Laserfiche WebLink
Quarterly Monitoring Report, July 2000 <br /> Canepa's Car Wash (Pacific Avenue) <br /> Page -3 <br /> The groundwater samples obtained from MW- 1 , MW-3, and MW-7 were collected by filling two 40- <br /> milliliter glass vials with groundwater directly from the pump discharge tubing at a reduced rate. The <br /> sample containers were labeled, placed in a cooler chilled with ice, and delivered, in accordance with <br /> chain-of-custody procedures, to GeoAnalytical Laboratories, Inc. in Modesto, California, for analyses. <br /> 4.0 GROUNDWATER MONITORING RESULTS <br /> 4.1 GROUNDWATER ELEVATION CONTOURS <br /> On July 10, 2000, the depth to groundwater was measured in each monitor well prior to the collection of <br /> groundwater samples. The average depth to groundwater was approximately 32. 8 feet below the well <br /> measuring points. The measuring points are slightly below the ground surface. The average depth to <br /> groundwater increased approximately 1 foot since the previous monitoring event conducted in April <br /> 2000 . The groundwater elevations ranged from 19.32 to 20 .33 feet below mean sea level (bmsl). The <br /> groundwater elevation contour map (Figure 2, Appendix A) indicates groundwater mounding in the <br /> center of the site in the vicinity of MW- I and MW-2. See Table 1 (below) for groundwater elevation <br /> data. A hydrograph of groundwater elevations is included as Figure 6, Appendix A. Note from the <br /> hydrograph in Figure 6 and a comparison of the top of the well casing screen interval versus the depth to <br /> water in Table l that all wells are drowned; i.e. the water table is 13 to 18 feet above the top of the <br /> screen. <br /> TABLE 1 <br /> GROUNDWATER ELEVATION DATA (JULY 109 2000) <br /> MW-1 THROUGH MW-8 <br /> Well Well Casing Well Collar Depth to Groundwater <br /> ID Screen Elevation Water Elevation <br /> Interval (feet) (feet) (feet) <br /> (feet - bgs) <br /> MW-1 50 - 70 13 .45 32.87 - 19.42 <br /> MW-2 50 - 70 13 .27 32.59 - 19.32 <br /> MW-3 50 - 70 13 .50 33 . 19 - 19.69 <br /> MW-4 50 - 70 13 . 82 33 .34 - 19.52 <br /> MW-5 50 - 70 12.69 32.35 - 19 .66 <br /> MW4 45 - 65 11 .62 31 .95 -20 .33 <br /> MW-7 45 - 65 13 . 18 33 . 50 20.32 <br /> MW-8 45 - 65 13 .26 32.95 - 19.69 <br /> 4.2 LABORATORY ANALYSES <br /> The groundwater samples were analyzed by GeoAnalytical Laboratories, Inc. for total petroleum <br /> hydrocarbons quantified as gasoline (TPH-G) by Method 5030/LUFT. The groundwater samples were <br /> n• <br /> Lir CONDOR <br />