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K L E I N F E L D E R 2.0 SCOPE OF WORK 2 1 Permitting and Pre-Field Activities The San Joaquin County Public Health Services Department Environmental Health Division (PHS/EHD) requires approval of a workplan, application for a boring permit, and payment of a boring permit application fee prior to conducting assessment activities It is assumed that this workplan will suffice to obtain approval from the PHS/EHD Kleinfelder will prepare drilling permit applications for submittal to PHS/EHD along with the required fees The permits and workplan must be approved prior to drilling activities and sampling PHS/EHD usually requires up to approximately two weeks to Issue the permits Kleinfelder will also contact Underground Service Alert 48 hours prior to conducting field work to notify local utilities of our proposed subsurface assessment Kleinfelder will additionally prepare a health and safety plan prior to the actual field assessment 22 Soil Sampling Subsurface soil samples will be collected from 1 soil boring and one monitoring well boring drilled in the vicinity of the tank farm area Tentative boring locations are shown on Plate I The actual sampling locations will be dependent on access, surface conditions, and potential interference with subsurface utilities Based on the depth to water information supplied by the Regional Water Quality Control Board, each soil boring will be drilled to a depth of approximately 50 feet below grade, or first encountered groundwater (presumed to be around 45 to 50 feet below ground surface) Soil borings will be advanced using a truck-mounted drill rig, equipped with 8-inch diameter hollow stern augers During drilling, an experienced environmental geologist will classify the soil, log the lithology and collect soil samples for laboratory analysis i During drilling, a flame ionization detector (FID), will be used to provide a qualitative screening of each soil sample collected from the borings For the protection of the drilling crew, the FID will also be used to measure the volatile concentrations in the breathing zone prior to and during the drilling of the samples Soil samples will be collected approximately every 5 feet for field screening, hthologic logging, and potential chemical analysis Samples will be 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 The sampler is then removed from the bottom of the boring The ends of the bottom (third) tube are covered with Teflon and scaled with tight-fitting plastic caps 40-Y P917914010 P0l 9 3 Copyright 2000 Kleinfelder Inc