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r April 27, 1999 Page 2 calculated as diesel (TPH-d),benzene,toluene, ethylbenzene, and xylenes (BTEX compounds) and methyl tert-butyl ether (MtBE) In addition, selected groundwater samples were analyzed for oxygenates The depth to water, and SPH thickness were gauged in each well Groundwater elevation and analytical data are presented in Table 1 A TPH-g/Benzene/TPH-d/MtBE concentration map for first quarter 1999, is shown as Figure 2 DISSOLVED-PHASE HYDROCARBONS Gasoline Hydrocarbons (TPH-g): TPH-g in groundwater samples was measured using EPA Method 8015 TPH-g was reported m 7 of the 24 wells sampled{MW-1, 3, 7, 8, 11, 15, and 16) Detected TPH-g concentrations ranged from 715 parts per billion(ppb)in MW-8 to 6,490 ppb in Well MW-3 Diesel Hydrocarbons (TPH-d): TPH-d in groundwater samples was measured using EPA Method 8015 TPH-d was detected in all wells sampled except for Wells MW-10,MW-22, MW-23 and WSW-1 Detected TPH-d concentrations ranged from 60 6 ppb in Well MW-13 to 2,600 ppb in MW-3 All TPH-d samples were filtered using a glass TCLP filter(0 7-micron)prior to laboratory extraction Benzene: Benzene in groundwater samples was measured using EPA Method 8020 Benzene was detected in 6 of the 24 wells sampled(MW-1,3, 11, 15, 16, and 21) Detected benzene concentrations ranged from 3 77 ppb in Well MW-15, to 649 ppb in MW-3 MtBE: MtBE in groundwater samples was measured using EPA Method 8020 MtBE confirmation analysis by EPA Method 8260 was performed on samples MW-2, 3, and 15 MtBE was detected in 13 of 24 wells sampled(MW-1, 3,4, 5, 7, 11, 15, 16, 17, 18, 19, 21, and T-3) Detected MtBE concentrations ranged from 7 58 ppb in Well T-3, to 9,980 ppb in Well MW-21 MtBE was at a historical high in Wells MW-17 and T-3 during the first quarter, 1999 Oxygenates: oxygenate analysis was performed on samples from Wells MW-2, MW-3 and MW-15 by EPA Method 8260, with the exception of methanol which was measured by EPA Method 8015 Tert-amyl methyl ether(TAME)was detected in Wells MW-3 and MW-15 at concentrations of 35 1 ppb, and 5 42 ppb, respectively No other oxygenates were detected during the first quarter, 1999 sampling event 920-002 2E/iQ99 DOC