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Tetra Tech, Inc. King County PSERN 19803 North Creek Parkway Redmond, WA Education Hill Site Bothell, Washington 98011 TETRA TECH, INC. 19803 North Creek Parkway Bothell, Washington 98011 Telephone (425) 482-7800 FAX (425) 482-7830 September 9, 2016 Sarah Telschow, AICP Odelia Pacific Corporation 5506 6th Avenue South, Suite 202 Seattle, Washington 98108 RE: King County Puget Sound Emergency Radio Network (PSERN) Redmond, WA Education Hill Site Critical Areas Report Request Dear Ms. Telschow: This letter is in response to your email requests dated August 2 and August 4, 2016 to provide a revised Critical Areas Report (CAR) on the subject site located at 10365 172nd Avenue NE in the Cityof Redmond, in urban King County, Washington 98052. On June 27, 2016 Tetra Tech provided Odelia Pacific Corporation a limited desktop assessment of critical area conditions report based on previous correspondence with you informing us that City of Redmond sources had indicated that a full CAR would not be required because no critical areas had been identified at the subject site. Since submittal of the June 27, 2016 CAR, the City of Redmond has requested additional information be provided including a Level One Hydrogeologic Assessment, Priority Habitat and Protected Species information, and a Habitat Unit Assessment form. The additional information requested by the City of Redmond is discussed below with specific details included as attachments to this CAR. King County is proposing to construct a 170-foot-high steel monopole structure on the site to support a new microwave antenna, place ancillary equipment cabinets and a backup generator on site, and surround the site with chain-link fencing. The facilities would be operated as part of the Puget Sound Emergency Radio Network (PSERN). The facilities would be constructed within a 49.5-foot by 40-foot proposed lease area located near the center of a 4.8-acre parent parcel in a predominantly residential area on Education Hill in Redmond. The parent parcel is owned by the City of Redmond. Most of the northern half of the parcel has been developed to support City water supply system facilities, including two cylindrical, steel water storage tanks and a pump house. The water system facilities are enclosed by an existing chain-link fence. The remainder of the parcel is undeveloped and has a vegetative cover of mature conifer and deciduous trees and understory plants. The parent parcel is abutted on the north by NE 104th Street; on the east by 172nd Avenue NE; on the south by undeveloped land within a parcel on which a Church of Latter-Day Saints facility is located; and on the west by Horace Mann Elementary School. Sports fields within Jonathan Hartman Park are located to the east of 172nd Avenue NE, and single-family residential development and the Redmond High School campus are located north of NE 104th Street. ATTACHMENT 14 ---PAGE BREAK--- Tetra Tech, Inc. 2 King County PSERN 19803 North Creek Parkway Redmond, WA Education Hill Site Bothell, Washington 98011 INVESTIGATION ACTIVITIES AND RESULTS Tetra Tech’s desktop assessment of the site included a thorough review of the following information sources: 1. The PSERN Education Hill site plan set for the facility, prepared by Camp + Associates and dated June 2, 2016. 2. Redmond Zoning Code (RZC) critical areas regulations (RZC 21.64 – 21.72) and the associated reporting requirements identified in RZC Appendix 1. 3. City of Redmond Geographic Information System (GIS) mapping of environmental resources within the City. 4. Google mapping and imagery for the local area. The assessment was conducted by several Tetra Tech staff including Mr. Chris Lawson, a Senior Environmental Planner; Mr. Steve Negri, a Senior Wildlife Biologist; and Mr. JeremyDierking, a Geotechnical Engineer. Tetra Tech staff have extensive experience with local, state and federal permit requirements, and is thoroughly familiar local regulation of critical areas under the guidance of the Washington Growth Management Act. The City of Redmond identifies and regulates the following as critical areas: fish and wildlife habitat conservation areas; wetlands; frequently flooded areas; geologically hazardous areas; and critical aquifer recharge areas (RZC 21.64.010B). Specified buffers associated with these features are also regulated under the code. Based on the information reviewed during the assessment, existing conditions at the site in relation to the respective categories of critical area features are summarized as follows: 1. Fish and Wildlife Habitat Conservation Areas. As noted above, the proposed lease area is a small portion of a 4.8-acre parent parcel that is partially developed with water system facilities and partially tree-covered. The proposed lease area is immediately adjacent to the fence enclosing the water system facilities on the parcel. The northern edge of the lease area is approximately 30 feet from the pump house and asphalt access drive on the parcel, 120 feet from the larger water tank, and 130 feet from 172nd Avenue NE, a paved, two-lane roadway. The Redmond GIS map titled Fish and Wildlife Habitat Conservation Areas (Core Preservation Areas), provided in Attachment A, identifies the adjacent Jonathan Hartman Park as a feature in the Park and Open Space category. Although forest cover remains in the southeastern portion of Hartman Park, the northwestern part of the park adjacent to the parent parcel includes a set of four baseball fields, a parking area, a paved basketball court, and a large soccer field with artificial turf. The Redmond GIS map titled Critical Areas Map, Map 64.3 Streams Classification identifies a Class III stream beginning near the south edge of Hartman Park, approximately 0.3 mile to the southeast of the lease area, and flowing to the southeast. No other stream features identified on this map are located closer to the lease area. Therefore, there does not appear to be any fish habitat located near the project site. The undeveloped portion of the parent parcel likely provides some wildlife habitat value, although the value would be limited by the small size of the undisturbed area and the influence of structures intensive human uses on adjacent parcels. On August 4, 2016, Tetra Tech was requested to determine if any WDFW Priority Habitat or Protected Species could be present on the subject site, and to complete the City of Redmond Habitat Unit Assessment Form. Provided in Attachment A is a letter prepared by Mr. Steve Negri, a Senior Wildlife Biologist for Tetra Tech, that includes the City of Redmond Habitat Unit Assessment Form, and conclusions and recommendations for the project following further assessment of this site. ATTACHMENT 14 ---PAGE BREAK--- Tetra Tech, Inc. 3 King County PSERN 19803 North Creek Parkway Redmond, WA Education Hill Site Bothell, Washington 98011 2. Wetlands The Redmond GIS map titled Wetlands Critical Areas Map, provided in Attachment B, identifies known wetland features within the City and is intended for use as a general reference, rather than as a definitive record of all wetland areas within the City. The map identifies a relatively large wetland area along the southern edge of Jonathan Hartman Park and extending to the south. This wetland is more than 0.2 mile from the proposed lease area, and is the closest known wetland identified on the map. The closest water feature (which could have associated wetland resources) identified on the wetland map appears to be at least 0.3 mile to the northeast. The site plan (Sheet 5) indicates the developed portion of the parent parcel slopes gradually from elevation 400 feet to 396 feet, and does not identify any existing low areas that might be natural drainage features where water might collect. 3. Frequently Flooded Areas The Redmond GIS map titled Frequently Flooded Areas Critical Areas Map, provided in Attachment C, identifies known floodplain and FEMA floodway features within the City. The frequently flooded areas shown on this map that are closest to the lease area are located along Bear Creek, about 1 mile to the east, and along the Sammamish River, about 0.8 mile to the west. The Redmond GIS map titled Critical Areas Map, Map 64.3 Streams Classification, provided in Attachment C, identifies a Class III stream beginning near the south edge of Hartman Park (evidently draining from the wetland area noted above), approximately 0.3 mile to the southeast of the lease area, and flowing to the southeast. No other stream features identified on this map are located closer to the lease area. Interpretation of the City maps of frequently flooded areas and streams indicates that no water features capable of causing even localized flooding are located on or close to the proposed lease area or the parent parcel. 4. Geologically Hazardous Areas Geologically hazardous areas as defined in the RZC include areas susceptible to erosion, sliding, earthquake, or other geological events. Available Redmond GIS products include an Erosion Hazard Areas Critical Areas Map and Critical Areas Map, Map 64.7 Landslide Hazards, which are provided in Attachment D. Both maps depict a pattern of hazards in steeply sloping areas along the southeast and westerly margins of Education Hill and in prominent ravines; none of the mapped hazard areas are within 0.25 mile of the proposed lease area. As noted above, the project site is very gently sloping and has an elevation change across the site of approximately 4 feet. The City’s Seismic Hazard Areas Critical Areas Map indicates that the valley floor areas along Bear Creek and the Sammamish River are considered to be seismic hazard areas, likely based on the potential for soil liquefaction in those areas. The proposed lease area is located at least 0.8 mile from any of the identified seismic hazard areas. 5. Critical Aquifer Recharge Areas With respect to critical aquifer recharge areas, the City has assigned all locations within the city limits to one of four wellhead protection zones that are defined based on groundwater travel time to any water supply well owned by the City. The official Wellhead Protection Zones map, provided in Attachment E, indicates that the proposed lease area and the parent parcel are within Wellhead Protection Zone 3, which represents the area in the 5-year and 10-year travel time zones to any City well, exclusive of the areas within Wellhead Protection Zones 1 or 2 (the 6-month and 1-year travel time zones, respectively). Certain land uses or activities that are considered to represent a significant hazard to the City’s groundwater resources are prohibited in Zones 1 and 2. Development activity within Zone 3 is required to specified performance standards for vehicle fueling, maintenance and storage areas; loading and unloading areas; well construction and operation; fill materials; cathodic protection wells; underground hydraulic elevator cylinders; and best management practices identified in Section D of RZC 21.64.050. ATTACHMENT 14 ---PAGE BREAK--- Tetra Tech, Inc. 4 King County PSERN 19803 North Creek Parkway Redmond, WA Education Hill Site Bothell, Washington 98011 On August 2, 2016, Tetra Tech was requested to perform a Level I Hydrogeological Assessment. Provided in Attachment E is a Level I Hydrogeological Assessment prepared by Mr. Jeremy Dierking, a Geotechnical Engineer for Tetra Tech. consist of temporaryerosion/sediment control silt fences during construction, and consist of sheet flow dispersion post-construction. All impervious areas on the site will be managed with sheet flow, including the equipment shelter, leased area, and accessroad. Cross slopes along the access road and leased area will be a minimum of and runoff will be dispersed into vegetated buffers and soil amendments as shown in attached project plan Sheets C1.1, C2.1 and C3.1. Regarding fuel storage, King County is proposing to install a 2,000 gallon aboveground fuel storage tank. The proposed tank meets secondary containment requirements. During fueling activities, drip pans or absorbent materials will be placed under all potential drip and spill locations; spill control measures/spill kits will be placed near the tank and any liquid transfer areas; and a spill control plan will be available. CONCLUSIONS AND RECOMMENDATIONS The objective of this assessment was to identify whether any of the conditions present at the project site represent environmental features subject to regulation as critical areas under RZC 21.64. Based on the findings of the site review discussed above, Tetra Tech believes that a detailed on-site investigation would not result in the identification of any fish and wildlife habitat conservation areas, wetlands, frequently flooded areas, or geologically hazardous areas on the proposed lease area, on the parent parcel, or in immediatelyadjacent areas. Because the site is within Wellhead Protection Zone 3, the applicant will need to compliant with the applicable performance standards and BMPs relative to aquifer recharge areas. In our estimation, no further investigation of critical areas appears to be warranted at this time. Tetra Tech appreciates the opportunity to have worked with you on this project and we look forward to working with you in the future. If you have any questions or require additional information please feel free to call me directly at (425) 482-7811. Sincerely, Paul Bean Environmental Scientist Tetra Tech, Inc. Attachments Attachment A. Fish and Wildlife Habitat Conservation Areas Attachment B. Wetlands Critical Areas Map Attachment C. Frequently Flooded Areas Critical Areas and Streams Classifications Map Attachment D. Erosion Hazard Areas, Landslide Hazards, Seismic Hazard Areas Maps Attachment E. Level One Hydrogeologic Assessment ATTACHMENT 14 ---PAGE BREAK--- Tetra Tech, Inc. King County PSERN 19803 North Creek Parkway Redmond, WA Education Hill Site Bothell, Washington 98011 ATTACHMENT A FISH AND WILDLIFE HABITAT CONSERVATION AREAS ATTACHMENT 14 ---PAGE BREAK--- Tetra Tech, Inc. King County PSERN 19803 North Creek Parkway Redmond, WA Education Hill Site Bothell, Washington 98011 TETRA TECH, INC. 19803 North Creek Parkway Bothell, Washington 98011 Telephone (425) 482-7800 FAX (425) 482-7830 On August 4, 2016, Tetra Tech was requested to provide additional information in support of the CAR. Specifically, Tetra Tech was requested to determine if any WDFW Priority Habitat or Protected Species could be present on the subject site, and complete the City of Redmond Habitat Unit Assessment Form. The following information sources were used in support of this effort: 1. A one day site visit conducted on August 7, 2016, by Steve Negri. Mr. Negri is a Senior Wildlife Biologist located in our Bothell, Washington office and has more than 20 years of experience working in the Northwest, and is thoroughly familiar with the local flora and fauna. 2. The Washington Department of Fish and Wildlife Priority Habitats and Species (PHS) database. 3. The U.S. Fish and Wildlife Information for Planning and Conservation (IPaC) database. The completed Habitat Unit Assessment Form is attached to this letter (Attachment as well as photos of the subject site (Attachment Below is a brief summary of the results of our one day site visit and review of the PHS and IPaC databases. The habitat on the 4.8-acre parent parcel is characterized as a mature forest stand containing a mix of conifer species with pockets of alder (Alnus rubra) and Bigleaf maple (Acer Overstory species included Douglas-fir (Pseudotsuga menziesii), western hemlock (Tsuga and western red cedar (Thuja plicata). Understory species include alder, and sapling bigleaf maples and cedars. Native ground cover consisted primarily of sword fern (Polystichum munitum) and salal (Gaultheria shallon). Invasive plants species (Himalayan blackberry [Rubus armeniacus] and English ivy [Hedera helix] are abundant within the understory. English laurel [Prunus laurocerasus]) was also noted in two places along the western boundaryof the parent parcel. The parent parcel is not connected to other wildlife habitat areas. The northern portion of the site has been developed to support City's water supply system facilities, including two cylindrical steel water storage tanks and a pump house. The water system facilities are enclosed by an existing chain-link fence. The remainder of the parcel is bordered on all sides by suburban developments. Noise from the adjacent playgrounds/fields and the water pump house is noticeable throughout the parcel. Wildlife species identified during the field investigation included the evidence of pileated woodpecker (Hylatomus pileatus) foraging, and observations of gray squirrel (Sciurus carolinensis), Stellar's Jay (Cyanocitta stelleri), spotted towhee (Pipilo maculatus), and Oregon junco (Junco hyemalis). The pileated woodpecker is a WDFW Priority species a State candidate species); however, it was not identified when reviewing the PHS online mapper database. No other WDFW Priority Species or PriorityHabitats were noted to occur in the immediate vicinity of the parent parcel (Attachment Review of the U.S. Fish and Wildlife IPaC database indicated that the following federally listed species have the potential to occur in this portion of King County: marbled murrelet (Brachyramphus marmoratus), streaked horned lark (Eremophila alpestris strigata), yellow-billed cuckoo (Coccyzus americanus), wolverine (Gulo ATTACHMENT 14 ---PAGE BREAK--- Tetra Tech, Inc. 2 King County PSERN 19803 North Creek Parkway Redmond, WA Education Hill Site Bothell, Washington 98011 luscus), and bull trout (Salvelinus confluentus). However, suitable habitat is not present and the subject site is not capable of supporting these species. As a result, these federally listed species are not expected to occur within or near the subject site. CONCLUSIONS AND RECOMMENDATIONS In order to protect the WDFW Protected Species identified on the subject site the pileated woodpecker), Tetra Tech recommends the following recommendations: Retain snag if possible near clearing boundary, move existing dead/down logs, intact to degree possible, to areas outside of lease area boundary; Provide 3 new logs >15 inches in diameter and at least 10 feet in length, and place outside of lease area boundary, and clear during fall/winter months to avoid general avian species nesting periods. Attachments • Attachment 1: City of Redmond Habitat Unit Assessment Form • Attachment 2: Photos of the Subject Site • Attachment 3: WDFW PHS Online Mapper Output ATTACHMENT 14 ---PAGE BREAK--- Tetra Tech, Inc. King County PSERN 19803 North Creek Parkway Redmond, WA Education Hill Site Bothell, Washington 98011 ATTACHMENT 1 CITY OF REDMOND HABITAT UNIT ASSESSMENT FORM ATTACHMENT 14 ---PAGE BREAK--- ATTACHMENT 14 ---PAGE BREAK--- ATTACHMENT 14 ---PAGE BREAK--- Tetra Tech, Inc. King County PSERN 19803 North Creek Parkway Redmond, WA Education Hill Site Bothell, Washington 98011 ATTACHMENT 2 PHOTOS OF THE SUBJECT SITE ATTACHMENT 14 ---PAGE BREAK--- Photo 1. Site Vicinity Photo 2. Existing Downed Woody Material within the Proposed Lease Site Boundary. Photo 3. Invasive species documented throughout parent parcel (English Ivy). Photo 4. Existing Snag with old nest holes and evidence of Pileated Woodpecker Foraging Photo 5. Existing trail located near south end of parent parcel; note understory vegetation. ATTACHMENT 14 ---PAGE BREAK--- Tetra Tech, Inc. King County PSERN 19803 North Creek Parkway Redmond, WA Education Hill Site Bothell, Washington 98011 ATTACHMENT 3 WDFW PHS Online Mapper Output ATTACHMENT 14 ---PAGE BREAK--- SOURCE DATASET: WASHINGTON DEPARTMENT OF FISH AND WILDLIFE PRIORITY HABITATS AND SPECIES REPORT REPORT DATE: P160808150354 08/08/2016 3.04 Query ID: Priority Area Common Name Accuracy Source Entity Occurrence Type Resolution Notes Source Date Site Name PHS Listing Status Scientific Name Source Dataset State Status Mgmt Recommendations More Information (URL) Sensitive Data Federal Status Geometry Type Source Record DISCLAIMER. This report includes information that the Washington Department of Fish and Wildlife (WDFW) maintains in a central computer database. It is not an attempt to provide you with an official agency response as to the impacts of your project on fish and wildlife. This information only documents the location of fish and wildlife resources to the best of our knowledge. It is not a complete inventory and it is important to note that fish and wildlife resources may occur in areas not currently known to WDFW biologists, or in areas for which comprehensive surveys have not been conducted. Site specific surveys are frequently necesssary to rule out the presence of priority resources. Locations of fish and wildlife resources are subject to vraition caused by disturbance, changes in season and weather, and other factors. WDFW does not recommend using reports more than six months old. 08/08/2016 3.04 1 ATTACHMENT 14 ---PAGE BREAK--- WDFW Test Map Washington Fish and Wildlife WDFW PHS Report Clip Area PT LN AS MAPPED SECTION QTR-TWP TOWNSHIP August 8, 2016 0 0.3 0.6 0.15 mi 0 0.55 1.1 0.275 km 1:19,842 ATTACHMENT 14 ---PAGE BREAK--- SE Redmond Grass Lawn Spiritbrook Viewpoint Open Space Viewpoint Idylwood Beach Cascade View Westside Bridle Crest Trail Site Redmond West Wetlands Luke McRedmond Landing Edge Skate Park ORSCC Anderson OFH Bear Creek Reservoir Jonathan Hartman Sixty Acres (King County) Marymoor (King County) Juel Farrel- McWhirter Conrad Olson Farm Bear and Evans Creek Greenway Arthur Johnson Meadow NE Redmond Sammamish Valley Willows Creek Scotts Pond Sunset Gardens Municipal Campus Perrigo Nike Perrigo Heights L a k e L a k e S a m m a m i s h S a m m a m i s h UV 520 UV 520 188th AVE NE NE 124th ST AVON DALE WY CLEVEL A ND S T NE 24th ST NE 40th ST 166th AVE NE 156th AVE NE 172nd AVE NE 160th AVE NE NE 116th ST NE 80th ST NE 80th ST NE 104th ST NE 20th ST 164th AVE NE 132nd AVE NE NE 79th ST NE 76th ST 1 6 2nd AVE NE 154th PL NE 154 t h AVE NE NE 111th ST NE 90th ST E LK S AMMA MISH PKW Y 152nd AVE NE 185th AVE NE 180th AVE NE NE 128th ST UNION HILL RD B E A R C REE K P K WY NE 60th ST 154th AVE NE NE 124th WY NE 36t h ST 178th PL NE 132nd AVE NE NE 116th ST O LD R ED M O ND RD W L K SAMMAM I SH P K WY RED-WOOD RD 148th AVE NE BEL-RED RD 171st AV E N E WILL O WS RD 180th AVE NE 140th AVE NE 161st AVE NE 1 6 0 t h A V E NE NE 100th ST AVONDALE RD NE 85th ST NE 83rd ST 172nd AVE NE REDMOND WY 148th AVE NE NE 75th ST NE 5 1st ST 150th AVE NE REDMOND WY AVONDA L E RD Fish and Wildlife Habitat Conservation Areas (Core Preservation Areas) Critical Areas Map City of Redmond, Washington Ü 0 0.5 1 Miles Disclaimer: This map is created and maintained by GIS Services Group,Finance and Information Services, City of Redmond, Washington, for reference purposes only. The City makes no guarantee as to the accuracy of the features shown on this map. File Name:\\redmond.man\fs\GISUser\GIS\GISServicesProject\GISServices\RedmondGovWebsite\03GIS\FishWildlifAreas_11x17.mxd City Limit Park and Open Space Water Effective: 05/28/2005 Class 1 Streams and Buffers Native Growth Protection Easements Open Space Easements Transfer Development Rights Easements Note: This map shall be used as a general guide. It represents approximate locations. Consult the Critical Areas Ordinance (CAO) for reporting requirements. In the event there is a conflict between the map and the criteria or standards of the CAO, the criteria shall prevail. Data Source: USGS Geologic Maps ATTACHMENT 14 ---PAGE BREAK--- Tetra Tech, Inc. King County PSERN 19803 North Creek Parkway Redmond, WA Education Hill Site Bothell, Washington 98011 ATTACHMENT B WETLANDS CRITCAL AREAS MAPS ATTACHMENT 14 ---PAGE BREAK--- SE Redmond Grass Lawn Spiritbrook Viewpoint Open Space Viewpoint Idylwood Beach Cascade View Westside Bridle Crest Trail Site Redmond West Wetlands Luke McRedmond Landing Edge Skate Park ORSCC Anderson OFH Bear Creek Reservoir Jonathan Hartman Sixty Acres (King County) Marymoor (King County) Juel Farrel- McWhirter Conrad Olson Farm Bear and Evans Creek Greenway Arthur Johnson Meadow NE Redmond Sammamish Valley Willows Creek Scotts Pond Sunset Gardens Municipal Campus Perrigo Nike Perrigo Heights L a k e L a k e S a m m a m i s h S a m m a m i s h UV 520 UV 520 188th AVE NE NE 124th ST AVON DALE WY CLEVEL A ND S T NE 24th ST NE 40th ST 166th AVE NE 156th AVE NE 172nd AVE NE 160th AVE NE NE 116th ST NE 80th ST NE 80th ST NE 104th ST NE 20th ST 164th AVE NE 132nd AVE NE NE 79th ST NE 76th ST 1 6 2nd AVE NE 154th PL NE 154 t h AVE NE NE 111th ST NE 90th ST E LK S AMMA MISH PKW Y 152nd AVE NE 185th AVE NE 180th AVE NE NE 128th ST UNION HILL RD B E A R C REE K P K WY NE 60th ST 154th AVE NE NE 124th WY NE 36t h ST 178th PL NE 132nd AVE NE NE 116th ST O LD R ED M O ND RD W L K SAMMAM I SH P K WY RED-WOOD RD 148th AVE NE BEL-RED RD 171st AV E N E WILL O WS RD 180th AVE NE 140th AVE NE 161st AVE NE 1 6 0 t h A V E NE NE 100th ST AVONDALE RD NE 85th ST NE 83rd ST 172nd AVE NE REDMOND WY 148th AVE NE NE 75th ST NE 5 1st ST 150th AVE NE REDMOND WY AVONDA L E RD Wetlands Critical Areas Map City of Redmond, Washington Ü 0 0.5 1 Miles Disclaimer: This map is created and maintained by GIS Services Group,Finance and Information Services, City of Redmond, Washington, for reference purposes only. The City makes no guarantee as to the accuracy of the features shown on this map. File Name:\\redmond.man\fs\GISUser\GIS\GISServicesProject\GISServices\RedmondGovWebsite\03GIS\Wetlands_11x17.mxd Wetland Mixed Wetland/Upland City Limit Park and Open Space Water Effective: 05/28/2005 Data Source: USGS National Wetland Inventory Aerial Photo Interpretation SCS Soil Survey City of Redmond Note: This map shall be used as a general guide. It represents approximate locations. Consult the Critical Areas Ordinance (CAO) for reporting requirements. In the event there is a conflict between the map and the criteria or standards of the CAO, the criteria shall prevail. ATTACHMENT 14 ---PAGE BREAK--- Tetra Tech, Inc. King County PSERN 19803 North Creek Parkway Redmond, WA Education Hill Site Bothell, Washington 98011 ATTACHMENT C FREQUENTLY FLOODED AREAS CRITICAL AREAS MAP & STREAMS CLASSIFICATIONS MAP ATTACHMENT 14 ---PAGE BREAK--- SE Redmond Grass Lawn Spiritbrook Viewpoint Open Space Viewpoint Idylwood Beach Cascade View Westside Bridle Crest Trail Site Redmond West Wetlands Luke McRedmond Landing Edge Skate Park ORSCC Anderson OFH Bear Creek Reservoir Jonathan Hartman Sixty Acres (King County) Marymoor (King County) Juel Farrel- McWhirter Conrad Olson Farm Bear and Evans Creek Greenway Arthur Johnson Meadow NE Redmond Sammamish Valley Willows Creek Scotts Pond Sunset Gardens Municipal Campus Perrigo Nike Perrigo Heights L a k e L a k e S a m m a m i s h S a m m a m i s h UV 520 UV 520 188th AVE NE NE 124th ST AVON DALE WY CLEVEL A ND S T NE 24th ST NE 40th ST 166th AVE NE 156th AVE NE 172nd AVE NE 160th AVE NE NE 116th ST NE 80th ST NE 80th ST NE 104th ST NE 20th ST 164th AVE NE 132nd AVE NE NE 79th ST NE 76th ST 1 6 2nd AVE NE 154th PL NE 154 t h AVE NE NE 111th ST NE 90th ST E LK S AMMA MISH PKW Y 152nd AVE NE 185th AVE NE 180th AVE NE NE 128th ST UNION HILL RD B E A R C REE K P K WY NE 60th ST 154th AVE NE NE 124th WY NE 36t h ST 178th PL NE 132nd AVE NE NE 116th ST O LD R ED M O ND RD W L K SAMMAM I SH P K WY RED-WOOD RD 148th AVE NE BEL-RED RD 171st AV E N E WILL O WS RD 180th AVE NE 140th AVE NE 161st AVE NE 1 6 0 t h A V E NE NE 100th ST AVONDALE RD NE 85th ST NE 83rd ST 172nd AVE NE REDMOND WY 148th AVE NE NE 75th ST NE 5 1st ST 150th AVE NE REDMOND WY AVONDA L E RD Frequently Flooded Areas City of Redmond, Washington Effective: 05/28/2005 Ü 0 0.5 1 Miles Disclaimer: This map is created and maintained by GIS Services Group,Finance and Information Services, City of Redmond, Washington, for reference purposes only. The City makes no guarantee as to the accuracy of the features shown on this map. File Critical Areas Map Data Source: FEMA Flood Insurance Rate Maps Note: This map shall be used as a general guide. It represents approximate locations. Consult the Critical Areas Ordinance (CAO) for reporting requirements. In the event there is a conflict between the map and the criteria or standards of the CAO, the criteria shall prevail. FEMA Floodway City Limit 100 Year Floodplain Park and Open Space Water ATTACHMENT 14 ---PAGE BREAK--- York Creek Country Creek Tosh Creek Idylwood Creek Villa Marina Creek Gun Club Trib. Brae Burn Creek Stensland Creek Valley Estates Creek Tylers Creek Juel Creek Monticello High School Creek Kensington Trib. Willows Creek Perrigo Creek Bear Creek Clise Creek Evans Creek Lake Sammamish Mackey Creek Peters Creek Sammamish River NE 124th ST AVONDALE RD NE AVONDALE WAY NE 154th AVE NE REDMOND WAY 164th AVE NE 188th AVE NE NE 40th ST NE 109th ST 172nd AVE NE NE 116th ST NE 110th ST NE 80th ST CLEVELAND ST NE 80th ST 172nd AVE NE NE 24th ST 166th AVE NE 171st AVE NE NE 104th ST NE 20th ST 160th AVE NE BEL-RED RD NE 100th ST 160th AVE NE NE 36th ST LEARY WAY WILLOWS RD NE 161st AVE NE NE 51st ST NE 76th ST 162nd AVE NE OLD REDMOND RD 154th PL NE 180th AVE NE RED-WOOD RD NE BEAR CREEK PKWY NE 111th ST 148th AVE NE NE 24th ST 170th AVE NE 170th PL NE 152nd AVE NE NE 83rd ST 185th AVE NE NE 85th ST 180th AVE NE 171st AVE NE 169th AVE NE AVONDALE RD NE NE 90th ST 140th AVE NE NE 79th ST W LK SAMMAMISH PKWY 178th PL NE NE NOVELTY HILL RD UNION HILL RD BEL-RED RD E LK SAMMAMISH PKWY NE 31st ST NE 60th ST 154th AVE NE 159th PL NE 156th AVE NE 150th AVE NE City of Redmond Critical Areas Map Effective: XX XX XXXX Streams Classification Class I Stream Class II Stream Class III Stream Class IV Stream Sources: City of Redmond Public Works, Natural Resources Division City of Redmond GIS Services Washington Trout / Wild Fish Conservancy King County GIS Note: This map shall be used as a general guide representing the approximate location of streams, per RZC 21.64.010(E)(2). The map does not necessarily ensure the presence or absence of streams. In the event of a conflict between the map and the criteria of the Critical Areas Ordinance (CAO), the criteria shall prevail. Consult the CAO (RZC 21.64) for reporting requirements Note: Gaps in illustrated streams may indicate culverts, pipes, etc. Colin Creek Seidel Creek Mackey Creek ¹ Official USGS Stream Name Stream Stream Informal Stream Name Note: Informal stream names may not conform to USGS policies and may change in the future. 0 0.25 0.5 0.75 1 Miles \\redmond.man\FS\GISUser\Planning\COMPLAN & DEV GUIDE GRAPHICS\ArcGISMaps\ZoningCodeMaps\mxd\Map64_3_RZC_03122016.mxd Map 64.3 3/12/2016 ATTACHMENT 14 ---PAGE BREAK--- Tetra Tech, Inc. King County PSERN 19803 North Creek Parkway Redmond, WA Education Hill Site Bothell, Washington 98011 ATTACHMENT D EROSION HAZARD AREAS, LANDSLIDE HAZARDS, SEISMIC HAZARD AREAS MAPS ATTACHMENT 14 ---PAGE BREAK--- SE Redmond Grass Lawn Spiritbrook Viewpoint Open Space Viewpoint Idylwood Beach Cascade View Westside Bridle Crest Trail Site Redmond West Wetlands Luke McRedmond Landing Edge Skate Park ORSCC Anderson OFH Bear Creek Reservoir Jonathan Hartman Sixty Acres (King County) Marymoor (King County) Juel Farrel- McWhirter Conrad Olson Farm Bear and Evans Creek Greenway Arthur Johnson Meadow NE Redmond Sammamish Valley Willows Creek Scotts Pond Sunset Gardens Municipal Campus Perrigo Nike Perrigo Heights L a k e L a k e S a m m a m i s h S a m m a m i s h UV 520 UV 520 188th AVE NE NE 124th ST AVON DALE WY CLEVEL A ND S T NE 24th ST NE 40th ST 166th AVE NE 156th AVE NE 172nd AVE NE 160th AVE NE NE 116th ST NE 80th ST NE 80th ST NE 104th ST NE 20th ST 164th AVE NE 132nd AVE NE NE 79th ST NE 76th ST 1 6 2nd AVE NE 154th PL NE 154 t h AVE NE NE 111th ST NE 90th ST E LK S AMMA MISH PKW Y 152nd AVE NE 185th AVE NE 180th AVE NE NE 128th ST UNION HILL RD B E A R C REE K P K WY NE 60th ST 154th AVE NE NE 124th WY NE 36t h ST 178th PL NE 132nd AVE NE NE 116th ST O LD R ED M O ND RD W L K SAMMAM I SH P K WY RED-WOOD RD 148th AVE NE BEL-RED RD 171st AV E N E WILL O WS RD 180th AVE NE 140th AVE NE 161st AVE NE 1 6 0 t h A V E NE NE 100th ST AVONDALE RD NE 85th ST NE 83rd ST 172nd AVE NE REDMOND WY 148th AVE NE NE 75th ST NE 5 1st ST 150th AVE NE REDMOND WY AVONDA L E RD 50 100 400 450 350 150 250 300 200 350 250 300 150 200 150 100 300 450 50 400 200 50 50 50 50 250 150 100 150 50 100 100 100 200 350 100 250 300 300 300 350 200 350 300 250 150 100 300 100 450 50 250 350 300 250 300 150 250 400 350 200 50 50 150 50 300 100 400 150 250 150 300 200 50 100 50 50 350 200 150 200 300 200 250 150 400 250 450 50 300 300 50 300 150 300 400 50 50 250 300 200 350 250 100 50 100 50 300 100 Erosion Hazard Areas Critical Areas Map City of Redmond, Washington Ü 0 0.5 1 Miles Disclaimer: This map is created and maintained by GIS Services Group,Finance and Information Services, City of Redmond, Washington, for reference purposes only. The City makes no guarantee as to the accuracy of the features shown on this map. File Name:\\redmond.man\fs\GISUser\GIS\GISServicesProject\GISServices\RedmondGovWebsite\03GIS\ErosionHazardAreas_11x17.mxd Effective: 05/28/2005 Note: This map shall be used as a general guide. It represents approximate locations. Consult the Critical Areas Ordinance (CAO) for reporting requirements. In the event there is a conflict between the map and the criteria or standards of the CAO, the criteria shall prevail. Data Source: SCS Soil Survey Contour Erosion Hazard Area City Limit Water Park and Open Space ATTACHMENT 14 ---PAGE BREAK--- NE 124th ST AVONDALE RD NE AVONDALE WAY NE 154th AVE NE REDMOND WAY 164th AVE NE 188th AVE NE NE 40th ST NE 109th ST 172nd AVE NE NE 116th ST NE 110th ST NE 80th ST CLEVELAND ST NE 80th ST 172nd AVE NE NE 24th ST 166th AVE NE 171st AVE NE NE 104th ST NE 20th ST 160th AVE NE BEL-RED RD NE 100th ST 160th AVE NE NE 36th ST LEARY WAY WILLOWS RD NE 161st AVE NE NE 51st ST NE 76th ST 162nd AVE NE OLD REDMOND RD 154th PL NE 180th AVE NE RED-WOOD RD NE BEAR CREEK PKWY NE 111th ST 148th AVE NE NE 24th ST 170th AVE NE 170th PL NE 152nd AVE NE NE 83rd ST 185th AVE NE NE 85th ST 180th AVE NE 171st AVE NE 169th AVE NE AVONDALE RD NE NE 90th ST 140th AVE NE NE 79th ST W LK SAMMAMISH PKWY 178th PL NE NE NOVELTY HILL RD UNION HILL RD BEL-RED RD E LK SAMMAMISH PKWY NE 31st ST NE 60th ST 154th AVE NE 159th PL NE 156th AVE NE 150th AVE NE NE 116th ST Marymoor Park Marymoor Park 250 300 400 200 150 500 450 350 300 250 200 150 100 350 250 50 300 250 250 200 100 150 100 100 150 400 350 300 250 300 200 150 200 200 150 100 350 350 400 350 300 150 400 150 50 350 350 450 400 50 400 50 50 100 50 300 50 City of Redmond Critical Areas Map Effective: 03/12/2016 Landslide Hazards Legend Landslide Hazards Areas Contours Park Sources: City of Redmond GIS Services King County GIS Note: This map shall be used as a general guide representing the approximate location of steep slopes, per RZC 21.64.060(A)(1)b.vii. The map does not necessarily ensure the presence or absence of landslide hazards. In the event of a conflict between the map and the criteria of the Critical Areas Ordinance (CAO), the criteria shall prevail. Consult the CAO (RZC 21.64) for reporting requirements. 400 550 350 600 500 450 300 500 500 600 450 Watershed Preserve and Trails ¹ 0 1,400 2,800 4,200 Feet Map 64.7 G:\Planning\COMPLAN & DEV GUIDE GRAPHICS\ArcGISMaps\RCDG Rewrite\GIS\FinalDrafts\Map64_7_RZC.mxd ATTACHMENT 14 ---PAGE BREAK--- SE Redmond Grass Lawn Spiritbrook Viewpoint Open Space Viewpoint Idylwood Beach Cascade View Westside Bridle Crest Trail Site Redmond West Wetlands Luke McRedmond Landing Edge Skate Park ORSCC Anderson OFH Bear Creek Reservoir Jonathan Hartman Sixty Acres (King County) Marymoor (King County) Juel Farrel- McWhirter Conrad Olson Farm Bear and Evans Creek Greenway Arthur Johnson Meadow NE Redmond Sammamish Valley Willows Creek Scotts Pond Sunset Gardens Municipal Campus Perrigo Nike Perrigo Heights L a k e L a k e S a m m a m i s h S a m m a m i s h UV 520 UV 520 188th AVE NE NE 124th ST AVON DALE WY CLEVEL A ND S T NE 24th ST NE 40th ST 166th AVE NE 156th AVE NE 172nd AVE NE 160th AVE NE NE 116th ST NE 80th ST NE 80th ST NE 104th ST NE 20th ST 164th AVE NE 132nd AVE NE NE 79th ST NE 76th ST 1 6 2nd AVE NE 154th PL NE 154 t h AVE NE NE 111th ST NE 90th ST E LK S AMMA MISH PKW Y 152nd AVE NE 185th AVE NE 180th AVE NE NE 128th ST UNION HILL RD B E A R C REE K P K WY NE 60th ST 154th AVE NE NE 124th WY NE 36t h ST 178th PL NE 132nd AVE NE NE 116th ST O LD R ED M O ND RD W L K SAMMAM I SH P K WY RED-WOOD RD 148th AVE NE BEL-RED RD 171st AV E N E WILL O WS RD 180th AVE NE 140th AVE NE 161st AVE NE 1 6 0 t h A V E NE NE 100th ST AVONDALE RD NE 85th ST NE 83rd ST 172nd AVE NE REDMOND WY 148th AVE NE NE 75th ST NE 5 1st ST 150th AVE NE REDMOND WY AVONDA L E RD Seismic Hazard Areas Critical Areas Map City of Redmond, Washington Ü 0 0.5 1 Miles Disclaimer: This map is created and maintained by GIS Services Group,Finance and Information Services, City of Redmond, Washington, for reference purposes only. The City makes no guarantee as to the accuracy of the features shown on this map. File Name:\\redmond.man\fs\GISUser\GIS\GISServicesProject\GISServices\RedmondGovWebsite\03GIS\SeismicHazardAreas_11x17.mxd Effective: 05/28/2005 Data Source: USGS Geologic Maps Note: This map shall be used as a general guide. It represents approximate locations. Consult the Critical Areas Ordinance (CAO) for reporting requirements. In the event there is a conflict between the map and the criteria or standards of the CAO, the criteria shall prevail. Seismic Hazard Area City Limit Park and Open Space Water ATTACHMENT 14 ---PAGE BREAK--- Tetra Tech, Inc. King County PSERN 19803 North Creek Parkway Redmond, WA Education Hill Site Bothell, Washington 98011 ATTACHMENT E LEVEL ONE HYDROGEOLOGIC ASSESSMENT ATTACHMENT 14 ---PAGE BREAK--- 2525 Palmer Street, Suite 2, Missoula, MT 59808 Tel [PHONE REDACTED] Fax [PHONE REDACTED] www.tetratech.com August 29th, 2016 Sarah Telschow, AICP Odelia Pacific Corporation 5506 6th Avenue South, Suite 202 Seattle, WA 98108 SUBJECT: Level One Hydrogeologic Assessment PSERN – Education Hill Redmond, Washington Tetra Tech Project No. 114-571049 Dear Ms. Telschow: The City of Redmond has requested a Level One Hydrogeologic Assessment for the proposed Education Hill communications tower site located at 10365 172nd Avenue NE in the City of Redmond, in urban King County, Washington. King County is proposed to construct a 170-foot high steel monopole structure and associated equipment for the Puget Sound Emergency Radio Network (PSERN). The facility will be constructed within an approximately 50-foot by 40-foot fenced lease area. Following is a discussion of the required information for the Level One Hydrogeologic Assessment based on Redmond Zoning Code (RZC) critical areas regulations (RZC 21.64, Appendix 1, F.4). a) Geologic & Hydrogeologic Characteristics of the Site The project site is underlain by compact glacial till (commonly referred to as “hardpan”) consisting primarily of a non-sorted mixture of clay, silt, sand, pebbles, and cobbles, with some lenses of sorted, stratified sand and gravel. Internal drainage is reduced by the sandy to clayey till and it typically perches the water table for much of the year. Water tends to percolate readily down through the weathered, loose, sandy upper 4 to 6 feet, but perches and moves laterally along the buried unweathered ‘hardpan’ surface. These conditions can result in swampy areas on flat areas of hills, ridge tops, and uplands, and areas of saturated weathered till on hillsides during winter and spring. (Minard, J.P., and Booth, D.B., 1988, Geologic map of the Redmond quadrangle, King County, Washington: U.S. Geological Survey, Miscellaneous Field Studies Map MF-2016, scale 1:24,000) b) Groundwater Information Depth of water table in the site area varies greatly throughout the year due to perched water tables within the till deposit. Well logs throughout the area have static water levels ranging from 38 to 70 feet below ground surface. The site is located within a groundwater recharge zone and flow is generally down gradient toward the east. ATTACHMENT 14 ---PAGE BREAK--- Ms. Sarah Telschow August 29, 2016 2 c) Currently available data on wells and springs within 1,300 ft of site. The Department of Ecology for the State of Washington has two water well records located within 1,300 feet of the proposed site. The well records (attached) indicate the wells were decommissioned in 2008. d) Location of other critical areas, including surface waters within 1,300 ft of site. Surface Water located within 1,300 feet of the project site include: • A small pond is located approximately 800 feet to the west on the Mann Elementary school property. • The head of Perigo Creek is located approximately 1,200 feet southeast of the project site within Hartman Park. No other critical areas were identified within 1,300 feet of the project site. e) Historic Water Quality Data No historic water quality data is available for the area to be affected by the proposed activity. f) Best Management Practices (BMP) proposed to be utilized On-site BMPs will consist of temporary erosion/sediment control silt fences during construction, and consist of sheet flow dispersion post-construction. All impervious areas on the site will be managed with sheet flow, including the equipment shelter, leased area, and access road. Cross slopes along the access road and leased area will be a minimum of and runoff will be dispersed into vegetated buffers and soil amendments as shown in attached project plan Sheets C1.1, C2.1 and C3.1. Regarding fuel storage, King County is proposing to install a 2,000 gallon aboveground fuel storage tank. The proposed tank meets secondary containment requirements. During fueling activities, drip pans or absorbent materials will be placed under all potential drip and spill locations; spill control measures/spill kits will be placed near the tank and any liquid transfer areas; and a spill control plan will be available. If you have any questions, please contact myself or Cole Duncan at [PHONE REDACTED]. Respectfully submitted, TETRA TECH Jeremy Dierking, P.E. Project Geotechnical Engineer Attachments: Water Well Report No. 329981 and No. 329982 Education Hill Civil Drawings C1.1-C3.1 ATTACHMENT 14 ---PAGE BREAK--- ATTACHMENT 14 ---PAGE BREAK--- ATTACHMENT 14 ---PAGE BREAK--- ATTACHMENT 14 ---PAGE BREAK--- ATTACHMENT 14 ---PAGE BREAK--- ATTACHMENT 14 ---PAGE BREAK--- SE Redmond Grass Lawn Spiritbrook Viewpoint Open Space Viewpoint Idylwood Beach Cascade View Westside Bridle Crest Trail Site Redmond West Wetlands Luke McRedmond Landing Edge Skate Park ORSCC Anderson OFH Bear Creek Reservoir Jonathan Hartman Sixty Acres (King County) Marymoor (King County) Juel Farrel- McWhirter Conrad Olson Farm Bear and Evans Creek Greenway Arthur Johnson Meadow NE Redmond Sammamish Valley Willows Creek Scotts Pond Sunset Gardens Municipal Campus Perrigo Nike Perrigo Heights L a k e L a k e S a m m a m i s h S a m m a m i s h UV 520 UV 520 188th AVE NE NE 124th ST AVON DALE WY CLEVEL A ND S T NE 24th ST NE 40th ST 166th AVE NE 156th AVE NE 172nd AVE NE 160th AVE NE NE 116th ST NE 80th ST NE 80th ST NE 104th ST NE 20th ST 164th AVE NE 132nd AVE NE NE 79th ST NE 76th ST 1 6 2nd AVE NE 154th PL NE 154 t h AVE NE NE 111th ST NE 90th ST E LK S AMMA MISH PKW Y 152nd AVE NE 185th AVE NE 180th AVE NE NE 128th ST UNION HILL RD B E A R C REE K P K WY NE 60th ST 154th AVE NE NE 124th WY NE 36t h ST 178th PL NE 132nd AVE NE NE 116th ST O LD R ED M O ND RD W L K SAMMAM I SH P K WY RED-WOOD RD 148th AVE NE BEL-RED RD 171st AV E N E WILL O WS RD 180th AVE NE 140th AVE NE 161st AVE NE 1 6 0 t h A V E NE NE 100th ST AVONDALE RD NE 85th ST NE 83rd ST 172nd AVE NE REDMOND WY 148th AVE NE NE 75th ST NE 5 1st ST 150th AVE NE REDMOND WY AVONDA L E RD Wellhead Protection Zones City of Redmond, Washington 11/18/2010 Ü 0 0.5 1 Miles Disclaimer: This map is created and maintained by GIS Services Group,Finance and Information Services, City of Redmond, Washington, for reference purposes only. The City makes no guarantee as to the accuracy of the features shown on this map. File Name:\\redmond.man\fs\GISUser\GIS\GISServicesProject\GISServices\RedmondGovWebsite\03GIS\WellheadProtectionZone_11x17.mxd Wellhead Zone 2 Wellhead Zone 1 Wellhead Zone 4 City Limit Park and Open Space Water Wellhead Zone 3 ATTACHMENT 14