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R603 UPDATE-29 6/07/94 chemical analyses. The March 2, 1994 samples were analyzed for Halogenated Volatile Organics using EPA Method 8010 . The compounds of interest are associated with the Lincoln Village ground water plume (Dichloroethane (DCE) - Specific Gravity of 1 18 and solubility of 0 6%-, Trichloroethylene (TCE) - Specific Gravity of 1 .46 and solubility of 0 . 191; and Tetrachloroethylene (Perk) _ Specific Gravity of 1 62 and solubility of 0 . 021 . To obtain representative sample the bailers were weighted so as to sink them to the bottom of the shallow ground water wells to obtain the samples from the bottom of the well versus the top of the ground water in the well, as is done for gasoline range hydrocarbons - specific gravity 0 64 The March 29, 1994 samples were analyzed for TPH and BTEX concentrations using EPA Methods 8015 and 602 respectively Since diesel has never shown up in the sample results, the samples obtained on 11/27/90 and later were analyzed using EPA methods 5030 and 602 for Total Fuel Hydrocarbons and BTEX The next quarterly sampling will occur in June, 1994 . 3 . 0 RESULTS GROUND WATER SAMPLE RESULTS Ground water samples were collected from monitor wells MW1, MW6, MW9 and MW11 on March 4 , 1994 These wells are situated between the Lincoln Village ground water problem (ground water contaminated with DCE, PCE & TCE) and the active ground water remediation at this site The water samples collected were chain of custody delivered to Superior Precision Analytical , Inc for analysis using EPA method 8010 - Halogenated Volatile Organic Compounds Laboratory results show below detection limits for all compounds tested, see Appendix A and Table 1 Ground water samples were obtained from all of the monitoring wells on March 29 , 1994 for analysis of total petroleum hydrocarbons as gasoline (TPHg) and BTEX The latest sample results showed a decline in contaminant levels associated with the ground water at MW1, MW2 , and MW12 Monitor wells MW4 , MW5 , MW6 , MW7, MW9 and MW11 continue to be below detection limits The other wells that have some degree of ground water contamination (MW3 , MW8 , and MW10) showed increases, see Table 1, and Figure 5 The ,ncrems ,-� , i.. .ieuu-. lit cold-amj-n�nt- concentrations fl ound at 1Y43 , and 14-410 is thought to be associated with the increase in vacuum at these wells, while the increase at MW8 maybe associated with the drawing back of the plume to the site, see Table 1 VAPOR RECOVERY OPERATIONS AND RESULTS The original REMOX unit operated for a total of 14452 hours out Of a total of 21048 hours (69°;) As of May 25, 1994 the new replacement unit operated 10450 hours out of 14395 hours (73%-) , PAGE 2