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t,. <br /> ,a <br /> ZIP IM <br /> "4 <br /> • Collection of additional samples for soil density <br /> measurements. <br /> Borings were installed with a mobile drill rig, using hollow-stem <br /> augers in the locations shown in Figure 1-1. The location for Boring <br /> B-11 was chosen in order to collect a sample where high <br /> concentrations of Total Petroleum Hydrocarbons (TPH) had <br /> previously been detected in August 1989, and in order to determine <br /> the deepest occurrence of the product, in the soil. Locations for <br /> Borings B-12 and B-13 were chosen to determine the lateral extent of <br /> product-affected soil beyond Borings B-7 and B-10. <br /> r <br /> 1-2 <br />