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JKI I K L t 1 r-4 r c L Lo <br />I SITE CHAIL&CTERISTICS <br />at 3242 South El Dorado Street <br />Cove Contractors landfill is located in San Mount <br />and Meridian, the site is in <br />in Stockton (plate 1.1). According to thDiablo Base <br />of section 23, Township I North, Range 6 East. <br />the eastern half of the southeast quarter <br />ONSHW OF SITE, GROUND WATER, AND SURFACE WATER <br />1.1 RELATI <br />The Cove Contractors landfill is approximatel580 feet long in the north -south direction <br />y <br />7()o feet wide in the east -west direction. The bottom elevation of waste at the landfill <br />and maximum depth of approximately 20 feet below mean sea level <br />is variable with an apparent ariable anis not d capped. <br />ranges from natural grade <br />(-20 feet, msl). The top elevation of the landfill is v <br />[+ 16 feet, mil to approximately -9 feet, msl. The landfill <br />Duck Creek/Walker slough parallels the south side of the landfill and is approximately 40 <br />The bottom of Df <br />etCmsl, <br />reek/Walker Slough appears to be <br />feet from the landfill perimeter. based on visual observations <br />approximately 20 feet below natural grade, or -5, <br />Flood insurance Rate Maps published by the Federal Emergencyed Manh <br />ement Zone B, Agency the <br />(FEMA , 1983) indicate that the Cove Contractors landfill is locatwin <br />100-year fl000d plain, defined as land areas protected by levees from the base flood. <br />he north side of the landfill. This pond is <br />A small, intermittent, onsite and is located on t bottom may be at or near the <br />. topographically low with respect to the landfill and the pond <br />bottom of the waste. <br />Zone III, discussed in Section <br />The ground water in the uppermost water bearing unit ( <br />1.3.2) was at an elevation of approximately -17 feet, msl during August, 1988. Portions Of <br />to below the potentiometric surface orales <br />fr <br />the landfill floor appear to have been excavated waste mate <br />to Plate 1.19, Zone 11 Isopach). The boring log from MW -3 indicates <br />present below the potentiometric surface. Based ce <br />lvatis,waternthe onsite <br />pond appears to represent the potentiometric surfain Zone <br />located between the landfill and <br />Based on hydraulic information for MW -5 and MWA ra water <br />Duck Creek/Walker Slough (refer to Cross Section, Plate . 1.16), the uppermost <br />COVE -1 1-1 <br />