Laserfiche WebLink
4 <br /> r ' <br /> Lambert Barnum <br /> November 24, 1990 <br /> Page 3 <br /> i <br /> process. As contaminated soil was removed from the hole by the rotating action of the <br /> auger flyte, soil was smeared against the side wall of the boring. Because of the depth of <br /> sample collection, only limited lateral pressure could be used to obtain a "clean" soil <br /> sample from the side wall of the borings. As a result, contaminated soil brought to the <br /> near surface by the augering process was unavoidably included in each of the auger <br /> samples. The analytical results presented in Table 1 should therefore be considered as <br /> maximum values. Since the initial oil and grease concentration found in the side wall of <br /> the former excavation was 19,900 mg/kg; it is reasonable to argue that the majority of the <br /> contaminated material has now been removed and that the minor amount of contamination <br /> remaining poses a threat to neither the local groundwater nor to public health. As a result <br /> Murray&Associates concludes that no further remediation work needs to be accomplished <br /> at the site, and that the cost associated with additional remedial work would far exceed the <br /> incremental environmental health benefits achieved. <br /> Table 1 <br /> Analytical Results-soil Sutnples <br /> TPH Oil and <br /> Collection diesel Benzene Toluene Ethyl Dcnzcnc Xylene Grease <br /> Bonne;No. Death finelk¢l _(ueJke) k L NOW (UPA lAli- r <br /> 1 7 feet — ND-- ND ND 5 630 <br /> AH-2 7 feet — ND ND ND 19 320 ` <br /> AH-3 7 feel — ND ND 22 110 690 <br /> AH-4 7 feet ND ND 37 190 300 <br /> 'i <br /> 3 AH-5 7 feet ND 4 12 63 48 <br /> SST — 20 <br /> ND 590 <br /> •Camposhed sample. <br /> _i **Not detected. <br /> i <br /> Water Welts <br /> The analytical results of the water samples collected rrom the three monitoring wells were <br /> not available for inclusion in this report. These Ea'alyses will be forwarded to.the San <br /> Joaquin County Department of Health as soon as they become available. <br /> t <br /> , 3 <br /> h <br /> y <br />