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Gasoline DTW GWE B T E X MTBE TPH-G Oxygenates/ Additives E;Method (602)1(8021B) (602)/(8021B) (602)1(8021B) (602)1(8021B) {6(8021260)! 15m Sa21 BDetecfeet feet 0 3 /L 0 3 /L 0 3 /L 0 fi /L 1 0 IL 0 05 m /L 0 5-13 0 /L MON WELL TOC ELEV SV-1 41 000 17000 3300 6200 1,400 120 NA 1100 34 120 250 1,100 41 ND 210 3 0 31 110 1 000 1 6 NA SV-2 4123198 49 000 66 000 3200 17,000 26 000 270 NQ 7/2/02 53,000 36 000 5 100 24,000 ND 4 000 190 NA SV-3 7118197 71 000 73 000 3 900 19 000 35 000 280 NA 10/14/99 9 600 2 100 440 1 400 14 000 25 NA 712!02 22,000 8 700 2000 7 900 29,000 97 NA SV-4 7/22/98 71 000 47 000 1 700 9 400 170,000 390 ND 7111100 560 110 34 60 46 000 08 NA 712102 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 4117103 1 97 000 93 000 5 000 23 200 530 000 390 1 34 000 BA 7125103 80 000 80 000 4 400 20 200 550 000 500 80 000 BA 1119103 86 000 77 000 5 000 21 700 520 000 360 24 000 TBA 1130104 90 000 79 000 4 700 21 700 350 000 380 130 TBA 5!7104 85 000 81 000 5200 24 700 370 000 340 <500-<20 000 7122104 78 00070 000 4 800 23 000 410 000 260 <500-<20 000 F--5V-5 10/22/97 55,000 73 000 3 900 19 000 37 000 290 ND 7/2102 53 000 58 000 5 700 29 000 19 000 260 NA 5V-6 4121199 65 000 27 000 2 800 13 000 8 600 200 ND 712102 36 000 13 000 2 900 8 000 6,000 110 NA SV-7 8/1/96 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 Nb 4 000 250 NA 5V-8 1121/98 87 000 67 000 3200 1706-0 6 400 310 ND 712102 76 000 45,000 4,100 20 000 3 600 ND 1 000 NA SV-9 412197 25 000 ND 2 300 1900 79 000 53 NA 4112100 ND 150 ND 150 ND 150 ND 300 9 700 ND 25 NA 712102 35 7 2 54 11 380 000 27 NA DTW depth to groundwater GWE groundwater elevation TOC ELEV top of welt casing elevation B T EX benzene toluene ethyl benzene and total xylenes TPH-G total petroleum hydrocarbons quantified as gasoline MTBE methyl tertiary butyl ether 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 a=monitor well paved over and not located until after quarterly event was complete DTW not taken 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 80216 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 methyl tert butyl ether(MTBE),ethanol(EtOH) tertiary-butanol(TBA) di-isopropyl ether,(DIPE),ethyl-tert butyl ether(ETBE),ted-amyl methyl ether(TAME) 1 2-dichloroethane(1 2-DCA) and 1,2-dibromoethane(EDB)and were analyzed by EPA Method 82608 6) Elevations surveyed November 26 2001 to NAD 83/NAVD 68 referenced to NGS benchmark JS1384 Historical Groundwater Monitoring Data-July 2004 Page 10 of 10