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4 Benzene 5100 MW11 Toluene 4 260 (not located to scale) N Groundwater Ethylbenzene 1260 (NM) GWXylenes 3 620 Benzene 230 Benzene 190 Flow Direction TPH-g 39,700 Benzene 193 Toluene 485 Toluene 28 ' 0 25 50 Gradient = 0 005 MTBE(8260) <0 5 Toluene 31 9 Ethylbenzene 2 990 Ethylbenzene 2 2 Ethanol <100 Ethylbenzene 209 Xylenes 11 100 Xylenes 8 6 Scale(feet) Xylenes 644 TPH-g 45 000 TPH-g 1 320 TPH-g 4,000 MTBE(8260) <0 5 MTBE(8021) 148 ' Benzene 188 MTBE(8021) 414 Ethanol <100 MTBE(8260) <0 5 (-14 M 46) Toluene 83 MTBE(8260) <0 5 W 3 Ethylbenzene 36 5 1 Xylenes 221 TPH-g 1530 MTBE(8021) 258 I MTBE(8260) <0 5 Benzene 946 Toluene 2 830 Benzene 941 Ethylbenzene 788 Benzene <05 ' Xylenes 3 310 �t�`� Toluene 29 2 Toluene enzene 112 Benzene 260 y -g GN S ,�P4 Ethyl X tenes 134 <0 5 Toluene 9 680 TPH-g 20 000 HO p y Ethylbenzene <O� Ethylbenzene 1 780 MTBE(8260) <0 5 TPH-g 1,470 Xylenes <<0 Ethanol <100 NE MTBE{8021) 1 32 2 TPH-g 50 Xylenes 7 950 ' TPH-g 47 900 PFL1E MTBE(8260) <0 5 MTBE(8260) <0 5 MTBE(8021) 156 Oce-fG� Ethanol <100 MTBE(8260) <25 10?- ' 010 MW10 MW12 I Benzene 150Ess1 r, (NM) Toluene <0 5 pR v,�D�N (-1367) Ethylbenzene <0 5 ' MW9 xylenes <0 5 RW4 TPH-g 133 1 Benzene 5 020 (-1207) MTBE(8260) <0 5 V3 (-1366)66) Toluene 8 790 Ethanol <100 (-1303) (-1344) Ethylbenzene 1 240 UVB-MW2 (shallow) Xylenes 6 890 PSV1 } TPW-g 63,300 i E�E�E Benzene 140 (-1257) UVB MTBE(8021) <50 ` Toluene <05 RW2 � " (-1280) 0VB-MW1 (deep) (-13 10) I Ethylbenzene <0 5 �W6(Dry) Benzene 1,290 K Xylenes <0 5 NA 12 74 tis SW2 Toluene 162 TPH-g 331 sP ( ) p�PSV2 Ethylbenzene 54 8 Benzene 6 270 MTBE(8260) 855 (N Toluene 14 400 1 LEGEND Ethanol <100 i NM � Xylenes 237 ( } Ethylbenzene 2 740 MW4 '(NM) 3AB 1 TPH g 2 570 Xylenes 10 100 GROUNDWATER MONITORING WELL ZO (-1234 +iP2A1 (-12 57) MTBE(8260) <0 5 V2 Ethanol <100 TPH-g 79 700 • PIEZOMETER P1 1 SWI MTBE(8021) 128 O(NM) MW2 I 1 = N (-12 78)RW1 ', MTBE(8260) <25 i ♦ VAPOR EXTRACTION WELL - 1 (-1219) k V4_ (NM) 'S (-12 80) RECOVERY WELL Benzene 13 7 'd (-1243) MW s (-1264) Benzene 110 m 1 12 22 (-12 61) �� MW Toluene 978 OO PERMANENT SOIL VAPOR MONITORING WELL <05 IW1 (- ) �,� ti 5 � Benzene <05 Toluene Ethylbenzene 272 Ethylbenzene 39 Z • P2r� t� 5 ti� 'Oe?- Toluene <05 y AIR SPARGiNG WELL ti M i Xylenes 345 GR Ethylbenzene <0 5 XTPH-g 1 110 6 (NM�1 ti� �I` titi til S1 P,(kNE, \�ti' \� 1 Xylenes <0 5 TPN1) 4 060 INJECTION WELL �j ti ;\V-11 \ _— TPH-g <50 MTBE(8021) 43 5 MTBE(8260) <0 5 1 R �� SER [� MTBE(8021) <0 5 MTBE(8260) <0 5 (-1446) Groundwater Elevation (feet) Ethanol <100 m MW7 FPR p Y _ - FGEO. (NM) Not Measured y (t 12 11) V NOS 05 Benzene 560 G ks I131A 91 IP2A IP2B IP3A IP3B Toluene 46 TPH-g Total Petroleum Hydrocarbons as gasoline Benzene 150 m Toluene i 16 MW$ 11 MW1 Benzene 1980 7 760 850 595 266 2 930 Ethylbenzene 101 MTBE Methyl t-butyl ether Ethylbenzene 674 N cP (-11 78} Toluene 18,500 25 000 4 470 18 700 1 300 19 500 Xylenes 92 a m S { 12 03) Ethylbenzene 5 920 2 930 1 720 4 580 588 2 720 TPH g 1 090 Xylenes 1 390 y��-{ Xylenes 28 800 14 500 8 220 19 700 2 830 13 500 MTBE(8021) 123 TPH-g 7720 0TPH-g 250 000 154 000 46 300 162()()o 17 800 123 000 MTBE(8260) <05 Notes MTBE(8260) 220 Z�cn MTBE(8021) 360 100 25 0 370 160 9001 Analytical results In micrograms per liter(ug/L) S Ethanol <100 MTBE{8260} 1 <50 <50 1 <25 <50 1 <10 <50 � Wells gauged on 1 December 2004 SITE PLAN SHOWING GROUNDWATER ELEVATIONS AND ANALYTICAL RESULTS FIGURE FORMER EXXON RS 7-3942 Ab ETIC 4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA ENGINEEKINV 1-3 DECEMBER 2004 4 l