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r <br /> r <br /> SCOPE OF WORK <br /> SUBSURFACE SITE ASSESSHEHT <br /> PURPOSE <br /> The purpose of work as outlined is to provide a subsurface <br /> assessment of the presence of petroleum hydrocarbon contamination <br /> in the soil and/or groundwater at the Thrifty Oil Co. ( 'Thrifty• ) <br /> properties referenced on the attached lists. <br /> SOIL BORINGS <br /> Four soil borings will be installed in the area adjacent to the <br /> underground gasoline/diesel storage tanks. The location of these <br /> borings shall be 'subject to Thrifty's approval. the borings will <br /> be a minimum of 2• in diameter and to a depth of twenty feet or <br /> groundwater, whichever first occurs. <br /> Borings will be installed with a truck mounted hollow stem auger <br /> drill rig equipped with a continuous core sampler. <br /> Soil cuttings shall be placed in 55 gallon drums pending results <br /> of laboratory analysis. If the soil is free of contamination, <br /> the disposition shall be the responsibility of the contractor. <br /> If contamination exists, disposition shall be Thrifty's <br /> responsibility. <br /> The borings shall be backfilled to a depth of five feet with a <br /> mixture of bentonite and clean native soil. The remaining five <br />