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W� <br /> �. brought in to level the property. Incorporated in this material is a variety of debris <br /> including wood, metal, bricks and gravel. <br /> 2) Hydrology- The first ground water was encountered at about 12.5 feet. The water i <br /> bearing strata composed of clayey sand, sandy clay or clayey silt, is about 2 feet <br /> thick, extending from about 13 to 15 feet. The regional ground water gradient is to <br /> the north, however due to leakage of the irrigation pipe near the north side of the <br /> N' property, the flow of this shallow ground water is to the south. <br /> 3) Soil Contamination - Soil contamination is restricted to a narrow horizon above the <br /> „. ground water (from about 12.5 up to 9 feet). The contamination is located in a <br /> circle around the previous fuel tank location, indicating that these tanks were <br /> probably the source. Analytical data indicatesthat there is only low levels soil of <br /> contamination. It is possible that natural microbial degradation has already <br /> significantly reduced the levels contamination in the sedimented surrounding the <br /> tank location. Soil analytical data is summarized in Table '.. <br /> 4) Water Contamination - Ground water contamination a!so exists only in a local plume <br /> around the previous tank location. Levels of contamination are fairly low, with <br /> xylene having the highest concentration and the widest distribution. Even though the <br /> levels of contamination are not high, they are above state allowable limits for ' <br /> drinking water. Ground water analytical data is summarized in Table 2. The state <br /> -• allowable limits for the compounds detected in the ground water are listed in Table 3. <br /> t <br /> Project :History <br /> 811 1 Made field version of the site map <br /> i 8113 Prepared field site map to make a drafted copy from <br /> h� 8121 Started drafting site map t <br /> to 8/24 Started writing property investigation proposal and finished drafting site map <br /> t" 8/25 Continued writing proposal <br /> 1 <br /> 8/26 Finished writing proposal and edited it <br /> 8127 Hand delivered proposal draft to Ben Curran and Rudy Dell'Osso, had a short <br /> — meeting; made blue print copies of site map <br /> 9/1 Hand delivered proposal to San Joaquin County Health District, discussed the <br /> project with Harlin Knoll c� <br /> 9/14 Prepared proposal,addendum describing changes to proposal <br /> 9123 Made additional changes - slight modification of the Addendum, kept original date <br /> 9/24�,)Hand delivered Addendum changes to the county and picked up drilling permit <br /> 9/28 Started fieldwork; drilled borings #.1-3, condo^tad geological investigation, <br /> collected soil and water samples <br /> 3 <br />