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' k'9 KLEiNFELDER <br /> a 2-inch diameter Modified California Split-Spoon Sampler, lined with three 6-inch long <br /> brass tubes, into the undisturbed soil The sampler is then removed from the bottom of <br /> the boring The ends of the bottom (third) tube are covered with Teflon and sealed with <br /> tight fitting plastic caps <br /> Each sample is individually labeled The label includes Kleinfelder's name, job number, <br /> the date and time the sample was collected, the employee number of the individual who <br /> performed the 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 <br /> without the need to install monitoring wells This method is usually used as an <br /> exploration tool for screening groundwater quality and reducing the number of wells <br /> needed at a site <br /> A boring is drilled to the desired sampling depth, usually to the top of the groundwater <br /> surface, using hollow stem augers The Hydropunch system, consisting of a steel drive <br /> point attached to a stainless steel barrel with an internal PVC slotted screen, is driven 2 <br /> to 3 feet past the bottom of the boring into the uppermost water bearing zone The <br /> barrel is connected to the surface using clean, 2-inch diameter hollow steel rods The <br /> 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 <br /> is brought to the surface with a clean, Teflon or stainless steel bailer The samples are <br /> immediately labeled and placed in an iced sample container <br /> Equipment used for Hydropunch sampling is decontaminated prior to use at each <br /> sampling location by steam cleaning, or by scrubbing in a trisodium phosphate or non- <br /> phosphate detergent 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 <br /> above the desired sampling depth where groundwater is encountered A stainless steel <br /> drive tip equipped with a stainless steel filter is lowered into the boring at the end of a <br /> 2 5-inch diameter galvanized steel pipe and pushed using the drill rig approximately 6 to <br /> 12 inches into the soil/aquifer formation at the bottom of the boring A sterilized, glass, <br /> vacuum sealed sampling ampoule (tube), similar to a standard volatile organics (VOA) <br /> vial, is then lowered through the pipe down to the tip with a cable Between the tip and <br /> the sample tube is a double-sided hypodermic needle (syringe), which simultaneously <br /> punctures the seals on the stainless steel drive tip and the septum of the glass sample <br /> ampoule The vacuum in the sample ampoule draws groundwater through the tip into <br /> 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 reseals after the syringe is <br /> removed <br /> 28209 T09/ST05R14541DH 1v Page A-2 <br /> November 30, 2005 <br /> 0 2005, Klemfelder, inc <br />