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' k" KLEINFELDER <br /> soil The sampler is then removed from the bottom of the boring The ends of the bottom (third) <br /> tube are covered with Teflon and sealed with tight fitting plastic caps <br /> ' Each sample is individual) labeled The label includes Kleinfelder's name job number, the e <br /> P Y ,J e , date <br /> and time the sample was collected, the employee number of the individual who performed the <br /> sampling, and a unique five-digit sample identification number <br /> A-2.4 Hydropunch Groundwater Sampling <br /> Hydropunch is a method to collect representative groundwater samples from boreholes without <br /> the need to install morutoring wells This method is usually used as an exploration tool for <br /> screening groundwater quality and reducing the number of wells needed at a site <br /> ' A boring is drilled to the desired sampling depth, usually to the top of the groundwater surface, <br /> using hollow stern augers The Hydropunch system, consisting of a steel drive point attached to a <br /> stainless steel barrel with an internal PVC slotted screen, is driven 2 to 3 feet past the bottom of <br /> the boring into the uppermost water bearing zone The barrel is connected to the surface using <br /> clean, 2-inch diameter hollow steel rods The barrel is then pulled back 1 to 2 feet exposing the <br /> internal PVC screen to the soil Groundwater then enters the barrel through the screen under <br /> ' hydrostatic pressure and is brought to the surface with a clean, Teflon or stainless steel bailer <br /> The samples are immediately labeled and placed in an iced sample container <br /> MEquipment 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 /> A-2 5 Collection of BAT Probe Groundwater Samples <br />' One-time groundwater samples are collected using a BAT Probe, which is an in situ <br /> groundwater-sampling device The borings are first advanced to a point immediately above the <br />' desired sampling depth where groundwater is encountered A stainless steel drive tip equipped <br /> with a stainless steel filter is lowered into the boring at the end of a 2 5-inch diameter galvanized <br /> steel pipe and pushed using the drill rig approximately 6 to 12 inches into the soil/aquifer <br />' formation at the bottom of the boring A sterilized, glass, vacuum sealed sampling ampoule <br /> (tube), similar to a standard volatile organics (VOA) vial, is then lowered through the pipe down <br /> to the tip with a cable Between the tip and the sample tube is a double-sided hypodermic needle <br /> (syringe), which simultaneously punctures the seals on the stainless steel drive tip and the septum <br /> of the glass sample ampoule The vacuum in the sample ampoule draws groundwater through <br /> the tip into the glass ampoule The glass ampoule is then pulled out of the pipe, disengaging the <br />' syringe The septum in the glass ampoule and drive tip rescals after the syringe is removed <br /> To reduce the potential for introducing contaminants into the samples, the drive tip, galvanized <br /> pipe, and other equipment used for sample collection are steam cleaned and/or washed with <br /> trisodium phosphate or non-phosphate detergent solution and double rinsed with distilled water <br /> prior to use The sample probe and filters are cleaned in TSP solution and rinsed with methyl <br /> 28209 T03/ST03R1312 Page A-2 <br />' ©2003 Kleinfelder,Inc September 22,2003 <br />