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i <br /> WALLACE - KUHL September 23, 1996 <br /> &ASSOCIATES INC. <br /> Ms Jan Cordim <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 293 8 03 <br /> Dear Ms Cordini, <br /> Recent ground water elevation measurements were obtained from the three on-site <br /> I monitoring wells on August 16, 1996, 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 northwesterly direction with <br /> an estimated hydraulic gradient of 0 004 feet/foot (Plate 2) <br /> t Geotechnical Engineering Ground water samples were also obtained from the three on-site monitoring wells <br /> Engineering Geology <br /> on August 16, 1996 Prior to purging and sampling, the water level in each well <br /> was measured with an electronic water level indicator and checked for visual signs <br /> f 1 Environmental Consulting of free product using new, clean, disposable polyethylene bailers No free product, <br /> ` Remediation Services sheen or odor was observed in the monitoring wells Prior to sampling, <br /> approximately three well volumes of water were removed from the wells by using a <br /> ` Construction Inspection 31/4-inch diameter polyvinyl chloride(PVC) bailer and sampling equipment was <br /> h <br /> Materials Testing <br /> cleaned with a solution of tnsodium phosphate and water to minimize the potential <br /> I for cross-contamination between the wells Ground water samples were then <br /> collected using new polyethylene disposable bailers and decanted into appropriate <br /> sampling containers provided by the analytical laboratory The samples were <br /> 3C50 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 /> � CA 95691 analysis of Total Petroleum Hydrocarbons (TPH) as gasoline, diesel, and motor oil <br /> Fax 916 372 2565 <br /> 916 372 1434 <br /> Recycled papa <br />