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�■r -�,- r r r � r r r r i r � r r r �r r <br /> Passive Soil Gas Sampling Work Plan <br /> Burn Pit Area, Deuel Vocation Institution <br /> 235000 Kasson Road, Tracy, San Joaquin County <br /> Comment/Response Table (April 2009) <br /> Comment <br /> Number Comment <br /> Response <br /> 1. According to the Work Plan, utility clearance will be To ensure the sewer lines are not damaged during the placement of the devices, the <br /> provided by Underground Service Alert. Please confirm borings will be drilled using a handauger. If any hard surface,that could be a sewer <br /> the Department of Corrections will be providing line is encountered,the drilling will be stopped and the boring relocated. DVI staff <br /> verification of the location and depth of the sewer and will be onsite during drilling activities to aid in sewer line location. Should it be <br /> storm water lines depicted on the site maps prior to the necessary, DVI staff will be available to repair any sewer line damage. <br /> start of field work. <br /> 2. Please provide a summary of how the shallow borings The shallow borings will be abandoned by pouring bentonite crumbles into the open <br /> will be abandoned after the Gore modules are removed. boring to ground surface and hydrated with potable water. <br /> 3. The Work Plan indicates the final locations will be A total of fifty passive soil gas devices will be placed during this investigation. The <br /> determined in the field by the URS geologist. Please study area will include the former burn pit and continue north along the sewer lines to <br /> specify the criteria or rationale the field geologist will be the old sewage treatment plant. URS will place the devices using a grid pattern to <br /> using to assess the final boring locations. cover the most area as possible,attempting to match the locations shown on the figure <br /> presented in the work plan. <br /> 4. Please provide a schedule for submitting the Report of URS anticipates the following schedule. <br /> Findings. 13 April 2009—Conference call with the RWQCB. The work plan was verbally <br /> approved and URS was authorized to commence activities. <br /> 24 April 2009—URS to complete marking the proposed sampling locations. <br /> 8 May 2009—URS to complete the drilling of the borings and placement of the <br /> devices. <br /> 22 May 2009—URS to complete removal of the devices and boring abandonment. The <br /> devices will be shipped to the laboratory. <br /> 30 July 2009—URS to submit the report of findings the RWQCB. <br /> 5. The Report of Findings needs to include a scaled map In the report, URS will include a scaled map showing final boring locations and As- <br /> showing final boring locations and As-Built sewer and Built drawings for the sewer and storm water lines. <br /> storm water line locations. <br /> G:\STATE-COUNTY-CITY\STATE\Cal-DGS\Calif-DGS-RESD\UST PROTECT FILES\DVI\B=Pit\2009 Passive Soil Gas\RTCs DVI Passive Soil Gas.doc I <br />