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3.0 MONITORING RESULTS SUMMARY 3.1 Groundwater Physical Cligracteristies and Grgundwater Gradient Contu Table 1 presents a summary of the groundwater physical characteristics and water level measurements collected at each well during the June 16, 1995 monitoring event TABLE 1 Field Monitoring Data Well pH Temperature Electrical Reference Elevation' Depth to Water June 1995 ID (units) (° F) Conductivity Top of Casing From Reference Water Elevation' (umhos) (feet) (feet) (feet) ' MW-1 7 73 656 876 2093 1 4287 -2194 MW-2 768 688 915 21 34 432 -21 86 MW-3 7 49 69 8 1079 21 07 42 88 -21 81 Notes `Elevations are given in feet relative to mean sea level (MSL) Groundwater elevations have increased an average of 0 9 feet since the last date when measurements were made (March 17, 1994) This increase in groundwater elevation reflects the recent, unusually high winter season rainfall in the San Joaquin Valley region The groundwater elevations were used to produce a contour map showing the groundwater surface at the facility relative to mean sea level (Figure 3) From the data, WESTON has calculated a horizontal gradient for the groundwater surface The average horizontal gradient at the site is 2 4 x 103 feet/foot with groundwater flow toward the north by northwest. In comparison to data collected in March 1995, the contour map shows the hydraulic gradient has decreased slightly from 3 0 to 2 4 x 10-3 ft/ft and the flow direction has rotated from slightly east of north to slightly west of north 3.2 Analytical Results All groundwater samples were analyzed for BTEX by EPA Method 8020 and for TPH-D by EPA Method 8015M The analytical results are summarized in Table 2 while the complete analytical report is presented in Appendix B L WROIEM1SANJOQ\TMAD-2ND QTR 4 3lulJ'X995