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SOILS SAMPLING AND TESTING
<br /> SWIFT TRANSPORTATION r r._'.ACE HUFE&ASSOCIATES I'll
<br /> WKA No. 1004.37
<br /> January 29, 1991
<br /> Page 2
<br /> Laboratory Testina
<br /> Laboratory test results for sample Tl, obtained from beneath the 7,500-gallon tank, revealed a TPH
<br /> as diesel concentration of 17 mg/kg and WET lead concentrations of 0.18 mg/L. Test results for
<br /> sample T2, also obtained from beneath the 7,500-gallon tank, revealed a TPH as gasoline
<br /> concentration of 2.9 mg/kg; a TPH as diesel concentration of 21 mg/kg; ethyl benzene and total
<br /> xylenes concentrations of 0.0081 and 0.092 mg/kg, respectively; and, a WET lead concentration of
<br /> 0.19 mg/L.
<br /> Test results for sample P2, obtained from beneath the product line for the 7,500-gallon tank,
<br /> revealed a TPH as gasoline concentration of 250 mg/kg; a TPH as diesel concentration of 8,500
<br /> mg/kg; a WET lead concentration of 0.05 mg/L; benzene, toluene, ethyl benzene, and total xylenes
<br /> concentrations of 23, Oal, 0.24, 0.47 mg/kg, respectively. Test results for sample P4, also obtained
<br /> from beneath the fill line of the 7,500-gallon tank, revealed TPH as diesel concentration of 97
<br /> mg/kg and a WET lead concentration of 0.02 mg/L.
<br /> Sample T3, obtained from beneath. the 10,000-gallon diesel tank, contained non-detectable
<br /> concentrations of TPH and BTX&E. Test results for sample T4, also obtained from beneath the
<br /> 10,000-gallon tank, revealed a TPH as diesel concentration of 270 mg/kg.
<br /> Test results for sample Pl, obtained from beneath the product line for the 10,000-gallon tank,
<br /> revealed a TPH as diesel concentration of 2,000 mg/kg; benzene, toluene, ethyl benzene, and total
<br /> xylenes concentrations for this sample were 0.17, 0.033, 2.1, and 0.86 mg/kg, respectively. Test
<br /> results for sample P3, also obtained from beneath the product line for the 10,000-gallon tank,
<br /> revealed a TPH as diesel concentration of 330 mg/kg.
<br /> Complete laboratory test results and chain-of-custody documentation are attached.
<br /> Conclusions and Recommendations
<br /> Our observations during tank removal and the laboratory analyses indicate that the subsurface soils
<br /> have been contaminated with gasoline and diesel in the vicinity of the tank and product line
<br /> excavations.
<br /> We recommend that the San Joaquin County Public Health Services be notified of our findings.
<br /> A site-specific workplan for a proper site characterization should then be prepared, as required by
<br /> the regulatory agencies, so that an appropriate, cost-effective remedial treatment can be
<br /> implemented for the property.
<br /> Limitations
<br /> The above conclusions are based on our assessment of conditions indicated to exist as of the date
<br /> of our field work, January 14, 1991. The results of this investigation do not preclude the possibility
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