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KEEINFELDER loot the protection of the drilling career, the organic vapor detectnr also is used to measure the volatile concentrations in the breathing gone prior to and while drilling the borings. Total ionizable hydrocarbon readings in excess of I ppmv may necessitate respiratory protection for the affected caw members. This mquirement 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 w 10 ;fact for field screening and logging. Samples are collected by advancing the boriRS 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 Lang brass tubes, unto the undistwrbed sail. 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 Kleinfeldees name,jolt number, the date and time the sample was collected, the employee number of the individual who performed the sampfing4 and a unique five4et sample iden#iLfication number. B-2.5 Hydropunch H'Groundwater Sampling H dmpuuch IITM 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 de-sired sampling depth, usually to the top of the groundwater smrface, using hollow stem augers. The Hydropunch 11'x" 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 step rods. The barrel is then pulled bank 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 planed in an iced sample container. Equipment used for Hydropunch 117m sa.nVIing is decontaminated prior to use at each sampling lorafi4n by steam cleaning,or by scrubbing in a trisodium phosphate or non-phosphate detergent wash followed by a distilled water rinse. 20.YP1-5681201 iP 1311201 IC235 Page B-2 Copyd&2001,KkiAdder,Inc, May 14.2001