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Schaffer SFR <br /> Upstream Analysis <br />• Sheet flow runoff appears to enter the site from forested areas on adjacent parcels to the <br /> west. No erosion or concentrated flows were observed due to this runoff. Runoff from the <br /> 112th Street SE right-of-way is intercepted by existing storm drainage systems and does <br /> not appear to enter the site. <br />• Downstream Analysis <br /> A downstream analysis was provided by Timothy Sarkela, E.I.T. of Western Engineers & <br /> Surveyors Inc., on July 27, 2017. Weather was overcast with a temperature around 65 <br /> degrees. Refer to the aerial map in the next section of this report for a depiction of runoff <br />• paths. <br /> Site runoff sheet flows toward wetland areas within the southern portion of the site(see <br /> photo 1). These wetland areas appear to discharge south toward an existing City <br /> documented storm drainage conveyance on a property to the south. Runoff entering the <br /> drainage system is conveyed south to 113th Street SE (see photo 2)where it crosses <br /> beneath 113th Street SE(see photo 3) and discharges into an existing storm drainage pond <br /> on the south side of l 13t Street SE (see photo 4). The drainage pond appear to outlet <br /> southeasterly toward 2nd Avenue SE(see photo 5),where it crosses beneath 2nd Avenue <br /> SE and discharges into the headwaters of Park Place Creek(see photo 6). As this is the <br /> closest receiving water, no further downstream analysis is required. <br />• <br /> Drainage Complaints <br /> There are no known drainage complaints for this site. <br />• <br />• <br />• <br /> WESTERN ENGINEERS,INC. 4 PROJECT:17-1666-A <br />