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Correspondence RECEIVED • � JUL 2 0 2010 C1eanWate\ Services CITY OF TIGARD Our commitment is clear. BUILDING DIVISION CWS File Number Service Provider Letter 08- 000648 This form and the attached conditions will serve as your Service Provider Letter in accordance with Clean Water Services Design and Construction Standards (R &O 07 -20). Jurisdiction: Tigard Review Type: Tier 2/ Unbuildable Lot Site Address 8719 SW Locust ST/ f 7.3/ SPL Issue Date: June 28, 2010 / Location: Tigard, OR 97223 SPL Expiration Date: June 27, 2012 Applicant Information: Owner Information: Name Name MICHELE AND JAY GILBERT Company NYS ASSOCIATES Company Address 10250 SW 87TH AVE Address 6700 SW ALDEN ST TIGARD OR 97223 TIGARD OR 97223 Phone/Fax (503) 245 -6721 Phone/Fax (503) 320 -0735 E -mail: E -mail: Tax lot ID Development Activity 1S135AA00400 Single Family Residence (Duplex) • Pre-Development Site Conditions: Post Development Site Conditions: Sensitive Area Present: © On -Site © Off -Site Sensitive Area Present: © On -Site © Off -Site Vegetated Corridor Width: 50 Vegetated Corridor Width: 16 Vegetated Corridor Condition: Degraded Enhancement of Remaining Vegetated Corridor Required: Square Footage to be enhanced: 1500 Encroachments into Pre- Development Vegetated Corridor: Type and location of Encroachment: Square Footage: Duplex 2524 Mitigation Requirements: Type/Location Sq. Ft./Ratio /Cost No Mitigation Required; Unbuildable lot per Section 3.01.3. © Conditions Attached © Development Figures Attached (2) © Planting Plan Attached ❑Geotech Report Required - This Service Provider Letter does NOT eliminate the need to evaluate and protect water quality sensitive areas if they are subsequently discovered on your property. Page 1 of 5 • CWS File Number ( 08 -000848 In order to comply with Clean Water Services water quality protection requirements the project must comply with the following conditions: 1. No structures, development, construction activities, gardens, lawns, application of chemicals, uncontained areas of hazardous materials as defined by Oregon Department of Environmental Quality, pet wastes, dumping of materials of any kind, or other activities shall be permitted within the sensitive area or Vegetated Corridor which may negatively impact water quality, except those allowed in R &O 07 -20, Chapter 3. 2. Prior to any site clearing, grading or construction the Vegetated Corridor and water quality sensitive areas shall be surveyed, staked, and temporarily fenced per approved plan. During construction the Vegetated Corridor shall remain fenced and undisturbed except as allowed by R &O 07 -20, Section 3.06.1 and per approved plans. 3. Prior to any activity within the sensitive area, the applicant shall gain authorization for the project from the Oregon Department of State Lands (DSL) and US Army Corps of Engineers (USACE). The applicant shall provide Clean Water Services or its designee (appropriate city) with copies of all DSL and USACE project authorization permits. No activity authorized. 4. An approved Oregon Department of Forestry Notification is required for one or more trees harvested for sale, trade, or barter, on any non - federal lands within the State of Oregon. 5. Prior to ground disturbance an erosion control permit is required with Clean Water Services or the City. Appropriate Best Management Practices (BMP's) for Erosion Control, in accordance with Clean Water Services' Erosion Prevention and Sediment Control Planning and Design Manual, shall be used prior to, during, and following earth disturbing activities. 6. Prior to construction, a Stormwater Connection Permit from Clean Water Services or its designee is required pursuant to Ordinance 27, Section 4.B. 7. Activities located within the 100 -year floodplain shall comply with R &O 07 -20, Section 5.10. 8. Removal of native, woody vegetation shall be limited to the greatest extent practicable. 9. If treatment is required, the water quality swale and detention pond shall be planted with Clean Water Services approved native species, and designed to blend into the natural surroundings. 10. Should final development plans differ significantly from those submitted for review by Clean Water Services, the applicant shall provide updated drawings, and if necessary, obtain a revised Service Provider Letter. SPECIAL CONDITIONS 11. The Vegetated Corridor width for sensitive areas within the project site shall be the maximum width possible, but also allow the lot to become buildable. 12. Prior to any site clearing, grading or construction, the applicant shall provide Clean Water Services with a Vegetated Corridor enhancement/restoration plan. Enhancement/restoration of the Vegetated Corridor shall be provided in accordance with R &O 07 -20, Appendix A, and shall include planting specifications for all Vegetated Corridor, including any cleared areas larger than 25 square feet in Vegetated Corridor rated "good." 13. Prior to installation of plant materials, all invasive vegetation within the Vegetated Corridor shall be removed per methods described in Clean Water Services' Integrated Vegetation and Animal Management Guidance, 2003. During removal of invasive vegetation care shall be taken to minimize impacts to existing native tree and shrub species. 14. Clean Water Services or designee (appropriate city) shall be notified 72 hours prior to the start and completion of enhancement/restoration activities. Enhancement/restoration activities shall comply with the guidelines provided in Landscape Requirements (R &0 07 -20, Appendix A). 15. Maintenance and monitoring requirements shall comply with R&O 07 -20, Section 2.11.2. If at any time during the warranty period the landscaping falls below the 80% survival level, the owner shall reinstall all deficient planting at the next appropriate planting Page 2 of 5 CWS File Number 1 08.000648 • opportunity and the two year maintenance period shall begin again from the date of replanting. 16. Performance assurances for the Vegetated Corridor shall comply with R &O 07 -20, Section 2.06.2, Table 2 -1 and Section 2.10, Table 2 -2. 17. Clean Water Services shall require an easement over the Vegetated Corridor conveying storm and surface water management to Clean Water Services or the City that would prevent the owner of the Vegetated Corridor from activities and uses inconsistent with the purpose of the corridor and any easements therein. FINAL PLANS 18. Final construction plans shall include landscape plans. In the details section of the plans, a description of the methods for removal and control of exotic species, location, distribution, condition and size of plantings, existing plants and trees to be preserved, and installation methods for plant materials is required. Plantings shall be tagged for dormant season identification and shall remain on plant material after planting for monitoring purposes. 19. A Maintenance Plan shall be included on final plans including methods, responsible party contact information, and dates (minimum two times per year, by June 1 and September 30). 20. Final construction plans shall clearly depict the location and dimensions of the sensitive area and the Vegetated Corridor (indicating good, marginal, or degraded condition). Sensitive area boundaries shall be marked in the field. 21. Protection of the Vegetated Corridors and associated sensitive areas shall be provided by the installation of signage between the development and the outer limits of the Vegetated Corridors. Signage details to be included on final construction plans. • This Service Provider Letter is not valid unless CWS - approved site elan is attached. Please call (503) 681 -3653 with any questions. r Amber Wierck Environmental Plan Review Attachments (2) Page 3 of 5