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' ARCADIS 2009/2010 Annual <br /> Monitoring Report <br /> Union Pacific Railroad <br /> Company <br /> ' Former Maintenance Facility <br /> The TEPH-d SG data are used only for qualitative comparisons and are not used to Tracy,California <br /> delineate the dissolved TEPH-d plume. Laboratory reports and the data review <br /> ' memoranda are included in Appendix A. <br /> 5.0 Laboratory Data Review <br /> Analytical data were reviewed by Conestoga-Rovers &Associates following the Test <br /> Methods for Evaluating Solid Waste, Physical/Chemical Methods, SW-846, 3° Edition <br /> ' dated December 1996 and USEPA Contract Laboratory Program National Functional <br /> Guidelines for Low Concentration Organic Data Review dated June 2001.A <br /> memorandum summarizing the data review for each of the sampling events is included <br /> ' in Appendix A. No data qualifiers were assigned as a result of the data review. <br /> ' 6.0 Results <br /> This section presents the results of groundwater elevations and gradients,free-product <br /> ' observations and measurements,and analytical results. <br /> 6.1 Groundwater Elevations and Gradients <br /> Table 2 presents the depth-to-groundwater measurements and groundwater <br /> elevations. November 2009 groundwater elevation contour maps for the A-Zone and B- <br /> ' Zone wells are presented on Figures 3 and 4, respectively. March 2010 groundwater <br /> elevation contour maps for the A-Zone and B-Zone wells are presented on Figures 5 <br /> and 6, respectively.The groundwater gradients for the 2009/2010 reporting period are <br /> ' summarized here: <br /> • The November 2009 data indicate the gradient in the A-Zone was toward the <br /> ' north-northeast at approximately 0.003 feettfoot (ft/ft). The gradient in the B-Zone <br /> was also toward the north-northeast at approximately 0.002 ft/ft. <br /> • The March 2010 data indicated the gradient in the A-Zone was toward the <br /> northeast at approximately 0.003 ft/ft.The gradient in the B-Zone was also toward <br /> the northeast at approximately 0.003 Wit. <br /> ' • Groundwater gradients were not calculated for the C-Zone due to limited data. <br /> 1 <br /> P:WflG4GIS_DaeWgecbPdrve.Gnbn Pedflc pahoad,R M-Tm Y�GW.W11A rom1QGl Tl YeN GW'e➢0�2'IIGFIWLL.2W&2010RMel <br /> ' Page:3/7 <br />