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1 <br /> AEGIS ENVIRONMENTAL, INC <br /> STANDARD OPERATING PROCEDURE <br /> RE GROUND WATER SAMPLING <br /> SOP-1 <br /> GROUND WATER SAMPLING <br /> A minimum of 24 hours following well development, and after water <br /> levels are allowed to stabilized in the well, three to five wetted <br /> casing volumes of liquid are removed from each well by bailing with <br /> a laboratory-cleaned teflon bailer. A liquid sample is then <br /> collected from each well with a laboratory-cleaned, dedicated <br /> bailer. Each sample is appropriately labeled and stored on ice <br /> from the time of collection through the time of delivery to the <br /> laboratory. Ground water samples are transported to the laboratory <br />' and analyzed within the EPA-specified holding times for the <br /> requested analyses. <br /> If free petroleum product is observed in a well, the thickness of <br /> the product layer would be measured from a bailer. A sample of the <br /> product would be collected with a laboratory-cleaned teflon bailer <br />' and transferred to an appropriate sample container and subsequently <br /> submitted to a California-certified laboratory for fuel fingerprint <br /> analysis, if required. <br /> SOP-1/Oct 1990 <br /> 1 <br />