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KLEINFELDER <br /> Attachment 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, <br /> prepares a health and safety plan, coordinates the work to be done with their <br /> supervisor, assembles the necessary sample equipment containers, and checks, <br /> calibrates and cleans equipment to be used in the field. Underground Service Alert <br /> (USA) is also contacted (when appropriate) prior to field works and is apprised of the <br /> marked boring locations and the scheduled date of drilling. In addition, a utility locating <br /> firm is sometimes employed to check the boring locations. <br /> A-2 Drilling And Subsurface Soil Sampling <br /> A-2.1 Geoprobe Procedures <br /> Geoprobes/soil vapor probes will be driven and sampled by a subcontractor to <br /> Kleinfelder. An attempt to penetrate the subsurface at each location will be made. If <br /> such penetration is not possible, alternative investigative techniques may be used at an <br /> additional cost agreed upon by the client prior to commencement. Samples will be <br /> collected in accordance with the proposal. <br /> A-2.2 Drilling <br /> Soil borings are advanced using a truck-mounted drill rig, equipped with hollow stem <br /> augers. Subsurface soil samples are collected from the soil borings. While drilling, an <br /> experienced environmental geologist classifies the soil, logs the stratigraphy of the <br /> borings, and collects soil samples. <br /> A-2.3 Qualitative Field Screening <br /> An organic vapor detector, such as a Photovac TIP using a photo-ionization detector <br /> (PID) or a Foxboro flame-ionization detector (FID), is used to provide a qualitative <br /> screening of each soil sample collected from the borings. The organic vapor detector <br /> measures ionizable compounds in the air in parts per million by volume (ppmv). Field <br /> calibration is performed using a calibrated span gas such as 100-ppm isobutylene. <br /> Ambient air is used to set the instrument to zero. The soil contained in the cone of the <br /> sampler or in a brass tube is exposed and screened with the organic vapor detector. <br /> 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 <br /> measure the volatile concentrations in the breathing zone prior to and while drilling the <br /> 1 borings. Total ionizable hydrocarbon readings in excess of 1 ppmv may necessitate <br /> 65078.T2/ST06R506/FB:ly Page A-1 <br /> ©2006 Kleinfelder, Inc. May 22, 2006 <br />