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Central Valley Region <br /> Karl E.Longley,SCD,P.E.,Chair Z> <br /> Linda S.Adams <br /> 11020 Sun Center Drive 4200,Rancho Cordova.California 956746114 Arnold <br /> � ecrJor Schwarzenegg <br /> n+ironmnmen,al Phone(9]6)464-3291 •FAX(91 6)464-4645 er <br /> Praecon hnP:I/Anvw.waterboards.ca.gov/centralvalley ov/centralvalleY Governor <br /> l 26 March. 2009 <br /> Mr. Jeremiah Peacock <br /> State of California-Department of Corrections and Rehabilitation <br /> 9838B Old Placerville Road <br /> ' P.O. Box 942883 <br /> Sacramento, CA 95826 <br /> ' PASSIVE SOIL GAS WORK PLAN, BURN PIT AREA, DEUEL VOCATIONAL <br /> INSTITUTION, 23500 KASSON ROAD, TRACY, SAN JOAQUIN COUNTY <br /> The California Regional Water Quality Control, Board, Central Valley Region (Regional <br /> Water Board) staff reviewed the 23 February 2009 Work Plan for Passive Soil Gas Sampling <br /> (Work Plan) submitted on your behalf by the URS Corporation (URS). The purpose of the <br /> ' passive soil gas sampling is to evaluate the potential for the sewer and storm water lines to <br /> be a transport mechanism for the tetrachlroethene (PCE), trichloroethene (TCE), and cis-1 ,2 <br /> dichlroethene (DCE) present in groundwater at the burn pit and sewage treatment plant <br /> areas of the Deuel Vocational facility. <br /> URS is proposing to install a total of 50 Gore© modules at a depth of three feet below <br /> ground surface. The pattern of the installation, as shown on Figure 1 of the Work Plan, is <br /> proposed to be composed of sets of three modules installed on top of and offset 25 feet <br /> either side of the existing storm water/sewer lines. Each set of modules are proposed to be <br /> located at 50-foot intervals along the storm water/sewer lines from the burn pit area and <br /> terminating in the empty field to the north, where treated groundwater has been sprayed in <br /> 1 the past. Approximately 15 of the 50 Gore© modules are proposed to be placed in the empty <br /> field in three rows of five modules, spaced approximately 50 feet apart. The Gore modules <br /> are proposed to remain on site for 7 to 10 days, then removed and analyzed for volatile <br /> ' organic compounds by EPA Method 8260/8270. <br /> Regional Water Board staff concurs with the Work Plan, provided the following comments <br /> ' are addressed in a Response to Comments letter: <br /> 1.) According to the Work Plan, utility clearance will be provided by Underground Service <br /> ' Alert. Please confirm the Department of Corrections will be providing verification of <br /> the location and depth of the sewer and storm water lines depicted on the site maps <br /> prior to the start of field work. <br /> 2.) Please provide a summary of how the shallow borings will be abandoned after the <br /> Gore© modules are removed. <br /> California Environmental Protection Agency <br /> ' 014ecycled Paper <br />