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1 URS h�_:CEIVED <br /> October 30, 2014 b t✓ 1 31 2014 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> 1 Mr. Durin Linderholm <br /> Engineering Geologist 06a2 <br /> Regional Water Quality Control Board, Central Valley Region <br /> ' 11020 Sun Center Drive, #200 <br /> Rancho Cordova, California 95670 <br /> 1 Reference: Third Quarter 2014 Groundwater Monitoring Report <br /> Deuel Vocational Institution—Burn Pit <br /> 23500 Kasson Road, Tracy, California <br /> ' Dear Mr. Linderholm: <br /> 1 URS Corporation Americas (URS) is pleased to present this report summarizing results of the third <br /> quarter 2014 (3Q14) groundwater monitoring event, and describing monitoring activities and results <br /> 1 associated with the pilot test for the bum pit groundwater plume at Deuel Vocational Institution(DVI), <br /> located at 23500 Kasson Road, Tracy, California (site). This report was prepared on behalf of the State <br /> of California—California Department of Corrections and Rehabilitation (CDCR)under Agreement No. <br /> 5600003303. <br /> 1 Background information and other data have been furnished to URS by CDCR and/or third parties, <br /> which URS has used in preparing this report. URS has relied on this information as fin-nished, and is <br /> 1 neither responsible for nor has confirmed the accuracy of this information. The data interpretation, <br /> conclusions, and recommendations presented in this report were governed by URS' experience and <br /> professional judgment. This report has been prepared based on data current at the time of preparation. <br /> Assumptions based on this data, although believed reasonable and appropriate based on the data <br /> provided herein, may not prove to be true in the future as new data are collected. The conclusions and <br /> recommendations of URS are conditioned upon these assumptions. <br /> 1 BACKGROUND <br /> DVI is a State of California correctional facility with various land uses. Figure I provides a site location <br /> map. Much of the land at DVI is used for inmate housing, and most of the remaining land supports <br /> facility operations. DVI's former bur pit is northeast of the inmate housing facility. The former bum <br /> pit location is variably covered with asphalt, grass, and soil. The land use activity surrounding DVI is <br /> 1 primarily agricultural. A Union Pacific Railroad track runs along the northwest boundary of the DVI <br /> property. <br /> In October 1985, water samples were collected from the agricultural drainage ditch downstream of the <br /> DVI stormwater discharge. Elevated levels of chlorinated solvents were detected in the water samples <br /> collected, particularly tetrachloroethene (PCE) and trichloroethene (TCE). Additional sampling and <br /> analysis of the site was conducted in 1986 to identify the source of the impacts. The test results <br /> concluded that introduction of chlorinated solvents into the stormwater drainage system was occurring <br /> in the northern stormwater drainage subsystem. Further soil and groundwater sampling confirmed the <br /> burn pit as the source area of the chlorinated solvents. <br /> URS Corporation <br /> Crown Corporate Center <br /> 2870 Gateway Oaks Drive,Suite 150 <br /> Sacramento,CA 95833 <br /> Tel:(916)679-2000 <br /> Fax:(916)679-2900 <br />