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since that time. A detailed description of GWE operations is presented in The RETEC <br /> Group,Inc.'s (RETEC's)January 30,2004 report. <br /> 1994 Subsurface Investigation: During July 1994, Pacific Environmental Group (PEG) <br /> investigated the horizontal extent of petroleum constituents in soil and grab <br /> groundwater. Soil, vapor, and groundwater samples were collected from 19 sample <br /> points (G-1 through G-19)located on and off site (PEG,August 1994). <br /> During December 1994, PEG further investigated the horizontal extent of petroleum <br /> constituents in soil and groundwater. Soil, vapor, and groundwater samples were <br /> collected from seven sample points (G-20 through G-26)located off site. <br /> 1995 Subsurface Investigation: During July 1995, PEG installed well MW-28. PEG also <br /> destroyed deep well DW-1 due to concern of poor well construction and replaced it <br /> with well DW-2. <br /> 1996-2001 Soil Vapor Extraction (SVE) Operations: SVE began on April 16, 1996 and <br /> operated intermittently until May 23, 2001. The SVE system consisted of a Thermtech <br /> VAC-250 thermal oxidizer unit that was connected to wells MW-1, MW-11, MW-15, <br /> MW-16, MW-17, MW-23, and MW-24. The system was shut down due to high water <br /> levels and the lack of available vadose screen for SVE (RETEC November 1,2004). <br /> 2000-2002 Subsurface Investigations: Toxichem Management System installed wells <br /> MW-29 through MW-34 and MW-13R. During October 2000,wells MW-29 and MW-30 <br /> were installed east of the tank farm near the former railcar unloading spur. During July <br /> 2001, wells MW-31 and MW-32 were installed east and northeast of wells MW-29 and <br /> MW-30 to provide off-site plume definition, and well MW-33 was installed to provide <br /> plume definition down gradient and southwest of the former unlined holding pond. <br /> During January 2002,well MW-13R was installed to replace MW-13. During April 2002, <br /> well MW-34 was installed to provide plume definition down gradient of the site near <br /> Hooper Drive and well MW-28. <br /> 2003 Subsurface Investigation: During March and April 2003, RETEC performed a <br /> direct push and well installation investigation to delineate the extent of petroleum <br /> constituents west of well MW-33 (RETEC, May 16,2003). Ten direct push borings (SB-1 <br /> through SB-10) were installed and depth-discrete groundwater samples were collected. <br /> Based on the groundwater analytical data,well MW-35 was installed. <br /> 2004 Subsurface Investigation: During October and November 2004, RETEC performed <br /> a direct push and well installation investigation to delineate the extent of petroleum <br /> 247729(aa) A-2 CiONESTOGA-ROVERS&ASSOCIATES <br />