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„ rl Gasoline DTW GWE B T E X MTBE TPH-G Oxygenates/ Additives EPA Method (602)1(8021B)/ (602)/(8021 B)1 (602)1(80218)1 (602)/(8021B)/ (602)!(8021 B)1 8015m 82608 (8020)/82608 (8020)/$2608 (8020)/8260B (8020)/82606 8020)1 826013 Detection Limits feet feet 0 3 pgIL 0 3 1L 0 3 /L 0 6 /L 1 0 /L 0 05 m /L 0 5-13 0 pgIL WELL ID TOC ELEV (DATE) SV-1 1/16/1997 41 000 17 000 3 300 6200 1 400 120 NA 1/15/2000 1100 34 120 250 1100 41 ND 7/2/2002 210 30 31 110 1 000 16 NA SV-2 4/23/1998 49 000 66 000 3200 17 000 26 000 270 ND 7/2/2002 53 000 36,000 5 100 24 000 ND 4 000 190 NA SV-3 7/18/1997 71 000 73 000 3 900 19 000 35 0001 280 NA 10/14/1999 9 600 2 100 440 1 400 14 000 25 NA 7/2/20C 1 22 000 8 700 2000 7,900 29 000 97 NA SV-4 7/22/1998 71 000 47 000 1 700 9 400 170 000 390 ND 7/11/2000 560 110 34 60 46 000 08 NA 7/2/2002 73 000 62 000 4 700 19 000 740 000 300 NA 10/15/2002 93 000 96 000 4 600 18 000 730 000 450 NA 1/15/2003 82 000 74 000 9 800 24 000 530 000 710 <5 000- <130000 4/17/2003 97 000 93 000 5 000 23 200 530 000 390 1 34 000 TBA 7/25/2003 80 000 80 000 4 400 20 200 550 000 500 80 000 TBA 11/9/2003 86 000 77 000 5 000 21 700 520 000 360 24 000 TBA 1/30/2004 90 000 79 000 4 700 21 700 350 000 380 130 BA 5/7/2004 85 000 81 000 5200 24 700 370 000 340 <500-<20 000 7/22/2004 78 000 70 000 4 800 23 000 410 000 260 <500-<20 000 10/14/2004 67 000 64 000 a 100 20 000 310 000 1 250' <500-<20 000 SV-5 10/22/1997 55,000 73 000 3 900 19 000 37 000 290 ND 7/2!2002 53 000 58 000 5 700 29 000 19 000 260 NA SV 6 4/21/1999 65 000 27 000 2 800 13 000 8 600 200 ND 7/2/2002 36 000 13 000 2 900 8 000 6 000 110 NA 5V-7 8/1/1998 91 000 75 000 3 000 18 000 7 800 1 360 NA 10/23/1998 1 1 1 90 000 1 77 000 3 300 18 000 1 800 1 360 ND 7!2!2002 73 OQO 57 000 4 300 22 000 NO 4 000 250 NA SV-8 1/21/1998 1 1 87 000 67 000 3200 17 000 6 400 310 ND 7/2/2002 76_000 45 000 4 100 20 000 3 600 ND 1 000 NA SV-9 4!2/1997 25 000 ND 2 300 1 900 79 000 53 NA 4/12/2000 ND 150 ND 150 NO 150 ND 300 9 700 NO 25 NA 71212002 35 7 2 54 11 38D 000 27 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 Ng/L=micrograms per liter=parts per billion(ppb) SV=Soil Vapor Extraction Well mglL=milligrams per liter=parts per million(ppm) NO=none detected at or above laboratory reported detection limit NO(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 for gasoline oxygenatesladditives 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 oxygenatesladditives include MTBE ethanal(EtOH) tertiary-butanol(TBA),di-isopropyl ether,(DIPE) ethyl-tert butyl ether(ETRE) tert-amyl methyl ether(TAME) 1 2-dichloroethane(1,2-DCA) and 1 2-dibromoethane(EDB)and were analyzed by EPA Method 8260B 6) Elevations surveyed November 26 2001 to NAD 83/NAVD 88 referenced to NGS benchmark JS1384 �) As of the fourth quarter 2004,BTEX and other oxygenates/additives are analyzed by EPA Method 82606(current laboratory analytical method is shown in bold-faced type) Historic Groundwater Monitoring Data-October 2004 Page 10 of 10