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FIGURE 4 <br /> Impacted Area #2 <br /> Previous Sampling Locations and Concentrations <br /> I , <br /> 804 <br /> I <br /> I _ <br /> 871 (2') <br /> 8 333(2') <br /> 192(2') <br /> � l <br /> I � <br /> � W <br /> i2 <br /> BUILDING zz ° <br /> } <br /> 10047 10.2(r> Uj <br /> <10(2.5') #10 a <br /> STAGING <br /> - AREA <br /> 274(2') <br /> _ 33(2) <br /> i <br /> ' i f <br /> I I <br /> I � I <br /> I � I <br /> C <br /> O <br /> U <br /> I <br /> Fire Hydrant <br /> I I <br /> � I <br /> � I <br /> � I <br /> � I <br /> LEGEND <br /> I <br /> • PREVIOUS SAMPLING LOCATION <br /> t <br /> ® IMPACTED AREA <br /> I <br /> I <br /> HYDRAULIC OIL CONC.(Sampling Depth) <br /> I <br /> 871 (2') MARCH 1997 <br /> 333(2') AUGUST 1997 <br /> Scale 1"=40' Asphalt Crossing 221 (2') JUNE 1998 <br /> Note.,AN Concentrations to mg/kg. <br /> CADTTROJECTM10156TIGURE2.MG <br /> ©TETRA TECH, INC. <br />