Reso PC19-16 0098 PC Reso 910 Woodside Road

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17, 2017, without written approval from the Engineering Department. b. Self -Treating and Self -Retaining Areas — The improvement plans shall include a Drainage Area Management Plan, which shall clearly indicate which areas of the site are intended to be self -treating and which are intended to be self-retaining. The plan shall include adequate information to confirm that the areas are designed in accordance with the C.3 Stormwater Technical Guidance for each of those designated types. i. In order to be considered a self -treating area, the void space in the subbase/base layer (for pervious pavers) or planting media (green roof) below the subdrain must have sufficient capacity in the void space to store the MRP C.3.d volume of rainfall runoff for the area of pervious pavers or green roof. Self -treating areas may not accept runoff from other impervious areas. In order to be considered a self-retaining area, the subbase/base layer (for pervious pavers) or planting media (green roof) below the subdrain must have sufficient capacity in the void space to store the MRP C.3.d volume of runoff for both the area of pervious paving/green roof and the area that drains to it; however, the self-retaining area may not accept runoff from an area of impervious surface that has a surface area of more than two times the surface area of the pervious paving/green roof area. Any inlets or overflow drains are installed in the self-retaining area, they must be set at an elevation high enough to allow ponding throughout the entire surface of the self-retaining area. c. Green Roof — The green roof shall be designed in accordance with section 6.8 of the C.3 Technical Guidance. i. The planting media shall be sufficiently deep to support the long-term health of the vegetation selected for the green roof, as specified by the landscape architect. ii. The green roof shall be irrigated. iii. The design and installation of the green roof system shall be completed by an established vendor. d. Pervious Pavers — The pervious pavers shall be designed in accordance with section 6.6 of the C.3 Technical Guidance. e. Small Project — The project is planning to utilize self -treating and/or self- retaining areas to bring the impervious surface of the site below the C.3 "Regulated Projects" threshold of 10,000 SF. Because the project is still creating over 2,500 SF of impervious area, it will qualify as a "small project" under the Municipal Regional Permit (MRP) and shall incorporate at least one of the site design measures required for small projects in section C.3.i of the MRP. f. Treatment Measure Inspection — Applicant shall coordinate installation of stormwater treatment measures with the municipality, shall arrange to have the City's designated inspector present at the time of installation, and shall have the City's designated inspector complete a final inspection of installed Page 16 of 26 ATTY/RESO.0098/PC RESO 910 WOODSIDE ROAD REV: 10-09-19 PR