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Gealaglcal Teclucics Inc. Page 8 <br /> ' Well Installation and Quarterly <br /> Groundwater Monitoring Report <br /> Project No. 1030.2 <br /> June 18,2002 <br /> Site-specific groundwater bearing and slope were calculated and found to be N55°E @. <br /> ' 0.0042 ft/ft. These results are consistent with historical groundwater bearing and slope for <br /> this site. <br /> tGroundwater elevation, bearing and slope were calculated from data gathered during the <br /> June 11, 2002, monitoring event and the results are summarized in Table 1 of Appendix A. <br /> 4.0 CONCLUSIONS AND RECOMMENDATIONS <br /> 1 This investigation was an effort to define the vertical extent of the plume, evaluate the <br /> lateral migration of the plume and determine if gasoline range petroleum hydrocarbons have <br /> ' impacted deep groundwater under the site. The following conclusions have been drawn <br /> from the data generated from this site investigation work: <br /> ' Conclusions <br /> * Groundwater analyses of MW-101 suggest there are no gasoline range petroleum <br /> @ hydrocarbons impacting deep groundwater at this site. <br /> * Results from MW-1 suggest contamination sorbed to the soil surrounding the <br /> monitoring well has been released by higher groundwater elevation. <br /> ' * Results from MW-4 suggest minimal if any lateral migration has occurred at the site. <br /> * The plume has been defined vertically and laterally. <br /> * The clay layer at 19 feet bgs provides a significant barrier to vertical plume migration. <br /> ' Recommendations <br /> ' * Groundwater monitoring should continue on a quarterly basis to determine if seasonal <br /> fluctuations in groundwater elevation impact contaminant concentrations at the site. <br /> * Test for biodegradation indicators: <br /> o EC, DO, ORP <br /> o Nitrate as Nitrogen <br /> o Total Iron <br /> ' o Sulfate <br /> o Total alkalinity <br /> * Dispose of soil and purge water stored at the site. <br />