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Umbert Barnum "-IN. November 24, 1990 Page 3 process. As contaminated soil was removed from the hole by the rotating action of the auger flyte, soil was smeared against the side wall of the boring. Because of the depth of sample collection, only limited lateral pressure could be used to obtain a "clean" soil sample from the side wall of the borings. As a result, contaminated soil brought to the near surface by the augering process was unavoidably included in each of the auger samples. The analytical results presented in Table 1 should therefore be considered as maximum values. Since the initial oil and grease concentration found in the side wall of the former excavation was 19.900 mg/kg; it is reasonable to argue that the majority of the. contaminated material has now been removed and that the minor amount of contamination remaining poses a threat to neither the local groundwater nor to public health. As a result Murray&Associates concludes that no further remediation work needs to be accomplished at the site, and that the cost associated with additional remedial work would far exceed the incremental environmental health benefits achieved. 1� li J.E. Tab!e 1 i Analytical Results -Soil Samples { TPH Oil and Collection diesel Benzene Toluene Ethyl Benzene Xylene %Dmase Borings No. �Depth Smpla;e} (Udg) u�gZ (PIZ&;) (ucli:e) (uelFel AH-1 7 feet — ND'• ND ND 5 630 AH-2 7 feet — ND ND ND 19 320 AH-3 7 feel ND ND 22 110 690 A14-4 7 feet ND ND 37 190 300 A14-5 :feet ND 4 12 63 48 SS 1' 20 ND — 590 'Composiied sample. **Not detected. Water Wells --— - ---The-analytical-results of-the-water-samples-collected-from the three monitoring wells were not available for inclusion in this report. These analyses will be forwarded to the San . Joaquin County Department of Health as soon as they become available. .