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1 <br /> EGG Groundwater Sampling <br /> GWS <br />' Gregg In Situ, Inc conducts groundwater sampling using a Hydropunch® type <br /> groundwater sampler, Figure GWS The groundwater sampler has a retrievable <br />' stainless steel or disposable PVC screen with steel drop off tip This allows for <br /> samples to be taken at multiple depth intervals within the same sounding <br /> location In areas of slower water recharge, provisions may be made to set <br />' temporary PVC well screens during sampling to allow the drill rig to advance to <br /> the next sample location while the groundwater is allowed to infiltrate <br />' The groundwater sampler operates by <br /> advancing 1 % inch hollow push rods <br /> with the filter tip in a closed 'a� <br /> 1 configuration to the base of the 1151 <br /> desired sampling interval Once at the <br />' desired sample depth, the push rods <br /> are retracted, exposing the encased Previously <br /> ed <br /> filter screen and allowing groundwater nte� Perished <br />' to infiltrate hydrostatically from the = = Groundwater <br /> s <br /> formation into the inlet screen A small <br /> diameter bailer (approximately '1/2 or g/4 <br />' inch) is lowered through the push rods <br /> into the screen section for sample <br /> i � <br /> collection The number of downhole P a1er a <br /> trips with the bailer and time <br /> necessary to complete the sample r n u <br /> collection at each depth interval is a q <br /> function of sampling protocols, volume . <br /> requirements, and the yield s <br /> icharacteristics and storage capacity of Aqu�er <br /> the formation Upon completion of ; <br />' sample collection, the push rods and <br /> sampler, with the exception of the PVC <br /> f <br /> screen and steel drop off tip are <br />' retrieved to the ground surface, Y <br /> decontaminated and prepared for the <br /> next sampling event Figure GWS <br /> collected, including the <br /> A summary of the groundwater samples c g sampling P 9 date, <br />' depth and location identification, is presented in Table 1 and the corresponding <br /> CPT plot <br /> For a detailed reference on direct push groundwater sampling, refer to Zemo et <br /> al , 1992 <br />