ARCHIVED REPORTS_XR0006754 - Laserfiche WebLink

Home Browse Search

I ' QUARTERLY MONITORING REPORT JULY 1997 CANEPA s CAR WASH 6230 Pacific Avenue Stockton CA ' August 14 1997 4.3 Groundwater Gradient ' On July 17, 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 40 8 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 28 37 to 27 39 feet below sea level ' (bmsl) See Table 2, below for groundwater elevation data Groundwater elevation contours are showy 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 (July 17, 1997) MW-1 through MW-8, SV-3 Well Well Casing Well Collar Depth to Groundwater ID Screen Elevation Water Elevation Interval (feet) (feet) (feet) (feet - bgs) MW-1 SO - 70 13 45 4090 -2745 IMW-2 50 - 70 1327 4066 -2739 MW-3 50 - 70 13 50 4129 -2779 MW-4 50 - 70 13 82 4135 -27 53 MW-5 50 - 70 1269 40 34 -27 65 MW-6 45 - 65 11 62 3999 -2837 IMW-7 45 - 65 13 18 41 15 -2797 MW-S 45 - 65 1326 41 13 -27 87 ' SV-3 4078 ' 5 0 DISCUSSION OF RESULTS Since the April, 1997, quarterly monitoring, the elevation of the water table has decreased approximately one foot During the past three years, the depth to groundwater at the site has ranged from approximately 51 feet to 40 feet bgs The groundwater elevation contour map (Figure 3, Page -4- I �� CONDOR