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' k' ■ KLEINFELDER B-2 3 Collection of Soil Samples Soil samples aie collected approximately every 5 to 10 feet for field screening and logging Samples are collected by advancing the boring to a point Immediately above the desired sampling depth and then driving (vertical borings) or pushing (slant borings) a 2-inch diameter Modified California Split-Spoon Samplei lined with three G-Inch long brass tubes, into the undisturbed soil The sampler is then removed from the bottom of the boring The ends of the Ibottom (third) tube are covered with Fellon and sealed with tight fitting plastic caps Each sample is Individually labeled The label includes Kleinfelder's name,fob number, the date and time the sample was collected the employee number of the individual who performed the sampling, and a unique five-digit sample identification number B-2.4 Hydropunch Groundwater Sampling Hydropunch is a method to collect representative groundwater samples from boreholes without the need to install monitoirng wells This method is usually used as an exploration tool for screening groundwater quality and teducing the number of wells needed at a site A boring is drilled to the desired sampling depth, usually to the top of the groundwater surface, using hollow stem augers The Hydropunch system, consisting of a steel drive point attached to a stainless steel bar tel with an internal PVC slotted screen, is driven 2 to 3 feet past the bottom of the boring into the iippeirmost water bearing zone The barrel IS connected to the surface using clean, 2-inch diametet hollow steel tods The barrel is then pulled back 1 to 2 feet exposing the ' internal PVC screen to tine soli CHOUndwater then enters the barrel through the screen under hydrostatic pressure and is brought to the surface with a clean Teflon or stainless steel bailer The samples are Immediately labeled and placed in an iced sample container Equipment used for H dro unch sale ling is decontaminated prior to use at each sampling Y p P � location by steam cleaning, of by scicibbino in a tiisodium phosphate or non-phosphate detergent wash followed by a distilled water r case ' B-25 Collection of RAT Probe Gi oundivater Sam ies One-time groundwater samples are collected using a BAT Probe which is an insitu groundwater sampling device The botings ate litst advanced to a point immediately above the desired sampling depth where groundwater is encountered A stainless steel drive tip equipped with a stainless steel filter is lowered into the boring at the end of a 2 -inch diameter galvanized steel pipe and pushed using the drill rig appioxiimately 6 to 12 inches into the soil/aquifer formation at the bottom of the boring A sterilized, Mass vacuum sealed sampling ampoule (tube), similar to a standard volatile organics (VOA) vial, is then lowered through the pipe down to the tip with a cable Between the tip and the sample tube is a double-sided hypodermic needle (syringe), which simultaneously punctures the seals on the stainless steel drive tip and the septum of the glass sample ampoule The vacuum in the sample ampoule draws groundwater through the tip 20-1108-24 EO 1/2019R 120 Page B-2 01999, Klemfeldcr, lnL February 5, 1999