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1 <br />' QUARTERLY GROUND WATER MONITORING REPORT <br /> 6131 Pacific Avenue Stockton California <br /> Page 5 <br /> a south to southeasterly direction. The calculated average <br />' hydraulic gradient has remained constant at approximately 0. 008 <br /> feet per foot (ft/ft) during the last half of the 1990 reporting <br /> period. <br /> Ground water elevation contour maps were drafted from the ground <br /> water elevations measured during the third and fourth quarters of <br /> 1990 and are presented on Figures 2, 3 and 4. These contour maps <br /> indicate the flow direction and calculated hydraulic gradient. <br /> 3.2 Ground Water Analytical Results <br />' The monitoring wells were purged and ground water samples were <br /> obtained from each well according to Aegis' Standard Operating <br /> Procedures outlined in Appendix A. <br />' An unmeasurable (trace) amount of free product was observed on the <br /> ground water surface in monitoring well MW-3 during the 10 January <br /> 1991 sampling. <br /> Laboratory analyses of the ground water samples collected from the <br /> monitoring wells are summarized in Table 2 . <br /> These results will be compared to ensuing ground water sampling/ <br /> results to determine if these conditions are an anomaly or a <br /> changing trend in ground water chemistry or flow. <br /> 4.0 SCHEDULE <br /> Aegis is currently negotiating with private property owners for <br /> right of entry and/or encroachment permits to install off site <br /> monitoring wells. The next quarterly monitoring is scheduled for <br /> March 1991. A work plan is in preparation to satisfy San Joaquin <br /> County requirements for application to install ground water <br /> monitoring wells to further define the horizontal extent of <br /> petroleum hydrocarbons in ground water. <br /> 90-020A RPT <br /> 90-020 OMR <br />