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WASTE DISCHARGE REQUIREMENTS FOR -2- <br /> SAN JOAQUIN COUNTY <br /> NORTH COUNTY SANITARY LANDFILL <br /> CLASS III LANDFILL <br /> SAN JOAQUIN COUNTY <br /> DESCRIPTION OF THE SITE <br /> 6. The landfill site is in gently rolling terrain in the transition zone <br /> between the San Joaquin Valley and the Sierra Nevada foothills. <br /> Existing elevations at the site range from 106 feet above mean sea <br /> level (m.s. l . ) in the northwest corner to 124 feet above m.s. l . in <br /> the southeast corner. <br /> 7. Land within 1000 feet of the facility is used for livestock grazing, <br /> agriculture, and some residential housing. <br /> 8. The soils immediately underlying the landfill are typical of those <br /> found in the San Joaquin Valley. The surface soils consist of 2 to <br /> 3 feet of a sandy loam underlain by approximately 1/2 foot of <br /> cemented hardpan. Under this is at least 100 feet of consolidated <br /> interbedded sands, silts, and clays with individual layers 1 1/2 to <br /> 5 feet thick. <br /> 9. No known Holocene faults underlie the site. The closest known faults <br /> are the Bear Mountain fault zone (28 km east) , and the Melones fault <br /> zone (38 km east). The maximum probable earthquake (MPE) for these <br /> faults is 5.7 (Richter scale) , which would produce an average peak <br /> horizontal acceleration of 0.10g. <br /> 10. The first water bearing formation ranges from approximately 96 to 118 <br /> feet below the base of the landfill . The hydraulic gradient is <br /> generally to the west-southwest. The quality of this water is good <br /> with low total dissolved solids (TDS) averaging 200 parts per million <br /> (ppm). <br /> 11. The beneficial uses of ground water are domestic, municipal , <br /> irrigation, process, and service supply. <br /> 12. The facility receives an average of approximately 14 inches of <br /> precipitation per year as measured at the Stockton Disposal Plant <br /> station over the past 34 years. The mean evaporation for this <br /> facility is 67.95 inches per year as measured at Lodi between the <br /> years 1931 and 1979. <br /> 13. The 100-year, 24-hour precipitation event for the facility is 3.65 <br /> inches, as calculated at the Stockton Disposal Plant. <br /> 14. The facility is not within a 100-year floodplain. The site is, <br /> however, within Flood Zone C, which is an area subject to minimal <br /> flooding. The flooding threat will be mitigated by the construction <br /> of flood control berms. The berms will be constructed around the <br /> modules as operations progress. <br />