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PROPOSED PLAN FOR CONTAMINATED GROUNDWATER REMEDIATION OF OPERABLE UNIT NO. 1 AT DEFENSE DISTRIBUTION REGION WEST-TRACY TRACY, CALIFORNIA DECEMBER 1992 Investigations"), for studying and evaluating INTRODUCTION cleanup alternatives(these studies are called"Fea- sibility Studies"), and for documenting the final The Defense Distribution Region West-Tracy decision(the"Record of Decision"). See Figure 1 (DDRW-Tracy), in cooperation with the Central (page 11) for a description of the Superfund Valley Regional Water Quality Control Board process. (RWQCB) and the Department of Toxic Sub- stances Control(DTSC)of the California Environ- This Proposed Plan concerns the cleanup of mental Protection Agency, and the U.S. Environ- groundwater contaminated primarily with the sol- mental Protection Agency (EPA), are requesting vents trichloroethene(TCE)and tetrachloroethene public comment on measures to address environ- (PCE),which have migrated off base to the north- mental contamination inOperable Unit No. 1 at the east. The on-base and off-base groundwater zone DDRW-Tracy Superfund site in Tracy,California. of contamination, or plume, emanating from the northern part of the depot has been designated as DDRW-Tracy Operable Unit No. 1 (OU#1),to be considered for cleanup in advance of completion of a comprehensive site-wide remedial investigation/ DDRW —,�:y4 1/ r feasibility study (RDFS) and Record of Decision Ca. /l k (ROD). OU#1 is the subject of this Proposed Plan. Gr e An OU #1 RDFS has been completed, and the operable unit has been adequately defined so that $TOCKTON cleanup can be planned and implemented. Other chemicals of concern,which have historically been M&ANTECA S found on base,include pesticides,heavy metals and zo 941 other organics.They will be addressed in the future in the Site Wide RIIFS. This Proposed Plan is a public document required by the EPA Superfund law,the Compre- table Of contents hensive Environmental Response, Compensation Introduction .................................. 1 and Liability Act (CERCLA), Section 117(a). Site Background ........................... 2 CERCLA is a federal law passed in 1980 and Extent of Contamination ............... 3 modified by the Superfund Amendments and Risk Summary .............................. 4 Reauthorization Act of 1986 (SARA). The act Interim Remedial Measure ............ 5 created a trust fund,known as Superfund,to inves- Summary of Alternatives .............. 5 tigate and clean up hazardous waste sites. The acts Evaluation of Alternatives ............ 7 specify procedures for investigating Superfund Preferred Alternative .................... 7 sites (these investigations are called "Remedial Glossary ....................................... 9 1