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r T. <br />j permitted to receive a maximum of 700 tons of refuse per ay. <br />e <br />u <br />4 an average of 17.5 inches of precipitation <br />Foothill Sanitary Landfill receives <br />per year. Furthermore, the 100 -year, 24-hour precipitation event for the site <br />rT <br />is 3.9 inches, as calculated by the Department of Water Resources (DWR)_ <br />Figure A is a USGS topographic map which shows the site location and the area <br />within approximately 1/4 mile of the site boundary. <br />Potter Creek, an intermittent winter flow waterway, flows south along the east <br />border of the facility boundary and flows into a detention pond at the <br />southeast corner of the property boundary as shown in Figure A. <br />Foothill Sanitary Landfill pumps its water used for daily operations from an <br />on site 253 feet deep well below the base of the landfill for dust control, <br />domestic water, etc. <br />f 2_0 EXISTING MANAGEMENT PRACTICES <br />'0 <br />This section discusses the facility's operation and management practices <br />related to the storm water system. Figure B shows the locations of the <br />facilities features. <br />2.1 FACILITY'S STORM DRAIN SYSTEM <br />The majority of storm water runoff from Foothill Sanitary Landfill is natural <br />drainage which flows away from the center portion of the site outside the <br />current fill area to beyond the site boundaries. Most drainage outside the <br />fill area on the west side of the site flows westerly across Waverly Road and <br />out to pasture areas. A smaller portion of that runoff travels through a <br />drainage ditch along either side of the entrance road and into a ditch along <br />3 <br />