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Wm. J. Hunter & Associates 2220 Loma Vista Dr. <br /> Registered Geologists °=t�. to Sacramento, CA 95825 <br /> 9 9 :-, t 4 L HEAL I'll 916 972-7941 <br /> Petroleum& Mineral Appraisers ��1�' ( ) <br /> FAX (916) 972-1683 <br /> Qu AUG 30 F 2: 28 <br /> August 29, 1996 <br /> Linda Turkatte, Sr. REHS <br /> San Joaquin County PHS <br /> Environmental Health Division <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> Ref : Marcils Diesel Service - 2969 Loomis Road, Stockton <br /> Site Code 2015 <br /> The attached report covers work done at the above site by Lush <br /> Geosciences on May 30, 1996 under a WJH approved workplan dated <br /> September 14, 1995 . That workplan proposed the installation of <br /> 411 vent wells to 65-70 ' bgl to evaluate minor soil contamination <br /> encountered during placement of three (3) monitoring wells on the <br /> property in April, 1992 . With the approval of the San Joaquin <br /> County EHD, the scope of work was changed to placing one (1) soil <br /> boring through the site occupied by the former UST' s . The field <br /> work was done under the supervision of Bill Welter of Lush <br /> Geosciences . <br /> The results of the laboratory analyses of the soil samples taken <br /> during field operations is summarized on Table 2, (page 5 of the <br /> report . ) Very high levels of TPH as diesel were measured in cores <br /> taken from 21, to 71' bgl . TPH as gasoline was detected in most <br /> samples, with the highest levels from the sample at 56 ' bgl . <br /> Benzene & toluene were ND in all samples; ethylbenzene was found <br /> in 4 samples, and xylene in 9 . <br /> It is interesting to note that soil samples taken during the <br /> placement of monitoring well #1 did not reveal any TPHg, (Table <br /> 1, page 2, ) and none has ever been detected in groundwater <br /> samples from the 3 wells - (Table 1, page 3 . ) TPH as diesel was <br /> present in soil samples from 36 , to 77, bgl in MW-1, and was <br /> detected in water samples taken 9/92, 6/93, 1/94, & 11/94; the <br /> maximum amount measured was 3 .0 mg/L during the 6/93 sampling <br /> event . <br /> Benzene was not detected in any of the soil samples analyzed from <br /> the three monitoring wells, but was measured at very low concen- <br /> trations in water samples from MW-1 in 6/93, 9/93, & 1/94 . <br /> Toluene was detected in 3 soil samples from MW-1, but not in the <br /> water. Ethylbenzene was detected in 2 soil samples from MW-1, <br /> but never in the water.. Xylene was detected in 3 soil samples <br /> from MW-1, and during the 6/93 groundwater sampling. <br /> The presence of significant concentrations of TPHg in the soil <br /> 1 <br />