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DRAINAGE REPORT <br />Miller Residence Drain <br />Figure 4 Looking East <br />SITE AREA AND SIZE OF IMPROVEMENTS <br />June 2023 <br />The site is approximately 0.52 acres with 59t" Street SW bounding the north of the project site. The <br />southern and eastern boundary of the project is zoned Parks -General Recreation per the Snohomish <br />County Online Property Information (SCOPI). The project proposes stormwater sheet flow from the <br />existing topography to enter a dispersion trench placed along the base of the proposed structural <br />retaining wall. The runoff will then disperse in an unconcentrated manner to the southwest. <br />The areas in Table 1 were determined by measurements in AutoCAD from the Civil Plan Set included in <br />APPENDIX A. <br />Table 1 Developed Site Conditions <br />AREA DESCRIPTION <br />PROJECT AREA TOTALS <br />SQ. FT. <br />ACRES <br />Non -Pollution Generating Impervious Surfaces (Non-PGIS) <br />Existing SFR Roof <br />3,441 <br />0.079 <br />Existing Patio and Walkway <br />1,481 <br />0.034 <br />Non -Pollution Generating Pervious Surfaces <br />Landscaping <br />1,176 <br />0.027 <br />Total Surfaces <br />6,098 <br />0.140 <br />DCG/Watershed <br />20230616 Miller Drainage Report FINAL Page 3 <br />