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22 November 1996 AGE-NC Project No. 95-0185 Page 3 of 4 ' form are included in Appendix B. ' 4.0. CONCLUSIONS AND RECOMMENDATIONS I i 4.1. CONCLUSIONS The following conclusions were drawn from the results of this investigation: ' TPH and several BTE&X compounds were detected this quarter in samples collected from three of the four ground water monitoring wells. ' MTBE was not detected in the water samples collected from the monitoring wells this quarter. • Well MW-2 appears to be beyond the southern edge of the dissolved hydrocarbon plume and ' the location of monitoring well MW-3 appears to be near the western boundary of the hydrocarbon plume. • The northern and eastern margins of the ground water plume have not been delineated. • AGE anticipates that additional investigation north and east of the site will be required to determine the lateral extent of impacted soil and ground water. 4.2: RECOMMENDATIONS ' Based on the results of this investigation, AGE recommends the following: • For the delineation of the dissolved hydrocarbon plume, we recommend the collection of ' a minimum of four to five grab ground water samples. The samples should be collected to both delineate the hydrocarbon plume and provide information for the most effective placement of future ground water monitoring wells. AGE will provide a site specific work ' plan addendum for the additional well installation, upon the request of the PHS-EHD. • Based on the current data the most likely placement of additional wells are as follows: one well should be installed north of MW-3; a second well should be installed northeast of MW- T along-Wilma Avenue and the third well should be installed on the east side of the Highway 99 ramp. • The next quarterly monitoring should be scheduled for December 1996.