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' LFR Inc. ' 1.0 INTRODUCTION ' This report was prepared by LFR Inc. (LFR) on behalf of the California Integrated Waste Management Board (CIWMB) for submittal to the Regional Water Quality Control Board (RWQCB), Department of Toxic Substances Control (DTSC), and San Joaquin County Environmental Health Department (SJCEHD). This report presents the methods and procedures used to destroy groundwater monitoring wells MW-8 and MW-9, located north of the Tracy Tire Fire Site, located in San Joaquin County, ' California ("the Site"; Figures 1 and 2). Well destruction activities were conducted in accordance with the "Work Plan for ' Destroying Groundwater Monitoring Wells MW-8 and MW-9 at the Tracy Tire Fire Site, Tracy, California," prepared by LFR and dated April 10, 2007 (the "Work Plan"). ' Installation and construction details of wells MW-8 and MW-9 are provided in the following reports, which were prepared by LFR: ' • Monitoring Well MW-8 Installation Report, Tracy Tire Fire Site, Former Royster Tire Disposal Facility, Tracy, California, May 31, 2006 ' • Monitoring Well MW-9 Installation Report, Tracy Tire Fire Site, Former Royster Tire Disposal Facility, Tracy, California, August 11, 2006 ' 1.1 Background ' On September 21, 2006, the Tracy Tire Fire Site property was sold at a public tax-lien auction. San Joaquin County sponsored the auction due to back taxes owed to the County. As a result of the property sale, the CIWMB will no longer direct or manage environmental investigation/restoration activities at the Site; therefore, no additional groundwater sampling/evaluation activities are scheduled. ' It has been determined that wells MW-8 and MW-9 are no longer deemed necessary for monitoring the groundwater quality downgradient from the Site. Additionally, the wells are located on an active aggregate mining facility and the property owner (Teichert Aggregate) has requested, via electronic-mail (e-mail), that the wells be destroyed. Mr. Steve Azevedo, of Teichert Aggregate, sent the e-mail request to Mr. Todd Thalhamer, of the CIWMB, on January 2, 2007. ' In response to the request by Teichert Aggregate to have wells MW-8 and MW-9 destroyed, the CIWMB sent an approval letter, dated April 25, 2007, to Mr. Harlin Knoll of the SJCEHD. The letter provided approval to destroy the wells and generally stated that LFR would supervise destruction of the wells in accordance with State and County guidelines after receiving the appropriate well destruction permit from the ' SJCEHD. A copy of the well destruction approval letter prepared by the CIWMB is provided in Appendix A. rpt-well_deswct-mw8&9-09025-v Ldm-LFR Page 1