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Gasoline DTW GWE B T E X MTBE TPH-G Oxygenates! Additives EPA Method (602)1(8021 B)/ (602)1(8021 B)/ (602)/(8021B)/ (602)/(80218)1 (602)1(8021 B)/ 8015m 82608 (8020)/8260B (8020)/8260B (8020)/8260B (8020)/82608 (8020)/82 OB Detection Limits feet feet 0 3 /L 0 3 /L 0 3 pgIL 0 6 pRIL 1 0 VqtL 0 05 m /L 0 5-13 0 IL WELL ID TOC ELEV (DATE) SV-1 1116197 41 000 17 000 3 300 6,200 1 400 120 NA 1115100 1100 34 120 250 1100 41 ND 712102 210 30 31 110 __L000 16 NA SV-2 4123198 49 000 66 000 3200 17 000 26 000 270 ND 712102 53 000 36 000 5 100 24 000 ND 4 000 190 NA SV-3 7118/97 71 000 73 000 3 900 19 000 35 000 280 NA 10/14/999 600 2 100 440 1 400 14 000 25 NA 7/2/02 22 000 B 700 2000 7 900 29 000 97 NA SV-4 7/22198 71 000 47 000 1 700 9 400 170 000 390 ND 7111100 560 110 34 60 46 000 08 NA 7/2/02 73 000 62 000 4 700 19 000 740 000 300 NA 10/15/02 93 000 96 000 4 600 18 000 730 000 450 NA 1115103 82 000 74 000 9,800 24 000 530 000 710 <5 000- <130 000 4117/03 97 000 93 000 5 000 23 200 530 000 390 34 000 TBA 7125103 80 000 80 000 4 400 20 200 550 000 500 80 000 TBA 1119103 86 000 77 000 5 000 21 700 520 000 360 24 000 BA 1130104 90 000 79 000 4 700 21,700 350 000 380 130 TBA 517/04 85 000 81 000 5200 24 700 370 000 340 <500-<20 000 7122/04 78,000 70 000 4 800 23 000 410 000 260 <500-<20 000 10/14/04 67 000 64 000 4 100 20 000 310 000 1 250' <500-<20 000 1/24/05 77 000 68 000 4 9001 24 000 320 000 360 <500-<20 000 4/13105 77 000 58 000 3 900 18 800 320 000 280 <500-<20 000 SV-5 10/22/97 55000- 73 000 3 904 -190()o 37 000 290 ND 712102 53 000 58 000 5,700 29 000 19 000 260 NA SV-6 4121199 65 000 -27005---] 2 800 13 000 8 600 200 ND 712102 36 000 13 000 2 900 8 000 6 000 110 NA SV-71 811196 91 000 75 000 3 000 18 000 7 800 360 NA 10/23/98 90 000 77 000 3 300 18 000 1 800 360 ND 712102 73 000 57 000 4 300 22 000 ND 4 000 250 NA SV-8 1121198 87 000 67 000 3200 17 000 6 400 310 NO 7/2102 76 000 45 000 4 100 20 000 3 600 ND 1 000 NA SV-9 4/2/97 -25000 ND 2 300 1 900 79 000 53 NA 4/12/00 ND 150 NO 150 ND 150 ND 300 9 700 ND 25 NA 7/2/02 35 72 54 11 380 000 27 1 NA DTW depth to groundwater B T E X benzene toluene ethyl benzene and total xylenes GWE groundwater elevation TPH-G total petroleum hydrocarbons quantified as gasoline TOC ELEV top of well casing elevation MTBE methyl tertiary butyl ether MW=Monitoring Well pg1L=micrograms per liter=parts per billion(ppb) SV=Soil Vapor Extraction Well mg/L=milligrams per liter=parts per million(ppm) ND=none detected at or above laboratory reported detection limit ND(X)=none detected to a level of X NA=not tested for this analyte NS=not sampled #=monitoring well paved over and not located until after quarterly event was complete,DTW not taken =the sample chromatogram does not match the standard gasoline chromatogram Notes 1) As of the fourth quarter 1999,MTBE was analyzed by EPA Method 602, groundwater monitoring forgasoline oxygenatestadditives other than MTBE was discontinued 2) From October 1996 through July 1997 MTBE was analyzed by EPA Method 602 but the result was not confirmed by EPA Method 8260 3) As of the third quarter 2000 MTBE and BTEX are analyzed by EPA Method 8021 B 4) As of the fourth quarter 2002,MTBE and BTEX are analyzed by EPA Method 8020 5) As of the first quarter 2003 groundwater monitoring for other oxygenates/additives was reinstated The selected oxygenates/additives include MTBE ethanol(EtOH),terhary-butanol(TBA),di-isopropyl ether (DIPE) ethyl-ten butyl ether(ETRE),tert-amyl methyl ether(TAME), 481 2-dichloroethane(1 2-DCA),and 1 2-dibromoethane(EDB)and were analyzed by EPA Method 8260B ) Elevations surveyed November 26 2001 to NAD 831NAVD 88 referenced to NGS benchmark JS1384 7) As of the fourth quarter 2004 BTEX and other oxygenatesladditives are analyzed by EPA Method 82608(current laboratory analytical method is shown in bold-faced type) Ci 1707 Data April 2005 As Page 10 of 10