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I <br /> 1 <br /> March 24, 1998 <br /> Ms Tan Cardini <br /> T <br /> U S RENTALS <br /> 1581 Cummins Road, Suite 155 <br /> Modesto, California 95358 <br /> Quarterly Ground Water Monitoring 1g9g <br /> And Sampling ReportkA <br /> ApR <br /> 1444 MARIPOSA ROAD N� R�GVCL <br /> Stockton, California 95205 EN ?�_g SIS <br /> WKA No 2938 03 <br /> Ground water elevation measurements were obtained from the three on-site monitoring wells on <br /> February 25, 1998 (Table 1) Based on current ground water elevation measurements, the ground <br /> water flow beneath the subject property is in a southeasterly direction with an estimated <br /> hydraulic gradient of 0 004 feet/foot (Plate 2) <br /> • amles were also obtained from the three wells on February 25, 1998 Prior to <br /> Ground waters )? �3' <br /> purging and sampling, the water level in each well was measured with an electronic water level <br /> indicator and checked for visual signs of free product using new, clean, disposable polyethylene <br /> bailers No free product, 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 3'/a-inch <br /> diameter polyvinyl chloride (PVC) bailer and sampling equipment was cleaned with a solution of <br /> trisodium phosphate and water to minimize the potential for cross-contamination between the <br /> wells Ground water samples were then collected using new polyethylene disposable bailers and <br /> decanted into appropriate sampling containers provided by the analytical laboratory The <br /> samples were immediately placed in an ice-chest containing ice and submitted under chain-of- <br /> custody to a California Department of Health Services certified laboratory for analysis of Total <br /> Petroleum Hydrocarbons (TPH) as gasoline using modified EPA method 8015, Benzene, <br /> Toluene, Ethylbenzene, and Total Xylenes (BTEX)using EPA method 602, and Ethanol, Tert- <br /> Butanol, Methyl tert-Butyl Ether, Di-isopropyl Ether, Ethyl tent-Butyl Ether, and Tert Amyl <br /> methyl Ether, Methanol(oxygenates) using EPA Method 8260B A clean "travel blank" of <br /> distilled water was transported along with the water samples for the purposes of detecting cross- <br /> contamination from field activities All water removed during purging operations was placed in <br /> sealed, labeled 55 gallon drums and stored on-site <br /> `dW <br /> WALLACE KUHL <br /> Er ASSOCIATES INC <br /> I{eryded paper <br />