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J J <br /> setbacks and grading for the site). <br /> 4. Sheet Flow Dispersion in accordance with BMP T5.12, or Concentrated Flow Dispersion in accordance <br /> with BMP T5.11 in Volume V, Chapter 5 of this manual. (Will be used) <br /> To the extent possible,proposed on-site stormwater management meets the 2014 DOE SWWM Manual <br /> Infiltration Capacity:The USGS Evaluation for the site show the on-site soils are a Type C are a not suitable <br /> 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 /> To the extent possible,the proposed BMP's addresses the required stormwater management as outlined City Everett <br /> Stormwater Management including: <br /> • Runoff generated from the site improvements including roofs and driveways will be controlled through the use <br /> of perforated Stub-out Connections in accordance with BMP T5.10C and the driveway will be dispersed per <br /> BMP T5.12. <br /> • Pollution-generating impervious surface (PGHS) is currently under the 5,000 sf threshold and is therefore <br /> exempt from water quality per BMPs in Volume V, chapter 5 of the Drainage Manual However, stormwater <br /> from the driveway will be dispersed per BMP T5.12. <br /> • The use of applicable BMPs will be employed as outlined in Volume V Chapter 5 of the Drainage Manual. <br /> 7102 Lower Ridge RD Full Drainage Report <br /> Revised:November 3,2017 Page 11 <br />