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w 5.4 GROUNDWATER SAMPLING fag` 6 <br /> Prior to,during and after groundwater sampling,water level measurement data were collected from <br /> all monitoring wells on site(MW-1 through MW-6). During well purging,from three to seven well <br /> volumes from each existing well(MW-1 through MW-3)were evacuated by using a 2-inch diameter <br /> submersible pump,allowing the pH,specific conductivity,temperature and sediment content of the <br /> water to stabilize. The pumps and hosing were cleaned between wells using an alconox wash, a <br /> lionized water rinse and a dionized spray between wells. Groundwater samples were collected <br /> using disposable bailers for each well. Only MW-6 was pumped dry during purging and was <br /> sampled after approximately two hours. <br /> 1 <br /> ;. An electronic oil/water interface probe was used to evaluate the wells for free product,upon <br /> _ completion,and at 7 and 14 days following completion. No free product,sheens or odors were <br /> observed in the new monitor wells or existing /s. The <br /> g wel' groundwater samples were sent under <br /> chain-of-custody to state-certified Chromalab Inc. of San Ramon,California. The purged water was <br /> stored on-site in 55-gallon DOT drums pending laboratory analysis for appropriate disposal. <br /> s <br /> s <br /> k <br /> i <br /> 1 <br /> r_ <br /> i <br /> i <br /> r 3 <br />