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' Gasoline DTW GWE B T E X MTBE TPH-G Oxygenates/ Additives EPA Method (602)1(8021B)/ (602)1(8021 B)1 (602)/(80216)/ (602)!(8021 B)/ (602)/(80218)/ 8015m 82606 (6020) 82606 8020/82608 8020/82608 802018260B 802018260B WELL ib TQC ELEV (DATE) SV 1 1/16/1997 41 000 17 000 3 300 6200 1 4001 120 NA 1/15/2000 1 100 34 120 250 1 100 41 ND 7/212002 210 30 31 110 1 000 1 6 NA 9/12/2005 2,660 882 1,590 1,299 666 11 9 <50-<2 000 5V-2 4123!1998 49 000 1 66 000 3200 17 000 26 000 270 ND 712!2002 53 000 36 000 5 100 24 000 N D 4 000 190 NA 9/12/2005 25,400 10,300 3,750 16,350 2 000 102 <500 .420000 SV 3 7/10/1997 71 000 73 000 39 0 19 000 (350001 280 NA 10/14/1999 9,600 2,166__ 440 1 400 14,000 25 NA ' 7/2/2002 22 000 8 700 2000 7 900 29 000 97 NA 9/12/2005 21,500 4,630 4,790 16 640 4 870 101 <500-<20 000 SV-4 7122/1998 71 000 47 000 1 700 9 400 170 Dao 390 ND 7111/2000 560 110 34 60 46 000 08 NA 712!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 1115/2003 82 000 74 000 9 800 24 000 530 000 710 <5 000 <130,000 4/17/2003 97 000 93 000 5 000 23 200 $30000 390 34 000 TBA ' 7/25/2003 80 000 80 000 4 400 20 200 550 000 500 80 000 TBA 1119/2003 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 ' 10114/2004 67 000 64 000 4,100 20 000 310 000 1 250' <500-<20 000 1/24/2005 77 000 68 000 4 900 24 000 320 000 360 <500-<20 000 4/13/2005 77 000 1 58 000 3 900 18 800 320 000 280 <500 <2D 000 7/28/2005 63 000 53 600 3 970 17 850 317 000 355 <500 <20 00011 9/12/2005 49 800 39 000 <5 000 <15 000 485 000 235 <5000-<200 000 ' 10/13/2005 72,700 1 64,400 3,510 15.070 295,000 275 <500-<20 000 5V 5 10/22119971 1 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 9/12/2005 46,200 47,200 4,90() 22,240 4 400 219 <500 <20 000 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 11 n NA 9/12/2005 67,000 3,260 :3.130 4 688 1,280 1 137 <500-<20 000 SV 7 8/1/1996 91 000 75 000 3 000 18 000 7 800 380 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 9/12/2005 33,900 41,8 0 3,330 20,840 <500 205 i<500 <20 ODO 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 1 NO(1,000) NA 9/12/2005 65,300 33,100 3,310 10 330 2,130 188 <500-<20 000 ' SV 9 4/211997 25 000 ND 2 300 1900 79 000 53 NA 4/12/2000 ND 150 ND 150 ND 150 ND 300 __9790 ND 25 NA 7/2/2002 1 35 72 54 11 380 000 27 NA 9/1212005 1 <50 <50 <50 <150 16.800 04 <50<2000 ' 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 Ng1L=micrograms per liter=parts per billion(ppb) SV=Soil Vapor Extraction Well mg/L=msl€igrams 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 for gasohne oxygenates/additives other than MTBE was discontinued 21 From October 1996 through July 1997 MTBE was analyzed by EFA Method 602 but the result was not confirmed by EPA Method 8260 3) As of the thud 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) tertiary-butanol(TBA) di-isopropyl ether (DIPE) ethyl-tert butyl ether(ETRE) tart amyl methyl ether(TAME) ' 1 2-cflchloroethane(1 2 DCA) and 1 2-dibromoethane(EDB)and were analyzed by EPA Method 8260B 6) Elevations surveyed November 26 2001 to NAD 83/NAVO 8a referenced to NGS benchmark JS1384 7) As of the fourth quarter 2004 BTEX and other oxygenates/additives are analyzed by EPA Method 82608(current laboratory analytical method is shown in bold-faced type) P 11000_pg41707 Canepe51707D Groundwater MomtonngSReports�Reportsl4COS QMR12005 4th gtr%AppendixlCl 1707 Data Oct 2005 AS Page 10 of 10