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EXPLANATION: <br /> SHALLOW GROUNDWATER MONITOR WELL <br /> __ _ ♦ DEEPER GROUNDWATER MONITOR WELL <br /> ._ GROUNDWATER EXTRACTION WELL <br /> DESTROYED SVE PILOT TEST WELL <br /> L� DESTROYED SVE WELL <br /> M-1 <br /> ND<0.50 � DESTROYED GROUNDWATER MONITOR WELL <br /> FENCE <br /> x/ WHISKEY SLOUGH ROAD <br /> 2001 Source Area Investigations <br /> (A Hand Auger Borings-Shallow <br /> Direct Push Borings-Shallow <br /> I-1AND<0.50 Direct Push Borings-Deep <br /> VEW-6 �O ZZ) DISSOLVED TPHg ISOCONCENTRATION <br /> ^\ / CONTOUR LINE <br /> ND<0.50 DISSOLVED TPHg CONCENTRATION <br /> N-20 <br /> MILLIGRAMS PER LITER(mg/1) <br /> 9 + VEW-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 /> 4-24• AREA NS NOT SAMPLED <br />,')<0.50 <br /> 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 /> JUNE 1,2011 <br /> N-19 <br /> +ND<0.50 <br /> A" N <br /> <0.50— <br /> 0 100 200 <br /> APPROXIMATE SCALE IN FEET <br /> Figure 4 <br /> Dissolved-Phase TPHg <br /> Concentration Map, <br /> September 1, 2011 <br /> Holt Release Site <br /> CH2MHILL <br />