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Gasoline DTW GWE B T E X MTBE TPH-G Oxygenates/ Additives (602)1(8021 B)1 (602)1(8021 B}! (602)1(8021 B)/ (602)/(8021 B)/ (602)1(8021 B)/ 8015m 8260B 020/82606 8020/82608 8020/82608 ::EPA feet feet 0 3 1L 0 3 !L 0 3 /L 0 6 /L 1 0 pgIL 0 05 m /L 0 5-13 0 /L 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 1 6 NA 5V-2 4/23/1998 49 000 66 000 3 200 17 000 26 000 270 ND 7/2/2002 53 000 36 000 5 100 24 000 ND 4 004 190 NA SV-3 7/18/1997 71 000 73 000 3 900 19 000 35 000 280 NA 10/14/1999 9 600 2 100 440 1 400 14 000 25 NA 7/2/2002 22 000 8 700 2000 7 900 29 000 97 NA SV-4 712211998 71 000 47,000 1 700 9 400 170 000 390 ND 7/1112000 560 110 34 60 46 000 0 8 NA 71212002 73 000 62 000 4 700 19 000 740 000 300 NA 1011512002 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 <130 000 4/17/2003 1 97 000 93 000 5 000 23 200 530 000 390 34 000 TBA 7/25/2003 80 000 60 000 4 400 1 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 TBA 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 4 100 20 000 310 000 250" <500-<20 000 1/24/2005 77 000 1 68 000 4 900 24 000 320 000 350 <500 SV-5 10122119971 55 000 1 73 000 1 3 900 19 000 1 37 000 1 290 1 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 SV-7 8/1/1996 91 000 75 000 3 000 18 000 7 800 360 NA 10/23/1998 90 000 77 000 3 300 18 000 1,800 360 ND 7/2/2002 73 000 57 000 4 300 22 000 ND 4 000 250 NA SV-8 1/21/1998 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 ND 150 ND 300 9 700 ND 25 NA 7/2/2002 35 72 54 11 380 000 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 pg/L=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 =Tha cmmnta rhmmoknnram doe, not ma+ch*he standard n ohne chromofnn rom - -- , - - - -va M ........ .. .... ...... ......y��„ .,.. .. ....g.. Notes 1) As of the fourth quarter 1999 MTBE was analyzed by EPA Method 602 groundwater monitoring for gasoline oxygenates/additives 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 oxygenatesladdttives include MTBE ethanol(EtOH),tertiary-butanol(TBA) di-isopropyl ether (DIPE) ethyl-tert butyl ether(ETBE) tent-amyl methyl ether(TAME) 1,2-dichloroethane(1 2-DCA),and 1 2-dtbromoethane(EDB)and were analyzed by EPA Method 8260E Elevations surveyed November 26 2001 to NAD 831NAVD 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-January 2005 Page 10 of 10