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tJtC �11 2002 11 : 10RM GREGG DRILLING 9253130302 <br /> P.2 <br /> .r `*now <br /> .�� Geotechnical and Environmental in Situ Testing Contractors <br /> GROUND WATER SAMPLING <br /> Gregg In-Situ's groundwater sampling system <br /> provides a means of determining such cherni- <br /> cal parameters as conductivity, pH, temperture <br /> and salinity. <br /> A push-type groundwater sampler with a <br /> .r <br /> sealed screen section is used to collect dis- <br /> crete groundwater samples. 1.75 and 2 inch <br /> samplers are available depending on the soil <br /> type and density. The smaller sampler can <br /> generally be pushed to greater depths. <br /> The groundwater samplers have a retrievable <br /> -� stainless steel screen,. This allows for multiple <br /> de <br /> groundwater depth g afar sampling utilizing the same <br /> penettation hole. If low recharge occurs or <br /> _ ow longer term monitoring is required 314 inch <br /> PVC can be installed using a similar system. <br /> The groundwater sampler is pushed in the <br /> closed position to the desired sampling inter- <br /> vat. The sampler push rod is then retracted <br /> exposing the fitter screen. Groundwater flows <br /> hydrostatically from the formation into the sarn' <br /> pier. <br /> For floating hydrocarbons a small diameter <br /> bailer(314 inch or 112 inch) is lowered through <br /> the hollow push rods, into the screen section <br /> for sample collection. For sampling of larger <br /> volume non-volatile groundwater samples, 114 <br /> tubing can be lowered and a peristaltic pump <br /> can be used to retrieve the sample up to a <br /> depth of 35 feet. <br /> `r Los Angeles(coporate)•San Francisco• Houston •Charlston <br /> Vancouver•Salt Lake City•New Jersey <br /> Tel:(562)427-6699•Pax(562)424-2329•Website:www.greggdrilling.com <br /> MEr <br /> r <br />