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kI <br /> ry <br /> ARCO AM/PM <br /> SERVICE STATION h <br /> l � <br /> PRIVATE ROAD <br /> 0 30 60 <br /> SCALE IN FEET <br /> LEGEND <br /> MW-4 MW-3 <br /> ND<50 ND<50 $ GROUNDWATER MONITORING WELL <br /> ND<0.5 ND<1.0 ND<0.5 ND<1.0 <br /> ND<1.0 ND<1.0 SERVICE ND<1.0 ND<1.0 TPH-G <br /> ND<10 srAT€oN $49 s T CONCENTRATION OF CONSTITUENTS <br /> z W � IN MICROGRAMS PER LITER <br /> r BU€LDING Z MTBE <br /> I 1 l TPH-G T�DROCARBONSAL UAS GASOLINE <br /> L J DISPENSER f B BENZENE <br /> ISLANDS W D<50 <br /> p.p02 ND<0.5ND<1.0 I T TOLUENE <br /> UNDERGROUND m ND<1.0 ND<1.0 <br /> USED OIL TANK Q ND<10 I E ETHYLBENZENE <br /> _ X TOTAL XYLENES <br /> �0ND< 5o a MTBE METHYL TERT BUTYL ETHER <br /> M15 2 ND<D.5 ND<1.o w w ! ND NOT DETECTED ABOVE REPORTED <br /> 90 ND<5.0 <br /> I ND]<5 ND<1.o � DETECTION LIMIT <br /> 4 <br /> 50<5.0ND<5.DND<10 <br /> 17000 o CALCULATED GROUNDWATER <br /> f 4 I Q.002 GRADIENT DIRECTION AND <br /> l MAGNITUDE IN FOOT PER FOOT <br /> MW-1 L- — -� <br /> ND<50 <br /> ND<0.5 IND<1.0 UNDERGROUND <br /> ND<1.0 1 ND<1.0 FUEL TANKS <br /> 14 <br /> PLANTER <br /> DRIVEWAY <br /> ORNEWA'y <br /> TRANSFORMER <br /> FIGURE 3 <br /> CONCENTRATIONS OF PETROLEUM <br /> _ b <br /> HYDROCARBONS IN GROUNDWATER <br /> L = JANUARY 7, 1998 <br /> BP OIL SERVICE STATION NO. 11193 <br /> MW--6 f 3202 WEST HAMMER LANE <br /> ND<50 STOCKTON� CALIFORNIA <br /> ND<0.5 ND<1.0 A <br /> ND<1.017ND<1.0 PROJECT NO. 10-136 <br /> l4 I <br /> AUSTO ENGINEERING GROUP W <br /> WALNUT CREEK, CALIFORNIA <br /> P <br /> I <br />