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1 <br /> KLEINFELDER <br /> 1 EXECUTIVE SUMMARY <br /> ' Kleinfelder was requested by San Joaquin County to assess the soil for the presence of <br /> petroleum hydrocarbons at two underground storage tank sites at the San Joaquin General <br /> Hospital One of the sites (tank Tl) was in use at the time of the request, but had failed a <br /> ' recent tank test; while the other site (tank 72) had not been used in many years and was <br /> scheduled for closure to allow for construction <br /> This report presents the results of Klemfelder s soil assessment in the vicinity of the two <br /> tank sites. Because the tanks had been installed in the 1940's and accurate drawings of the <br /> tank locations were not available, and the prevalence of utility lines in the general viciruty <br /> ' <br /> of the tanks, a geophysical survey was conducted on September 19, 1991 to locate the two <br /> tanks The geophysical survey indicated the presence of a third tank (13) adjacent to T2 <br /> Based on the findings of the geophysical survey and limited access, one vertical boring was <br /> drilled at each end of Tl, one slant boring was drilled beneath tank T2 and one slant boring <br /> was drilled beneath tank T3 Five soil samples were submitted for quantitative analysis <br /> from the T1 site, and four soil samples were submitted from the T2/T3 site The samples <br /> ' were analyzed for total extractable petroleum hydrocarbons (TPH), purgeable TPH, <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX); ethylene dibromide (EDB), and <br /> total lead <br /> Samples submitted from tank T1 did not contain extractable TPH, purgeable TPH, BTEX, <br /> ' or EDB concentrations above the laboratory reporting limits Lead was detected above the <br /> reporting limit in three of the five samples submitted, however, the concentrations are <br /> below current regulatory requirements Kleinfelder recommends no further assessment of <br /> the soil in the vicinity of tank Tl <br /> The two deepest samples submitted from the two borings at site T2/73 were reported to <br /> contain extractable TPH, purgeable TPH, and lead A low concentration of xylenes was <br /> ' detected in one of the deep samples EDB was not reported in the two deep samples <br /> Lead concentrations were detected in the four samples at concentrations below current <br /> ' regulatory levels. <br /> FR25-91-29 Page 1 of 11 <br /> ' Copyright 1991 Kleinfelder,Inc <br />