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r ' since July 1998 We have had the tanks and piping of the tanks checked and there were i r no leaks found Since well BM-3 had no TPH or BTEC chemicals found in the water and MtBE was found creates an interesting problem The mole concentration of Benzene (1%), Toluene (11%), rEthyl benzene (2%) and mixed xylenes (11%) and MtBE (11%) in the average gasoline mixture has been calculated The solubility of Benzene (18 mg/L), Toluene (59 mg/L) Ethyl benzene (3 mg1L) Xylenes (19 mg/L) and MtBE (5200 mg/L) is known Because rMtBE is very soluble and the BTEX chemicals are less soluble we would expect the BTEX chemicals to be less concentrated than MtBE, however, they should also be present if the 5 gasoline entered the water nearby The fact that none of the BTEX and TPH chemicals 4 " rare present indicates that the source of the MtBE is not entering the water near well BM-3 a``r Dissolved oxygen levels were recorded this quarter at this site The levels were r measured with a calibrated YSI model 51 B meter by placing the sensor 5 feet below the surface of the water table after the bailing of the wells The measured levels are shown on Table 3A and showed in Figure 5. ' VAPOR EXTRACTION SYSTEM r This site has been under remediation since July 1997 A total of 46,371 pounds of gasoline has been removed since the beginning of this project This system was not operating most of this quarter because of equipment problems See Table 5 rConclusions r We will continue to monitor this site The next monitoring event will take place in July 2002 We request that wells BM-6 and BM-8 no longer be sampled during the quarterly rmonitoring These wells are located next to wells BM-2 and BM-13, which are shallow wells where the water is sampled from the surface to 45 feet, where as BM-6 and BM-8 rare deep wells and samples are taken from water, which is below 45 feet rYours truly, N aED GEO cly r �o � %`John Cussen �tc.6�06 2 RG #6506 E r q�ot7cALIV V,`P r r 2 r