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WASTE DISCHARGE REQUIREMENTS ORDER R5-2015-0058-01 -11- <br />SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS <br />FOOTHILL SANITARY LANDFILL, INC. <br />FOOTHILL LANDFILL <br />SAN JOAQUIN COUNTY <br /> <br />48. The existing and potential designated beneficial uses of surface water, as specified in <br />the Basin Plan, are municipal and domestic supply, agriculture (stock watering and <br />irrigation), industrial (processing and service supply), water contact recreation (REC- <br />and non-contact water recreation (REC-2), warm and cold freshwater habitat, warm <br />and cold water migration of aquatic organisms, warm and cold water spawning, <br />wildlife habitat, preservation of rare, threatened and endangered species, and <br />groundwater recharge. <br />49. The landfill facility is not within a 100-year flood plain based on the Federal <br />Emergency Management Agency’s (FEMA) Flood Insurance Rate Map, Community - <br />Panel Number 06077C0390F, effective date October 16, 2009. <br />50. Based on data from the nearest weather station (Linden 5.8 ENE), the Facility has an <br />annual average precipitation of 19.8 inches. This is based on average monthly <br />precipitation from 1991 to 2020. The Facility has a mean pan evaporation of 70.5 <br />inches per year. The nearest weather station is reflective of conditions at the Facility. <br />51. Storm water runoff captured by LF-1’s precipitation and drainage controls is <br />discharged via an unlined perimeter ditch to a large retention basin on the eastern <br />side of the landfill. Runoff from LF-2, Module 1 is similarly conveyed to a small <br />retention pond near the southwest corner of the module or the borrow area <br />immediately south of Module 1, which spills over toward an onsite stream <br />discharging to a large stock pond in the southeast corner of the site. Water <br />leaving the landfill property along this route is sampled under the State Water <br />Board’s General Industrial Storm Water Permit, as required under Standard <br />4. A “Class A Evaporation Pan” is a standard-sized evaporation pan per U.S. National Weather Service <br />specifications. The pan is filled to a specified level at the beginning of each day and after 24 hours the amount of <br />water needed to restore that level (i.e., evaporation) is measured. When daily precipitation exceeds evaporation, <br />water is similarly removed from the pan.