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15 July 1998 <br /> AGE-NC Project No. 98-0450 <br /> Page 2 of 5 <br /> grade (bsg) (soil samples TK1, 2 mid 3 at 15 feet) and the western edges of the dispenser islands at <br /> a depth of 5 feet bsg (samples PL3, PL4 and PL5 at 5 feet). <br /> Based on the concentrations of petroleum hydrocarbons quantified during the UST system removal. <br /> a site assessment to determine the lateral extent and vertical extent of the hydrocarbon-impacted soil <br /> and ground water will be required by the PHS-EHD. <br /> 3.0. SCOPE OF WORK <br /> The scope of the work includes the advancement of a minimum of nine soil borings for the collection <br /> of soil samples and well construction. The phases of work includes the following: <br /> I. The advancement of three soil borings in the former dispenser area to a vertical depth of 30 <br /> feet bsg, to delineate the vertical extent of soil samples PL3, PL4 and PL5 from the UST <br /> removal. If hydrocarbon-impacted soil is encountered at a 30 feet bsg, the soil borings will <br /> be advanced to 50 feet or 70 feet bsg, based on observed and measured impacted soils. <br /> 2. The advancement of three soil borings in the former UST area to a minimum depth of 30 feet <br /> bsg and if necessary to be continued to depths until soil contamination is no longer observed <br /> or measured with filed screening devices. <br /> 3. Establish two slant-boring at 30 degree angles from vertical under the property north of 501 <br /> West Lodi Avenue. The soil borings should be advanced to a minimum of 50 feet vertical <br /> bsg. <br /> 4. One additional soil boring will be established to a depth of 65 feet bsg on the eastern edge <br /> of the property for the installation of a ground water monitoring well. <br /> 5. The borings will be established for the collected of soil samples and based on observed <br /> extent of impacted soil two selected soil boring, likely in the UST area and dispenser areas, <br /> would be completed as soil v r extraction wells for future feasibility testing. <br /> 3.1. DRILLING AND SOIL SAMPLING <br /> The soil borings to be completed will be advanced utilizing a truck-mounted, hollow-stem drill rig <br /> equipped with 8.25-inch hollow-stem augers. One soil boring will be sampled continuously using <br /> a soil core barrel and samples will be collected manually from the core at lithologically significant <br /> layers or heavily hydrocarbon-impacted soils. The other soil borings will be sampled at five-foot <br /> intervals using a California split-spoon sampler and brass sleeves. The sampler will be driven by <br /> dropping a 140-pound weight from a height of 30 inches. The number of blows required to drive <br /> Advanced CeoEnN ironmtntal.Inc. <br />