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Benzene 5100 1 k MW11 . NToluene 4,260 (not located to scale) Groundwater Ethylbenzene 1260 {NM} ' Xylenes 3 620 Benzene 230 Benzene 190 y Flow Direction TPH-g39 700 0 25 50 Gradient = D 005 Benzene 153 Toluene 485 Toluene 2 8 MTBE(8260) <0 5 Toluene v1 9 Ethylbenzene 2 990 Ethylbenzene 2 2 I! Ethanol <100 Ethylbenzene 20 9 Xylenes 11,100 Xylenes 86 Scale(feet) Xylenes 64 4 TPH-g 45 000 TPH-g 1 320 ' TPH-g 4 OGD MTBE(8260) <05 MTBE(8021) 148 Benzene 188 MTBE(8021) 41 4 Ethanol <100 MTBE(8260) <05 (-1 46) Toluene 83 MTBE(8260) <0 5 M 13 Ethylbenzene 36 5 ' Xylenes 221 TPH-g 1530 MTBE(8021) 25 8 MTBE(8260) <0 5 Benzene 946 ' Toluene 2 830 Benzene 941 Ethylbenzene 788 U Toluene 292 Benzene <05 Benzene 260 Xylenes 3 310 GNP�EC 4 Eth Ibenzene 112 Toluene <0 5 TPH-g20 000 1 y Ethylbenzene <0 5 psp Xylenes 134 < Toluene 9 660 MTBE(8260) <05 R TPN 1 470 Xylenes D 5 ' Ethylbenzene 1,780 Ethanol <100 N� MTBE(6021) 322 ( PH-) <50 5 Xylenes 7950 MTBE 8260 TPH-g 47 900 MPR1E MTBE(8260) I <Q 5 Ethanol <10 MTBE(8021) 156 ROrj� MTBE(8260) <25 pR } ' 01A MW10 MW12 ' Benzene 150 Fess1C, {NM) Toluene <0 5 pR p14p1N (-1367) I ' Ethylbenzene <0 5 I MW9 xylenes <D 5 RW4 (-1207) (TPH-g 133 (-1366) Benzene 5 020 MTBE(8260) <0 5 Toluene 8,790 '• Ethanol <100 (-1344) Ethylbenzene 1 240 (-13 03) Xylenes 6 890 E�-EVENPSV1 UVB-MW2 (shallow) TPH-g 63 300 7- Benzene 1 40 (-12 57) �- UVB MTBE(8021) <50 ' Toluene <0 5 Ethylbenzene <0 5 RW2 - (-1280) U1W6(Dry) Benzene 1,290 � VB-MW1 (deep) (-13 10) i M Xylenes <0 5 FoRM��y �� ' SW2 Toluene 16 2 TPH-g 331 tpy3K (-1274) y � {�PSV2 Ethylbenzene 548 Benzene 6270 LEGEND ' MTBE(8260) 855 -� V1 �L Toluene 14400 Ethanol <100 � ' NM ' Xylenes 237 I NM ( ) ' TPH-g 2,570 Ethylbenzene 2740 ; MW4 { } 2A/B Xylenes 10,100 GROUNDWATER MONITORING WELL MTBE(8260) • PIEZOMETER Z (-1234 tiIP3A/ (-12 57} V2 Ethanol <100 5 TPH-g79,700 • P1 SWI 12 78 MTBE(8021) 128 ' (NM) ( )RW1 ' MTBE(8260) <25 ♦ VAPOR EXTRACTION WELL _ , (MW 9) 4�V4_ I NM) -� 'k (-12 tZ0)\ -0 (-1243) ( MW (-1264) RECOVERY WELL Benzene 13 7 m ' ( ) Benzene 110 ' �7 IW1 (-12 22} �, �ti(-12 61} �� MW Toluene 978 � O PERMANENT SOIL VAPOR MONITORING WELL Toluene <0 5 k Benzene <0 5 Ethylbenzene 272 Toluene <05 y 3 AIR SPARGING WELL Ethylbenzene 3 9 I • NMS �5 �y FORME N ti 1 Ethylbenzene <0 5 Xylenes 345 Xylenes o6 Z (NM� 'S4 xy ti1 S�Aj%G ��- Xylenes <05 50 MTBE 021) 4,060 INJECTION INJECTION WELL TPH-g1110 ) � ' MTBE(8260) <0 5 � gu14 _ 11� — TPH-g << Ethanol <100 YG �, MW7�fFoRM P +ti Fo R MTBE(8021) <0 5 MTBE(8260) <0 5 (-14 46) Groundwater Elevation (feet) ( 12 11) P�NpS '_—'� �fSEp"K (NM) Not Measured G 1g1A Benzene 560' TPH-g Total Petroleum Hydrocarbons as gasoline Benzene 150 C� IMA IP1B �P2A IP2B IP3A IP3B Toluene 46 Toluene 196 MW$ Benzene 1 960 7,760 850 595 266 2 930 Ethylbenzene 101 MTBE Methyl t-butyl ether Ethylbenzene 674 N u' tP (-1178) ` MW 1 Toluene 18,900 25,000 4 470 18,700 1 300 19,500 Xylenes 92 Xylenes 1 390 -{ (�12 03) Ethylbenzene 5,920 2,930 720 4,580 588 2 720 TPH-g 1 090 TPH-g 7,720 �� f Xylenes 28,800 14 500 8,220 19,700 2 830 13,500 MTBE(8021) 12 3 8 MTBE(8260) 220 (y�tn TPH-g 250 000 154 000 46 300 162,000 17 800 123 000 MTBE(8260) <0 5 Notes ` Ethanol <100 MTBE(8021) 360 100 250 370 160 90 0 Analytical results in micrograms per liter(ug/L) IZ- MTBE(8260) <50 <50 <25 <5D <1 D <50 I Wells gauged on 1 December 2004 s SITE PLAN SHOWING GROUNDWATER ELEVATIONS AND ANALYTICAL RESULTS i FIGURE ETICFORMER EXXON RS 7-3942 4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA ENGINEERINV I 1-3 DECEMBER 2004 1