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EXPLANATION: <br /> 1 - SHALLOW GROUNDWATER MONITOR WELL <br /> DEEPER GROUNDWATER MONITOR WELL <br /> GROUNDWATER EXTRACTION WELL <br /> �- DESTROYED SVE PILOT TEST WELL <br /> DESTROYED SVE WELL <br /> Y M-1 + DESTROYED GROUNDWATER MONITOR WELL <br /> NS <br /> w� x x FENCE <br /> /x wH)s�y SLOUGH ROAD <br /> 2001 Source Area Investigations <br /> cA Hand Auger Borings-Shallow <br /> �) Direct Push Borings-Shallow <br /> 1-I0ND<0.50 4 Direct Push Borings-Deep <br /> ^VEW- / 'OpOi DISSOLVED <br /> TPHg ISOCONCENTRATION <br /> CONTOUR DISSOLVED TPHg CONCENTRATION <br /> NO<d.5d MILLIGRAMS PER LITER(mg/1) <br /> �N-20 <br /> -g VEVV-10 ND<0.50 TPHg TOTAL PETROLEUM HYDROCARBONS <br /> + PURGEABLE-GASOLINE RANGE ORGANICS(C4-C13) <br /> FORMER ND NOT DETECTED AT OR ABOVE THE <br /> SOIL VAPOR LABORATORY REPORTING LIMIT <br /> TREATMENT <br /> AREA NS NOT SAMPLED <br /> N-24• <br /> D<0.50 NOTE: TPHg CONTOUR LINES <br /> INTERPRETED WITH AID FROM DATA <br /> FROM THE FINAL SITE <br /> CHARACTERIZATION REPORT <br /> (CH2MHILL,2002). <br /> NOT USED IN CONTOURING,DEEPER WELL <br /> NOT USED IN CONTOURING, <br /> AGRICULTURAL FIELD SHALLOW WELL <br /> "' SAMPLE COLLECTED ON <br /> MARCH 21,2011 <br /> N-19 <br /> �ND<0.50 <br /> » N <br /> :0.50' <br /> o w 200 <br /> APPROXIMATE SCALE IN FEET <br /> Figure 4 <br /> Dissolved-Phase TPHg <br /> Concentration Map, <br /> March 2, 2011 <br /> Holt Release Site <br /> CH2MHILL <br />