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V . <br />n <br />1 SITE CHARACTERISTICS <br />L` <br />kn KLEINFELDER <br />Cove Contractors landfill is located in San Joaquin County at 3242 South El Dorado Street <br />in Stockton (Plate 1.1). According to the Mount Diablo Base and Meridian, the site is in <br />the eastern half of the southeast quarter of Section 23, Township 1 North, Range 6 East. <br />The Cove Contractors landfill is approximately 580 feet long in the north -south direction <br />and 700 feet wide in the east -west direction. The bottom elevation of waste at the landfill <br />is variable with an apparent maximum depth of approximately 20 feet below mean sea level <br />(-20 feet, msl). The top elevation of the landfill is variable and ranges from natural grade <br />[+ 16 feet, msl] to approximately -9 feet, msl. The landfill is not capped. <br />Duck Creek/Walker Slough parallels the south side of the landfill and is approximately 40 <br />feet from the landfill perimeter. The bottom of Duck Creek/Walker Slough appears to be <br />approximately 20 feet below natural grade, or -5 feet, msl, based on visual observations. <br />Flood Insurance Rate Maps published by the Federal Emergency Management Agency <br />(FEMA , 1983) indicate that the Cove Contractors landfill is located within Zone B, the <br />100 -Year fl000d plain, defined as land areas protected by levees from the base flood. <br />A small, intermittent, onsite pond is located on the north side of the landfill. This pond is <br />topographically low with respect to the landfill and the pond bottom may be at or near the <br />bottom of the waste. <br />The ground water in the uppermost water bearing unit (Zone III, discussed in Section <br />1.3.2) was at an elevation of approximately -17 feet, msl during August, 1988. Portions of <br />the landfill floor appear to have been excavated to below the potentiometric surface (refer <br />to Plate 1.19, Zone II Isopach). The boring log from MW -3 indicates waste material is <br />present below the potentiometric surface. Based on water elevations, water in the onsite <br />pond appears to represent the potentiometric surface in Zone III. <br />Based on hydraulic information for MW -5 and MW -6, located between the landfill and <br />Duck Creek/Walker Slough (refer to Cross Section, Plate 1.16), the uppermost water <br />COVE -1 1-1 <br />