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All the soil samples which were analyzed for the Oxygenates had <br /> no detectable concentrations of the Oxygenates, the detectable <br /> limit are noted on the Laboratory Data Sheets. The Laboratory <br /> Data Sheets with Chain of Custody are contained in Appendix C. <br /> :. SUMKARY, CONCLUSIONS AND RECOMMENDATIONS <br /> The soil in the upper five feet have minor concentrations of <br /> hydrocarbon contamination. No detectable contamination for the <br /> Oxygenates was found in the analyzed soil samples. This <br /> hydrocarbon contamination most likely is from the prior use of <br /> the property as an automobile dismantling and wrecking operation <br /> and not from the former UST. <br /> The groundwater had less than 1 ppm TPHG and 20 ppb Benzene <br /> contamination. The groundwater sample from MW--3 had 5.6 ppb of <br /> MTBE contamination. The remaining groundwater samples had no <br /> detectable concentrations, ie < 5 ppb, of oxygenates. <br /> The calculated groundwater gradient is N22°W or 338° . <br /> =a <br /> JPCA recommends that it maybe prudent to remove the first five <br /> feet of soil from the former UST area as a precaution. <br /> E; <br /> `A JPCA further recommends four quarters of groundwater sampling and <br /> gradient determinations. After the four quarters of data have <br /> been compiled and analyzed, closure of the site file may be <br /> E s possible. <br /> This report has been prepared specifically for Edward P. Smith, <br /> =� CFO Piedmont Lumber Co. , with specific application to a hazardous <br /> waste investigation. The report has been prepared with the care <br /> and skill generally exercised by reputable professionals, under <br /> similar circumstances in this or similar localities. No other <br /> ` warranty, either expressed or implied, is made as to the <br /> professional advice presented. <br /> A copy of this report is being mailed to Bruce Askansas, REHS, <br /> SJCEHD, in accordance with the conditions required for a well <br /> permit application in San Joaquin County. <br /> ai <br /> Sincerely, <br /> C- � <br /> :I <br /> ohn P. Cummings John N. Alt, q?,ED Gip <br /> Principal Epigene 1n i.ona <br /> JOHN !�. ALT <br /> i 7 sL <br /> N° ;136 <br /> CERTIFIED <br /> EN6(N,E F.f?I � <br /> GEOEO, <br /> �P <br />