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68/16/95 WED 14:42 FAX 916 37013 KLEINFELDER -.++ STOCKTON 4006 • KLEINFELDER ATTACIUUENT B KLEINFELDER FIELD PROTOCOL B-1 FIELD PREPARATION Before performing work in the field, envirormental 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 DRILLING AND SUBSURFACE SGIL SAMPLING B-2.1 Drilling Soil borings are advanced using a truck-mounted drill rig, equipped with hollow stem augers. Subsurface soil samples are collected from the soil borings. While drilling, an experienced environmental geologist classifies the soil, lugs the stratigraphy of the borings, and collects soil samples. B-2.2 Qualitative Field Screening An organic vapor detector, such as a Photowic TIP, using a photo-ionization detector (PID) or a Foxboro flame-ionization detector (FED), is used to provide a qualitative screening of each soil 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 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 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. B-2.3 Collection of Soil Samples Soil samples are collected approximately ever},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 2-inch inner diameter Modified California Split-Spoon Sampler, lined with three 6-inch long brass tubes, into the undisturbed soil. 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 Kleinfelder's name,job number, the date and time the sample was collected, the employee number of the individual who performed the 23-YP4696nT950035(1995) C4 July 20, 1995 Copyright 1995 Kleinfelder,Inc.