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I ' QUARTERLY MONITORING REPORT JANUARY, 1997 . CANEPA S CAR WASH 6230 Pacific Avenue Stocklon CA ' January 27 1997 4.3 Groundwater Gradient ' On January 15, 1997, the depth to groundwater was measured in each monitor well prior to the collection of groundwater samples The average depth to groundwater was approximately 42 1 feet below the ground surface (bgs) at the site Because monitor wells MW-1, MW-2, MW-3, MW-4, and ' MW-5 are screened from approximately 50 to 70 feet bgs, and monitor wells MW-6, MW-7, and MW- 8 are screened from approximately 45 to 65 feet bgs, the water level was above the top of the screen in each of the wells The groundwater elevation ranged from 29 66 to 28 65 feet below sea level ' (bmsl) See Table 2, below for groundwater elevation data Groundwater elevation contours are shown in Figure 3, Appendix A A hydrograph of groundwater elevations Is Included as Figure 4, Appendix A The accompanying Hydrograph Table includes historical groundwater elevation data TABLE 2 ' Groundwater Elevation Data (January 15, 1997) MW-1 through MW-8 ' Well Well Casing Well Collar Depth to Groundwater ID Screen Elevation Water Elevation Interval (feet) (feet) (feet) (feet - bgs) I MW-1 50 - 70 13 45 42 13 -2868 MW-2 50 - 70 1327 41 92 -2865 MW-3 50 - 70 13 50 4249 -2899 MW-4 50 - 70 13 82 42 58 -2876 MW-5 50 - 70 1269 41 53 -2884 MW-6 45 - 65 11 62 41 28 -2966 ' MW-7 45 - 65 13 18 4241 -2933 MW-8 45 - 65 1326 4231 -2905 I 5 0 DISCUSSION OF RESULTS ' Since the October, 1996, quarterly monitoring, the elevation of the water table has Increased approximately 2 3 feet During the past two (2) years, the depth to groundwater at the site has ranged from approximately 51 feet to 42 feet bgs The groundwater elevation contour map (Figure 3, Appendix A) indicates groundwater mounding in the center of the site around MW-1 and MW-2 This is generally consistent with previous monitoring results Attempts have been made in previous Page -4- k LJ CONDOR