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BMP's for other hard surfaces: <br />1. Sheet Flow Dispersion: <br />A total of approximately 1,211 sf of PGIS is. proposed for this project. The runoff <br />generated by the driveway surfaces will be dispersed via sheet flow dispersion. As per <br />BMP a:2.70, a :minimum .10 ft flow path over amended or existing vegetated soils, <br />meeting BMP 12.20 will be provided for the.PGIS-runoff beforethe. dispersedsheet <br />flows leave the site, are collected by any critical area or pass over any additional hard <br />surfaces. <br />Finally, any area of the site not proposed to be covered. with impervious surfaces but <br />graded or compacted will be treated to meet the criteria for BMP 12.20. Please refer to <br />the- engineering plans for basic soil amendment notes. <br />8. SUMMARY <br />This project proposes to construct less than 5,000 sf of new impervious surfaces including <br />driveway and roof areas.: As a result, the use and land. cover for less than, 5,000 sf of the <br />site will be converted from pervious grass to impervious surfaces or replaced impervious <br />surfaces. On -site stormwater management techniques have been incorporated into .the <br />design., to mitigatefor this land . conversion.. In addition, . basedon the proposed <br />improvements for the site drainage design the post developed runoff from the site is <br />expected to be slightly greater than the runoff from the existing system. Therefore, the <br />stormwater design for this project has met or exceeded all of the applicable Minimum <br />Requirements 1-5. <br />Haack 75th SFR 20-0817 <br />September 2020 <br />Revised November2020 Page 10. <br />