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N <br /> HAMMER LANE <br /> 0 15 30 <br /> —— —" SCALE IN FEET <br /> PLANTER <br /> PLANTER <br /> . 1 <br /> E 1 <br /> 1 <br /> MW-3 4 �C <br /> 270 rn <br /> 23 ND<0.5 PUMP ISLANDS P <br /> ND<0.5 ND<0..5 p <br /> 0 o MW-2 <br /> 2600 <br /> 460 13 1 m <br /> 77 81 <br /> 0 UNDERGROUND <br /> FF-fr STORAGE TANKS <br /> � l <br /> STATION BUILDING I <br /> I � <br /> 1 L - —MW-1 $ <br /> 160 <br /> 9.2 ND<0.5 <br /> MW-4 <br /> ND<0.5 0.6 <br /> 180 F - -1 <br /> 1 .1 N D<0.5 L -- -�� <br /> USED OIL TANK <br /> ND<0.5 0.9 <br /> -LEGEND <br /> 0 GROUNDWATER MONITORING WELL <br /> TPH-G CONCENTRATION OF CONSTITUENTS FIGURE 4 <br /> B T IN PARTS PER BILLION (PPB) <br /> E x CONCENTRATIONS OF PETROLEUM <br /> TPH-G TOTAL PETROLEUM HYDROCARBONS IN GROUNDWATER <br /> HYDROCARBONS AS GASOLINE <br /> B BENZENE APRIL 4, 1993 <br /> T TOLUENE BP OIL SERVICE STATION NO. 11193 R <br /> E ETHYLBENZENE 3202 WEST HAMMER ERNE <br /> x TOTAL XYLENES STOCKfON. CALIFORNIA <br /> ND NOT DETECTED ABOVE REPORTED PROJECT NO. 10-136 <br /> DETECTION LIMIT <br /> CALCULATED GROUNDWATER GRADIENT <br /> DIRECTION AND MAGNITUDE- AL.ISTo ENGINEERING GROUP W <br /> APRIL 26, 1993 A41M WALNUT CREEK, CALIFORNIA R <br /> s <br />