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sd ,"P'l <br /> . ISR-E. <br /> a..a.g X��.I— <br /> ISM�Fmn"*X.sem.cw <br /> P"e"H4 IS0003.00 <br /> N8.S <br /> installation, the impact to groundwater was likely related to drilling activities. During the second <br /> round of sampling (September 13, 1991)three samples were collected and analyzed by three separate <br /> and independent laboratories; FGL Environmental (retained by San Joaquin County); Columbia <br /> Analytical Services (retained by Emcon) and Alpha Environmental, retained by Nor-Cal. Two <br /> laboratories reported no BTEX constituents at or above MDL's; and the laboratory retained by San <br /> Joaquin County reported no BTEX or TPHG at or above MDL's. A third round of sampling, <br /> conducted on January 27, 1992 reported no petroleum hydrocarbon analytes were present at or above <br /> MDL's. <br /> Benzene is the analyte of most concern in our groundwater. Since benzene was not detected during <br /> the September 13, 1991 sampling round in two of three samples and was not detected at or above <br /> MDL's in the January 27, 1992 sampling round RESNA believes that groundwater impact was <br /> related to well installation activities and groundwater is not continuing to be degraded by benzene <br /> or any other petroleum hydrocarbon analyte. Continuing degradation is not probable because <br /> confirmation samples collected from the sidewalls and floor of the excavation indicate that the <br /> impacted soils have been removed. The site is also paved thus mitigating the potential for downward <br /> migration due to leaching of any unidentified residual contamination. No further action is <br /> recommended. <br /> If you have any questions or comments please call our office at (209) 838-3507. <br /> Respectfully, <br /> RESNA Industries, Inc. <br /> r <br /> Lois Frantz <br /> Staff Geologist <br /> Gregory P. Stahl <br /> CA Registered Geologist No. 5023 <br /> Attachments <br /> PC: Mr. Peter Ruhkala, Nor-Cal Beverage <br /> Ms. Beth Thayer, CRWQCB - <br /> Mr. Pat Riddle <br /> • <br /> pAR-0593.FNL <br />