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The City of Redmond Stormwater Management Program (SWMP) Plan Prepared by Peter Holte City of Redmond Department of Public Works May 17, 2018 ---PAGE BREAK--- ---PAGE BREAK--- 1 2018 City of Redmond SWMP INTRODUCTION General Information about this Document This document is the City of Redmond’s Stormwater Management Program (SWMP) Plan. It has been created to comply with requirements found in the Western Washington Phase II Municipal Stormwater Permit (NPDES Permit), which is part of the Federal Clean Water Act. The NPDES Permit requires that the City of Redmond produce a Stormwater Management Program Plan (SWMP Plan), and update it regularly, to reflect Redmond’s actions and planned actions in meeting NPDES permit requirements. The first NPDES Permit was issued to the City of Redmond by the State of Washington Department of Ecology in 2007 and revised in 2009. A new, one-year permit was issued to the City of Redmond on August 1, 2012. The 2012 re-issued permit extends the terms and conditions for the previously issued 2007 – 2012 NPDES permit for a period spanning between August 1, 2012 to July 31, 2013. A new, NPDES Permit took effect on August 1, 2013 will stay in effect until July 31, 2019. (The original expiration date of current permit was July 31, 2018. The Washington State Department of Ecology extended the permit for one year.) This document is organized into six chapters. Excluding this introduction section, these chapters are: 1) Education and Outreach, 2) Public Involvement and Participation, 3) Illicit Discharge Detection and Elimination, 4) Controlling Runoff from Development and Redevelopment projects, 5) Municipal Operations and Maintenance, and 6) Monitoring and Assessment. The chapters align with the manner in which the permit is organized. Specific requirements are identified using the permit’s citation methodology (i.e. provision: S5.C.3.b). The entire permit can be viewed by going to the Washington Department of Ecology website or clicking on the following hyperlink: The City’s SWMP Plan aims to reduce the discharge of pollutants into receiving waters by polluted stormwater runoff to the maximum extent practicable (MEP), applying all known and reasonable technologies (AKART). These goals will be accomplished by the implementation of all action detailed within this SWMP Plan, and through action taken by the City that are not required by the NPDES permit and thus not detailed in this Plan. In some cases, the City intentionally exceeds some NPDES Permit requirements to keep our lake, river, and streams safe for human contact and to sustain aquatic ecosystems/species. ---PAGE BREAK--- 2 2018 City of Redmond SWMP PUBLIC EDUCATION AND OUTREACH The City of Redmond’s Environmental & Utility Services Division of Public Works provides and participates in a variety of education and outreach efforts focused on environmental stewardship, including stormwater management. S5.C.1.a.i and ii Targeted Stormwater Outreach In 2018, the City of Redmond will take the following actions to provide targeted stormwater-related outreach programs to the public: 1. Continue to coordinate with other permitted jurisdictions in Western Washington through organizations such as the Stormwater Outreach for Regional Municipalities (STORM) and the North King County Stormwater Outreach Group (The SOGgies). In 2018, the City is contributing funds into STORM’s efforts to air cable TV stormwater awareness ads known as the “Certain Things Don't Mix” campaign. 2. Continue to provide classroom environmental educational programs to schools in Redmond via a partnership with the Cascade Water Alliance and/or the environmental education non-profit organization, Nature Vision. S5.C.1.b Creating Stewardship Opportunities In 2018, the City will provide stewardship opportunities via the Green Redmond Partnership, a volunteer stewardship program in partnership with the non-profit land conservation organization, Forterra. The City’s Environmental and Utility Services Division may support additional stewardship events. S5.C.1.c Measuring Outreach Effectiveness For a number of years, the City hired a consultant to conduct Charity Carwash Program drive-through (windshield) monitoring in Redmond six weekends a year and provide outreach at the junior and senior high schools. In 2016, as required by the NPDES permit, Redmond used information gathered by this consultant, and similar programs in neighboring jurisdictions to evaluate the effectiveness of this program. This analysis revealed that awareness of issues related to car washing are increasing, and that catch basin inserts the City has provided are problematic for a number of technical and logistical reasons. In 2017, based on this evaluation, the City has determined that the program should phase-out loaning the charity car washing kit program, as the program appears to have achieved its goal. School and youth groups are longer using car washing for fundraising, but are looking to alternative methods to support their organizations. Sunsetting this program provides Redmond with an opportunity to address other stormwater outreach needs. ---PAGE BREAK--- 3 2018 City of Redmond SWMP PUBLIC INVOLVEMENT AND PARTICIPATION The City of Redmond is committed to ongoing opportunities for public input into the development of this plan and for public input into initiatives designed to improve water quality. S5.C.2.a and S5.C.2.b Involving the Public in the SWMP In 2017, the City invited the public to review and comment on the City’s Stormwater Management Program Plan (SWMP Plan) via an advertisement on the City’s web home page. The City welcomes comments from the public at any time throughout the year, and provides a contact number for residents to call with questions throughout the year from the City’s SWMP webpage: http://www.redmond.gov/Environment/StormwaterUtility/NPDES/. In 2018, the City will again invite public input using the same means detailed above. In addition, the City involves the public in our stormwater management related decisions by engaging people during the planning and construction of stormwater infrastructure projects, and during development of stormwater-related policy. ---PAGE BREAK--- 4 2018 City of Redmond SWMP ILLICIT DISCHARGE DETECTION AND ELIMINATION The Illicit Discharge Detection and Elimination (IDDE) program is designed to prevent contamination of groundwater and surface water by monitoring, tracking, and removing non-stormwater discharges into the stormwater drainage system. S5.C.3.a Municipal Stormwater Drainage System Map In 2018, the City will continue to maintain an up-to date stormwater conveyance map in an enterprise geospatial database. Updating and managing geospatial data is done according to documented procedures and quality control standards. Global information system (GIS) data includes attributes that describe ownership, water quality facility design details, flow control facility design details, conveyance design information, and spatial data. GIS data is managed with ESRI software and database management system solutions. Both private and public stormwater system data is managed geospatially. The GIS stormwater data includes all nominal diameter pipes, not just 24 inch or larger. Land use and drainage area delineations for each outfall have been developed and are updated regularly. S5.C.3.b Water Pollution Prevention Ordinance/Municipal Code 13.06 The City of Redmond Municipal Code 13.06 authorizes the IDDE program and meets the requirements specified in the NPDES. In the vast majority of cases, the City works to enforce this code by using education and technical assistance to seek voluntary compliance. The City will escalate its response as necessary to ensure compliance; first by supplying violators with a warning letter that clearly details what is needed to comply with Municipal Code 13.06 and the consequences of refusal to comply. If further actions are needed, the City has the power to bring violators before the City’s hearing examiner. S.5.C.3.c Ongoing IDDE Program to detect non-stormwater discharges and Illicit Connections The City is required to screen 12% (on average) of the City’s stormwater system for illicit connections each year. In 2014, City’s stormwater maintenance crew began using required stormwater facility inspections as an opportunity to conduct visual inspection procedures for signs of illicit connections. This visual inspection protocol is noted as an acceptable screening practice in Illicit Discharge Detection and Elimination: A Guidance Manual for Program Development and Technical Assessment, Center for Watershed Protection, October 2004. These inspections are recorded as part of the Stormwater Crew’s catch basin inspection records. The stormwater crew will notify the City’s IDDE coordinator if potential pollution issues are identified. A portion of the required 12% screenings may also be fulfilled by using a camera cart to video sections of the City’s stormwater system. This method is also identified as an acceptable screening practice in the document noted in the previous paragraph. The percentage of this requirement that will be fulfilled by this requirement has not yet been determined. ---PAGE BREAK--- 5 2018 City of Redmond SWMP S.5.C.3.d Implement an ongoing program designed to address illicit discharges The City currently has an ongoing, fully funded, IDDE program. The City responds to and investigates, calls regarding environmental concerns such as illegal dumping, spills, illicit discharges, and illicit connections. Documentation of IDDE procedures are detailed in the City’s Illicit Discharge Detection and Elimination (IDDE) Program Manual: City Policies and Procedures (2011). The City operates a telephone hotline that allows citizens to report illicit discharges or illicit dumping within city limits: (425)556-2868. The hotline is covered 24 hours a day, seven days a week. During regular business hours, calls are received and followed up on by the Environmental & Utility Services Division of Public Works. Off hour calls are managed by Redmond’s police dispatch and standby maintenance crew. The hotline has been publicized by the City’s website, magnets distributed at community events, Redmond’s television channel (RCTV), and most outreach materials created by the City typically include the hotline number. All calls are tracked and followed up on. Additionally, targeted outreach materials have been developed and deployed to the public for restaurant related non stormwater discharges, power washing and car washing, general awareness of stormwater, and prohibited discharges. In 2018, these activities will continue. S.5.C.3.e IDDE Staff Training Scott McQuary, the City of Redmond Pollution Prevention Program Administrator (including IDDE program) and Joe Capis, Private Drainage Inspector, attended King County’s IC/IDDE training to comply with Section S5.C.3.f.i of the Phase II Municipal Stormwater Permit in 2009. In 2018, IDDE staff will look for and participate in opportunities to remain up-to-date on new spill response and illicit discharge detection procedures by participating in webinars, training workshops, conferences and other capacity building activities, if and when such activities become available. S.5.C.3.f Program Recordkeeping The City currently tracks each type of IDDE incidence that rises to the level of a G3 notification. Records include a copy of the G3 notification, the City’s response to the incident, the timing of the response and how those incidences are resolved. As previously mentioned, the City also maintains records of visual inspections of catch basins and other stormwater facilities to meet the 12% screening requirement. ---PAGE BREAK--- 6 2018 City of Redmond SWMP CONTROLLING RUNOFF FROM NEW DEVELOPMENT, REDEVELOPMENT AND CONSTRUCTION SITES How development and redevelopment occur within Redmond can have a significant impact on the health of City’s waterways. The City reviews development plans, inspects development sites during construction, and monitors private stormwater system infrastructure every two years to ensure facilities are maintained. In addition, the City requires the use of Low Impact Development (LID) stormwater management practices and principles as required by the NPDES permit. S5.C.4.a Apply Stormwater Management Standards to Development, Redevelopment, and Construction Sites Redmond Municipal Code (RMC) 15.24 codifies stormwater management in Redmond, and includes code for construction, and stormwater infrastructure design. RMC 15.24 authorizes the City to enforce provisions required in permit, and the minimum requirements in the permit’s Appendix 1. The City’s Stormwater Technical Notebook details the required construction practices and standards for new or retrofitted development projects. The revised Notebook is based with the Department of Ecology’s 2012 Stormwater Management Manual for Western Washington as amended in 2014, and requires actions that are as or more protective than the provisions detailed in the In meeting the Appendix 1 Minimum Requirement the City has chosen to allow developers the use of pervious pavements or a functional equivalent designed to provide the same rate of stormwater infiltration. The City requires that development projects wishing to use this functionally equivalent design supply additional hydrologic modeling-based justification detailing equivalency. This approach is allowed by provisions in the regarding demonstrated equivalency, and affirmed by guidance from the Washington Department of Ecology on this topic. The City details for design and required additional modeling actions are documented within a third-party peer reviewed Technical Memo, “Permeable Pavement: Functionally Equivalent Design” drafted by City stormwater engineers. In the Downtown Redmond and the Overlake Neighborhood, the City will use regional facilities to meet Minimum Requirement On-site Stormwater Management and Minimum Requirement Runoff Treatment in the permit’s Appendix 1. In 2015, a regional stormwater vault in the Overlake Neighborhood, and a regional water quality treatment facility in Downtown Redmond will be fully operational. More information regarding Redmond’s use of regional facilities, including a copy of Ecology’s Letter of Support for this approach, is available on the City’s website: http://www.redmond.gov/Environment/StormwaterUtility/RegionalFacilities. Section 7 of Appendix 1 allows permittees to seek approval from Ecology to tailor certain development and redevelopment stormwater requirements. The City used ---PAGE BREAK--- 7 2018 City of Redmond SWMP this provision to gain approval for an alternative method of achieving compliance with Minimum Requirement Runoff Treatment and Minimum Requirement Flow Control in permit’s Appendix 1. The City of Redmond Watershed Management Plan provides the details of this alternative approach. For 2018, the City continues to implement this Watershed Management Plan. In the Monticello Creek Watershed, the City is conducting a street sweeping pilot project to evaluate how this activity may reduce polluted stormwater runoff and improve water quality in nearby streams. More information regarding the Watershed Plan, including Ecology’s Letter of Approval for this approach, is available on the City’s website: ed Management. S5.C.4.b Review and Inspect Development/Redevelopment Projects The City has a permitting process with civil/site plan review and approval process, inspection, and enforcement to meet standards established by S5.C.4b for all new and redeveloped sites that meet the thresholds details in Appendix 1 of the NPDES permit (see Figures 3.2 and 3.3. on pages 9 and 10 of Appendix This oversight occurs in phases: prior to construction during the plan acceptance process, before the site is cleared during an initial site construction best management practices (BMP) implementation inspection, during construction via construction site inspections, and post construction as part of the stormwater infrastructure acceptance inspection. Plans are reviewed by licensed engineers or qualified engineering firms for compliance with Redmond’s standards. Public projects that are in the right-of-way, do not typically trigger local permits; however, other public projects are subject to and abide by Appendix 1 of the NPDES permit. The City’s stormwater engineers review projects that trigger temporary erosion and sediment control (TESC) plans, wet weather plans, or stormwater pollution prevention plans Once the City has accepted a plan to control erosion, runoff and other potential construction impacts, and prior to extensive clearing and construction, City staff inspects the site to ensure that the proper TESC measures have been selected, properly placed, and installed correctly. During construction, the City conducts frequent inspections at the worksite--typically more than once a week when utilities are being constructed, and after major rain events--to ensure proper implementation and maintenance of TESC best management practices. Redmond inspectors have the authority to enforce Redmond Municipal Code (RMC) 13.06 and RMC 15.24, using corrective action notices and stop work orders, to insure the protection of receiving waters from construction impacts. After construction, the City again inspects stormwater structures at a project site. If the maintenance thresholds have been triggered, the City requires that needed maintenance take place. If the maintenance thresholds have not been reached, or once maintenance has been completed, the City then accepts the project. ---PAGE BREAK--- 8 2018 City of Redmond SWMP S5.C.4.c Post Construction Operation and Maintenance The City authorizes provisions to verify adequate long-term operation and maintenance (O&M) of post-construction stormwater facilities and BMPs. RMC 13.06 requires inspection and maintenance of private stormwater facilities, and all stormwater structures (including pipes and catch basins). RMC 13.06 also establishes enforcement authority. In 2016, Redmond adopted maintenance standards equivalent to or more protective than those established in the 2012 Stormwater Management Manual for Western Washington (Volume V, Chapter The City has records of our private stormwater inspection program dating back to 1990. These records enable the City to use a reduced frequency inspection of stormwater infrastructure as allowed by the permit in S5.C.4.c.iii. Based on an analysis of these program records, the City inspects private stormwater treatment and flow facilities every other year on a rotating basis, splitting drainages between even and odd numbered years. In 2018, the City will inspect stormwater facilities in the following basins: Willows, Peters Creek, Bear, Evans, and Kelsey Creek and as well as coalescing plate vaults and media cartridges vaults. For additional information regarding why and how the City uses reduced frequency inspections, contact Peter Holte, [PHONE REDACTED]. When maintenance needs are identified, City staff notifies the property owners. The property owners provide the City with receipts and other documentation as proof that the work has been completed. In some cases, the private stormwater facilities inspection coordinator will revisit the site to ensure that necessary maintenance has occurred. As mentioned previously, all stormwater infrastructure, including runoff treatment and flow control facilities, are inspected post construction one year after acceptance, to release warranty bonds. Once this occurs, sites are added to the long term private system inspection program and typically get inspected within one year from the warranty bond release. During heavy house construction, single-family home inspectors inspect the stormwater drainage system that can potentially be impacted by the home construction activity. This occurs every six months until 90% of the lot have been built out. If facilities and stormwater conveyance require cleaning during home construction, responsible parties are required to perform maintenance/cleaning. S5.C.4.d Notice of Intent (NOI) The City makes the application for NOIs for coverage under the NPDES Construction Stormwater General Permit and the NPDES General Industrial Stormwater Permit available to the development proponents. Copies of the application are also available at Redmond City Hall, in the Development Services Center. This activity is on-going in 2017. S5.C.4.e Staff Training All staff responsible for plan review of stormwater runoff controls are licensed professional engineers or qualified consultants. Follow-up training is provided as needed to address changes in standards, procedures, techniques, and staffing. City staff members responsible for inspection of stormwater infrastructure are adequately ---PAGE BREAK--- 9 2018 City of Redmond SWMP trained to do so. All staff responsible for managing construction TESC measures are Certified Erosion and Sediment Control Lead (CESCL) trained. Additional Public Works construction staff and maintenance technicians may also receive their first CESCL certification if it is determined it will ensure that the City’s inspection requirements are being met. The City will continue to document and maintain records of training provided and the staff trained. S5.C.4.f Low Impact development code-related requirements In 2016, the City completed the permit’s requirement to review, revise, and alter City codes, standards, and procedures with the goal of making low impact development (LID) the “preferred and commonly-used approach to site development.” The City completed the required “LID integration” report and submitted it as part of the annual report covering permit activities for 2016. In 2017, and onward, the City will continue to conduct the work necessary to ensure LID practices are fully integrated in Redmond’s stormwater management practices and operations. S5.C.4.g Watershed-scale stormwater planning The City actively participated in the development of the Bear Creek Watershed Management Study—a project led by King County. In 2018, the City will continue to coordinate and communicate with King County regarding next steps and future actions. ---PAGE BREAK--- 10 2018 City of Redmond SWMP POLLUTION PREVENTION AND OPERATION AND MAINTENANCE FOR MUNICIPAL OPERATIONS The City of Redmond has taken many steps to insure operation and maintenance activities are done in a manner that protect and reduce potential impacts to stormwater drainage and receiving waters. S5.C.5.a Maintenance Standards The City adheres to and has adopted maintenance standards in Chapter 4 of Volume V of the 2005 Stormwater Management Manual for Western Washington. In some instances, the City exceeds maintenance requirements. In 2016, the City adopted the new standards within the 2012 Stormwater Management Manual for Western Washington. S5.C.5.b Annual Inspection of Flow Control and Runoff Treatment Facilities The City currently inspects and maintains flow control and runoff treatment facilities owned and operated by the City to ensure they are maintained in accordance with City standards. Control structures related to ponds and bioswales are inspected annually. The stormwater crew uses a GIS database to inspect, identify maintenance needs, and detail what facilities have been maintained. Cleaning and maintenance occurs within the timeframe prescribed by the NPDES Permit. New stormwater treatment and flow control facilities are added to the inspection list when the City takes them into ownership. In some cases, the stormwater crew relays maintenance issues to City stormwater engineers so they can assess if the issue can be addressed for less than $25,000. If the remedy exceeds $25,000, it is considered a capital improvement project and is placed on a list of prioritized capital stormwater facility needs. S5.C.5.c Major Storm Event Inspections The City typically inspects the stormwater system during and after large storm events. In 2017, as per NPDES requirements, the City’s stormwater crew and City engineers will inspect the stormwater system should we have an event that is equal to or greater than the 10-year 24-hour storm (2.8 inches of rainfall in 24 hours). S5.C.5.d Catch Basin Inspections In 2018, the City is piloting catch basin inspections using “circuits” approach as allowed within the NPDES permit. Using guidance from the Washington Department of Ecology, Redmond is conducting a pilot project in select drainage basins. Results of this pilot project will inform a program to implement a circuit approach citywide. The current plan is to alternate the use of this circuit approach in basins throughout the City each inspection cycle. As a result, all catch basins will be inspected at least once every four years, and select catch basins within these circuits will be inspected every two years. During circuit inspections, should the select basins need cleaning, additional inspections will occur at the nearby catch basins. The City cleans all catch basins which have 50% of the catch basin’s storage capacity filled. This exceeds the City’s formal standard of 60%. Maintenance and cleaning of catch basins occurs within 6 months of the inspections as required by the permit. ---PAGE BREAK--- 11 2018 City of Redmond SWMP S5.C.5.f Reduction of Municipal Operations Stormwater Impacts Redmond has developed and adopted procedures for all items listed in the permit requiring documentation of practices/procedures. Locally developed standard operating procedures (SOPs) are equivalent or more protective of receiving waters than those in Volume V of the 2005 Ecology Stormwater Management Manual for Western Washington. Procedures and associated policies have been developed and provided to maintenance staff and maintenance staff supervisors/management in Public works and Parks and Recreation; training has been provided. S5.C.5.g O&M Employee Training The City maintains a training program for all operations field staff on procedures necessary to protect stormwater drainage and receiving waters. The training also included Redmond specific information on water quality and IDDE awareness as discussed in the IDDE section of this plan. All maintenance staff have been trained and plans have been established to train new maintenance employees, including limited duration employees. In 2018, the City is evaluating at what interval to repeat this training and evaluating possible improvements. S5.C.5.h Stormwater Pollution Prevention Plan for Redmond’s Maintenance and Operations Center The City developed a for its Maintenance and Operations Center. The plan was developed using a consulting firm (Brown and Caldwell) with experience developing for industrial sites. The City’s details a stormwater and BMP monitoring program, spill response protocol, structural (with implementation dates) and operational BMPs, site maps, contaminant inventory, and a schedule to annually review the The current has been updated to reflect new construction at the Public Works and Parks Maintenance and Operation Center (MOC). As required by the MOC staff will continue to conduct monitoring in accordance with the schedules provided in the S5.C.5.i Record Maintenance The City maintains records of inspection, maintenance, and repair to City operated stormwater facilities as detailed in each section of S5.C.5. ---PAGE BREAK--- 12 2018 City of Redmond SWMP MONITORING AND ASSESSMENT For a number of years, the City of Redmond has monitored both water quality in lakes, rivers and streams, and the effectiveness of best management practices to protect water quality. The 2013-2018 permit now requires all permittees to either pay into a regional monitoring program or conduct water quality monitoring as defined by the permit. The following details how the City will meet permit requirements related to: a) status and trends monitoring, b) effectiveness studies, and c) source identification and diagnostic monitoring. S8. A. Annual Reporting In 2018, the City provided a description of studies of monitoring and stormwater related activities conducted by or on behalf of the City as part of this annual report. S8.B Status and Trends Monitoring During the 2013-2018 permit cycle, the City of Redmond chose to conduct its own status and trend monitoring, as is allowed by the permit. The City has fulfilled its obligations to meet this requirement as detailed in the permit. For information on the monitoring reports generated by this effort, please contact Peter Holte, 425- 556-2822. S8.C Effectiveness Studies The City has chosen to buy into the Regional Stormwater Management Program (RSMP) effectiveness study in order to meet this requirement. In 2018, the cost to City of Redmond to buy into this program is $21, 899.00. S8.D Source Identification and Diagnostic Monitoring The City is required to pay into the RSMP source identification and diagnostic monitoring program. In 2018, the cost to City of Redmond to buy into this program is $2,013.00.