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IL <br /> L12,-June,1998 <br /> AOE-NC Project No. 98-039$ <br /> Page 6 of 7 <br /> L (Castle Analytical Laboratory, Lab.No. 14$5 and American Environmental Network Client Project <br /> I.D.No. 10666)and cliairi-of-custody fdrms are,included in Appendices B and.C. <br /> 5.4. SUMMARY AND CONCLUSIONS <br /> Based upon data collected o b l4aitc 198,AfiE concludes the following: <br /> • First encountered ground water is at 12 feet bsg. <br /> Field evidence of petroleum hydrocarbon-impacted soil was observed at depths between 12 <br /> and 20 feet bsg in the former UST pit area. <br /> L • Grab ground water samples collected beneath the former UST area at the site(P1)detected <br /> dissolved petroleum'hydrocarbons as TPH-g,�etlylbenzene and xylenes <br /> • Laboratory and field data suggest that residual petroleum hydrocarbon-impacted soil exists <br /> only beneath the former UST areaat the site. <br /> The State,of California drinking water standard's, adopted bythe Safe Drinking Water Act, <br /> h <br /> have established maximum contaminant levels(+1CLs)for ethyIbenene and"xylenes at 700. <br /> ppb and-1,750-ppb,.respectively. Concentrations ofthe two compounds in the grab ground <br /> Water sample collected from P1 were below the MCLS. <br /> 6.0. RECOMMENDATIONS� <br /> Based upon data collected from.the site,AGE recommends: <br /> • , Performance <br /> " r1rit - #vatradius of the site: <br /> Based upon results of the receptor survey,the site may meet-with CVRWQC$guidelines as <br /> j„ a"ld3 sate.and'may be considered by the PHS-EHD fc <br /> 7.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practiding'in this or similar localities. The findings were based mainly. <br /> L upon analytical results provided by an independent laboratory. Evaluations of the geologic/ <br /> hydrogeologic conditions at the site,for the purpose of this investigation are made from a limited <br /> number of available data points(i.e.grab ground water samples and soil samples) and subsurface <br /> LAdiwncef GeoEnvironme tai Inc. <br /> L _ <br />