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rg- <br /> �. <br /> sw <br /> i <br /> a � <br /> x <br /> Fwcu'rIVii SUMMARY, Continued <br /> Conclusions <br /> Based on the information gathered during this investigation, we present the following conclusions. <br /> The soil prof h: at the sire consists of black, organic sandy clay to a depth of S feet, underlain <br /> by brown, silty sands to 10 feet, underlain by poorly graded sands to 20 feet, silty sands and <br /> sandy silts to 60 feet, and poorly graded sands at 60 feet. <br /> Concentrations of petroleum hydrocarbons were indicated by analysis of soil samples from all <br /> soil borings. The highest concentrations of all compounds were detected in MW-2 (boring B-2) <br /> between 20 and 45 feet. Low to trace levels of compounds were detected in all other soil <br /> samples analyzed to a depth of 60 feet. The lateral extent of soil contamination was not defined. <br /> . The concentration of barium detected in the TCLP extract from the sample collected from MW-2 <br /> (boring B-2) is below regulatory levels for toxicity as set forth in 40 CFR 26I.24. The highest <br /> concentration of total lead detected (9 mg/kg) does not exceed the current TTLC value. <br /> . The ground-water gradient as determined from elevations of the ground-water surface in June, <br /> 1991,was approximately 0.0017 feet per foot toward the east-southeast. <br /> . The results of chemical analysis of water samples indicated coliform concentrations in excess of <br /> MCLS as identified in Section 64423, Title 22 of the CCR. <br /> . The results of chemical analysis for water samples analyzed for each of the four monitoring wells <br /> indicated high concentrations of petroleum hydrocarbons for all samples analyzed. The lateral <br /> extent of affected ground water was not determined. <br /> Yours faithfully, <br /> SSB ENVIRONMENTAL CONSULTANTS, INC. <br /> Jason R. Paul <br /> Project Geologist <br />