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�`■ KLEINFELDER For the protection of the drilling crew, the organic vapor detector also is used to measure the volatile concentrations in the breathing zone prior to and while drilling the borings. Total ionizable hydrocarbon readings in excess of 1 ppmv may necessitate respiratory protection for the affected crew members. This requirement is included in the complete field health and safety plan developed for the project prior to the start of field work. B-2.4 Collection of Soil Samples Soil samples are 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 Sampler, lined with three 6-inch long brass tubes, into the undisturbed soil. The sampler is then removed from the bottom of the boring. The ends of the bottom (third) tube are covered with Teflon and sealed with tight fitting plastic caps. Each sample is individually labeled. The label includes Kleinfelder's name,job 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-2.5 Hydropunch IITM' Groundwater Sampling Hydropunch III is a method to collect representative groundwater samples from boreholes without the need to install monitoring wells. This method is usually used as an exploration tool for screening groundwater quality and reducing 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 IIT1`' system, consisting of a steel drive point attached to a stainless steel barrel with an internal PVC slotted screen, is driven 2 to 3 feet past the bottom of the boring into the uppermost water bearing zone. The barrel is connected to the surface using clean, 2-inch diameter hollow steel rods. The bagel is then pulled back 1 to 2 feet exposing the internal PVC screen to the soil. Groundwater 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 Hydropunch 11711 sampling is decontaminated prior to use at each sampling location by steam cleaning, or by scrubbing in a trisodium phosphate or non-phosphate detergent wash followed by a distilled water rinse. 20-YP8-160,2018P182/2018C356 Page n-2 © 1998, Kleinfelder, Inc. August 4, 1998