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COMMERCIAL. I t <br /> I <br /> I � Z <br /> PARKING ! f <br /> II I I I - - - --- - - <br /> NO I o 20 40 <br /> ND ND T � I I <br /> I ww`1 ND ND , SCALE IN FEET <br /> I <br /> I I 0 LEGEND. <br /> 2375 E TRACY QPARKING TR <br /> JACK IN GROUND WATER MONITORING <br /> WELL <br /> ND THE BOX -�} <br /> D ND W ND <br /> RECOVERY WELL <br /> NO NO Z w 7ND <br /> ANW F_ —1 UNDERGROUND STORAGE <br /> NO J I a N TANK LOCATION <br /> ND NQ <br /> f YD — — NNO O ND u 2 , I Z I C= PUMP ISLAND <br /> ' � ■ STORM� ORM DRA NRMER P ISLAND <br /> 1300 <br /> — __1 NOT DETECTED AT OR ABOVE <br /> zl' aRvrMl s2�110 - (w) INDI { METHOD DETECTION UNITS <br /> I ~ CND~ —� N[} NO /i -3 Fp FREE PRODUCT <br /> 18" SANITARY— _ - d., J�rwc— NO NO NO ND r --- APPROXIMATE EXTENT OF <br /> SEVER Ira Na I / DISSOLVED—PHASE HYDROCARBONS <br /> *AWW-z Aww-4 7.1 <br /> I I Na N"V D GENERAL DIRECTION OF <br /> ND NO 46 3 4 I GROUND WATER GRADIENT <br /> ND NO � +NDND 3e58175' TPH—G <br /> NQ ND ' \ 8 T <br /> I <br /> It >KATER I <br /> TRACY BOULEVARD E X <br /> — — — — — — — — — — — — — — — I TPH—C = TOTAL PETROLEUM HYDROCARBONS <br /> Ir WAM AS GASOLINE CONCENTRATION (in ppb) <br /> — — — — — — — — — — — — — — — — B = BENZENE CONCENTRATION In ppb <br /> 21' slow DRAIN - - - - I T = TOLUENE CONCENTRATION Ch ppb <br /> I I , E - ETHYLBENZENE CONCENTRATION in ppb) <br /> t I X = XYLEM= CONCENTRATION (In ppbi <br /> 7500 iUw—s J Mw-8 3600 <br /> T165 � 75 24 FIGURE 8: <br /> COMMERCIAL I , �0 '20 DECEMBER 10 1991 <br /> c CHEVRON <br /> HYDROCARBON CONCENTRATIONS <br /> I EXXON �= I I � <br /> NOTES IN GROUND WATER SAMPLES <br /> 1 DUE TO GRAPHICAL RESTRAINTS THE POSITIONS OF FORMER MOBIL STATION 04—NP4 <br /> 134' MONITORING WELLS AMM-1 & AMW-3 ARE NOT SHOWN 2375 TRACY BOULEVARD <br /> CW TRUE LOCATION <br /> �W-1 2 GROUNDWATER POUNDING APPEARS TO CAUSE A LOCAL TRACY, CALIFORNIA <br /> GRADIENT REVERSAL A WATER BARRIER TO FREE PRODUCT <br /> 4,r MIGRATION iS A POSSIBLE REASON FOR THE LACK OF <br /> HIDROCARBONS IN 's WW-5 I ALTON GEOSCIENCE <br /> +NDNO <br /> i <br /> SOURCE. OP OIL. COMPANY Cf1Y OF TRACY IBES pEpy, 1 Pleasanton, Callforrlla <br /> PROJECT NO. 30-0140 <br /> 14.0-Al 1 4/16/92 <br /> I <br /> t - <br />