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WALLACE • KUHL January 28, 1997 <br /> fir ASSOCIATES INC <br /> Ms Jan Cordint <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 /> WKANo 2938 03 <br /> Dear Ms Cordim, <br /> Recent ground water elevation measurements were obtained from the three on-site <br /> monitoring wells on January 3, 1997, historic ground water elevation data is <br /> provided in Table 1 Based on current ground water elevation measurements, the <br /> ground water flow beneath the subject property is in a southeasterly direction with <br /> ' an estimated hydraulic gradient of 0 008 feet/foot (Plate 2) <br /> ` Geotechnical Engineering Ground water samples were also obtained from the three on-site monitoring wells <br /> on January 3, 1997 Prior to purging and sampling, the water level in each well was <br /> Engineering Geology <br /> measured with an electronic water level indicator and checked for visual signs of <br /> Environmental Consulting free product using new, clean, disposable polyethylene bailers No free product, <br /> ` sheen or odor was observed in the monitoring wells Prior to sampling, <br /> Remediation Services <br /> approximately three well volumes of water were removed from the wells by using a <br /> ` Construcnon Inspection 3'/4-inch diameter polyvinyl chloride (PVC) bailer and sampling equipment was <br /> ! cleaned with a solution of trisodium phosphate and water to minimize the potential <br /> j Materials Testing <br /> for cross-contaminatton between the wells Ground water samples were then <br /> (i collected using new polyethylene disposable bailers and decanted into appropriate <br /> sampling containers provided by the analytical laboratory The samples were <br /> 3050 Industrial Blvd immediately placed in an ice-chest containing ice and submitted under chain-of- <br /> West Sacramento custody to a California Department of Health Services certified laboratory for <br /> l� CA 95691 analysts of Tolal Petroleum Hydrocarbons (TPH) as gasoline, diesel, and motor oil <br /> using modified EPA method 8015, and Benzene, Toluene, Ethylbenzene, and Total <br /> Fax 916 372 2565 <br /> 916 372 1434 <br /> Recycled paper <br />