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File No 93342-SGI Page 3 C. BACKGROUND The followingchronology ogy of investigative and remedial activities were performed and reported at the site by the contractors and consultant in charge of the activities 1 Soil sampling at the location of former product lines and stockpiled soil This f investigation was conducted on May 20, 1993 by Advance Soil Technology, Inc and the report was presented on June 2, 1993 The results of this limited investigation indicated contamination in the soil at the location of the product line trenches 2 On June 30, 1993 Walton Engineering, Removed three underground storage tanks (two 7500 gallon, and one 5000 gallon). Soil and groundwater sampling performed at the side walls and bottom of the excavation revealed contamination in the soil Also, a groundwater sample collected from the bottom of the excavation revealed contamination in the grab groundwater sample The results of this investigation was presented in the Advance Soil Technology, Inc report, File No 93342-TR dated July ✓ 9, 1993 3 On July 13, 1993, a representative of Advance Soil Technology Inc collected soil samples from the stockpiled soil (generated from tank removal) at the site The results of this investigation and sampling was presented in our report, File No 93342-NSP Dated July 19, 1993 4 On July 21 and 22, 1993 the stockpiled soil at the site was removed to a new location at the end of Toste Road for aeration purposes The results of this activity was presented in our report, File No 93342-RSP dated July 29, 1993 i 5 Aeration of stockpiled soil commenced on August 16, 1993 and continued until the sampling day of September 24, 1993 The results of sampling revealed no detection of the contaminants in the soil The result of this activity was presented in our report, File No 93342-ASP dated October 4, 1993 iADVANCE SOIL TECHNOLOGY, INC