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K LEIN F E LD E R <br /> A-2.3 Collection of Soil Sample <br />' Soil samples are collected approximately every 5 to 10 feet for field screening and logging <br /> Samples are collected by advancing the boring to a point immediately above the desired sampling <br />' depth and then driving (vertical borings) or pushing (slant bonngs) a 2-inch diameter Modified <br /> California Split-Spoon Sampler, lined with three 6-inch long brass tubes, into the undisturbed <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 individually labeled The label includes Kleinfelder's name,job number, the 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 monitoring 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 stem 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 />' Equipment used for Hydropunch sampling is decontaminated prior to use at each sampling <br /> location by steam cleaning, or by scrubbing in a tnsodium 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-timesam roundwater les are collected using a BAT Probe, which is an msitu groundwater- <br /> sampling device The borings are first advanced to a point immediately above the desired <br />' sampling depth where groundwater is encountered A stainless steel drive tip equipped with a <br /> stainless steel filter is lowered into the boring at the end of a 2 5-inch diameter galvanized steel <br /> pipe and pushed using the drill ng approximately 6 to 12 inches into the soil/aquifer formation at <br />' the bottom of the boring A sterilized, glass, vacuum sealed sampling ampoule (tube), similar to <br /> a standard volatile organics (VOA) vial, is then lowered through the pipe down to the tip with a <br /> cable Between the tip and the sample tube is a double-sided hypodermic needle (syringe), which <br /> simultaneously punctures the seals on the stainless steel drive tip and the septum of the glass <br /> sample ampoule The vacuum in the sample ampoule draws groundwater through the tip into the <br /> ' 20-1417-16 E03l201 18259 Page A-2 <br /> Copyright 2001, Kleinfelder Inc February 28 2001 <br />