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Air I ' Benzene 3 150 M W 11 Toluene 9 710 (not located to scale) I` N GW Groundwater Ethylbenzene 2 860 1 (NM) Xylenes 10 800 1 ' Flow Direction Benzene 245 Benzene 11 4 0 25 50TPH-g 60 800 Benzene 474 Toluene 355 Toluene 1 4 Grodlen f = 0 005 MTBE(8260) <0 5 Toluene 172 Ethylbenzene 2 610 Ethylbenzene 1 2 Ethanol <100 Ethylbenzene 109 Xylenes 9 240 Xylenes 41 Scale(feet) Xylenes 238 TPH-g 33 900 TPH-g 1 040 TPH-g 3 500 MTBE(8260) <0 5 MTBE(8021) 115 Benzene 151 MTBE(8021) 274 Ethanol <100 MTBE(8260) <1 (-12.38) Toluene 4 0 MTBE(8260) <1 MW 13 Ethylbenzene 224 Xylenes 8 6 ' TPH-g 1,190 MTBE(8021) 168 MTBE(8260) <1 Benzene 1990 Toluene 2180 Benzene 00 ' Ethylbenzene 548 239 Benzene <0 5 Benzene 370 Xylenes 17 300 ��CCP EthylbeToluene zene 192 8 Ethylbenzene <05 Toluene 16 800 MTBE(8260) <0 5 Np�P Xylenes Xylenes <05 Ethylbenzene1 00 3 930 TPH-g Ethanol <10D C1E' TPH-g <50 Xylenes 16,700 MTBE(8021) 9 6 MTBE(8260) <05 TPH-g 88,000 �� MTBE(8260) , <1 rMP.� Ethanol <100 MTBE(8021) 136 ROCjG MTBE(8260) <1 �P�CpFt MW10 MW12 Benzene 080 E551 G (NM) Toluene <0 5 PR j4p�N (-11 36) Benzene 11 400 ' Ethylbenzene <0 5 Toluene 26 800 MW9 Xylenes <0 5 RW4 Ethylbenzene 4 010 (-1033) TPH-g 657 Xylenes 21 600 MTBE(8260) <0 5 V3 (-11 62) TPH-g 143 000 Benzene <0 5 Ethanol <100 (-1144) MTBE(8021) 180 Toluene <0 5 (-11 14) 1 MTBE(8260) <20D Ethylbenzene <0 5 7 E�-Ev�N Benzene 1 20 PSV1 UVB-MW2 (shallow) Xylenes TPH g <5D 5 Toluene <0 5 (-10 73) UVB MTB (8021) <0 5 Ethylbenzene <0 5 RW2 (-1093)#.'SVB-MW1 (deep) (A 1 22) +~� - 11- Benzene 1390 Xylenes <0 5 roR� �� SW2 � f�W$ (-11 07 TPH-g 349 1Pp►K (-10 89) ��..yy,PSV2 Toluene 178 MTBE 6260 108 V 1 "1 Ethylbenzene 572 Benzene 7 160 ' ( ) - Toluene 15 50D LEGEND Ethanol <100 NM Xylenes 22 2 MW4 (NM) �(p ) '� TPH-g 4 870 Ethylbenzene 2 850 GROUNDWATER MONITORING WELL Z (-1048) \IP2A/B 3�8-10 77 1 MTBE(8260) <05 Xylenes 11,1DD V2 Ethanol <100 TPH-g 78,600 • PIEZOMETER • P1 ' SWI I 10 88 MTBE(8021) 671= (NM) (- )RW1 MTBE(8260) <1 I ♦ VAPOR EXTRACTION WELL -d 1 (-1061 (NM)-) 4�( -10)70 1 RECOVERY WELL ti ( ) Benzene 80 9 Benzene 123 1 fW1 (-10 35) �, titi (-10 73)* �� MW5 Toluene 544 O PERMANENT SOIL VAPOR MONITORING WELL ' Toluene 12 \ Benzene <0 5 N Toluene <05 Ethylbenzene 195 -+ AIR SPARGING WELL Ethylbenzene 3 8 Z • P2�� t MSR Xylenes 195 Xylenes 13 Z 1 (NM� ti Fp ,j\00 1 ti 1 Ethylbenzene <0 5 TPH TPH-g 888 G� t ti s ti S.V G ti Xylenes <0 5 g 3 39D INJECTION WELL MTBE TPH-g <0 5 I �� `� k V14pIN 1,� TPH g <50 MTBE(8021) 287 Y ` MER \� 6 R MTBE(8021) <0 5 MTBE(8260) <1 INJECTION POINT ' Ethanol R _ <1oD - (SMO 3)`F ?\.30?ps `t� usEp-K (-993) Groundwater Elevation (feet) G �51A Benzene 7 50 (NM) Not Measured Benzene 215 0 IP1A INN IP2A IP2B 1P3A IP3B Toluene 25 ' Toluene 806 MW81 MW1 Benzene 1 400 5,380 660 420 760 2200 Ethylbenzene 64 Not Used to Calculate Gradient Toluene 15 000 18 300 1,120 12 000 900 18,900 Xylenes 4 7 Ethylbenzene 554 S (-�93) 10 15 !benzene 4 730 2,680 1 34D 2 820 2 18fl 3 000 TPH-g 685 TPH-g Total Petroleum Hydrocarbons as gasoline Xylenes 1,140 A V m (� ) Ethylbenzene TPH g 5570 �� r Xylenes 26 200 14 500 6,680 13 900 9,140 15,700 MTBE(8021) 7 9 MTBE Methyl t-butyl ether ' MTBE(8260) 210 OZ�m 1 TPH-g 60 800 102 00027,500 76 200 45 300 101,000 MTBE(8260) <1 Ethanol <100 1� MTBE(8021) <50 42 0 <5 54 0 <5D 71 0 Notes _ MTBE(8260) - <10 - <10 - <10 Analytical results to micrograms per liter(ug/L) t � ' SITE PLAN SHOWING GROUNDWATER ELEVATIONS AND ANALYTICAL RESULTS FIGURE a 40)111' 9NU1NE!RC1Nrj FORMER EXXON RS 7-3942 4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA 1 ' 22 AND 23 JUNE 2005