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,ICOM 0 AECOM 9622.6600 tel 2101 Webster Street, Suite 1900 510.350.9988 fax Oakland,California 94612 June 15, 2011 Project 60217485 Attn: Site Mitigation Unit San Joaquin County Environmental Health Department 600 East Main Street Stockton, CA 95202 Subject: Work Plan for Destruction of Three(3) Monitoring Wells Former Tyco Electronics Fremont Street Facility 1950 West Fremont St., Stockton, California In accordance with San Joaquin County Environmental Health Department(EHD) Well and Boring Permit Application Requirements, AECOM Technical Services, Inc. (AECOM) has prepared this Work Plan for destruction of the three (3) groundwater monitoring wells at the former Tyco Electronics Corporation (TEC) facility at 1950 West Fremont Street in Stockton, California (the site). The wells (MW-1, MW-2, and MW-3), shown on Figure 1, were installed in June 2008 as part of the Preliminary Endangerment Assessment(PEA) process initiated under the oversight of the California Department of Toxic Substances Control (DTSC). In a letter dated September 28, 2009, DTSC concurred that no further groundwater monitoring was needed and provided approval for abandoning the wells in accordance with California Well Standards(see attached). On May 12, 2011, DTSC approved a Land Use Covenant restricting site use due to soil containing lead at the site; however, those restricted areas are below the building and under a pad, areas where none of the three wells are located. BACKGROUND The site consists of a two story concrete tilt-up building with a concrete floor, and associated paved parking and support areas. Previously, the site operated as a printed circuit board manufacturing facility under TEC and its predecessor companies. TEC ceased operations at the site in May 2001. The site was purchased in December 2005 by The Pierce Building LLC., the current property owner. Currently, the site is occupied by a brewery. After TEC ceased site operations and post-closure sampling was conducted, DTSC entered into a Consent Agreement for Corrective Action with TEC in July 2004. Under the Consent Agreement, initial soil and groundwater sampling was conducted in January 2005 and August 2006 in accordance with DTSC Preliminary Endangerment Assessment(PEA) guidance. Based on the results of the PEA activities, DTSC requested that groundwater monitoring wells be installed at the site and a minimum of four consecutive quarters of groundwater monitoring be conducted to further assess groundwater quality at the site. Groundwater monitoring was conducted quarterly between June 2008 and July 2009. Based on the groundwater monitoring program, groundwater issues were not found and it was recommended that no further groundwater monitoring would be needed. In September 2009, DTSC concurred and provided approval for abandoning the wells in accordance with California Well Standards. DTSC approved the recommendation of a Land Use Covenant restricting site use due to soil containing lead. In April 2011, a Corrective Measures Proposal recommending the Land Use Covenant went through public notice and was approved in May 2011. It should be noted that the wells are not located within the site restricted areas, which are below the building and below a concrete pad.