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I <br /> ARCO AM/PM <br /> SERVICE STATION <br /> '4 I <br /> N <br /> PRIVATE ROAD <br /> 0 30 60 <br /> SCALE IN FEET ' <br /> MW-4 MW-3 LEGEND <br /> 74 <br /> ' ND<0.5 ND<O.5 2.6 ND<0.5 � �$ GROUNDWATER MONITORING WELL � <br /> ND<0.5 1 .3 ND<0.5 ND<0.5 I TPH-G <br /> NOT MEASURED SERVICE NOT MEASURED B T CONCENTRATION IL CONSTITUENTS <br /> � W �; IN PARTS PER BILLION, EXCEPT <br /> $ STATION Z DISSOLVED OXYGEN, WHICH IS IN <br /> F BUILDING Z EDOX PARTS PER MILLION <br /> I I a MW6 7 <br /> TOTAL PETROLEUM <br /> ' L J DISPENSER 1 .0 ND<0.5 TPH-G HYDROCARBONS AS GASOLINE <br /> ISLANDS Ld ND<0.51 2.0 <br /> 4.7 B BENZENE <br /> UNDERGROUND QT TOLUENE <br /> USED OIL TANK MW-5 = E ETHYLBENZENE <br /> MW-2 <br /> 1 B000 �34 170 1 .0 a H X TOTAL XYLENES ' <br /> -�4 700 120 <br /> 610 900 ND<0.5Ig 8.1 W DO DISSOLVED OXYGEN <br /> 1 o ND NOT DETECTED ABOVE REPORTED <br /> NOT MEASURED <br /> 1 DETECTION LIMIT <br /> 4 f CALCULATED GROUNDWATER <br /> GRADIENT DIRECTION AND <br /> MW63 1 y MAGNITUDE IN FOOT PER FOOT <br /> ND<0.5 ND<0.5 UNDERGROUND <br /> 27 <br /> ' ND<0.5 ND<0.5 FUEL TANKS <br /> NOT MEASURED <br /> PLANER <br /> DRIVEWAY <br /> 1 1 <br /> f <br /> DRIVEWAY � � <br /> ' TRANSFORMER <br /> FIGURE 5 <br /> CONCENTRATIONS OF PETROLEUM <br /> ' HYDROCARBONS IN GROUNDWATER <br /> APRIL 20 AND 25, 1994 <br /> I <br /> BP OIL SERVICE STATION NO. 11193 R <br /> 3202 WEST HAMMER LANE <br /> MW--6 STOCKTON, CALIFORNIA <br /> ' 53 PROJECT NO. 10-136 <br /> } ND<0.5 ND<0.5 <br /> J 0.6 2.4 <br /> 2.0 ALISTO ENGINEERING GROUP <br /> WALNUT CREEK. CALIFORNIA <br /> s <br /> i; I <br />