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Appendix A Site Closure Request July 2,2010 Spcedy Foods-Stoekton Page B of 13 • The VTS removed and destroyed approximately 2,500_lbs of TPHg. • In November 2007 confirmation soil borings were advanced in the locations of the previously most contaminated soil areas. Except for minor levels of contamination found in narrow area within the saturated zone,TPHg and MTBE were not found above laboratory detection limits. 12.0 Isoconcentration Contour Maps TPHg and MTBE isoconcentration maps from the most recent groundwater monitoring event are included as Figures 8 and 9, respectively. 13.0 Summary of Remedial Methods On September 23, 1998, Thorpe excavated approximately 166 yd of impacted soil. The soil was transported directly to Forward Inc. landfill for disposal. A strong petroleum odor and some visible discoloration were noted in the upper portion of the removed soil. As soil removal continued, the bottom of the excavation began to clean up, and the west and south walls appeared to have only occasional areas of minor contamination. However, the north and east walls still showed evidence of discoloration. As an early interum remedial action beginning on August 16, 2001, Ground Zero actively bailed product from well MW 1. Beginning in November 2003, the groundwater treatment system (GWTS) was used for groundwater remediation.Between August 2001 and December 2003 approximately 180 gallons of free product/water mixture was removed by bailing. The GWTS was put into operation on November 5, 2003 and was shut-down on February 10, 2009 after treating 4,457,049 gallons of petroleum impacted groundwater. Between November 2003 and February 2009 approximately 125 lbs of TPHg, 14 lbs of benzene, and 44 lbs of MTBE were removed by the GWTS. The VTS was placed in operation on August 8, 2005 and was shut-down on February 10, 2009 after _ determining that the VES was extracting between 0.7 and 1 pound per day of petroleum hydrocarbons. Between August 2005 and February 2009 approximately 2,500 lbs of TPHg were removed by the VTS. 14.0 BAT Discussion Following is a very brief summary of conventional and accepted remediation techniques along with reasons that they are not viable in attaining background conditions: • Excavation o The former UST pit was over excavated to the point were the bottom of the excavation began to clean up, and the west and south walls appeared to have only occasional areas of minor contamination. The north and east walls still showed evidence of discoloration.