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DEC 31 2002 11 : 10AM GREGG DRILLING 92531.30302 p. 2 <br /> *E G G <br /> E <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 chemi- <br /> cal parameters as conductivity, pH, temperture <br /> and salinity. <br /> A push-type groundwater sampler with a <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 /> i type and density. The smaller sampler can <br /> aF. generally be pushed to greater depths. <br /> The groundwater samplers have a retrievable <br /> stainless steel screen. This allows for multiple <br /> depth groundwater sampling utilizing the same <br /> penetration hole. If low recharge occurs or <br /> longer term monitoring is required 3/4 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 /> i <br /> vai. The sampler push rod is then retracted <br /> . exposing the fitter screen. Groundwater flaws <br /> hydrostatically from the formation into the sam- <br /> pler. <br /> 1S H r <br /> For floating hydrocarbons a small diameter <br /> -bailer(314 inch or 1/2 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, 1/4 <br /> tubing can be lowered and a peristaltic pump <br /> can be used to retrieve the sample up to a <br /> r depth of 35 feet. <br /> Las Angeles(corporate)-San Francisco• Houston •Charlston <br /> Vancouver-Salt Lake City• New Jersey <br /> Tel:(562)427-6899•Fax(562)424-2329•Website:WWW.9mggdril1ing,com <br />