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i <br /> Mr Kenneth Earnest <br /> Ultramar Inc <br />. May 21, 1996 <br /> Page 3 <br /> TPH as gasoline ranged from 2 2 (SB-3) to 5,700 (SB-6) mg/kg, some of the laboratory results <br /> reported as TPH as gasoline were noted by the laboratory to be not typical gasoline, but rather <br /> weathered gasoline, which is consistent with previous analytical results at this site Detectable <br /> concentrations of TPH as diesel ranged from 2 (SB-2) to 17,000 (SB-3) mg/kg <br /> Conclusions and Recommendations <br /> Based on review of the analytical and soil type data gathered to date, the SVE system has been more <br /> successful to removing hydrocarbons from the sand/silt units than the silt/clay units It has been <br /> Delta's experience in cases containing areas with clay/silt units, the remedial alternative of excavation <br /> with disposal of the soil is neither feasible or cost effective given the depth (60 feet) of impacted <br /> silt/clay units and the site being an active service station owned by a second party <br /> Based on these observations, the amount of hydrocarbons removed from the site, the maximum <br /> benzene concentrations reported in soil during this investigation were 18 mglkg, and that the <br /> hydrocarbons remaining in the soil may not pose a significant threat to human health Delta <br /> recommends that the data collected to date be summarized, and the site be evaluated using a risk <br /> based corrective action to determine if closure or further corrective action is warranted <br />. Remarks and Sigpatures <br /> The interpretations contained in this report represent our professional opinions, and are based to part <br /> on information supplied by the client These opinions are based on currently available information <br /> and are arrived at in accordance with currently accepted hydrogeologic and engineering practices at <br /> this time and location Other than this, no warranty is implied or intended <br /> We recommend that copies of this report be forwarded to <br /> Ms Linda Turkette Mr James B Maughan <br /> Environmental Health Division California Regional Water Quality <br /> Public Health Services Control Board, Central Valley Region <br /> San Joaquin County 3443 Routier Road <br /> Post Office Box 2009 Sacramento, California 95827 <br /> Stockton, California 95201 <br /> • <br />