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m KLEINFELDER <br />APPENDIX A <br />TYPICAL KLEINFELDER FIELD PROTOCOL <br />A-1 FIELD PREPARATION <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 by the drilling subcontractor <br />prior to field work with the marked boring locations and the scheduled date of drilling, in <br />addition, a utility locating firm is sometimes employed to check the boring locations. <br />A-2 DRILLING AND SUBSURFACE SOIL SAMPLING <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 (under the direct supervision of a California State Registered Geologist) <br />classifies the soil, logs the stratigraphy of the borings, and collects soil 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, when appropriate. The organic vapor detector measures <br />ionizable compounds in the air in parts per million by volume (ppmv). Field calibration is <br />performed using a calibrated span gas such as 100-ppm isobutylene. Ambient air is used to set <br />the instrument to zero. The soil contained in the cone of the sampler or in a brass tube is exposed <br />and screened with the organic vapor detector. The vapor reading is noted as the field screening <br />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 />24134.E01 / STO3R304 Page A-I <br />Copyright 2003, Kleinfelder, Inc. February 26, 2003