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Gasoline DTW GWE B T E X MTBE TPH-G Oxygenates/ Additives EPA Method (602)/(8021B) (602)/(8021B) (602)/(8021B) (602)1(8021B) (6028Y(82B)60)/ /82660)1 50301LUFT • Detection Limits feet feet 0 3 1L 0 3 1L 0 3 /L 0 6 IL 1 0 IL 0 05 m IL 0 5-13 0 g/L MON WELL (DATE.) TOC ELEV SV-3 7118197 71 000 73 000 3 900 19 000 35 000 280 NA 10/14/99 9 6D0 2 100 440 1 400 1 14 000 25 NA 7002 22 000 8 700 2000 7 900 29 000 97 NA SV-4 7122198 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 c130 000 4117/03 97 000 1 93 000 5 000 23 200 530 000 390 1 34 000TBA 7125103 80 000 80 000 4 400 20 200 550 000 500 80 000 TBA SV-5 f 10122197 1 55 000 73 000 3 900 19 000 37 000 290 ND 7/2102 1 53 000 58 000 5 700 29 000 19 000 260 NA SV 6 4/21199 65 000 27 000 2 800 13 000 8 600 200 ND 712102 36 000 1 13 000 J___2_900 8 000 6 000 110 NA SV-7 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 NQ 4 000 250 NA SV-8 1121198 87 000 67 000 3200 17 000 6 400 310 ND 712102 76 000 45 000 4 100 20 000 3 600 NO 1 000 NA SV-9 412197 25 000 ND 2 300 1 900 79 000 53 NA 4112100 ND 150 NO 150 ND 150 ND 300 9 700 ND 25 NA 712102 1 35 72 54 11 380 000 27 NA DTW depth to groundwater GWE roundwater elevation TOC ELEV top of well casing elevation 8 T E X 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 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 oxygenatesladditives was reinstated The selected oxygenatesladdltives Include methyl tert butyl ether(MTBE) ethanol(EtOH) tertiary-butanol(TBA) di-Isopropyl ether (DIPE) ethyl-tert butyl ether(ETBE) Cert-amyl methyl ether(TAME) 1 2-dlchloroethane(1 2-DCA) and 1 2-dlbromoethane(EDB)and were analyzed by EPA Method 82608 6)Elevations surveyed November 26 2001 to NAD 831NAVD 88 referenced to NGS benchmark JS 1394 1707 Data 3rd-03 xis(Table A) Page 6 of 6