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WASTE DISCHARGE REQUIREMENTS -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. Existing <br /> elevations at the site range from 106 feet above mean sea level (m.s. l. ) in <br /> the northwest corner to 124 feet above m.s. l . in 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 found in <br /> the San Joaquin Valley. The surface soils consist of 2 to 3 feet of a sandy <br /> loam underlain by approximately 1/2 foot of cemented hardpan. Under this is <br /> at least 100 feet of consolidated interbedded sands, silts, and clays with <br /> individual layers 1 1/2 to 5 feet thick. <br /> 9. No known Holocene faults underlie the site. The closest known faults are <br /> the Bear Mountain fault zone (28 km east), and the Melones fault zone (38 km <br /> east). The maximum probable earthquake (MPE) for these faults is 5.7 <br /> (Richter scale) , which would produce an average peak horizontal acceleration <br /> of 0.10g. <br /> 10. The first water bearing formation ranges from approximately 96 to 118 feet <br /> below the base of the landfill. The hydraulic gradient is generally to the <br /> west-southwest. The quality of this water isood with low total dissolved <br /> solids (TDS) averaging 200 parts per million (ppm ) . <br /> 11. The beneficial uses of ground water are domestic, municipal , irrigation, <br /> process, and service supply. <br /> 12. The facility receives an average of approximately 14 inches of precipitation <br /> per year as measured at the Stockton Disposal Plant station over the past 34 <br /> years. The mean evaporation for this facility is 67.95 inches per year as <br /> measured at Lodi between the years 1931 and 1979. <br /> 13. The 100-year, 24-hour precipitation event for the facility is 3.65 inches, <br /> as calculated at the Stockton Disposal Plant. <br /> 14. The facility is not within a 100-year floodplain. The site is, however, <br /> within Flood Zone C, which is an area subject to minimal flooding. The <br /> flooding threat will be mitigated by the construction of flood control <br /> berms. The berms will be constructed around the modules as operations <br /> progress. <br /> 15. Surface drainage is to South Paddy Creek which crosses the site, and is an <br /> intermittent tributary to Bear Creek. South Paddy Creek will be rerouted <br /> around the east side of the site, then west across the site between the <br />