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-LEGEND <br /> Shallow groundwater monitoring well Groundwater eenzene <0.60 <br /> GW Flow Direction (Shallow) Toluene <0•60 <br /> Deep groundwater monitoring well EthylbenZ� <0.507,\ <br /> Mi <br /> Soil vapor monitoring well Gradient = 0.004 TPH-g <50 <br /> i�asE DIAGRAM N <br /> TPH-d <50 (SHALLOW) <br /> Groundwater extraction well <br /> MT <br /> (8260) <o.s0 <br /> Soil vapor extraction well 1,2-DCA 0.10 SHED <br /> Cone penetrometer boring °'A'q ( �1 <br /> 0 Sampling location during the 1994 tank removal <br /> p Sampling location during the 1999 preliminary site investigation T f, W E t7 <br /> (-21.68) Groundwater elevation(feet) ` o <br /> Fence (.2028) <br /> MW6 <br /> TPH-g Total Petroleum Hydrocarbons as gasoline PoarnER F <br /> Benzene 0,38 Benzene <0.50 P �—. USE t °4S <br /> TPH-d Total Petroleum Hydrocarbons as diesel Toluene 5.5 Toluene <0.50 ,sEaa{o T`"X <br /> y tertiary y Ethyibenzene 0.52 Ethylbenzene <0.50 <br /> MTBE : <br /> Methyl tertia butyl ether Xylenes 3.2 xylenes 0.10 Z CPT6 1 <br /> TPH-g 50 TPH-g <50 O ~ <br /> TBA Tertiary butyl alcohol TPH-d <50 TPHd <50 �3FORMER` <br /> MTBE(82'00) <0.50 MTBE(8260) <0.50 OPT6A '� —~' US7s x Current Gradient <br /> 1,2-DCA 1,2-Dichloroethane TBA 7.4 S- ~i • Historical Gradient S <br /> • Not used to determine gradient 1,2 DCA 5.8 v1 f <br /> X Benzene 6,700 <br /> NOTES: Toluene <100 <br /> Concentrations in micrograms per lifer u L}. vy �\ Eu,ylbenzene 25 <br /> \ <br /> Oxygenates and additives, other than A4 , shown only where detected. Xy3enes 32TPH-9 10,000 CPT5 <br /> h \\ �F TPH-d 2,900 <br /> rMc CPT2 V MTBE(8250) 480 <br /> �� � <br /> BUILDING ` <br /> VK' <br /> M YY1 / FORMER(ao3a) FORA! R MFENSER V10 m <br /> / STATIONBU RING/ <br /> Benzene 1.9 <br /> Toluene <0.50 / / � MW2 <br /> Ethylbe1.9 CPT4 <br /> EXTENT OF � (-20.62) <br /> nzene / ,r" <br /> Xylenes 38FORSf.ER EXCAVATION <br /> TPH-g 280 280 \ / Vv CPT3 <br /> TPH-d <50 \ / {N~ ® Benzene 43,000 <br /> MTBE{8260} <0.50 \ Toluene 73,000 <br /> 1,2-DCA 1.7 Uers I Ethylbenzene 3,600 <br /> (-2023) (-205spr Xylenes 21,000 <br /> MW3 ItW 20 28 s w1 0 <br /> D4 TPH-9 150, <br /> Benzene 5,100 wq �s• 1r`� TPH-d 670 <br /> Benzene <br /> en_ <0.60 <br /> TOEuene 54,000 w11 { = MTBE(8260) e1 000 ene <0.50 <br /> Eth benzene 4,000 V_ Ethybenzene <0.50 <br /> BUIL ®CPT1 FORMER Xylenes <0.50 <br /> Xylenes 22,000 C SPEr SEk <br /> TPH-g 110,000 !'Mw) TPH-g <50 <br /> TPH-d 580 1 V7 MW TPH-d c50 <br /> MTBE(8260) <1,000 V8 MTBE(8260) <0.50 <br /> Benzene 19,000 <br /> Totuene 56,000 <br /> Ethylbenzene 3,000 <br /> Benzene 560 Xylenes 17,000 <br /> T01Uem 64 TPH g 130,000 <br /> Xylenlbeene 120 TPH-d 010 <br /> TP,ges 140 MTBE(8260) <1.000 <br /> TPH-d120 <br /> MTBE(8260) <10 <br /> M N <br /> 0 30 <br /> a <br /> Scale(feet) <br /> d <br /> a SITE MAP SHOWING GROUNDWATER ELEVATIONS AND ANALYTICAL RESULTS FOR SHALLOW ZONE FIGURE: <br /> +> <br /> ETlRC 75 EAST FORMER MOBIL STATION 99CAS <br /> ALPINE AVENUE, STOCKTON, CALIFORNIA <br /> 9 FEBRUARY 2011 <br />