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k KLEINFELDER <br /> The ends of the bottom (third) tube are covered with Teflon and sealed with tight fitting plastic <br /> caps. <br /> If encountered, groundwater will be sampled using the a Hydropunch sampling device. The <br /> Hydropunch system, consisting of a steel drive point attached to a stainless steel barrel with an <br /> internal PVC slotted screen, is driven 2 to 3 feet past the bottom of the boring into the water <br /> bearing zone. The barrel is connected to the surface using clean, 2-inch diameter hollow steel <br /> rods. The barrel is then pulled back 1 to 2 feet exposing the internal PVC screen to the soil. <br /> Groundwater then enters the barrel through the screen under hydrostatic pressure and is brought <br /> to the surface with a clean, Teflon or stainless steel bailer. The samples are immediately labeled <br /> and placed in an iced sample container. <br /> Equipment used for Hydropunch sampling is decontaminated prior to use at each sampling <br /> location by steam cleaning, or by scrubbing in a trisodium phosphate or non-phosphate detergent <br /> wash followed by a distilled water rinse. <br /> After completion, both the shallow and deep borings will be grouted in accordance with San <br /> Joaquin County San Joaquin County Public Health Services/Environmental Health Department <br /> requirements. <br /> 20-2594-03.wP2/2011R002 Page 6of12 <br /> Copyright 2000 Kleinfelder,Inc. December 29,2000 <br />