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WALLACE• KUHL January 5, 1998 <br /> &ASSOCIATES INC. <br /> Ms Jan Cordini V <br /> U S RENTALS <br /> 1581 Cummins Road, Suite 155 <br /> Modesto, California 95358 <br /> Quarterly Ground Water Monitoring <br /> And Sampling Report <br /> 1444 MARIPOSA ROAD <br /> Stockton, California 95205 <br /> WKA No 2938 03 <br /> Ground water elevation measurements were obtained from the three on-site <br /> monitonng wells on November 12, 1997 (Table 1) Based on current ground water <br /> elevation measurements, the ground water flow beneath the subject property is to a <br /> easterly direction with an estimated hydraulic gradient of 0 005 feet/foot (Plate 2) <br /> !� Ground water samples were also obtained from the three wells on November 12, <br /> 1997 Prior to purging and sampling, the water level in each well was measured <br /> GtOteLlimc.d Fngineering with an electronic water level indicator and checked for visual signs of free product <br /> i using new, clean, disposable polyethylene bailers No free product, sheen or odor <br /> Engmevring creotog; was observed in the monitoring wells Pnor to sampling, approximately three well <br /> -� Fnvttnnn,ental Camuttlng volumes of water were removed from the wells by using a 31/4-inch diameter <br /> polyvinyl chloride (PVC) bailer and sampling equipment was cleaned with a <br /> Rcmedtatton Services <br /> solution of trisodium phosphate and water to minimize the potential for cross- <br /> , Comtructton Inspection contamination between the wells Ground water samples were then collected using <br /> new polyethylene disposable bailers and decanted into appropriate sampling <br /> M ttenaf,Testing containers provided by the analytical laboratory The samples were,immediately <br /> placed in an ice-chest containing ice and submitted under chain-of-custody to a <br /> California Department of Health Services certified laboratory for analysis of Total <br /> 350 Industrial Blvd Petroleum Hydrocarbons (TPH) as gasoline, diesel, and motor oil using modified <br /> E EPA method 8015, Benzene, Toluene, Ethylhenzene, and Total Xylenes (BTEX) <br /> West 5 icramenro <br /> using EPA method 602, and Ethanol, Tert-Butanol, Me1hy1 Cert-Butyl Ether, Di- <br /> isopropyl <br /> i- <br /> CA 95691 iso ro 1 Ether, Eth 1 tert-But 1 Ether, and Tert Am 1 methyl Ether (oxygenates) <br /> P PY Y Y Y Y ( Yg ) <br /> 916 372 1434 <br /> Fax 916 372 2565 <br /> Rerrrled l�rr , <br />