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R603 UPDATE-26 2/28/94 <br /> effective potentiometric lows at these wells, with flow occurring <br /> towards MWIO . <br /> Currently the ground water is in a continuation of a recharge <br /> cycle produced from the Spring of 1993 precipitation, see Depth <br /> to Water measurements on Table 1 . As would be expected, changes <br /> in vacuum at the wells influences the shape of the potentiometric <br /> surface <br /> GROUND WATER QUARTERLY SAMPLING <br /> Ground water samples were collected on December 22, 1993 , see <br /> Table 1 . These samples were collected by a WEGE Geo-technician <br /> and "Chain of Custody" delivered on ice to a State certified <br /> testing laboratory (SUPERIOR PRECISION ANALYTICAL, INC. DHS <br /> #1332) for chemical analyses These samples were analyzed for <br /> TPH and BTEX concentrations using EPA Methods 8015 and 602 <br /> respectively. Since diesel has never shown up in the sample <br /> results, the samples obtained on 11/27/90 and later were analyzed <br /> using EPA methods 5030 and 602 for Total Fuel Hydrocarbons and <br /> BTEX. The next quarterly sampling will occur in March, 1993 <br /> 3 . 0 RESULTS <br /> GROUND WATER SAMPLE RESULTS <br /> Ground water samples were obtained from all of the monitoring <br /> wells on December 22, 1993 <br /> The latest sample results showed a continual decline in <br /> contaminant levels associated with the ground water at MW1, MW2 , <br /> MW4, and MW8 The other wells that have some degree of ground <br /> water contamination (MW3, MW10, and MW12) showed increases, see <br /> Table 1, and Figure 5 . <br /> The increase in contaminant concentrations found at MW3 , MW8 and <br /> MW12 is thought to be associated with the vacuum extraction <br /> system being turned off at tames due to equipment modifications <br /> (heat exchanger addition) and equipment check (increased noise <br /> from compressor) , see Tables 1 and 3 . <br /> VAPOR RECOVERY OPERATIONS AND RESULTS <br /> On December 18, 1993 , the REMOX unit was off . During this site <br /> visit a WEGE technician tried to restart the unit, but could not . <br /> A REMOX technician, after some repairs, restarted the unit noon <br /> February 2 , 1994 The REMOX units have operated for a total of <br /> 11515 hours out of a total of 18329 hours (63g) The new <br /> replacement operated 7767 hours out of 11712 hours (66%;) An <br /> estimated 72119 pounds of gasoline range hydrocarbons have been <br /> destroyed, see Tables 2, and 3 and Appendix D-Air Monitoring <br /> Report . <br /> Since February 18, 1993 the vapor recovery/destruction has been <br /> declining from an average above 200 pounds per day of gasoline <br /> PAGE 2 <br />