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19 February 1997 <br /> AGE-NC Project No. 95-0185 <br /> Page 3 of 4 <br /> Analytical Results of Ground Water Samples. The laboratory report (MAI Laboratory I.D. Nos. <br />' 71805 to 71808), and chain-of custody form are included in Appendix B. <br />' 4.0. CONCLUSIONS AND RECOMMENDATIONS <br /> 4.1. CONCLUSIONS . <br /> The following conclusions were drawn from the results of this investigation: <br /> • TFH and several BTE&X compounds were detected this quarter in samples collected from <br /> three of the four ground water monitoring wells. <br />' Well MW-2 appears to be beyond the southern edge of the dissolved hydrocarbon plume and <br /> monitoring well MW-3 appears to be near the western boundary of the hydrocarbon plume. <br /> • The northern and eastern margins of the ground water plume have not been delineated. <br /> • AGE anticipates that additional investigation north and east of the site will be required to <br /> Mdetermine the lateral extent of impacted soil and ground water. <br />' 4.2. RECOMMENDATIONS <br /> 1 Based on the results of this investigation, AGE recommends the following: <br /> • To further delineate the dissolved hydrocarbon plume, we recommend the collection of a <br />' minimum of four to five grab ground water samples. The samples should be collected to both <br /> delineate the hydrocarbon plume and provide information for the most effective placement <br /> of future ground water monitoring wells. Upon the request of the PHS-EHD, AGE will <br /> provide a site specific work plan addendum for the installation of additional wells. <br /> • Based on the current data the most likely placement of additional wells are as follows: one <br /> well should be installed north of MW-3; a second well should be installed northeast of MW- <br /> 4 along Wilma Avenue and the third well should be installed on the east side of the Highway <br /> 99 ramp. <br /> = = - • The next quarterly monitoring%should•be scheduled-for March 1997: <br />