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Appendix A Site Closure Request July 2,2010 Speedy Foods-Stockton Page 2 of 13 Between October 16 and October 18, 2000, Ground Zero.personnel supervised Spectrum during the installation of four groundwater monitoring wells (MW5 through MW8) in the shallow water bearing zone (A Zone aquifer). Between October 17 and October 23, 2000 Spectrum installed groundwater monitoring well (MW9B) in the intermediate 120-foot water bearing zone (B Zone aquifer). Wellhead elevations of all site monitoring wells were surveyed, and the newly installed monitoring wells were developed between October 23 and 25, 2000. Details are discussed in Ground Zero's Additional Subsurface Investigation Summary Report dated February 28,2001. In earl Febrv• 2002, a new water su Iy y�elLwas placed into service after passing required water quality tests and receiving approval from the San Joaquin County Environmental Health Department (EHD). The old well was subsequently destroyed by Clark Well Inc. under the supervision of Ms. Ellsaesseran"�W'iails are discusse in`M'ound Zero's First Quarter Groundwater Monitoring and Sampling Report dated May 3,2002. Between October 6 and October 8, 2003, Ground Zero personnel supervised V&W Drilling, hire. (V&W) during the installation of three groundwater monitoring wells (MW 10, MW 11, and MW12) in the A Zone aquifer and one vapor extraction well (VW1). Between October 8 and October 16, 2003 V&W installed monitoring wells MW13C (C Zone aquifer) and MW14B (B Zone aquifer). The groundwater monitoring wells were developed between October 17 and October 23, 2003. On October 28, 2003 Morrow Surveying surveyed the newly installed monitoring wells. Details are discussed in Ground Zero's Monitoring Well Installation Report dated May 20, 2004. On October 22, 2003 Del-Tech Geotechnical Support Services(Del-Tech) performed short-tern vapor extraction tests on wells MWl and VWI using an internal combustion engine equipped with a catalytic converter; instrumentation for measuring air flow, air pressure/temperature, and volatile organic compound concentrations; and PVC piping and fittings for wellhead connections. Details are discussed in Ground Zero's Monitoring Well Installation Report dated May 20, 2004. On October 29, 2003, groundwater samples were collected from well MW1 to satisfy California Regional Water Quality Control Board, Central Valley Region (RWQCB) Wastewater Discharge Requirements (WDRs) General Order No. R5-2003-004412 which was issued by the RWQCB in a letter dated Nov mer , 2003. The groundwater treatment system (GWTS) was put into operation on November 5, 2003. Details are discussed in Ground Zero's Fourth Quarter 2003 Groundwater Monitoring and Sampling Report dated May 28, 2004. On June 30, 2004 and July 1, 2004 Ground Zero personnel supervised V&W during the installation of monitoring wells MW 15 and MW 16. The newly installed wells were developed on July 6, 2004. Details are discussed in Ground Zero's Quarterly Groundwater- Monnitoring Report, April through June 2004 Including Groundwater Treatment System Status and Installation of Monitoring Wells MWI S and MWI dated August 18,2004. On July 20, 2004, Ground Zero personnel supervised the installation of monitoring/extraction well EW2. The newly installed well was developed on August 3, 2004 and brought on-line on November 24, 2004. Details are discussed in Ground Zero's Quarterly Groundwater Monitoring Report, July though September 2004 dated November 5, 2004 and Quarterly Groundwater Monitoring Report, October through December 2004 dated February 16,2005.