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Appendix A Site Closure Request July 2,2010 Speedy Foods-Stockton Page 3 of 13 On January 18, 2005, Ground Zero personnel supervised the installation of vapor extraction well VW2 by V&W. On February 28, 2005, a Ground Zero technician supervised the destruction of the groundwater monitoring well MW2 in response to a letter dated February 15, 2005 sent by EHD requesting destruction of the well to facilitate the Highway 99 Interchange Project being directed by CalTrans. A Solleco®thennal oxidizer soil vapor treatment system(VTS) was placed in operation on August 8, 2005 connected by sub-grade piping to two vapor extraction wells (VW1 and VW2), a dual- phase extraction well (EW1), and two monitoring wells (MW3 and MW4). Details are discussed in Ground Zero's Quarterly Monitoring Report January through March 2005 dated May 2, 2005 and Quarterly Monitoring Report July through September 2005 dated November 22, 2005. Ground Zero submitted the Feasibility Study - Enhancement of Existing Remediation Activities dated September 25,2007 which was approved by the EHD in a letter dated October 22, 2007. Ground Zero personnel supervised the installation of three groundwater monitoring wells between October 9 and 25, 2007 by V&W. V&W installed monitoring wells MW 19D (D Zone aquifer), MW18C (C Zone aquifer) and MW17B (B Zone aquifer). Dewey Data Inc. of Stockton, California performed an a-log of MW19D. On November 7, 2007, Del-Tech developed the new monitoring wells. On November 2, 2007, Mr. Vasquez supervised the advancement of two soil confirmation borings (CBI and CB2) by V&W. The confirmation borings were advanced in the location of the former USTs. Details are discussed in Ground Zero's Monitoring Well Installation and Soil Investigation Report-Fall 2007, November 28,2007. On December 4, 2007, Ground Zero personnel supervised the installation of groundwater extraction well EW3 by V&W. The well was surveyed by Morrow Surveying on December 1, 2007. On January 17, 2008, Del-Tech developed well EW3. Details are discussed in Ground Zero's Quarterly Groundwater Monitoring and Treatment System Operational Report October through December 2007 dated February 6, 2008 and Quarterly Groundwater Monitoring, Groundwater Treatment System Operation and Effectiveness, Soil Vapor Extraction System Rebound Test, aid Additional Site Work Report-January through March 2008 dated April 7, 2008. Site closure was requested in Ground Zero's Site Closure Request and Semi-Annual Groundwater Monitoring Report- Winter/Spring 2010, dated March 24, 2010. In a letter dated June 1, 2010, EHD directed the submittal of a work plan to begin destroying the wells no longer necessary for the site investigation. Ground Zero submitted the Groundwater Monitoring Well Destruction Workplan dated June 9, 2010. The June 1, 2010 letter also request additional information be submitted following the requirements of the Tri-Regional Guidelines Appendix A. This document provides the additional information required to continue the review for low-risk closure.