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R603 UPDATE-30 6/29/94 Gravity of 1 46 and solubility of 0 to and Tetrachloroethylene (Perk) -- Specific Gravity of 1 62 and solubility of 0 02o 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 June 22 , 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 September, 1994 3 . 0 RESULTS GROUND WATER SAMPLE RESULTS The ground water samples collected from monitor wells MW1 , MW6, MW9 and MW11 on March 4 , 1994 show below detection limits for all compounds tested using EPA method 8010 - Halogenated Volatile Organic Compounds 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 , see Table 1 Ground water samples were obtained from all of the monitoring wells on June 22 , 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 MW3 , MW8 , and MW12 Monitor wells MW4 , MW5 , MW6 , MW7 , MW9 and MW11 continue to be below detection limits MW1 showed a slight increase in Xylenes (from 3 ug/L to 7 ug/L) The other wells that have some degree of ground water contamination (MW2 , and MW10) showed increases in total petroleum hydrocarbons as gasoline, although MW10 showed decreases in the BTEX' s and MW2 showed increases in the BTEX' s, see Table 1, and Figure 5 The increase in contaminant concentrations found at MW2 , and MW10 is thought to be associated with the vacuum extraction at these wells, kAZhile the decrease at MTgS and M11.12 mai.' be 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 (6901) As of June 24 , 1994 the new replacement unit operated 11177 hours out of 15122 hours (74°6) , for a total of 25 , 629 out of 36170 hours (710) As of June 24 , 1994 an estimated 73860 pounds of gasoline range hydrocarbons have been destroyed, see Table 2 and 3 and Appendix C-Air PAGE 2