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I I1 ' 1 MW11 �• N GW Groundwater Benzene 3 400 (not located to scale) Toluene 12 009 Benzene 10 {NM} Flow Direction ' Ethylbenzene 3 000 0 25 50 Grodlen t = 0 006 Xylenes 13 000 Benzene <10 Toluene <5 0 + Toluene <10 Benzene 220 Ethylbenzene <5 0 1 TPH-g 69 000 Ethylbenzene 25 Toluene 270 Xylenes <5 0 l Scale(feet) MTBE(8260) <25 Xylenes 10 Ethylbenzene 1 800 TPH-g 1 100 ' TPH-g 3 300 Xylenes 6 400 MTBE(8021) <25 1 Benzene 34 MTBE 8021 <50 1 89 ( ) TPH-g 24 000 (- } Toluene 12 MTBE(8260) <2 5 MTBE(8260) <5 M W 13 Ethylbenzene 91 ' Xylenes 29 TPH-g 3100 MTBE(8021) <50 Benzene 1 800 Toluene 1600 Benzene 81 F- ; I Ethylbenzene 390 V Toluene 23 Benzene <0 5 ' Xylenes 1 400 Gip SP1. Ethylbenzene ss74 Toluene <0 5 Benzene 320 TPH-g 14 000 NGgP� Xylenes i 92 Ethylbenzene <0 5 MTBE 8260 <0 5 Toluene 14 000 ( ) c5 N� TPH-g 1 400 Xylenes g <50 ' Ethylbenzene 2,500 MTBE(8021) <12 Xylenes 13 000 !�^PR\� 1 MTBE(8260) <0 5 TPH-g 63 000 R�rj�M MTBE(8021) <1 200 �PC; A ' NN\- MW 12 MW10 Benzene 1 3RO Ec'pNG (-13 17) (NM) f Toluene <05 ??-0 �4 Benzene 12,000 ' Ethylbenzene <05 Toluene 30 000 MWg Xylenes <05 RW4 Ethylbenzene 4 400 11 75)- TPH-g 54 Xylenes 22,090 I ( } MTBE(8260) <05 V3 (-1310) TPH-g 140 000 (-1288) MTBE(8021) <2 500 E�-EVEN PSV1 UVB-MW2 (shallow) -- Benzene <2 5 (.-1216) �+ UVB Toluene <25 RW2 (-1241) UVB-MW1 (deep) (-1291) ' Ethylbenzene <2 5 R - 11 Benzene 1 400 � Xylenes <2 5 Fo�M�L SW2 66 (-11 57) TPH-g <250 pasK�'E (-12 33) '� Toluene 36 Benzene 6 500 MTBE(8260) 90 V1 PSV2 Ethylbenzene 94 Toluene 17 000 LEGEND ' �' NM (NM) Xylenes 45 6 300 Ethylbenzene 3 500 z (-1194) (NM) 3'x_12 16 1 MTBE(8260) <5 xylenes 16,000 I GROUNDWATER MONITORING WELL V2 TPH-g 93,000 1 • PIEZOMETER 0 • P1 ti SWI 12 33 MTBE(8921) <1 209 ' 1 (NM) MW2 1-A ( )RW1 ♦ VAPOR EXTRACTION WELL _ (-1178) V4_ ' (-12 33) -t3 (-12 05) (NM)MW3 �� RECOVERY WELL Benzene 8 6 � � 5 (-12 03)" Benzene 71 Toluene <25 �1 IW1 (-11 82} r� ��(-12 12) ti MW5 Toluene 49 O PERMANENT SOIL VAPOR MONITORING WELL ' Ethylbenzene Benzene <0 5 1, Ethylbenzene 170 y <25 N � Toluene <05 + AIR SPARGING WELL Xylenes <2 5 Benzene <0 5 = • P2�1� ti ti RMER Xylenes 170 TPH-g 660 Toluene <0 5 Z (NM� ' �y 5 -�\O G x5�. Ethylbenzene c0 5 TPH Ethylbenzene <0 5 {i 'S '�J 'y VP' wI 1 Xylenes c0 5 1) 3 300 INJECTION WELL MTBE(8260) <05 Xylenes <05 1 ti gL1 � ��ti-- TPH-g <50 MTBE(8021} c50 f= MTBE(8021) <2 5 t, INJECTION POINT ' TPH-g <50 G ', MW7�lFoRMpR �� } '� FO I MTBE(802 1) <2 5 m 11 6g ?`3 5 '�_—''�� SED' (-9 93) Groundwater Elevation (feet) MTBE(8260) <0 5 G ,1 ) �g1ANo Ll tlt�K Benzene 11% (NM} Not Measured Benzene <50 Kt1 INA 1P1B IP2A IP2B IP3A IP3B Toluene 55 ' <50 MW8 MW1 Benzene 860 4 300 200 <250 870 2 800 Ethylbenzene 10 Not Used to Calculate Gradient Toluene Benzene <0 5 Toluene 7 000 20,000 2 800 11 900 3 300 24,000 Xylenes 13 Ethylbenzene 490 T 0 o (-1134) Toluene <05 (�11 61) Ethylbenzene 2,600 2,200 1200 2,700 1 400 2 700 TPH-g 1 300 TPH-g Total Petroleum Hydrocarbons as gasoline Xylenes 800 y��-` Ethylbenzene <0 5 Xylenes 14,000 12,000 4200 14 000 5,600 15 000 MTBE(8021) 17 MTBE Methyl t-butyl ether ' TPH-g 5 000 g MTBE(8260) 1 1 OZ t` XTPH <5O 5 1 TPH-g 42 000 59 900 17 000 47 090 22 000 71 000 MTBE(8260) <05 MTBE(8021) <25 l� MTBE(8021) <620 <1 200 <250 <1 200 <250 <2 500 Notes VMTBE(8260) 1 <250 <100 <25 <250 <25 <1E-j Analytical results In micrograms per liter(ug/L) ' SITE PLAN SHOWING GROUNDWATER ELEVATIONS AND ANALYTICAL RESULTS FIGURE ♦ ETI FORMER EXXON RS 7-3942 ENGINEERING 4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA ' 12 AND 13 OCTOBER 2005