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F <br /> iY $ <br /> l <br /> UA T R Y MONITORING REPORT•FOURTH QUARTVR 1991 <br /> 7910 Lower Sacramento Road <br /> Stockton, California <br /> Shell W1c No.204.7524.080d <br /> Delta Project No.40-88.147 <br /> Pago 2 <br /> piping. Mr. John Kindrick is the current station operator and has leased the facility from Shell for <br /> approximately 11 years. <br /> Previous work performed by Delta includes investigation for petroleum constituents in the sail and ground <br /> water at the site, assisting in the replacement of the underground storage tanks,quarterly water elevation <br /> measurements, and quarterly sampling of ground water for laboratory analysis. The previous activities <br /> performed at the site and results obtained are presented in the fallowing reports prepared by Delta: <br /> Report. <br /> Date <br /> April 19, 1988 <br /> Proposed Work Plan <br /> Phase I Hydrogeologic Assessment Work Plan <br /> March 31, 1989 <br /> Tank Closure Report <br /> April 5, 1989 <br /> Phase I Hydrogeologic Assessment Report <br /> October 20, 1989 <br /> Problem Assessment Report <br /> ,October 15, 1990 <br /> Quarterly jllonitoring Report, Fourth Quarter 1990 December 26, 1490 <br /> Quarterly Monitoring Report, First Quarter 1991 April 8, 1,991 <br /> Quarterly Monitoring Report, Second Quarter 1991 July 3, 1991 <br /> Quarterly Monitoring Report, 77tird Quarter 1991 September 27, 1991 <br /> 3.0 PRO ECT RESULTS <br /> 3.1 Ground Water Elevation Data <br /> Depths to ground water were measured at monitoring wells 1 IW-1, 41W-2, and MW-3 on November 21, <br /> e 1. Using ground water elevation,data collected <br /> 1991. Groundwater elevations are summarized in Tahl <br /> during the November21, 1991, sampling event, the ground water tlow direction was towards the <br /> southeast at a hydraulic gradient of approximately 0.001. A ground water contour map based on <br /> measurements collected on November 21, 1991, is illustrated in Figure 3. <br /> QhtRt09JDM <br />_ r <br /> I Ing <br /> IR <br /> Rn _rs -`.ti 1 <br /> ALA <br />