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S fEC0R Attachment 2 Site History ,14 A feasibility study for groundwater treatment included a six month in-situ stable oxygen generator (ISO-GEN) pilot test that concluded in April 2002 This pilot test included the installation of six four-inch test wells (TW-1 through TW-6) and nine two-inch ISO-GEN monitoring wells (MW-24A through MW-32A) Changes to the groundwater monitoring and reporting program (MRP), included the r destruction of Ill MW-10, MW-11, MW-16, MW-17, MW-21 and MW-20, the installation of eleven two-inch A-zone monitoring wells (MW-43A through MW-53A), the installation of one two-inch B-zone monitoring well (MW-50B), and revised well name designations to denote the zone in which each well is screened across An offsite Investigation was completed in 2002, in the adjacent field to the west and north of the site, to further define the offsite hydrocarbon concentrations Each boring was advanced to approximately four feet below the first encountered groundwater Low levels of methyl tertiary butyl ether (Ill and TPHd were detected in shallow i l� groundwater samples On January 9, 2002, 15 soil samples were collected in and around the spill area where ll' ' less than 10 gallons of red dye diesel was released on December 28, 2002 Two-inch xy„ diameter borings were advanced to approximately 0 5 to 1 5 feet bgs Groundwater was not encountered during boring activities Borings were backfilled with native soil upon completion of soil sampling r f During July 2002, Chevron added facilities to comply with pending fuel additive I requirements This addition included an ethanol transfer facility On July 9, 2002 the "I'l pre- and post-removal characterization of the soil was performed within the footprint of ;C� 1 �. the ethanol transfer facility excavation Twenty soil borings were advanced in the footprint of the truck transfer area and in the ethanol pipeline area to pre-characterize the soil for disposal prior to excavation During construction, an environmental scientist ' provided construction support to Chevron's general contractor Analytical results from pre-characterization work and visual observations were used to segregate impacted soil �� from other material A total of 397 tons of soil was removed from the excavated area r44- and transported by Integrated Wastestream Management Inc (IWM) to Forward Landfills located in Manteca, California On July 10, 2002, monitoring well MW-14 and ISO-GEN S test well TW-3 were destroyed by Watermark Drilling of Woodland, California, a State- licensed well driller G � Cleanup and Abatement Order No R5-2002-0718 (CAO) was issued on August 15, 2002 by the California Regional Water Quality Control Board As required by the CAO, SECOR supervised Cascade Drilling Incorporated (Cascade) of Sacramento during the drilling of 21 soil borings (NSB-0 through NSB-4, NSB-6 through NSB-15, MW-61 UA, r F '� a