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3. Bioretention in accordance with Volume V, Chapter 7 of this manual. (N/A). <br /> 4. Sheet Flow Dispersion in accordance with BMP T5.12, or Concentrated Flow Dispersion in accordance <br /> with BMP T5.1 1 in Volume V, Chapter 5 of this manual. (N/A) <br /> To the extent possible,proposed on-site stormwater management meets the 2014 DOE SWWM Manual <br /> Infiltration Capacity:The soils logs at the rear of the site show the a dark silt loam with seepage noted and is <br /> not suitable for infiltration. (See appendix) <br /> BMP T5.13 "Post Construction Soil Quality and Depth" <br /> The top soils will be stockpile on-site and reused per "Implementation Options #3 per BMP T5.13 "Post <br /> Construction Soil Quality and Depth" which requires "Stockpile existing top soils during grading and replace it <br /> prior to planting... " (See work sheets "List of Figures") <br /> Minimum Requirement #6 <br /> Runoff Treatment Requirements <br /> DRIVEWAYS AND PARKING PGHS AREA <br /> The combined new PGHS area is under the 5,000 sf the threshold. Therefore, no runoff treatment is required.. <br /> Minimum Requirement #7 <br /> Flow Control <br /> As discussed above,stormwater will be managed through the use of LID methods using splash blocks and 50-foot <br /> minimum flows paths through vegetation before leaving the site and has been designed using the LID applications <br /> as outlined in Volume III, Chapter 3, "Flow Control Design" of the DOE 2014 Stormwater Management Manual. <br /> The total impervious area including: home and driveway, is under the 5,000 sf threshold. Therefore the site <br /> qualifies for a small site drainage design. <br /> Water quality:Since the PGHS area is under 5,000 sf water quality is not required for the Driveway. <br /> Proposed Impervious Areas: <br /> • Rainier Half Street Widening: 775 Sf <br /> • Access Drive And Parking: 1,770 Sf <br /> • Max House Foot Print: 2,450 Sf (determined by building setbacks) <br /> Total Impervious Area: 4,995 Sf < 5,000 Sf Therefore No Flow Control Is Required <br /> To the extent possible,the proposed BMP's addresses the required stormwater management. <br /> Runoff generated from the site improvements including roofs and driveways will be controlled through the use <br /> of dispersal trenches using LID BMPs. <br /> Kymera 2-Lot SP Full Drainage Report <br /> Revised:April 21,2018 Page 11 <br />