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1 <br /> Working to Restore Nature <br /> 1 <br /> Depth to water measurements are shown on Table 1, Results of Subjective Analyses and <br /> Groundwater Elevations <br /> Using the groundwater elevations from January 11, 1992 and November 29, 1993, we <br /> evaluated the groundwater gradient and direction of groundwater flow The direction of <br /> groundwater flow varied from the northeast to southeast with a gradient of 0 001 to 0 002, <br /> respectively The groundwater flow direction has fluctuated from northeast to southeast to <br /> east since January 1992 <br /> 3.0 PREVIOUS ENVIRONMENTAL WORK <br /> i <br /> 3.1 Subsurface Investigation <br /> Environmental work performed at the site between 1991 and 1993 has included drilling 20 <br /> soil bonngs onsite and five borings offsite, installing ten vapor extraction wells onsite (VW-1 <br /> through VW-10), five groundwater monitoring wells onsite (MW-1 through MW-5) and five <br /> groundwater monitoring wells offsite (MW-6 through MW-10), one air sparge well (AS-1), <br /> and three sparge monitoring points (MS-1 through MS-3) in the borings at the site <br /> Groundwater monitoring was initiated at the site in January 1991 and has been performed <br /> on a quarterly basis since The results of the subsurface investigation and quarterly <br /> monitoring are discussed in Section 4 0 <br /> 3.2 Vapor Extraction Test <br /> A one-day vapor extraction test (VET) was performed at the site on December 30, 1991 <br /> The VET had two objectives: (1) to collect site specific data and evaluate the feasibility of <br /> vapor extraction as a soil remediation alternative and (2) to evaluate the off-gas treatment <br /> alternatives, if applicable The results of laboratory analyses of the vapor samples indicated <br /> M3-rs 4 <br />