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k`■ KLEINFELDER <br /> Groundwater sampling performed to date has not indicated the presence of aromic volatile organic <br /> compounds benzene, toluene, ethylbenzene, xylene, (BTEX) or polynuclear aromatic hydrocarbons <br /> (PNAs) in the monitoring wells on site. <br /> Total Petroleum Hydrocarbons (TPH) concentrations were detected in soil samples collected within <br /> the concrete-bottom oil reservoir. TPH concentrations were also detected in samples from two <br /> locations outside the northwest comer of the reservoir where a pipeline reportedly existed between <br /> the reservoir and another off site reservoir. <br /> Department of Toxic Substance Control (DTSC) has reviewed the site assessment data and the <br /> health risk assessment and concluded that the site may be developed as long as the soil <br /> contamination between 6 to 10-feet below ground surface(bgs) is not disturbed and left onsite. <br /> SCOPE OF WORK <br /> Kleinfelder has prepared the following scope of work to further assess the site. The services <br /> proposed for the additional assessment consist of four tasks: <br /> 1) Drilling Permit and Pre-Mobilization Preparation <br /> 2) Geoprobe Soil Assessment <br /> 3) Analysis of Data and Report Preparation <br /> Task 1 - Drilling Permit and Pre-Mobilization Preparation <br /> San Joaquin County Public Health Services Department, Environmental Health Division <br /> (PHS/EHD) requires approval of a boring permit application prior to advancing Geoprobes. <br /> Kleinfelder will prepare permit applications for submittal to PHS/EHD along with the required <br /> fees. These permits must be approved prior to advancing the Geoprobes. The PHS/EHD usually <br /> requires approximately two weeks to issue the permits. <br /> Prior to initiating our Feld activities, a detailed health and safety plan would be written for use <br /> during our field activities. Additionally, scheduling of subcontractors (Geoprobe contractor, <br /> analytical laboratory, etc.) would occur. <br /> Task 2 - Geoprobe Soil Assessment <br /> Kleinfelder proposes collecting soil samples from a total of 108 Geoprobes, one in each lot along <br /> the southeastern portion of each lot. The actual sampling locations will be dependent on access, <br /> surface conditions, and potential interference with subsurface utilities. Because of the nature of <br /> the Geoprobe technique, the possibility exists that probe refusal may occur. Samples may not be <br /> 20-Y PS-160/201 S P I S2Q01 SC156 Pagc A-2 <br /> © 1998, Kleinfelder, Inc. August 4, 1998 <br />