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�r vl k'9 KLEINFELDER APPENDIX B TYPICAL KLEINFELDER GEOPROBE FIELD PROTOCOL B-1 FIELD PREPARATION Before performing work in the field, environmental staff reviews the scope of work, prepares a health and safety plan, coordinates the work to be done with their supervisor, assembles the necessary sample equipment containers, and checks, calibrates and cleans equipment to be used in the field. Underground Service Alert (USA) is also contacted prior to field work with the marked boring locations and the scheduled date of drilling, in addition, a utility locating firm is sometimes employed to check the boring locations. B-2 SUBSURFACE SOIL SAMPLING B-2.2 Geoarobe Procedures Geoprobes will be driven and sampled by a subcontractor to Kleinfelder. An attempt to penetrate the surface at each location will be made. At locations where asphalt/concrete are present, coring may be performed at an additional cost agreed upon by the client prior to commencement. Samples will be collected in accordance with the proposal. B-2.3 Qualitative Field Screening An organic vapor detector, such as a Photovac TIP, using a photo-ionization detector (PID) or a Foxboro flame-ionization detector (FID), is used to provide a qualitative screening of each soil sample collected from the borings/probes. The organic vapor detector measures ionizable compounds in the air in parts per million by volume (ppmv). Field calibration is performed using a calibrated span gas such as 100-ppm isobutylene. Ambient air is used to set the instrument to zero. The soil contained in the cone of the sampler or in a brass tube is exposed and screened with the organic vapor detector. The vapor reading is noted as the field screening result. 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 crewmembers. This requirement is included in the complete field health and safety plan developed for the project prior to the start of fieldwork. B-2.4 Collection of Geoprobe Soil and Groundwater Samples The Geoprobe/s will be advanced to the desired total depth, which is typically 5 feet below first encountered groundwater. The Geoprobes will be advanced using a pneumatically driven steel probe. Soil samples will be obtained by inserting a sample barrel, lined with acetate liners, into the probe. The sample barrel will be lowered to the desired sampling depth and driven into the 20-4439-O1.E01/20008311 Page El-1 Copyright 2000, Kleinfelder,Inc. April 25,2000