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r ih A S S O C I A T E S I N C ug/L, 22,000 ug/L, and 20,000 ug/L The highest concentration of ethylbenzene was in MW6 at 4,500 ug/L Groundwater samples collected from wells MW4 and MWS contained the lowest concentrations of TPHg and/or BTEX constituents The groundwater samples collected from MWS, MW9, and MW10 contained no detectable concentrations of TPHg or BTEX Groundwater samples collected from wells MW4 and MW7 contained detectable concentrations of MTBE by EPA Method 8021B, but confirmation by EPA Method 8260B indicated the MTBE results were false positive Analytical results of groundwater samples are summarized in Table 2 Laboratory data sheets and chain-of-custody documentation are contained in Attachment 2 FILTRATION SYSTEM In May 2002, a carbon filtration system consisting of two 200-pound high pressure liquid phase carbon canisters was installed to remove petroleum hydrocarbons from the water in domestic well DW On July 2,"July 20,/July 28,August 30;and September 28, 2004, water samples were collected from the first and second effluent ports identified as ICC Effluent (sample after the first carbon canister) and 2CC Effluent (sample after the second carbon canister) in the filtration system During the July 2, 2004, sampling event, petroleum constituents from 2CC Effluent were detected, but petroleum constituents from ICC Effluent were reported as not detected ATC collected additional samples from 1 CC Effluent and 2CC Effluent on July 20 and July 28, 2004 to verify results from the July 2, 2004 sampling event Results of both sampling events j indicate the 2CC Effluent and 1 CC Effluent sample were inadvertently switched during the July 2, 2004 sampling event Data from the July 20, July 28, August 30, and September 28, 2004, sampling events indicate that breakthrough has occurred in carbon vessel one ATC is scheduling the replacement of the carbon vessel It appears the filtration system is effective in removing petroleum products from groundwater extracted by well DW Analytical results are summarized in Table 2 and analytical data is contained in Attachment 1r0A ' CW I w E ADDITIONAL SITE ACTIVITIES On July 20, 2004, ATC personnel collected groundwater samples from domestic wells located on yY►" the south side of Munford Avenue The groundwater samples, identified as DW 3602, DW 3604, and DW 3606, were collected from domestic wells located at 3602 Munford Avenue, 3604 Munford Avenue, and 3606 Munford Avenue Prior to collection of groundwater samples, the surge tank from each well was emptied by pumping the water The wells were sampled from sample ports located at each well head The groundwater samples collected from each well were submitted to Argon Laboratories Inc (for chemical analyses of TPHg utilizing EPA Method 801513, BTEX utilizing EPA Method 8021B, and MTBE, ETBE, DIPE, TAME, TBA, 1,2-DCA, EDB, ethanol, and methanol utilizing EPA Method 8260B None of the groundwater samples contained detectable concentrations of petroleum hydrocarbons S\I63931REPQRTS13gr-2004 doc 4