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UiY <br /> . Working To Restore Nature <br /> LABORATORY RESULTS <br /> Laboratory analyses detected dissolved petroleum hydrocarbon constituents in samples collected <br /> from wells MW 1, MW2, MW3 and MW5 Water samples collected from wells MW4, MW6, <br /> MW7, and MW8 contained no analytes at or above the method detection limits. Only wells <br /> MW3 and MW5 contain dissolved hydrocarbon constituents significantly above respective <br /> Primary Maximum Contaminant Levels (MCLs, Table 2). A review of historical analytical data <br /> indicates a continuing decrease of contaminants beneath the site since groundwater monitoring <br /> began December 13, 1990. Table 2 summarizes groundwater analytical data Attachment 2 <br /> contains laboratory data sheets and chain-of-custody documentation <br /> RECOMMENDATIONS <br /> Based upon historical analytical results, RESNA recommends the following groundwater <br /> monitoring and sampling schedule <br /> o Quarterly monitoring of depth to groundwater from each well to detect fluctuations in <br /> shallow groundwater, <br /> O Quarterly sampling of downgradient wells MW I, MW2, MW4 and MW8 to detect plume <br /> migration, <br /> O Semi-annual sampling of impacted wells MW3 and MW5 to track dissolved <br /> concentrations; <br /> o Annual sampling of upgradient/crossgradient wells MW6 and MW7 <br /> If you have any questions or comments regarding this report, please contact John Lane at (209) <br /> 838-3507. <br /> Respectfully, <br /> RESNA Industries Inc. <br /> P � - <br /> J n P Lane ���� ® G��(0 <br /> o�ect Geologist <br /> GR"EGQRY P <br /> No. 5023 <br /> Gregory P. Stahl <br /> CA Registered Geologist No 5023 'TF� ' <br /> Attachments <br /> PC: Mr Pat Riddle <br /> Mr. Ted Knowles <br /> 1500381QP.TERLYI4-94-SSR F'NL 2 <br />