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u <br />® i <br />KLEINEELDER <br />A-2.3 Collection of Soil Samples <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 <br />sampling depth and then driving (vertical borings) or pushing (slant borings) a 2 -inch diameter <br />Modified California Split -Spoon Sampler, lined with three 6 -inch long brass tubes, into the <br />undisturbed soil. The sampler is then removed from the bottom of the boring. The ends of the <br />bottom (third) 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 II° Groundwater Sampling <br />Hydropunch is a method to collect representative groundwater samples from boreholes without <br />the need to install monitoring \,N%ells. 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 II° system, consisting of a steel drive point attached <br />to a stainless steel barrel with an internal PVC slotted screen, is driven 2 to 3 feet past the bottom <br />of 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 hrou1,1ht 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 <br />11" sampling is decontaminated prior <br />to use at each sampling <br />location by steam cleaning, or by scrubbing <br />in a trisodium phosphate or <br />non -phosphate detergent <br />wash followed by a distilled water <br />rinse. <br />20-3978-03.W36/2019766 <br />Pm,e A-2 <br />© 1999, Kleinfelder. Inc <br />September 9. 1999 <br />