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April 23, 2010 Mr. Mike J. Infurna Jr., REHS Senior Registered Environmental Health Specialist San Joaquin County Department of Environmental Health 600 East Main Street (� Stockton, California 95202 Re: Well Destruction Workplan Del Monte Foods - Former Disco Site 110 North Filbert Street, Stockton, CA 95205 Dear Mr. Infurna: On behalf of Del Monte Foods, The Source Group, Inc. (SGI) presents this well destruction workplan to the San Joaquin County Environmental Health Department (SJCEHD) for the Del Monte Foods - Former Disco Site, located at 110 North Filbert Street, Stockton, California (Figure 1, Site). This workplan has been prepared in response to SJCEHDs correspondence entitled Case Closure Summary, dated March 15, 2010, and the Regional Water Quality Control Board (RWQCB) letter dated April 8, 2010 (Appendix A). The workplan details the proposed scope of work and methodology to destroy all wells associated with historical remediation and monitoring activities at the Site. BACKGROUND The Site was operated as a service station until the property was purchased by Del Monte Foods in 1976. Three 10,000-gallon underground storage tanks (USTs) were identified on the Site and removed in 1985. During UST removal activities, soil was excavated, aerated on-Site, and placed back into the excavation. Historical investigation activities have identified the presence of total petroleum hydrocarbons as gasoline (TPH-g), benzene, toluene, ethylbenzene, total xylenes (BTEX), and 1,2-dichloroethane (1,2-DCA) in soil and groundwater. On-Site remediation efforts have included the operation of a soil vapor extraction (SVE) and air sparge (AS) system from February 1995 through November 1995. In November 1995 the SVE and AS systems were shut down due to rising water levels. Subsequently a new SVE and AS system began operation in May of 2003. An ozone injection system designed to treat the southern edge of the volatile organic compound (VOC) plume began operation in September of 2003. The SVE and ozone injection system were shut down permanently December 2008, as approved by the SJCEHD. A total of 40 borings with 59 well casings, consisting of monitoring wells, soil vapor extraction points, air-sparge points, and ozone injection points, are located on- and off-Site (Figure 2). All points were installed between 1991 and 2009 to actively monitor and remediate the Site. Copies of the documented well completion logs for each well are included in Appendix B. A summary of well construction details is provided on Table 1.