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extraction and groundwater pumping and treatment Please see Appendix B, <br /> Groundwater Monitoring Results <br /> 5 Effective operation of the Soil Vapor Extraction system (SVE) and groundwater <br /> treatment occurred from 1990 to 1994 as confirmed by accelerated removal of <br /> dissolved TPH-g and benzene from the groundwater However, after removal of 99% <br /> of the benzene and 69% of the TPH-g mass, removal rates decreased to asymptotic <br />' levels typical of intrinsic removal rates Please see Appendix B, Groundwater <br /> Monitoring Results <br />' 3.0) SITE DESCRIPTION <br /> The former Regal station # 603 is presently an operating EXXON station located in section 2I, <br /> T2N, R6E,MDB&M at approximately 12' above mean sea level (MSL) (See Figures 1 and 2) The <br /> parcel is#31 and is recorded in Assessor's Book 97 <br />' 4.0) SITE TESTING AND REMEDIATION <br /> October 24, 1988 <br />' USTs and dispensing piping removed, first discovery of gasoline tainted soil <br /> December 9, 1988 <br /> Workplan to drill and sample six exploratory bonngs and install 3 groundwater monttonng wells <br /> (MW 1, MW2 and MW3) <br /> 1 March 3, 1989 <br /> Installation of additional seven groundwater monitoring wells, delineation of groundwater plume <br /> (MW4, MWS, MW6, MW7, MW8, MW9, and MWIO) <br /> October 10, 1989 <br /> Installed pumps into MW1 and MW3 for free product removal, recovered 40 gallons of gasoline <br /> and reduced thickness of product in wells from 1 26 feet at MW 1 and 1 66 feet at MW3 to a <br /> sheen <br /> January 15, 1991 <br /> Vapor extraction source test <br /> October 10, 1991 <br /> Start-up of soil vapor extraction system (SVE) <br /> September 28, 1992 <br /> Completion of two downgradient wells (MW 1 I and MW12) <br /> 1 <br />