the BMP map. ● Locate washout facilities a minimum of 50 feet from sensitive areas such as storm drains, open ditches, water bodies, wetlands, or where an infiltration feature will be installed. Protect inlets. ● When the minimum distance from sensitive areas is not practicable, provide secondary containment and attach containment system specifications to this BMP. ● Empty excess concrete onto the ground near the pour site until only liquid cement remains on tools and equipment. ● Wash cement off of the chute, pump equipment, and tools directly into the washout pan. ● Ensure concrete truck operators and concrete transport/disposal service providers have the necessary support to protect water quality. ● The operator is expected to modify the concrete waste management system, location and capacity when necessary as site conditions and operations warrant. ● The operator shall oversee and enforce concrete waste management procedures. ● Educate employees, concrete suppliers, and subcontractors of these concrete waste management requirements. Discuss the concrete management techniques with concrete suppliers before any deliveries are made. ● Incorporate requirements for concrete waste management into concrete supplier and subcontractor agreements. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Washouts must be maintained to provide adequate holding capacity with one foot of freeboard. ● Washout pan must be cleaned, or additional pans provided and ready for use once the concrete washout pan is 70% full. ● Maintenance includes removal and disposal of hardened concrete and excess liquid or slurry. Excess liquid and slurry shall be pumped or evaporated prior to removal of solids. o Attach method of liquid disposal including licensed dumping location. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 11 ● Dispose of all materials in conformance with applicable federal, state, and local regulations. o Do not discharge liquid or slurry to waterways, storm drains or directly onto ground. ● Inspect washout pans at least weekly, and before and after each concrete operation. During extended wet weather conditions, ensure track out is not occurring. o Check overall condition and performance. o Check remaining capacity full) o If using prefabricated pan containers, check for leaks. ● Damaged or leaking washout facilities shall be addressed immediately. PERFORMANCE ● Pans must be water-tight with sufficient volume plus 1 foot freeboard to meet concrete washout needs in between maintenance/service intervals. Attach concrete waste volume calculations and identify the number washout pans required. ● The performance expected of a wash out pan is to contain all pollutants associated with washout of concrete, slurry, mortar, and other products with no discharge at anytime during operations. It is considered a concrete waste management failure when any of the following occur: ● There are leaks, overflows, or spills of concrete waste. The discharge of concrete washout waters is classified as a “Prohibited Discharge” ● Track-out associated with the concrete washout BMP operation. REFERENCE ● CGP 2.3.4 ● CPP 2.9.1 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 12 BMP 5- Concrete Washout Ground Fixed Systems ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 13 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 14 APPLICATION Concrete waste management is necessary on construction sites when: ● Concrete, grout, or mortar is used as a construction material. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 15 ● Concrete truck drums, chutes, and hoses, or other concrete equipment are washed on- site and it is not possible to dispose of all concrete wastewater and washout off-site (ready mix plant, etc.). ● Grout or mortar mixing stations are used. INSTALLATION/USE PROCEDURES ● The washout facility shall be watertight and impermeable. ● The washout facility may be a self-installed structure or a pre-fabricated structure ● For self-installed washout structures, the lining material shall be a minimum of 10-mil polyethylene sheeting and must be free of holes, tears, or other defects that compromise the impermeability of the material. Liner materials shall be installed in accordance with manufacturer’s recommendations. o No seams in the plastic are allowed at the bottom of the washout. The soil base shall be prepared free of rocks or other debris that may cause tears or holes in the plastic lining material. ● Washout facilities shall be constructed and maintained with sufficient quantity and volume to contain all liquid and concrete waste generated by washout operations. ● On large sites with extensive concrete work, multiple washouts may be needed to provide adequate capacity. ● Locate pans next to track-out or parking pad or provide its own anti-track-out system and area for driver chassis washing. Attach illustration with dimensions. Reference other track-out BMPs as needed to manage site conditions. ● A sign shall be installed at each washout location. ● Install the washout at the location specified in the ● Locate washout facilities a minimum of 50 feet from sensitive areas such as storm drains, open ditches, water bodies, wetlands, or where an infiltration feature will be installed. Protect inlets. ● When the minimum distance from sensitive areas is not practicable, provide secondary containment and attach containment system specifications to this BMP. ● Keep the washout areas away from other construction traffic and access areas to reduce the likelihood of accidental damage, spills, or tracking. ● Inspect and verify that concrete washout areas are in place prior to the commencement of concrete work. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 16 ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● When materials are removed from ground fixed concrete washout systems, build a new structure; or, if the previous structure is still intact, inspect for signs of weakening or damage, and make any necessary repairs. Re-line the structure with new 10-mil polyethylene sheeting after each cleaning. ● Washouts must be maintained to provide adequate holding capacity with one foot of freeboard. ● Once the concrete washout system is 70% full, it is time to remove the existing waste material to allow further use or provide an additional washout facility. ● Maintenance includes removal and disposal of hardened concrete and excess liquid or slurry. Excess liquid and slurry shall be pumped or evaporated prior to removal of solids. o Attach method of liquid disposal including licensed dumping location. ● Dispose of all materials in conformance with applicable federal, state, and local regulations. o Do not discharge liquid or slurry to waterways, storm drains or directly onto ground. ● Inspect ground fixed concrete washout systems at least weekly, and before and after each concrete operation. During extended wet weather conditions, ensure track out is not occurring. o Check overall condition and performance. o Check remaining capacity full) o Check for leaks ● Damaged or leaking washout facilities shall be addressed immediately. ● When concrete washout areas are no longer required for the work, the hardened concrete and containment system shall be removed and disposed of at a licensed waste facility. Attach information of disposal facility. Where concrete is recycled attach recycling facility information. ● Holes, depressions, or other ground disturbances caused by the removal of concrete washout areas shall be backfilled, repaired, and stabilized to prevent erosion. PERFORMANCE ● The performance expected of a wash out pan is to contain all pollutants associated with washout of concrete, slurry, mortar, and other products with no discharge at any time during operations. It is considered a concrete waste management failure when any of the following occur: ● There are rips, tears, or defects in the containment system ● Seepage overflows are observed or waste is outside of the containment system ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 17 ● Track-out associated with the concrete washout BMP operation. REFERENCE ● CGP 2.3.4, ● CPP 2.4.5, 2.9.1 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 18 BMP 6- Small Concrete Management Operations * *Picture for concept purpose only APPLICATION ● Use for small pours only. Usually for single lot residential homes or other minor projects where the washout volume is small and using a proprietary concrete washout pan service is not practical. INSTALLATION/USE PROCEDURES ● Small metal pan, plastic pools or equal portable watertight disposable container that can contain caustic materials. Attach dimensions of containers. ● Calculate concrete waste volume required. Attach calculations and identify the number of containment systems needed. Simply repeat this BMP for each day’s concrete operation. Provide one additional container for redundancy. ● Maximize the capacity of the small containment system: o Empty excess concrete onto the ground near the pour site. o Wash cement off of the chute, pump equipment, and tools directly into the washout container. ● Place containers on a flat surface, near the track-out where there is enough room to wash the chassis and remove mud from the tires. Locate on the site BMP map. ● Containers are not allowed in roadway right of ways. ● Do not haul containers away until the waste concrete is set and all water has evaporated. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 19 ● Ensure the workforce is informed how to use your concrete management BMP. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Cover the containment system when not in use if a rain event is anticipated. ● Individual containers should no longer be used for washout once the volume capacity has reached 70% full. Utilize an additional container. ● This is a one time disposable BMP, typical maintenance is not necessary. Any exposed concrete washing and disposal operations are considered a BMP failure because the operation was not adequately anticipated and implemented. ● When the daily concrete management operation is completed simply repeat this BMP. PERFORMANCE It is considered a concrete waste management failure when any of the following occur: ● Washout container overflows. ● Containers are hauled away prior to concrete set up and when liquid was not completely evaporated. ● When track-out results from washout container inadequate placement. ● When supply truck chassis are being washed outside of the containment system. REFERENCE: ● CGP 2.3.4 ● CPP 2.4.5, 2.9. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 20 BMP 7- Pavement Saw Cutting-Wet APPLICATION ● Use Pavement Saw Cutting-Wet BMP when cutting pavement with wet saw, especially in curb and gutter applications. ● Appropriate for use when dry cutting is not allowed or where dust is a concern. INSTALLATION/USE PROCEDURES ● Install 6” min diameter sand or gravel bags in a manner to contain slurry from moving downslope from the cutting operation. Double up bags as necessary. ● Install enough bags anticipating the volume of cut slurry. ● Schedule cutting during dry weather periods. ● Remove slurry at the end of day or prior to rain events whichever comes first. When wet conditions exist, mix slurry with dirt or other absorbing material and remove immediately. o Dump waste in concrete washout containment system. o Dry the waste in a contained area and dispose of waste in regular waste management container. ● Sweep until no more waste can be picked up with a square nose shovel. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 21 ● Do not use water to rinse slurry from the cutting operation area, dry clean up methods only as described above. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● BMP is installed and removed with each cutting operation, no maintenance is necessary. PERFORMANCE ● Utilizing water during saw cutting is a great way to capture dust from cutting operations so that dust does not travel out of the cutting operation area nor pollute the air. ● Additionally utilization of this BMP will prevent high density opacity for nearby drivers and operators. ● Performance criteria to judge application success would be that airborne dust does not occur and slurry is contained and disposed per BMP. It is considered a BMP failure when any of the following occur: ● The dam created with sand or gravel bags overflows ● Cutting operations are not cleaned up by the end of day or prior to wet conditions. ● Any waste material is not disposed per BMP or otherwise can contaminate water resources REFERENCE: ● CGP 2.3.4 ● CPP 2.9.1 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 22 BMP 8- Pavement Saw Cutting-Dry APPLICATION ● Use for pavement cutting on directly connected pavements or where cutting dust can be washed to drainage systems, especially in curb and gutter applications. INSTALLATION/USE PROCEDURES ● Schedule cutting during dry weather periods. ● Remove cutting dust immediately following the cutting operation. ● Sweep until no more waste can be picked up with a square nose shovel. ● Dispose of cutting dust in a concrete waste container or regular waste management container. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● BMP is installed and removed with each cutting operation, no maintenance is necessary. PERFORMANCE ● BMP application success would be that dust is contained to the cutting operation area and disposed per BMP. It is considered a BMP failure when any of the following occur: ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 23 ● Cutting dust enters drainage systems ● Cutting operations are not cleaned up immediately following the cutting operation ● Any waste material is not disposed per BMP or otherwise can contaminate water resources REFERENCE: ● CGP 2.3.4 ● CPP 2.9.1 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 24 BMP 9- Area Drain Filtration APPLICATION ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 25 ● Straw wattles or filter tubs are an open weave, mesh tube that is filled with a filter material (compost, wood chips, straw, coir, aspen fiber, or a mixture of materials) used to divert or filter stormwater. ● Straw wattles are a temporary BMP that can be used in the rough grading process of construction. Straw wattles and large filter sock can be used with or without storm drain inlet tops, but not ready for grading of roadway. ● Can be used for area drains until final stabilization is complete. INSTALLATION/USE PROCEDURES ● On natural ground tubes shall be staked with 2 inch by 2 inch wooden stakes at a maximum spacing of 4 feet. Rebar or similar metal stakes may be used instead of wooden stakes. Filter tubes shall be embedded a minimum of two inches when placed on soil. ● Sand or rock bags shall be placed at a minimum, one foot from each end of the tube and at the middle of the tube. ● The end of tubes shall overlap a minimum of 18 inches when multiple tubes are connected to form a linear control along a contour or a perimeter. ● Straw wattles should wrap around the entirety of the storm drain to prevent sediment and other pollutants from entering the storm drain. ● Follow manufacturer's recommendations for staking or other methods of approved securement when used on pavement. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Check straw wattles material to make sure it has not become clogged with sediment or debris. Clogged filter tubes usually lead to standing water behind the filter tube after a rain event. Sediment shall be removed from behind the filter tube before it reaches half the height of the exposed portion of the tube. ● The straw wattles should be checked to ensure it is in continuous contact with the soil at the bottom of the embedment trench. Closely check for rill erosion that may develop under the filter tubes. Eroded spots must be repaired and monitored to prevent reoccurrence. If erosion under the tube continues, additional controls are needed. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 26 ● Any straw wattles destroyed by construction operations or UV degradation will need to be removed and replaced. PERFORMANCE It is considered a BMP failure when any of the following occur: ● Damaged or not installed to the BMPs details or attached manufacturer illustrations ● Sediment depth around wattle exceeds maintenance tolerances. ● Opening or gaps in straw wattles. REFERENCE ● CGP 2.2.10 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 27 BMP 10- Rock Check Dam for Channels APPLICATION ● Check dams are used in swales and drainage ditches (including those along linear projects such as roadways). ● They can also be used in short swales down a steep slope to reduce velocities. ● Check dams shall not be used in live stream channels. ● Check dams should be installed before the contributing drainage area is disturbed, so as to mitigate the effects on the swale from the increase in runoff. ● If the swale itself is graded as part of the construction activities, check dams are installed immediately upon completion of grading to control velocities in the swale until stabilization is completed. INSTALLATION/USE PROCEDURES ● Install rock check dam per illustrated detail. D=24” or less and install the center of the dam about 6” lower than the sides. ● Check dams should be used in conjunction with other sediment reduction techniques prior to releasing flow offsite. ● Use 4” or greater rock diameter and non-woven geotextile fabric under check dams of 12 inches in height or greater. When high flow rates and velocities are anticipated engineering is required. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 28 ● Dam height should be between 9 and 36 inches and less than one-third the depth of the channel ● Dams should be spaced such that the top of the dam is at the same elevation as the toe of the upstream dam. On channel grades flatter than 0.4 percent, check dams should be placed at a distance that allows pools to form between each check dam. ● The top of the side of the check dam shall be a minimum of 12 inches higher than the middle of the dam. In addition, the side of the dams shall be embedded a minimum of 18 inches into the side of the drainage ditch, swale or channel to minimize the potential for flows to erode around the side of the dam. ● Use geotextile fabric (of appropriate tensile strength, puncture rating and apparent opening size) under check dams of 12 inches in height or greater. ● Loose soil, wood chips, compost, and other floatable materials that are transportable during runoff should not be used to construct a check dam. ALTERNATIVE DESIGN ● Rock Check Dams: o Stone shall be well graded with stone size ranging from 3 to 6 inches in diameter for a check dam height of 24 inches or less. The stone size range for check dams greater than 24 inches is 4 to 8 inches in diameter. ● Rock Bag Check Dams: o Rock bag check dams should have a minimum top width of 16 inches. o Minimum rock bag dam height of 12 inches would consist of one row of bags stacked on top of two rows of bag. The dam shall always be one more row wide than it is high, stacked pyramid fashion. o Bags should be filled with pea gravel, filter stone, or aggregate that is clean and free of deleterious material. o Sand bags shall not be used for check dams, due to their propensity to break and release sand that is transported by the concentrated flow in the drainage swale or ditch. o Bag material shall be polypropylene, polyethylene, polyamide or cotton burlap woven fabric, minimum unit weight 4-ounces-per-square-yard, Mullen burst strength exceeding 300-psi as determined by ASTM D3786, Standard Test Method for Hydraulic Bursting Strength of Textile Fabrics-Diaphragm Bursting Strength Tester Method, and ultraviolet stability exceeding 70 percent. o PVC pipes may be installed through the dam to allow for controlled flow through the dam. Pipe should be schedule 40 or heavier polyvinyl chloride (PVC) having a nominal internal diameter of 2 inches. ● Sack Gabion Check Dams: ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 29 o Sack gabion check dams may be used in channels with a contributing drainage area of 5 acres or less. o Sack gabions shall be wrapped in galvanized steel, woven wire mesh. The wire shall be 20 gauge with 1 inch diameter, hexagonal openings. o Wire mesh shall be one piece, wrapped around the rock, and secured to itself on the side using wire ties or hog rings. o Sack gabions shall be staked with ¾ inch rebar at a maximum spacing of three feet. Each wire sack shall have a minimum of two stakes. o Stone shall be well graded with a minimum size range from 3 to 6 inches in diameter. ● Organic Filter Tube Check Dams: o Organic filter tubes may be used as check dams in channels with a contributing drainage area of 5 acres or less. o Organic filter tubes shall be a minimum of 12 inches in diameter. o Filter material used within tubes to construct check dams shall be limited to coir, straw, aspen fiber and other organic material with high cellulose content. The material should be slow to decay or leach nutrients in standing water. o Staking of filter tubes shall be at a maximum of 4 foot spacing and shall alternate through the tube and on the face of the tube. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Inspect the check dam system each report period and after storm events. ● Remove silt when sediment accumulation reaches approximately 1/3 the height of the dam. ● Inspect for erosion beneath and around the check dam (particularly where the edge of the dam meets the side of the channel) and restore as needed each report period. ● If erosion continues to be a problem, modifications to the check dam or additional controls must be engineered. PERFORMANCE ● Check dam systems are intended to perform as engineered up to .25” of rain fall ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 30 ● Rock check dams are performing as intended if the drainage channel they are protecting does not develop deep erosive gulleys between dams and the dam itself is not being undercut by erosion or eroded to either side of the dam. ● Due to the minimal sediment capture capability of check dams, good performance will include accumulations of sediment on the upstream side of dams between maintenance intervals. It is considered a BMP failure when any of the following occur: ● System not installed per illustrated detail, system not maintained, or system damaged by construction operations. ● Erosion damage resulting in variance from detail dimensions REFERENCE ● U-CGP 2.2.11 – “Minimize erosion of constructed or natural site drainage feature channels and their embankments, outlets, adjacent streambanks, slopes, and waters. Use erosion controls and velocity dissipation devices within and along the length of any constructed or natural site drainage feature channel and at any outlet to slow down runoff and minimize erosion.” ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 31 BMP 11- Straw Wattle Check Dam for Channels APPLICATION ● Check dams are used in swales and drainage ditches (including those along linear projects such as roadways). ● They can also be used in short swales down a steep slope to reduce velocities. ● Check dams shall not be used in live stream channels. ● Check dams should be installed before the contributing drainage area is disturbed, so as to mitigate the effects on the swale from the increase in runoff. ● If the swale itself is graded as part of the construction activities, check dams are installed immediately upon completion of grading to control velocities in the swale until stabilization is completed. INSTALLATION/USE PROCEDURE ● Dam height should be between 9 and 36 inches and less than one-third the depth of the channel ● Dams should be spaced such that the top of the dam is at the same elevation as the toe of the upstream dam. On channel grades flatter than 0.4 percent, check dams should be placed at a distance that allows small pools to form between each check dam. ● The top of the side of the check dam shall be a minimum of 12 inches higher than the middle of the dam. In addition, the side of the dams shall be embedded a minimum of 18 inches into the side of the drainage ditch, swale or channel to minimize the potential for flows to erode around the side of the dam. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 32 ● Check dams should be used in conjunction with other sediment reduction techniques prior to releasing flow offsite. ● Use geotextile fabric (of appropriate tensile strength, puncture rating and apparent opening size) under check dams of 12 inches in height or greater. ● Loose soil, wood chips, compost, and other floatable materials that are transportable during runoff should not be used to construct a check dam. ALTERNATIVE DESIGN ● See “Rock Check Dam for Channels” OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Inspect the check dam system each report period and after storm events. ● Remove silt when sediment accumulation reaches approximately 1/3 the height of the dam. ● Inspect for erosion beneath and around check dam (particularly where edge of the dam meets the side of the channel) and restore as needed each report period. ● If erosion continues to be a problem, modifications to the check dam or additional controls must be engineered. PERFORMANCE ● Check dam systems are intended to perform as engineered up to .25” of rain fall ● Check dams are performing as intended if the drainage channel they are protecting does not develop deep erosive gulleys between dams and the dam itself is not being undercut by erosion or eroded to either side of the dam. ● Due to the minimal sediment capture capability of check dams, good performance will include accumulations of sediment on the upstream side of dams between maintenance intervals. It is considered a BMP failure when any of the following occur: ● System not installed per illustrated detail, system not maintained, or system damaged by construction operations. ● Erosion damage resulting in variance from detail dimensions. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 33 REFERENCE ● U-CGP 2.2.11 – “Minimize erosion of constructed or natural site drainage feature channels and their embankments, outlets, adjacent streambanks, slopes, and waters. Use erosion controls and velocity dissipation devices within and along the length of any constructed or natural site drainage feature channel and at any outlet to slow down runoff and minimize erosion.” ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 34 BMP 12- Culvert Sediment Barrier APPLICATION A culvert inlet sediment barrier is a temporary rock barrier at a culvert inlet. The purpose of the barrier is to reduce the amount of sediment that enters the culvert by creating a small ponding area for the sediment to settle out. ● For use on a site with open culverts within the project area that are exposed to runoff. INSTALLATION/USE PROCEDURES ● A geotextile should be placed between the stone barrier and the natural ground. ● Surround all sides of the culvert with Class II Channel Lining at a minimum of 4 feet from the culvert. ● The barrier must be designed to ensure that no bypasses occur up to 0.5” of rainfall ● Control the location of the sediment barrier spillway by placing an overflow notch at a selected location in the middle portion of the barrier. o The notch should be at least six inches lower than the rest of the barrier. o The downgradient portion of the overflow notch should be protected from erosion caused by potential spillover with Class II Channel Lining. ● The upstream face of the barrier should consist of smaller stone to decrease the flow rate through the stone. ● If a culvert inlet sediment barrier is intended to be used for long-term storm water management, design and installation must be approved by an accredited engineer. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 35 OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Inspect the condition of the sediment barrier weekly and after every rainfall event greater than one-half inch. Erosion and scouring would necessitate barrier reinforcement. ● Remove sediment and/or debris when depth reaches one-half the height of the barrier. PERFORMANCE ● A culvert inlet sediment barrier is expected to utilize sediment deposition to the maximum extent possible before allowing runoff to enter the culvert. ● The overflow spillway should not compromise the capacity of the berm to slow the flow of the first half inch of rain REFERENCE ● CGP 2.2.11 ● CPP 2.3 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 36 BMP 13- Silt Fence APPLICATION A silt fence when properly installed and maintained can help mitigate the discharge of sediment in storm water runoff. It can be used in multiple applications such as: ● project boundaries ● side(s) of erodible stockpiled materials. ● Minor channels or slopes when calculations show runoff volumes will not exceed the anticipated volume capacity and strength of the system. A silt fence is not intended for: ● Controlling large volumes of concentrated runoff. Use an alternative BMP. This case usually warrants retention ponds. ● Border control or limits of construction site only (i.e. not intended to fulfill the same purpose as construction fencing) INSTALLATION/PROCEDURE/CALCULATIONS ● Install silt fence per detail dimensions, description and materials or - ● For proprietary systems attach all design, performance, installation, maintenance requirements and the proprietary BMP detail documents. All requirements of this BMP remain except for any differences necessary to achieve design performance. ● Install silt fence of all necessary exposed boundaries as shown by the grading sheet, demolition map, phasing map, and or BMP map, etc. Attach topographic maps for all construction phases to this BMP or reference where these maps are found in the ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 37 ● Install silt fence along contours of the slope to maximize effectiveness. ● Overlap each fence segment in a series by at least 6 inches to prevent gaps. ● The end of the silt fence must be installed in a “J-hook” to treat runoff effectively. Flare the ends uphill to provide storage capacity of storm water runoff ● Attach engineering calculations for sites with steep slopes, for large areas clear of vegetation and when runoff rates or when runoff volumes behind fences will feasibly cause failure for storm events less than 2yr 24hr intensities and volumes. In this case, engineering calculations are required or as allowed by oversight authority. ● Ensure all workers are trained on proper installation, maintenance, and inspection of silt fences. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Inspect the silt fence prior to a forecasted rain event and during weekly inspections. ● Maintain or repair within the period given by the inspector following city and state code within the reporting period or prior to storm event. ● Inspect silt fence after storm events. Restore any fence damaged back to the installation requirements. ● Remove accumulated sediment when it reaches one-third fence height or as specified by proprietary system. PERFORMANCE ● A silt fence allows water to pass trapping sediment behind. Runoff going around, under or over silt fence would indicate a silt fence system failure. ● A silt fence is expected to filter sediment for storm events less than 2yr 24hr storm events. Fence failures for events less than a 2yr 24hr storm feasibly means the silt fence was either designed, installed, was unmaintained, was damaged by construction operations or the silt fence was not the best BMP for the site exposure. When the area tributary to the fence results in runoff rates greater than silt fence design capability, provide conveyance swales and retention pond BMPs or as per other CGP options. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 38 REFERENCE ● CGP 2.2.3, 2.2.5, 2.2.11, 2.2.12, 7.3.3 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 39 BMP 14- Earth Berm Barrier APPLICATION A temporary containment control constructed of compacted soil. ● Construct around waste and materials storage area. ● Construct around staging and maintenance areas. ● Construct around vehicle parking and servicing areas. Not intended for erosion control. INSTALLATION/USE PROCEDURES ● Construct an earthen berm downhill of the area to be controlled. The berm should surround fueling facilities and maintenance areas on three sides to provide containment. ● Berm needs to be a minimum of 1 foot tall by 1 foot wide and be compacted by earth moving equipment. ● The berm should be protected from heavy equipment traffic through signage or training OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Observe daily for any non-stormwater discharge. ● Look for runoff bypassing ends of berms eroding, or breaching. ● Repair or replace damaged areas of the berm and remove accumulated sediment. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 40 ● Recompact soil around the berm as necessary to minimize erosion rates. PERFORMANCE ● An earthen berm should be able to contain incidental spills in the area that it is installed while the spill control plan in the is being put into effect. REFERENCE ● CGP 2.2.11 ● CPP 2.3 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 41 BMP 15- Filter Tubes on Slopes APPLICATION Filter tubes are also called fiber rolls, fiber logs, wattles, mulch socks, and/or coir rolls. The tubes can be filled with organic material (compost, wood chips, straw, coir, aspen fiber, or a mixture of materials) or material. Though filter tubes have many uses, this BMP focuses on slope management. ● If the tubes will be left onsite as part of the final stabilization plan (such as in Arid and Semi-Arid areas with exceptions to final stabilization timeline requirements) they must be constructed of 100 percent biodegradable jute, coir, sisal or similar natural fiber or 100 percent UV photodegradable plastic, polyester or material. ● Filter tubes can be used to treat sheet flow over a short distance and can be used on steep slopes as both sediment and erosion control. ● Filter tubes work by detaining flow and capturing sediment as a linear control along the contours of a slope, or as a perimeter control down-slope of a disturbed area (when appropriately sized). ● Filter tubes are most effective with coarse to silty soil types; additional controls may be needed to remove fine silts and clays suspended in stormwater. INSTALLATION/USE PROCEDURES ● Filter tubes should be installed along the contour. ● Tubes shall be staked with 2 inch by 2 inch wooden stakes at a maximum spacing of 4 feet. Rebar or similar metal stakes may be used instead of wooden stakes. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 42 ● When placed on pavement, sand or rock bags shall be placed abutting the down-slope side of the tubes to prevent runoff from dislodging the tubes. At a minimum, bags shall be placed one foot from each end of the tube and at the middle of the tube. ● Filter tubes shall be embedded a minimum of three inches when placed on soil. Placement on rock shall be designed as placement on pavement. ● The end of tubes shall overlap a minimum of 18 inches when multiple tubes are connected to form a linear control along a contour or a perimeter. ● Loose mulch material shall be placed against the log on the upstream side to facilitate contact with the ground. ● The last 10 feet (or more) at the ends of a line of tubes shall be turned upslope to prevent bypass by stormwater. Additional turned-upslope of tubes may be needed every 200 to 400 linear feet, depending on the traverse slope along the line of tubes. ● The most common sizes of tubes are 6 to 24 inches in diameter; however, tubes are available in sizes as small as 4 inches and up to 36 inches in diameter. The designer shall specify a diameter based on the site application. Tubes less than 8 inches in diameter when filled will require more frequent maintenance if used. ● When using manufactured tubes, the manufacturer’s recommendations for diameter and spacing based on slope, flow velocities, and other site conditions shall be followed and documented in a site’s OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Organic filter tubes should be inspected regularly each inspection period. ● The filter tube should be checked to ensure that it is in continuous contact with the soil at the bottom of the embedment trench. Closely check for rill erosion that may develop under the filter tubes. Eroded spots must be repaired and monitored to prevent reoccurrence. If erosion under the tube continues, additional controls are needed. ● Staking shall be checked to ensure that the filter tubes are not moving due to stormwater runoff. Repair and re-stake slumping filter tubes. Tubes that are split, torn or unraveling shall be repaired or replaced. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 43 ● Check the filter tube material to make sure that it has not become clogged with sediment or debris. Clogged filter tubes usually lead to standing water behind the filter tube after the rain event. Sediment shall be removed from behind the filter tube before it reaches half the height of the exposed portion of the tube. PERFORMANCE ● Organic filter tubes are performing as intended if sheet flow of runoff is passing over or through the barrier and not simply around it, bypassing the control. ● Additionally, performance is achieved if the filter tube barrier is effectively minimizing the off-site discharge of sediment from the drainage area it is controlling and does not develop erosive rills/gullies between filter tubes and the tubes are not being undercut by erosion or eroded to either side of the barrier. ● Due to the relatively smaller sediment capture capability of these filter tubes, as compared to taller barriers, good performance will include accumulations of sediment on the upstream side of filter tubes until maintenance occurs, which will likely require more frequent maintenance. REFERENCE ● CGP 2.2.3, 2.2.5, 2.2.11 CPP 2.3 BMP 20- Inlet Filter with Gutter Dam Combo APPLICATION ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 44 ● This BMP allows sediment laden storm water to be filtered by inlet cover and the gutter dam. Installing the gutter dam on the end of the inlet will increase filter effectiveness and reduce sediment and debris by-pass. This configuration can reduce passing higher volumes ● This BMP allows for runoff by-pass during intense storm events but when adequately maintained can minimize sediment reaching storm water inlets. Inlet cover only BMPs should have secondary containment built in. ● Use Inlet Filter Gutter Dam Combo BMP for at grade inlets. ● Warning: This BMP is easily damaged by vehicles that park along the curb and gutter, and by snow removal operations. INSTALLATION/USE PROCEDURES ● Install 6” min dia sand or gravel bags. Double up bags as necessary. ● Install upstream of inlets. ● This gutter dam system is working when the first dam is holding more sediment than the dams. When the sediment collection is about the same then something is wrong. ● This system can scour out easily and needs regular maintenance to be effective. ● Inform subcontractors and suppliers of the gutter dams placement to roadside parking from damaging the sand or gravel bags. ● Train inspection and maintenance team ● This BMP is designed for 1/4” (~2yr 10min intensity) rain storm events. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Anticipate significant storm events, repair damage and remove sediment deposits prior to storm events that could scour sediment deposits from the gutter dam. ● Inspect, remove sediment and repair gutter dam regularly during the report period and following each storm event. Check for out of place or broken bags, and torn or punctured fabric. ● Following storm events the first dam should have more sediment than the dams. When inspection shows failure persists, even with regular maintenance, a third ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 45 dam should be installed. If the gutter dam system does not perform as intended, a different or additional BMP is warranted. ● Inspect for sediments and remove with shovel and broom or vacuum tools. ● When fabric removal or replacement results in sediment dropping into the inlet, use hydro vacuum machinery or safely remove by other means ● Bring awareness to workforce and suppliers parking near the gutter dam. ● Check during storm events and prevent driving hazardous resulting from surface water conditions. PERFORMANCE ● A gutter dam system is expected to slow the flow of runoff in the gutter to allow for sediment deposition. Erosion control of non-stabilized sediment should be used in conjunction with a gutter dam system. This BMP should be utilized as a secondary control to erosion control BMPs. It is considered a BMP failure when any of the following occur: ● When storm events less than ¼” of rain results in significant scour an alternative BMP is warranted. ● When regular damage occurs to the gutter dam system due to traffic or snow operations an alternative BMP is warranted. ● When sediment deposits are equal to or greater in the dam following storm events of 1/4” or less, the BMP is not adequate and warrants a different BMP. REFERENCE: ● CGP 2.2.10 ● CPP 2.1.3 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 46 BMP 21- Solid Waste Management APPLICATION ● This BMP is necessary when construction activities generate solid waste that needs to be collected and disposed of properly to prevent environmental contamination. ● Use this BMP when: The site generates solid waste, including packaging materials, scrap construction materials, masonry products, timber, pipe and electrical cuttings, plastics, styrofoam, concrete, demolition debris; and other trash or building materials that could potentially contaminate stormwater if not managed correctly. INSTALLATION/USE PROCEDURES ● Selection Criteria: Use durable, watertight containers dumpster, trash receptacle) that are appropriately sized for the volume of waste generated on-site. ● Placement: position dumpsters on a flat, stabilized surface, away from storm drains and water bodies. Identify these locations on the site plan. ● Usage: ensure all construction waste is placed inside the dumpster. Do not overfill; waste should not extend beyond the sides or top of the dumpster. Do not dispose of liquids in this BMP. Most dumpsters and garbage trucks are not water tight. ● Containment: Provide containment or cover for waste that is blowable or that can leach nutrients, metals, pesticides, herbicides, oil, grease, bacteria, or other pollutants. ● Segregation: separate hazardous waste from non-hazardous waste and use appropriately labeled and secured containers for hazardous materials. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 47 ● Locate on parking pad or next to track-pad to prevent track-out when servicing. Show location on site BMP map. ● Do not install in roadways without approval of local municipality. This usually means obtaining a local right-of-way encroachment permit or equal to stage dumpsters in right-of-ways. ● Train workforce. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Ensure the workforce is informed about proper waste disposal procedures and the importance of maintaining the integrity of waste management BMPs. ● Operator is expected to modify the solid waste management system, location and capacity when necessary as site conditions and operations warrant. ● Inspect dumpsters for leaks, damage, and proper cover. ● Collect any trash around the construction site daily and deposit it in the waste container at designated collection areas. ● Arrange for regular waste removal to a licensed facility often enough to prevent overfilling. ● Contain and clean up spilled waste or overflow immediately. PERFORMANCE A solid waste management BMP is considered effective if: ● All construction and domestic waste generated is contained ● No incidents of dumpster overflow or leaks ● No visible waste or debris around the construction site or dumpster area REFERENCE ● CGP 2.3.3 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 48 BMP 22- Chemical/Hazardous Materials Management APPLICATION ● Use Chemical/Hazardous Materials Management BMP when chemicals or hazardous materials are used or stored at the construction site. INSTALLATION/USE PROCEDURES ● Store chemicals and/or other hazardous materials in sealed, clearly labeled containers. ● Safety Data Sheets (SDS) specific to each chemical must be accessible on site. ● When chemicals/hazardous materials are not in use, store materials in such a way that they are not exposed to stormwater or runoff. (covered and off the ground) ● Storage and use areas must be located away from waters of the state, sensitive areas, and storm water conveyance systems ● Submit illustration or detail for secondary containment system when secondary containment and/or cover is required (containers more than 55 gallons); such as drip pan, spill containment pallets, or spill berm with impermeable liner. ● Attach a spill plan and provide a spill kit in good working condition sufficient to address small spills and protect water quality. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Train employees and subcontractors in chemical/hazardous materials BMPs. ● Regularly inspect the chemical storage area and the construction site for evidence of spills ● Spills must be properly cleaned up with dry clean up methods only. ● For spills that occur on permeable surfaces, remove contaminated material before leaching occurs and dispose according to manufacturer’s recommended method of disposal and in compliance with Federal, State, Tribal, and local requirements ● Large spills must be documented and reported according to Section 2.3.6 of the CGP. ● Keep ample supplies of spill cleanup materials on-site and perform any repairs necessary to contain chemicals appropriately immediately. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 49 ● Dispose of expired or used up hazardous materials in accordance with the manufacturer’s recommended method of disposal and in compliance with Federal, State, Tribal, and local requirements PERFORMANCE ● This BMP is expected to contain chemical/hazardous materials in such a way that it cannot pollute the environment. ● No pollutants are allowed to reach storm water conveyance systems or waters of the state REFERENCE ● CGP 2.3.3 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 50 BMP 23- Onsite Equipment Fueling APPLICATION ● Use when fixed onsite fueling tanks are planned. INSTALLATION/USE PROCEDURES ● Locate fueling operations a minimum of 50 feet from receiving waters, constructed or natural site drainage features, and storm drain inlets. If infeasible due to site constraints, store containers as far away from these features as the site permits. If site constraints prevent you from storing containers 50 feet away from the features identified, you must document in your the specific reasons why the 50-foot setback is infeasible. ● Store fuels in sealed, clearly labeled containers. ● Containers must be covered and/or have secondary containment (curbing, spill berms, dikes, spill containment pallets, double-walled storage tank) ● Submit illustration or detail for secondary containment of fuel containers and secondary containment used during active fueling (drip pan, drop cloth, etc) ● Discourage topping-off of fuel tanks. ● Carry out all Federal and State requirements regarding stationary above ground storage tanks. (40 CF Sub. J) Avoid mobile fueling of mobile construction equipment around the site; rather, transport the equipment to designated fueling areas. ● Create and attach a Spill Plan specific to the project. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 51 ● If you fuel many vehicles or pieces of equipment, consider using an off-site fueling station. These areas are better equipped to handle fuel and spills properly. ● Provide a copy of your off site written policy to the oversight authority for review OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Fuel equipment in designated areas only ● Train employees and subcontractors in proper fueling and cleanup procedures. ● Regularly check for leaks and damage including but not limited to: tanks, hoses, and secondary containment. ● Keep ample supplies of spill cleanup materials on-site and perform any repairs necessary to contain fuel appropriately immediately. ● If spill occurs, use dry clean up methods and dispose of spill clean up materials to a proper licensed facility. ● Large spills must be documented and reported according to Section 2.3.6 of the CGP. PERFORMANCE ● Onsite equipment fueling BMPs are expected to protect stormwater to the extent that no fuel, oil, or solvents are allowed to pollute waters of the state or storm water conveyances. REFERENCE CGP 2.3.1 BMP 26- Sediment Basin ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 52 APPLICATION Sediment basins serve as treatment devices which can be used on a variety of project types. They are normally used in construction projects where: ● Large areas of land drain to the basin ● At the outlet of disturbed watersheds 10 acres or larger ● At the outlet of smaller watersheds as necessary ● Where post construction basins will be located ● for disturbed upstream drainage areas of 5 acres or more INSTALLATION/USE PROCEDURES ● Determine the number of basins needed. In some cases, it is more effective to have multiple smaller basins versus one large basin. This is particularly important in areas with larger-grained sediments. In addition, potential damage from basin failure can be minimized by using multiple smaller basins, versus one large basin. ● Whenever possible, construct the sedimentation basins before clearing and grading work begins. ● Construct sediment basins at locations that are accessible for cleanout. ● Situate the basin or impoundment outside of any water of the state and any natural buffers. ● Design the basin or impoundment to avoid collecting water from wetlands or high ground water. ● Design the basin or impoundment to provide for either: The calculated volume of runoff from the 2-year, 24-hour storm; or 3600 cubic feet per acre drained. ● Utilize outlet structures that withdraw water from near the surface of the sediment basin or similar impoundment, unless infeasible. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 53 ● Use erosion controls and velocity dissipation devices to prevent erosion at inlets and outlets. ● Sediment basins and ponds must be installed only within the property limits where failure of the structure would not result in loss of life, damage to homes or buildings, or interruption of use or service of public roads or utilities. ● Sediment basins and ponds are attractive to children and can be very dangerous. Local ordinances regarding health and safety must be adhered to. If fencing of the pond is required, the type of fence and its location should be shown on the Stormwater Pollution Prevention Plan ● Because of additional detention time, sediment basins may be capable of trapping smaller sediment particles than traps. However, they are most effective when used in conjunction with other BMPs such as seeding or mulching. ● Sediment basins can be converted to permanent structures after completion of the construction project. Remove all excess sediment from the basin. The containment volume must meet the design specifications of the approved plan set. The inside of a permanent sediment basin should be stabilized to meet local and UPDES requirements. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Inspect after each rainfall event and at a minimum as part of any regularly scheduled inspections. ● Repair any damage to the berm, spillway, sidewalls and outlet structures or mechanisms. ● Remove accumulated sediment to maintain at least one-half of the design capacity and conduct all other appropriate maintenance to ensure the basin or impoundment remains in effective operating condition. ● Check outlet for sedimentation/erosion of downgradient area and remediate and/or install downgradient BMPs as necessary. PERFORMANCE ● Sediment basins are at best only 70-80 percent effective in trapping sediment which flows into them. Therefore, they should be used in conjunction with erosion control ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 54 practices such as temporary seeding, mulching, diversion dikes, etc. to reduce the amount of sediment flowing into the basin. ● A type of outlet being used with increasing frequency is the floating skimmer. Some early tests indicate that the skimmer (which draws water only from the surface) might be more effective at retaining sediment in the basin than the standard riser and barrel configuration. REFERENCE ● CGP 2.2.12, 7.3.5 ● Drainage Design Manual for City ● Salt Lake County Best Management Practices for Construction Activities ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 55 BMP 27- Rock Track Out Pad APPLICATION ● Use this BMP when vehicles and equipment operations require egress from the project property during wet conditions resulting in sediment track out. This system works by shaking and rubbing the tires(from the large rocks) as the wheels pass over the rocks, therefore the longer the rock path the better. Note, small rocks will not shake or rub mud off tires like large rocks. INSTALLATION/USE PROCEDURE ● Determine the ingress/egress location(s) allowed by the oversight authority and show them on the site plan. ● Use 8” rock for the track out pad at a minimum depth of 8” and use dimensions described in the illustration above. ● Workforce and subcontractors must utilize the track out pad when leaving the construction site. ● Move vehicles forward and in reverse until mud is removed from tires. ● Stop, and inspect for rocks wedged in dual tires and mud sticking to tires. Remove wedged rocks and any remaining mud sticking to tires either manually or by continuing the forward and reverse action. ● Ensure the workforce is trained regarding track-out BMP requirements. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 56 ● Use of Sweeping BMP is still usually necessary at the end of the day at minimum. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Rake, refresh or wash rock as necessary when space between rocks is inundated with mud. ● Add, extend or replace rock as necessary to achieve performance criteria results. ● Train workforce when BMP improper use is recognized. ● When sediment, rock, or gravel track out occurs due to BMP failure or misuse, debris must be removed from roadways according to the CGP criteria. o Street clean-up operations are separate from this Rock Track Out Pad BMP, but necessary to address unacceptable track out that may occur. PERFORMANCE: ● Slick conditions, slurry, mud chucks, rocks, gravel, water quality risk and driver hazards constitute BMP failure and require immediate sufficient action. ● Light tracking is expected and requires regular maintenance but not usually immediate action. Light tracking is defined as minor residual dirt that can’t be picked up by a square nose shovel. ○ Remove/sweep prior to unsafe and wet conditions or end of workday, whichever is first. REFERENCE: ● CGP 2.2.4, 5.1, 5.2.1 ● CPP 2.4.1 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 57 BMP 28- Wheel Wash APPLICATION ● Use this BMP when vehicles and equipment operations require egress from the project property during wet conditions resulting in sediment track out. ● Wheel washes are a logical redundant option during very wet conditions when other wheel agitation type tire mud management systems are not effective. INSTALLATION/USE PROCEDURE ● Determine the ingress/egress location(s) allowed by the oversight authority and show them on the site plan. ● Do not bypass the wheel wash area when track out prevention is necessary. ● Wash all wheels with a hose or pressure washer provided. Pull forward as necessary to remove all mud from tires and tread. ● Check for rocks wedged in dual tires and remove. ● Identify the necessary retention volume needed for wash waters and attach to this BMP. ● Ensure the workforce is trained regarding track-out BMP requirements. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 58 OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Rake or wash rock as necessary when BMP is not working. ● Remove pond/swale sedimentation at 50% capacity. ● Expand the wash water basin as necessary to contain the retention volume required. ● Do not wash wheels anywhere on site except at the designed wheel wash area that has a retention pond to retain and treat wash waters. ● Train workforce when BMP improper use is recognized. ● When sediment, rock, or gravel track out occurs due to BMP failure or misuse, debris must be removed from roadways according to the CGP criteria. ○ Street clean-up operations are separate from this wheel wash BMP, but necessary to address unacceptable track out that may occur. PERFORMANCE: ● The Wheel Wash BMP is expected to greatly minimize the risk of excessive track out onto roadways and also utilizes sediment deposition in the wash water retention pond. ● Slick conditions, slurry, mud chucks, rocks, gravel, water quality risk and driver hazards constitute BMP failure and require immediate sufficient action. ● Light tracking is expected and requires regular maintenance but not usually immediate action. Light tracking is defined as minor residual dirt that can’t be picked up by a square nose shovel. o Remove/sweep prior to unsafe and wet conditions or end of workday, whichever is first. REFERENCE: ● CGP 2.2.4, 5.1, 5.2.1 ● CPP 2.4.1 BMP 30- Manual Mud Removal ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 59 APPLICATION ● Use this BMP when vehicles and equipment operations require egress from the project property during wet conditions resulting in mud sticking to vehicle tires and tracks. ● Use this BMP when the primary track out BMP is not practical. Use for unusual infrequent situations that are not practical for the primary egress location. ● Use this BMP as a redundant BMP when the primary agitating track out BMP(s) is not working. Usually when some mud is still sticking to tires found when checking for wedged rocks and the effectiveness of agitating tire sediment removal BMP system. ● Use this BMP for short transfer of vehicles for short distances, e.g. across the street. INSTALLATION/USE PROCEDURES ● Stop before exiting the site and use a square nose shovel or stiff broom to remove mud from tires and remove mud tracks when applicable. o When manually removing mud on pavement, shovel and sweep with each track out occurrence and always perform this BMP when incidents are upstream of inlets. ● Check for and remove rocks wedged in dual tires. ● Ensure the workforce is trained regarding mud removal and clean up of trackout BMP requirements. ● Use of Sweeping BMP is still usually necessary at the end of day minimum. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 60 Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● When removing mud from tires or tracks on pavement sweep prior to wet conditions or end of day, whichever comes first. ● Train workforce when BMP improper use is recognized. ● When sediment, rock, or gravel track out occurs due to BMP failure or misuse, debris must be removed from roadways according to the CGP criteria. o Street clean-up operations are separate from this Manual Mud Removal BMP, but necessary to address unacceptable track out that may occur. PERFORMANCE: ● Slick conditions, slurry, mud chucks, rocks, gravel, water quality risk and driver hazards constitute BMP failure and require immediate sufficient action. ● Light tracking is expected and requires regular maintenance but not usually immediate action. Light tracking is defined as minor residual dirt that can’t be picked up by a square nose shovel. o Remove/sweep prior to unsafe and wet conditions or end of workday, whichever is first. REFERENCE: ● CGP 2.2.4, 5.1, 5.2.1 ● CPP 2.4.1 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 61 BMP 31- Track Vehicle Crossing APPLICATION ● Use when track vehicle road crossing for multiple project sites is planned. It is not always practical to remove mud from most tracked construction equipment. Even track washing is usually impractical resulting in follow up clean up as the most practical BMP approach. INSTALLATION/USE PROCEDURES ● When road crossings are short distances, remove clumps with a square nose shovel and broom at each crossing. The clumps will be compacted to the road reducing vacuum sweeper effectiveness. ● When distant crossings are necessary, scraping or track washing BMPs are usually necessary. A machinery bucket blade can also work but follow up with a vacuum operated sweeper is also necessary. ● Protect roadway infrastructure from vehicle tracks. Placing tires beneath tracks is usually effective. Decide the track buffer method and attach your plan to this BMP. ● Ensure the workforce is trained regarding track-out BMP requirements. ● Use of Sweeping BMP is still usually necessary at the end of day minimum. OPERATOR BMP MODIFICATION OR REPLACEMENT ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 62 ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Regular sweeping is usually necessary daily. Shovels are intended to remove the dirt/mud clumps but will not move residual slurry that collects over multiple days. ● Train workforce when BMP improper use is recognized. ● When sediment, rock, or gravel track out occurs due to BMP failure or misuse, debris must be removed from roadways according to the CGP criteria. o Street clean-up operations are separate from this Track Vehicle Crossing BMP, but necessary to address unacceptable track out that may occur. PERFORMANCE ● Slick conditions, slurry, mud chucks, rocks, gravel, water quality risk and driver hazards constitute BMP failure and require immediate sufficient action. ● Light tracking is expected and requires regular maintenance but not usually immediate action. Light tracking is defined as minor residual dirt that can’t be picked up by a square nose shovel. o Remove/sweep prior to unsafe and wet conditions or end of workday, whichever is first. REFERENCE ● CGP 2.2.4, 5.1, 5.2.1 ● CPP 2.4.1 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 63 BMP 32- Street Sweeping APPLICATION ● A Sweeping BMP is necessary to address the immediate safety, water quality and complaint issues that exist resulting from vehicle track out. ● Sweeping BMPs do not eliminate the requirement for egress track out BMPs, but are necessary to compensate for the realistic limitations of most egress track out BMPs. INSTALLATION/USE PROCEDURES ● Use vacuum type sweeping machinery. ● Anticipate end of day sweeping or multiple times a day as needed. The better the egress track out BMP the less sweeping operations are necessary. ● A Square nose shovel and broom are also always a good roadway sediment and debris removal option. ● Identify the sweeper hopper licensed dump location. Attach dump location information to this BMP. ● Ensure the workforce is trained regarding track-out BMP requirements. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Employ sweeping operations at the end of the workday and as necessary. ● Train workforce when BMP improper use is recognized. PERFORMANCE: ● Slick conditions, slurry, mud chucks, rocks, gravel, water quality risk and driver hazards constitute BMP failure and require immediate sufficient action. ● Light tracking is expected and requires regular maintenance but not usually immediate action. Light tracking is defined as minor residual dirt that can’t be picked up by a square nose shovel. o Remove/sweep prior to unsafe and wet conditions or end of workday, whichever is first. REFERENCE: ● CGP 2.2.4, 5.1, 5.2.1 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 64 ● CPP 2.4.1 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 65 BMP 33- Fugitive Dust Control Plan APPLICATION ● Dust control BMPs are necessary when project vehicle operations are accelerating the wind picking up fine sediment particles. ● Dust suppression BMPs are necessary for projects where vegetation is removed increasing the risk of wind picking fine sediment particles. ● Dust suppression BMPs are necessary masonry mixing operations. ● Dust suppression BMPs are necessary for dirt processing operations. ● Per State code 307-309 the Utah Division of Air Quality(UDAQ) a Utah State Fugitive Dust Control Permit(FDCP) is required for all project activities disturbing ¼ acre and for demolition projects. INSTALLATION/USE PROCEDURES ● Attach a copy of the Fugitive Dust Control Plan and the UDAQ permit information ● Attach a copy of the Dust Control Plan Tools and details for suppression, including but not limited to equipment information, methods, and responsible party (in house or subcontracted) ● Attach a list of all dust generating operations, including but not limited to; vehicle traffic, dirt processing, load and haul, brick mason operations, etc. ● Ensure the workforce is trained regarding track-out BMP requirements. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Implement Fugitive Dust Control plan per DAQ permit. ● Train workforce when BMP improper use is recognized. PERFORMANCE: ● UAC section R307-309-5. Typically this means no greater than 10% opacity at property boundaries. ● Any neighbor complaints warrants reevaluation of the effectiveness of the dust control plan and/or an inspection by the oversight authority. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 66 REFERENCE: ● UAC section R307-309-5 ● CGP 2.2.6 ● CPP 2.2.6 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 67 BMP 34 - Vegetation Removal Phasing APPLICATION ● Erosion and dust suppression is necessary for all areas where vegetation is removed. ● Use vegetation removal phasing management to minimize dust and erosion risk. Many large projects can reduce their fugitive dust risk and the extent of expensive dust suppression operations by simply minimizing the site clearing. Phasing vegetation removal can support the FDCP but is not the same as the FDCP dust suppression operations. INSTALLATION/USE PROCEDURES ● Attach a copy of phasing maps showing no disturbance areas for each phase. A vegetated buffer can also be utilized to provide erosion control along the outskirts of the project area. ● Ensure the workforce are informed regarding no disturbance areas. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Train workforce when encroachment into no disturbance areas are found. Update no disturbance maps and document as relevant. ● Address encroachment exposures and add or amend BMPs to compensate for the exposure as necessary. PERFORMANCE: ● Encroachment of no disturbance phasing plan areas constitutes BMP non-compliance. REFERENCE: ● UAC section R307-309-5 ● CGP 2.2.2, 2.2.9, 2.2.6, 7.3.2.f ● CPP 2.2.14 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 68 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 69 BMP 35 - Stabilization Plan APPLICATION ● The project final landscaping plan sheets can satisfy CGP final stabilization requirements when the final landscaping plan includes stabilizing all bare sediment surfaces. This means when the final landscaping plan includes a schedule for permanent impervious, pervious, mulch, and established vegetation surfaces, etc. ● A temporary stabilization plan/BMP is necessary when the project has not reached 70% uniformly vegetated cover and exposed areas during periods of non-construction activity exceed the time limits of the UDAQ permits and CGP requirements. Usually this is 14 days of inactivity but there are practical time frames that can be considered with a stabilization plan BMP and schedule. INSTALLATION/USE PROCEDURES ● Attach a copy of the final landscaping plan, including but not limited to vegetation establishment periods. ● Attach a copy temporary vegetation, including but not limited to temporary seed plan, chemical treatment of erodible surfaces, erosion control blankets, etc, ● Provide a list of all the erosion, operation and fugitive dust BMPs that must remain in place through the final stabilization installation and establishment period. ● Ensure the workforce is informed of the final stabilization BMP requirements. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is expected to submit a site specific final stabilization plan attached to this BMP. This may include: Proprietary system literature, illustrations, any operation procedures and maintenance required to achieve storm water pollution prevention and final stabilization. MAINTENANCE/MANAGEMENT ● Ensure all other containment BMPs are installed, maintained and inspected throughout the installation of the final landscaping infrastructure and vegetation establishment period. ● Train workforce when final stabilization plan and site BMP non-containment is recognized. PERFORMANCE: A Final Stabilization Plan is not effective when any of the following occurs: ● Sediment is or will leave the site for storms less than 2yr event and during wind events. ● A pollutant risk to water quality is present. ● Fugitive dust opacity exceeds DAQ Permit requirements which is usually opacity exceeding 10% at the property boundary. ● Any neighbor complaints warrants an inspection. ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 70 REFERENCE: ● UAC section R307-309-5 ● CGP 2.2.6, 2.2.14, 2.2.14.a, 7.3.5.b ● CPP 2.2.14, 8.2.1 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 71 BMP 36 - Stockpile Management APPLICATION ● Projects where topsoil is stockpiled and reused at a later phase ● Projects where spoil or backfill materials is planned ● Projects with offsite stockpiling ● Stockpile management BMPs are usually necessary when other boundary and FDCP BMPs alone do not adequately contain water and wind erosion resulting from the stockpiled materials. The BMP can include but not limited to: stockpile boundary filters, covers, and locations, etc. INSTALLATION/USE PROCEDURES ● Provide staging/storage area location(s) on the BMP map including additional maps of offsite locations. ● Attach and additional BMP illustrations(boundary and cover BMPs may have many variations including but not limited to: boundary control, cover description etc. Many times this BMP can use other BMP details controls, like silt fence, wattle and showing how they will apply to this detail. ● Ensure the workforce is informed of stockpile management requirements. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 72 ● Ensure the boundary toe control BMPs are installed and maintained against this detail or the attached or referenced details and specifications. ● Ensure the covers are installed and maintained against this detail or the attached or referenced details and specifications. Check for cover and weight placement and for raveling or ripping cover(do not allow the cover raveling and ripping become an additional pollution source). ● Train workforce when non-containment is recognized. PERFORMANCE: A stockpiling BMP is not effective when any of the following occurs: ● Sediment is eroding under or around silt fence and or from underneath the cover. ● In adequate cover and cover material that is raveling and ripping creating an additional pollution source. REFERENCE: ● CGP 2.2.8 7.3.3 ● CPP 2.2.5, 7.3.3, 2.2.14 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 73 BMP 37 - Construction Dewatering Retention APPLICATION ● Project where waterline system commissioning is necessary ● A DEQ Dewatering permit is not required when full retention is allowed and achieved onsite. Note, groundwater dewatering operations usually do not qualify for a DEQ Dewatering Permit waiver. The exposure period and amount of groundwater results in uncertain and unrealistic volume calculations. INSTALLATION/USE PROCEDURES ● Provide a retention location on BMP map. ● Provide a simple detail of retention pond and operation volume necessary for full retention of anticipated dewatering volume. Attached copy of volume calculations to this BMP. ● Ensure the workforce is informed of the CGP dewatering BMP requirements. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Inspect following dewatering operation and ensure volume exists for any subsequent dewatering operations. ● Train workforce when non-containment is recognized. PERFORMANCE: ● Any uncontained dewatering volume constitutes BMP failure. REFERENCE: ● CGP 1.2.2, 1.2.4, 2.3.7, 7.3.4 ● CPP 1.2.4, 2.2.7 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 74 BMP 39 - Construction Dewatering DEQ Permit Required APPLICATION ● Projects where groundwater is anticipated or other dewatering operation volumes would exceed available space for onsite retention. ● Project where pressure system and waterline commissioning is necessary ● Projects where groundwater dewatering operations are anticipated. OPERATION PROCEDURE ● Provide dewatering operation location(s) on BMP map. ● Attach a copy of the DEQ Dewatering Permit to this BMP. ● Attach a copy of all permit required inspection, monitoring requirements, operator prepared BMPs or proprietary systems and chemical treatment methods. ● Ensure the workforce is informed of the DEQ permit dewatering BMP requirements. OPERATOR BMP MODIFICATION OR REPLACEMENT ● Operator is invited to propose an alternative BMP or modify this preferred BMP. The proposed BMP must match or exceed performance requirements as this preferred BMP. Any deviations from this preferred BMP must be reviewed and accepted by the oversight authority. ● Submit BMP modifications or replacements to the oversight authority for review; including but not limited to; Proprietary system literature, modified illustrations, any operation procedures and maintenance adjustments, etc. MAINTENANCE/MANAGEMENT ● Ensure proprietary system, inspection, monitoring maintenance and application methods are followed. ● Train workforce when non-containment is recognized. PERFORMANCE: ● Any uncontained dewatering volume constitutes BMP failure. ● Any DEQ Dewatering Permit non-compliance. REFERENCE: ● CGP 1.2.2, 1.2.4, 2.3.7, 7.3.4 ● CPP 2.2.3 ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 75 BMP 40 - Spill Control Plan APPLICATION ● Most projects are susceptible to spill risk and therefore have a need for spill containment and clean up operations CGP REQUIREMENT ● Per (CGP Part 7.3.5.b and 2.3.6): ― Describe the spill prevention and control plan. Include ways to reduce the chance of spills, stop the source of spills, contain and clean up spills, dispose of materials contaminated by spills, and train personnel responsible for spill prevention and control. ― Some projects/site may be required to develop a Spill Prevention Control and Countermeasure (SPCC) plan under a separate regulatory program (40 CFR 112). If you are required to develop an SPCC plan, or you already have one, you should include references to the relevant requirements from your plan. ― The plan must include the materials and method of containment and for flowing liquid, cleanup, disposal and follow the minimum spill controls below. For more information, see EPA Guide, Chapter 5, P2 Principle 6. ● Any discharges in 24 hours equal to or in excess of the reportable quantities listed in 40 CFR 117, 40 CFR 110, and 40 CFR 302 will be reported to the National Response Center and the Division of Water Quality (DWQ) as soon as practical after knowledge of the spill is known to the permittees. The permittee shall submit within 7 calendar days of knowledge of the release a written description of: the release (including the type and estimate of the amount of material released), the date that such release occurred, the circumstances leading to the release, and measures taken and/or planned to be taken to the Division of Water Quality (DWQ), 288 North 1460 West, P.O. Box 144870, Salt Lake City, Utah 84114- 4870. The Storm Water Pollution Prevention Plan must be modified within 14 calendar days of knowledge of the release to provide a description of the release, the circumstances leading to the release, and the date of the release. In addition, the plan must be reviewed to identify measures to prevent the recurrence of such releases and to respond to such releases, and the plan must be modified where appropriate. Agency Phone Number ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 76 National Response Center (800) 424-8802 Division of Water Quality (DWQ) 24-Hr Reporting (801)-231-1769 (801) 536-4123 Utah Department of Health Emergency Response (801) 580-6681 Material Media Released To Reportable Quantity Engine oil, fuel, hydraulic & brake fluid Land 25 gallons Paints, solvents, thinners Land 100 lbs (13 gallons) Engine oil, fuel, hydraulic & brake fluid Water Visible Sheen Antifreeze, battery acid, gasoline, engine degreasers Air, Land, Water 100 lbs (13 gallons) Refrigerant Air 1 lb OPERATION PROCEDURE ● Provide spill kit location(s) on BMP map. ● Attach of list of potential spill sources and identify the responsible person if different than the applicant. ● Per the source list, anticipate the spill risk and provide a spill plan equal to the risk. Attach copy of spill kit contents. Both proprietary material containment ---PAGE BREAK--- MS4 Preferred Best Management Practices (BMPs) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 77 and clean up materials and or self provided, dirt, sand and a means of implementation can be sufficient. ● Provide both flow containment and clean up materials. Attach a list of materials and any specific instruction for the workforce. ● Attach any proprietary system instruction or company wide specific spill management and SPCC ● Report spills. A reported spill is not a violation but unfortunately the applicant must be responsible for all damage restoration and cost. ● Train workforce MAINTENANCE/MANAGEMENT ● Inspect spill kit contents and its location against your attachments and site BMP map. Ensure spill kit materials are in good condition and in quantity to meet site specific spill risks. ● Evaluate spill incidents and train workforce as necessary. Document incident details PERFORMANCE: The following are spill plan concerns. ● Uncontained spills that could have been prevented. ● Contained spills that are not cleaned up the same day or prior to wet conditions whichever is first. ● Unreported spills. ● Any non-rectified spill damage REFERENCE: ● CGP 7.3.5.b(7), 2.3.6 ● CPP 2.8.3 ---PAGE BREAK--- How to Apply for a Construction General Permit (CGP) or Common Plan Permit (CPP) and Pre-construction Checklist Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 78 How to Apply for CGP or CPP: Please proceed to the State of Utah DEQ General Construction: UPDES Permits site: storm-water-updes-permits ---PAGE BREAK--- How to Apply for a Construction General Permit (CGP) or Common Plan Permit (CPP) and Pre-construction Checklist Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 79 Evaluation Checklist For a physical/PDF copy, contact Aaron Roberts. ---PAGE BREAK--- How to Apply for a Construction General Permit (CGP) or Common Plan Permit (CPP) and Pre-construction Checklist Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 80 ---PAGE BREAK--- How to Apply for a Construction General Permit (CGP) or Common Plan Permit (CPP) and Pre-construction Checklist Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 81 ---PAGE BREAK--- Construction Inspection and Enforcement SOPs Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 82 Standard Operating Procedure for MS4 Construction Oversight Inspections of Permitted Construction Sites SOP Last Reviewed: November 12, 2024 Introduction This SOP was written for Utah MS4s to help them meet the requirements of their MS4 Permit and to provide guidance to abide by Utah Code 19-5-108.3. This SOP references the Construction Site Storm Water Runoff Control (4.2.4) section of the MS4 Permit. The overarching goal of this SOP is to standardize storm water construction program practices across all MS4s in the State of Utah. From Utah Code 19-5-108.3: “A municipal system shall conduct an oversight inspection1 through an electronic site inspection2. A municipal system may conduct an on-site inspection if the municipal system has a documented reason for justifying an on-site oversight inspection.” To differentiate between the two types of oversight inspections, the terms “onsite oversight” and “electronic oversight” inspection are used. ● “Onsite oversight inspection” is an inspection in which MS4 staff physically visit a construction site to perform an inspection as has been done historically. ● “Electronic oversight inspection” is an offsite inspection of the operator's submitted electronic site inspection report. Each of these types of oversight inspections will be described in the During Construction portion within the Process section of this SOP. 1. Purpose: The purpose of this SOP is to describe how all MS4s will conduct inspections for construction sites that require storm water pollution control measures. For purposes of this SOP, “operator” means the person responsible for the Storm Water Pollution Prevention Plan implementation on an applicable construction site. 2. Responsibilities: 1 “Oversight inspection” means a construction site inspection performed by the municipal system to assess compliance with the permit. (Utah Code 19-5-108.3(1)(g)) 2 “Electronic site inspection” means geo-located and time-stamped photos taken, evaluated, and submitted electronically by the applicant to the municipal system. (Utah Code 19-5-108.3(1)(e)) ---PAGE BREAK--- Construction Inspection and Enforcement SOPs Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 83 Each MS4’s storm water staff are responsible for implementing the requirements and may not defer from this SOP. The operator is responsible for abiding by all requirements of the UPDES Storm Water General Permit or Common Plan Permits for Construction Activities and the MS4 is responsible for oversight. ● The position responsible for oversight inspections is the Stormwater Operations Manager. ● The position(s) who has authority to implement enforcement procedures is Stormwater Operations Manager as well as the Division of Water Quality (DWQ). This SOP is to be followed and updated according to State and municipal requirements. 3. MS4 Permit Requirements: 1. Oversight Inspection a. Required to be completed by the MS4 on any construction site that is greater than or equal to one acre or is part of a common plan of development or sale which collectively disturbs land greater than or equal to one acre. b. MS4 must inspect all phases of construction, including prior to land disturbance, during active construction, and following active construction. c. Oversight inspections are required to be completed for non- priority construction sites and biweekly for priority construction sites. 2. Qualified Personnel a. The oversight inspection must be performed by a “qualified person” as described in the DWQ MS4 Permit. b. Anyone having a job duty related to implementing the construction storm water program must receive annual training. New hires must be trained within 60 days of hire. 3. Record Retention a. All MS4s must maintain records for at least five years of all applicable construction project documents which could include: i. Site plan reviews ii. iii. Inspections iv. Enforcement Actions (notices of violation, stop work orders) 4. Process: 1. Pre-construction a. The MS4 will perform a pre-construction review and meeting which at minimum will include: ---PAGE BREAK--- Construction Inspection and Enforcement SOPs Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 84 i. A review of the site design ii. Planned operations at the construction site iii. Planned Best Management Practice(s) (BMPs) during the construction phase iv. Planned long-term storm water run-off BMPs v. Documentation: 1. Review Checklist: Document the Review Checklist through Millcreek’s M:Drive 2. Pre-construction Meeting: Document the meeting within Millcreek’s M:Drivev b. The MS4 will determine whether the construction site will be identified as priority and receive bi-weekly MS4 oversight inspections. c. The MS4 must provide the operator the procedure for notifying the MS4 of their completion of active construction. d. The MS4 will perform a pre-construction electronic oversight inspection or onsite oversight inspection with the operator(s). i. This pre-construction inspection must occur before land disturbance and will verify that the operator has placed all site specific construction BMPs prescribed by the ii. Documentation: 1. Pre-construction inspection: Document the inspection through Utilisync. e. The operator will submit a Notice of Intent (NOI) through the NeT NPDES eReporting Tool online (NeT) before earth disturbing activities. 2. During Construction a. Electronic Oversight Inspection i. The MS4 will perform their required electronic oversight inspections (at the intervals mentioned in 2.1.c) through access to the Operator's and electronic site inspection(s). 1. The operator’s report must use geo-located and time- stamped photos of all BMPs implemented at the construction site. 2. All photos must be sufficient to depict that the BMP(s) is meeting its proper function to eliminate or control pollutants on site. 3. The operator’s report should show compliance with the Construction General Permit (CGP), Common Plan Permit (CPP) if applicable, and the site specific ---PAGE BREAK--- Construction Inspection and Enforcement SOPs Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 85 a. This includes all documentation regarding corrections taken as a result of the operator’s self inspection. b. Onsite Oversight Inspection i. An onsite oversight inspection may be warranted under the following conditions: 1. Compliance with the CGP, CPP if applicable, and site specific cannot be reasonably determined during an electronic oversight inspection. 2. A perceived or reported threat to water quality that is immediate3 and/or imminent4. Or a reported complaint. 3. Failure to install BMPs prior to land disturbance. 4. Illicit discharge, unknown/unidentified non-storm water discharge, or prohibited discharge per CGP/CPP permits. 5. The operator requests that oversight inspections be performed onsite. 6. Any other oversight inspection step listed below that cannot be fulfilled. c. An oversight inspection, both electronic and onsite, is performed by following these steps: 1. Review the 2. Review the signage for compliance with the CGP or CPP a. Placed in a safe, conspicuous, and publicly accessible location near the entrance b. Includes UPDES permit tracking number, contact information, and method of access 3. Review the operator self inspection reports 4. Review the entire perimeter and any downgradient areas 5. Review points of vehicle/equipment exit 6. Review any discharge points (keep in mind that these are not always piped inlets) 3 Immediate Threat: A situation where pollutant discharge to state waters is already occurring or is inevitable without urgent corrective action. This refers to a present and active risk that requires immediate attention to prevent or mitigate further contamination. 4 Imminent Threat: A situation that poses a high likelihood of pollutant discharge to state waters in the near future if corrective actions are not taken. This refers to conditions that suggest a serious risk is developing but has not yet resulted in an actual discharge. ---PAGE BREAK--- Construction Inspection and Enforcement SOPs Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 86 7. Review all BMPs installed to mitigate or prevent sediment, erosion, and pollution 8. Review all stabilizing areas (especially steep slopes) 9. Review all pollutant generating activities such as fueling areas, washout areas, etc. 10. Observe all discharges (if prohibited or unauthorized this is an immediate and/or imminent threat to water quality) 11. Observe all conditions that could result in polluted storm water discharge (including sediment in the street/gutter) 12. Determine if any additional sediment, erosion, and/or pollution prevention controls are needed 13. Verify that all above activities are accounted for and updated in the site's and Map 14. Any deficiencies must be noted in the oversight inspection form d. For oversight inspections, MS4 staff must use the Oversight Construction Inspection Form provided by the Division of Water Quality. i. MS4 staff sends a copy of the oversight inspection to the operator. ii. MS4 staff maintains record of all oversight inspections through Utilisync. e. If the storm water BMPs on a construction site are found to be deficient by the MS4 inspector, steps will be taken to address the deficiencies as outlined in the Enforcement for Construction Sites SOP. i. Violations could include: 1. Failure to maintain BMPs 2. Failure to install BMPs 3. An illicit discharge 4. Failure to conduct inspections 5. Failure to update 6. Any other CGP and/or CPP requirements that are deficient 3. After Construction a. The operator will request through NeT, a Notice of Termination (NOT) once these conditions have been met: i. All temporary storm water control measures have been removed ii. The site has achieved final stabilization iii. All construction materials, waste, and equipment have been removed ---PAGE BREAK--- Construction Inspection and Enforcement SOPs Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 87 iv. All potential pollutants and pollution-generating activities have been removed b. MS4 staff who have ‘MS4 Authority’ will be notified of the request to approve the operator’s NOT via an email notification from NeT. c. MS4 staff will verify through an electronic oversight inspection (or on-site oversight inspection if applicable described in the Enforcement for Construction Sites SOP) if all NOT requirements have been met and approve or deny the NOT submission via NeT. d. MS4 staff will document the NOT inspection through the State’s Storm Water NOT Inspection Form and maintain a record of it through Utilisync and Millcreek’s M:Drive. e. All documents related to each applicable construction site must be retained for five years or until construction is completed, whichever is longer. ---PAGE BREAK--- Construction Inspection and Enforcement SOPs Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 88 Standard Operating Procedure for MS4 Construction Oversight Enforcement for Construction Sites SOP Last Reviewed: November 12, 2024 Introduction This SOP was written for Utah MS4s to help them meet the requirements of their MS4 Permit and to provide guidance to abide by Utah Code 19-5-108.3. This SOP references the Construction Site Storm Water Runoff Control (4.2.4) section of the MS4 Permit. The overarching goal of this SOP is to standardize storm water construction program practices across all MS4s in the State of Utah. From Utah Code 19-5-108.3: “A municipal system may conduct an on-site inspection if the municipal system has a documented reason for justifying an on-site oversight inspection.” (Utah Code 19-5- 108.3(15)) “Violation” means a failure to implement or maintain preferred best management practices. (Utah Code 19-5-108.3(1)(k)) 1. Purpose: The purpose of this SOP is to describe how MS4s will implement standards from the MS4 Permit in conjunction with Utah State Code 19-5-108.3 in regard to sites that do not comply with their and state issued Construction General Permit (CGP) or Common Plan Permit (CPP) if applicable. For purposes of this SOP, “operator” means the person responsible for implementation on an applicable construction site. 2. Responsibilities: Each MS4’s storm water staff are responsible for implementing the requirements and may not defer from this SOP. The operator is responsible for abiding by all requirements of the UPDES Storm Water General Permit or Common Plan Permits for Construction Activities and the MS4 is responsible for oversight. ● The position responsible for oversight inspections is the Stormwater Operations Manager. ● The position(s) who has authority to implement enforcement procedures is Stormwater Operations Manager, as well as the Division of Water Quality (DWQ). ---PAGE BREAK--- Construction Inspection and Enforcement SOPs Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 89 This SOP is to be followed and updated according to State and municipal requirements. 3. MS4 Permit Requirements: 1. Enforcement procedures and regulatory authority must be written and documented in the SWMP of each MS4. a. The procedures of this SOP should be summarized or referenced in the MS4’s SWMP which is accessible by the public. Regulatory authority is described in the Inspections of Permitted Construction Sites SOP. 2. Each MS4 staff with responsibility over the program must be trained in proper documentation of inspections, follow-up, and enforcement actions. a. Documentation of routine maintenance, corrective action, follow-up inspections, and enforcement actions should all be included with the Oversight Construction Inspection Form provided by the DWQ. i. Any communication between the operator and the MS4 should be recorded and retained through Utilisync and Millcreek’s M:Drive. ii. Verbal communication alone is not advised. If important communication does occur verbally (such as agreement on BMP improvement, corrective action deadline, etc) between the operator and the MS4, restating the conversation afterwards via email to the operator is advised so that a record can be retained. 4. Process: 1. Oversight Inspections a. If violations of the CGP/CPP permit are determined after conducting an inspection (electronic or onsite) as identified in the Oversight Inspections SOP, the MS4 must document each violation on the Oversight Construction Inspection Form provided by DWQ as identified in the next step. If the inspection was conducted onsite, justification for an onsite oversight inspection must be documented on the inspection form. 2. Violation and Follow-up Procedures a. First Notice of Violation (NOV 1) i. The MS4 must notify the operator of the violation in writing on the Oversight Construction Inspection Form. The violation notation at minimum must include: 1. Explanation/Identification of each violation 2. Associated citation from the CGP/CPP 3. Deadline to correct each violation. a. The deadline to correct violations should be no sooner than 24 hours (immediate threats to water ---PAGE BREAK--- Construction Inspection and Enforcement SOPs Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 90 quality), and no later than 7 days (imminent threats to water quality). ii. Reinspection 1. The MS4 should perform a follow-up electronic oversight inspection to verify that each violation has been corrected after the deadline given by the MS4. a. If the follow up electronic inspection report submitted by the operator is not sufficient for MS4 staff to determine that the violation has been corrected, an onsite oversight inspection may be conducted. If the inspection was conducted onsite, justification for an onsite oversight inspection must be documented on the inspection form. 2. If the operator has not corrected the violation(s), the MS4 will notify the operator that the violation hasn’t been corrected in writing as described in the next step. b. Second Notice of Violation (NOV 2) i. The MS4 must notify the operator of the violation in writing on the Construction Oversight Inspection Form. The violation notation at minimum must include: 1. Explanation/Identification of each remaining violation 2. Associated citation from the CGP/CPP 3. Deadline to correct each violation. a. The deadline to correct violations should be no sooner than 24 hrs (immediate threats to water quality), and no later than 7 days (imminent threats to water quality). 4. Written warning that a stop work order can be issued if the violation is not corrected within the new time period specified by the MS4. (at minimum, another 24 hours) ii. Reinspection 1. The MS4 should perform a follow-up electronic oversight inspection to verify that each violation has been corrected after the deadline within the time period given by the MS4. a. If the follow up electronic inspection report submitted by the operator is not sufficient for MS4 staff to determine that the violation has been corrected, an onsite oversight inspection may be ---PAGE BREAK--- Construction Inspection and Enforcement SOPs Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 91 conducted. If the inspection was conducted onsite, justification for an onsite oversight inspection must be documented on the inspection form. 2. If the operator has not corrected the violation(s), the MS4 will notify the operator that the violation hasn’t been corrected in writing as described in the next step. c. Third Notice of Violation (NOV 3) i. The MS4 may issue a stop work order until the MS4 performs an oversight inspection to verify that the violation has been corrected or the operator shows the violation has been corrected through an electronic site inspection report. d. Documentation: i. The results of all enforcement notices, communications, and inspections (including follow-up or reinspections) must be documented through Utilisync. 3. Special Cases a. The MS4 can issue a stop work order earlier than in the process described above if the MS4 can document that the violation imposes an immediate5 and/or imminent6 threat to water quality. b. The MS4 can correct a violation for the operator, and recoup the costs associated, if the operator refuses to correct the violation and there is imminent significant harm to water quality or the stormwater system. c. The MS4 cannot issue a stop work order if the violation is a result of a properly installed and maintained BMP per specifications from the preferred BMP list. d. MS4s are not allowed to issue fines related to oversight of construction sites. 5. Communication: Each MS4 will utilize a method of communication for enforcement (such as a notice of violation, stop work orders) to the operator. ● The method used for this MS4 is Utilisync as well as follow-up emails. 5 Immediate Threat: A situation where pollutant discharge to state waters is already occurring or is inevitable without urgent corrective action. This refers to a present and active risk that requires immediate attention to prevent or mitigate further contamination. 6 Imminent Threat: A situation that poses a high likelihood of pollutant discharge to state waters in the near future if corrective actions are not taken. This refers to conditions that suggest a serious risk is developing but has not yet resulted in an actual discharge. ---PAGE BREAK--- Construction Inspection and Enforcement SOPs Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 92 6. Flow Chart attached. ---PAGE BREAK--- Stormwater Inspection Forms Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 93 Stormwater Inspection Forms For a physical/PDF copy, contact Aaron Roberts. ---PAGE BREAK--- Stormwater Inspection Forms Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 94 ---PAGE BREAK--- Stormwater Inspection Forms Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 95 ---PAGE BREAK--- Construction General Permit (CGP) and Common Plan Permit (CPP) Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 96 Please proceed to the State of Utah DEQ, Storm Water Permits page: ---PAGE BREAK--- Website Links for Other Stormwater Organizations and Stormwater Information Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 97 Salt Lake County Stormwater Coalition: Utah Stormwater Advisory Committee advisory-committee/ ---PAGE BREAK--- MS4 Stormwater Management Plan Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 98 Millcreek Stormwater Management Plan: ---PAGE BREAK--- MS4 Long-term Stormwater Management Program Details Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 99 Millcreek Long-term Stormwater Management Plan ---PAGE BREAK--- IDDE Program and Hotline Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 100 Millcreek Illicit Discharge Detection and Elimination ---PAGE BREAK--- MS4 Stormwater Educational Material Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 101 See Salt Lake County Stormwater Coalition: ---PAGE BREAK--- MS4 Stormwater Permit Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 102 Utah DEQ Website for Millcreek MS4 Permit: public.deq.utah.gov/WebLink/DocView.aspx?id=10718&eqdoc s=DWQ-2023-003215 ---PAGE BREAK--- MS4 Stormwater Annual Report Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 103 ---PAGE BREAK--- MS4 Stormwater Annual Report Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 104 ---PAGE BREAK--- MS4 Stormwater Annual Report Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 105 ---PAGE BREAK--- MS4 Stormwater Annual Report Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 106 ---PAGE BREAK--- MS4 Stormwater Annual Report Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 107 ---PAGE BREAK--- MS4 Stormwater Annual Report Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 108 ---PAGE BREAK--- MS4 Stormwater Annual Report Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 109 ---PAGE BREAK--- MS4 Stormwater Annual Report Millcreek Stormwater Information USWAC MS4 Stormwater Information Standardization Template 2024-10-23 110