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OKLUU DRILLING 9253130302 <br /> P- 2 <br /> � GREG <br /> G .IN SITU, INC. <br /> LC�o�e�chnkk�ll and EnvlronmeMai in Situ Testing Contractors <br /> L <br /> GROUND WATER SAMPLING <br /> L <br /> Gregg In-Situs groundwater sampling system <br /> ` provides a means of detelmining such chennl- <br /> L cal parameters as conductNity, pH, temperture <br /> and salinity. <br /> LA Push­type groundwater sampler with a <br /> sealed screen section Is used to collect dis- <br /> crete groundwater sampies: 1.75 and 2 Inch <br /> L samplers are available depending on the soil <br /> type and denslty. The smaller sampler can <br /> generally be pushed to greater depths. <br /> LThe groundwater samplers have a retrievable <br /> stalniess steel screen,. This allows for multiple <br /> depth groundwater sampling udtdng the same <br /> L penetration hole. If low recharge occurs or <br /> longer term monitoring is required 314 Inch <br /> PVC can be Installed using a similar epstem. <br /> LThe groundwater sampler is pushed In the <br /> closed position to the dashed sampling Inter- <br /> vat. The sampler push rod is then retracted <br /> L exposing the Nor sawn. Gradwater flows <br /> hydrastaticalty from the formation into the sam- <br /> pler. <br /> LFof f;oating hydrocarbons a small diameter <br /> beher(314 Inch or 112 Inch) Is lowered through <br /> L the hok w push rods; Into the screen section <br /> for sample Collection. .For sampling of larger <br /> volume non-voeitlte groundwater samples, 1/4 <br /> tubing can be lowered and a peristaft pump <br /> L oan be used to retrieve the sample up to a <br /> depth of 35 feet. <br /> L <br /> Los Angeles(corpOrata)•Sen Franoboo Houston •Chadston <br /> Vwxx Aw•Salt take City-Naw Jassy . <br /> LTei:(W)427-OW•Fac(rfe2)424 •YY,6al*,wwwawrwping.com <br /> L <br />