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10/06/1992 11114 FROM QUORUM CONSULTANTS TO 15105374304 P. 01 C-2 PROCEDURESFIELD ' Field work performed by Quorum is conducted in accordance with a Site Safety Plan which describes the basic safety requirements for the subsurface environmental investigation and the drilling of soil boraigs at the work site, The Site Safety Plan is applicable to personnel of Quorum and to subc,.atractors of Quorum. Personnel scheduled to work at the site are briefed on the contents of the Site Safety Plan before work begins A copy of the Site Safety Plan is kept at the work site and is available for reference by appropriate parties The staff geologist of Quorum is the Site Safety Officer. riqd Instruments Quorum Environmental Consultants Inc. uses ahotoionizau p on detector (PID)in the field to screen samples for laboratory analysis and to make general evaluations of the extent of hydrocarbon-bearing soil at the site These instruments measure the total concentration of ionizable compounds (: •luding hydrocarbons) in vapor emitted from soil or water samples under ambient field conditions. Variations in soil type, soil temperature, moisture content, ambient air temperature, and vapor pressures of respective constituents affect the results. Laboratory analysts involves extraction of hydrocarbons from the sample under controlled laboratory conditions As a result, readings obtained with a PID may not correspond to the results obtained by laboratory analyses The geologist must evaluate the relative merit of the measurements made with a PID and the laboratory analyses in light of the field conditions existing at the site and the differences between field and laboratory methods Drilling Before drilling begins. Underground Service Alert is notified of our intent to drill, so that approximate locations of underground utility Imes and structures can be marked The soil borings are hand-augered to a depth of 5 feet before drilling began to minimize the possibility of damaging underground utilities. The borings are drilled with a Mobile B-61 or similar drill rig, equipped with 8- or 10-inch- diameter, continuous flight, hollow-stein augers The augers are steam-cleaned prior to use in each boring to minimize the possibility of cross-contamination. Sampling equipment is ' cleaned between uses by washing with Alconox (an industrial soap) and rinsing with clean tap water Soil samples will be collected using a Califorrita_modrfied,split-spoon sampler equipped with cleaned brass sleeves. During drilling samples will be collected by advancing the auger to a point immediately above the sampling depth and driving the sampler through the auger into the native soil The sampler will be driven 18 inches or to refusal with a standard 140. pound hammer repeatedly dropped 30 inches. The number of blows required to drive the sampler each successive 6-inch interval will be counted and recorded to give an