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KLEINFELDER <br />ATTACHMENT A <br />Before performing work in the field, environmental staff reviews the scope of work, prepares a <br />health and safety plan, coordinates the work to be done with their supervisor, assembles the <br />necessary sample equipment containers, and checks, calibrates and cleans equipment to be used <br />in the field. Underground Service Alert (USA) is also contacted prior to field work with the <br />marked boring locations and the scheduled date of drilling, in addition, a utility locating firm is <br />sometimes employed to check the boring locations. <br />1 11Inlew <br />A-2.1 Drilling <br />Soil borings are advanced using a truck -mounted drill rig, equipped with hollow stem augers. <br />Subsurface soil samples are collected from the soil borings. While drilling, an experienced <br />environmental geologist classifies the soil, logs the stratigraphy of the borings, and collects soil <br />samples. <br />A-2.2 Qualitative Field Screening <br />An organic vapor detector, such as a Photovac TIP, using a photo -ionization detector (PID) or a <br />Foxboro flame -ionization detector (FID), is used to provide a qualitative screening of each soil <br />sample collected from the borings. The organic vapor detector measures ionizable compounds in <br />the air in parts per million by volume (ppmv). Field calibration is performed using a calibrated <br />span gas such as 100 ppm isobutylene. Ambient air is used to set the instrument to zero. The <br />soil contained in the cone of the sampler or in a brass tube is exposed and screened with the <br />organic vapor detector. The vapor reading is noted as the field screening result. <br />For the protection of the drilling crew, the organic vapor detector also is used to measure the <br />volatile concentrations in the breathing zone prior to and while drilling the borings. Total <br />ionizable hydrocarbon readings in excess of 1 ppmv may necessitate respiratory protection for <br />the affected crewmembers. This requirement is included in the complete field health and safety <br />plan developed for the project prior to the start of fieldwork. <br />20-1108-33.001/2011 R1188 Page A-1 <br />0 2001, Kleinfelder, Inc. October 17, 2001 <br />