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MtBE was detected in wells BM-1, BM-3 and BM-5 TBA (tertiary Butanol) was found in <br /> wells BM-1, BM-3, BM-7, BM-9 and BMA 1 It appears that some of the TBA is entering <br /> this site from the ARCO Station, as are the BTEX and TPH chemicals The MtBE plume <br /> appears to be centered at well BM-3 as it has been in the past since July 1998 We have <br />' had the tanks and piping of the tanks checked and there were no leaks found <br /> Dissolved oxygen levels were recorded this quarter at this site The levels were <br />' measured with a calibrated YSI model 51 B meter by placing the sensor 5 feet below the -0 <br /> surface of the water table after the bailing of the wells The measured levels are shown <br /> on Table 3A <br />' As requested in the EHD letter dated January 10, 2000, a plot of the wells and the old and w <br /> new piping runs of the dispenser lines is shown in Figure 6 <br />' VAPOR EXTRACTION SYSTEM <br /> This site has been under remediation since July 1997 A total of 46,371 pounds of <br />' gasoline has been removed since the beginning of this project The system removed 870 <br /> pounds this quarter See Table 5 <br />' Conclusions <br /> We will continue to monitor this site The next monitoring event will take place in January <br /> 2002 <br /> We request that wells BM-6 and BM-8 no longer be sampled during the quarterly <br />' monitoring These wells are located next to wells BM-2 and SM-13, which are shallow <br /> wells where the water is sampled from the surface to 45 feet, where as BM-6 and BM-8 <br /> are deep wells and samples are taken from water which is below 45 feet <br /> Attached is a non-Hazardous waste Manifest for the removal for purge well water <br /> Yours truly, ' <br /> n S, ED <br /> Cuss <br />' John Cussen <br /> RG #6506 �. <br /> 9 OF CALIE� P <br /> 1 <br /> 1 <br />