SITE INFORMATION AND CORRESPONDENCE

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AOL File No. 24-220176-FO I k`■ KLE IN F E L D E R May 11, 1994 KLEINFELDER FIELD PROTOCOL A-1.1 FIELD PREPARATION Before performing work in the field, environmental staff will review the scope of work, prepare a health and safety plan, coordinate the work to be done with their supervisor, assemble the necessary sample containers, and check, calibrate and clean equipment to be used in the field. Underground Service Alert (USA) is informed of the boring locations and the scheduled date of drilling, or a utility- locating firm is employed to check the boring locations. A-2 SUBSURFACE SOIL SAMPLING A-2.1 Geoprobe Advancement Geoprobes are advanced by driving a thin-walled tube into the soil. Subsurface soil samples are collected from an inner liner. An experienced environmental geologist or engineer classifies the soil, logs the stratigraphy of the borings, and collects soil samples. A-2.2 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 sod sample collected from the borings. 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. 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 field crew, the organic vapor detector also is used to measure the volatile concentrations in the breathing zone prior to and during the drilling of the borings. Total ionizable hydrocarbon readings in excess of 1 ppmv may necessitate respiratory protection for the affected crew members. This requirement is included in the complete field health and safety plan developed for the project prior to the start of field work. A-2.3 Collection of Soil Samples Soil samples are collected approximately every 5 feet for field screening and logging. Samples are collected by advancing the boring to a point immediately above the desired sampling depth and then driving (vertical borings) or pushing (slant borings) a Modified California Sampler, lined with three brass tubes, into the undisturbed soil. In the case of Geoprobes an inner soil sample finer is used. 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 Meinfelder's name, job number, the date and time the sample was collected, the employee number of the individual who performed the sampling, and a unique five-digit sample identification number. A custody seal may be placed on the sample in such a way that any attempt to tamper with the sample is easily visible. i 24-220176-F01/CR43-8 (1994) A-1 June 3, 1994 Copyright 1994 Kleinfelder, Inc. i