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e AOL WASTE DISCHARGE REQUIREMENTS -2- COUNTY OF SAN JOAQUIN NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL CLASS III LANDFILL SAN JOAQUIN COUNTY WASTES AND TBEIR CLASSIFICATION The Discharger proposes to discharge wastes classified under Chapter 15 as 'non-hazardous solid waste' and 'inert waste'. The site serves the franchised collectors for the City of Lodi and the County Refuse Service Area B, as well as the general public and the commercial haulers servicing the northern part of San Joaquin County. DESCRIPTION OF SITE Land within 1.000 feet of the site is primarily agricultural, residential and livestock grazing. The soils immediately underlying the landfill are typical of those found in the San Joaquin Valley. The surface soils consist of 2 to 3 feet of a sandy loam underlain by approximately 0.5 feet of cemented hardpan. The next 100 feet consist of consolidated interbedded sands. silts and clays with individual layers 1.5 to 5 feet thick. The ground water flows in a generally southwest direction beneath the site, ranging between -35 to -41 feet below mean sea level (MSL). Calculated flow velocity is about 3.7 ft/yr. with a hydraulic gradient of about 1.2 x 10-3 ft/ft. The beneficial uses of around water are municipal. domestic, agricultural and industrial supply. 0. The site receives an average of 14 inches of precipitation per year (as measured at the Stockton Disposal Site 1957 - 1991). The mean evaporation for this facility is 67.95 inches per vear (as measured at Lodi, 1931 - 1979). Based on these data, average annual net evaporation at the site is about 54 inches. 1. The 100 year. 24-hour precipitation event for the site is 3.65 inches (as calculated at the Stockton Disposal Plant). 2. The site is not within the 100 year floodplain. However, the site is within Flood Zone C. which is an area subject to minimal flooding. The flooding threat will be mitigated by the construction of flood control berms. Berm construction will be done as filling proceeds from module to module and will be documented to the Board as construction proceeds.