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Groundwater Sampling <br /> (GWS) <br /> Gregg In Situ, Inc conducts groundwater sampling using a Hydropunce type groundwater <br /> sampler, Figure GWS The groundwater sampler has a retrievable stainless steel or disposable <br /> PVC screen with steel drop off tip This allows for samples to be taken at multiple depth intervals <br /> within the same sounding location In areas of slower water recharge, provisions maybe made to <br />' set temporary PVC well screens during sampling to allow the drill rig to advance to the next <br /> sample location while the groundwater is allowed to infiltrate <br />' The groundwater sampler operates by <br /> advancing 1 $/ inch hollow push rods with the <br />' filter tip in a closed configuration to the base of <br /> the desired sampling interval Once at the <br /> desired sample depth, the push rods are <br />' retracted, exposing the encased filter screen <br /> and allowing groundwater to infiltrate Pre�lousiy <br /> hydrostatically from the formation into the inlet Sampie(i <br /> y y In#enra! Perched <br />' screen A small diameter bailer — Groundwater <br /> (approximately Y2 or % Inch) is lowered — <br /> — <br /> . through the push rods into the screen section — <br />' for sample collection The number of <br /> downhole trips with the bailer and time <br />' necessary to complete the sample collection Bailer <br /> at each depth interval is a function of sampling <br /> protocols, volume requirements, and the yield <br />' characteristics and storage capacity of the <br /> formation Upon completion of sample <br /> collection, the push rods and sampler, with the <br /> rexception of the PVC screen and steel drop Aquifer <br /> off tip are retrieved to the ground surface, 9 <br /> decontaminated and prepared for the next <br />' sampling event <br /> ri <br /> L4 � <br /> .% <br />' Figure GWS <br /> For a detailed reference on direct push groundwater sampling, refer to Zemo et a1 , 1992 <br /> 0 EG 2726 Walnut Avenue Signal Hili California 90755 Phone (562)427-6899 Fax (562)427-3314 <br /> J! <br /> Web Site www greggdnlling com Email info@greggdnlling corn <br />' Additional locations in Charleston Houston Palo Alto Salt Lake City San Francisco Vancouver <br /> 1 <br />