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' f:\projects\5137\rydemtk.rep <br /> ' On February 27, 1991, an excavator was used to deepen and widen the excavation. The <br /> excavation was expanded in a north-south direction and deepened to remove soil containing <br /> hydrocarbons found in samples collected during the February 15 excavation. The excavation <br /> extended beneath the buildirb a, much as possible without threatening the integrity of the <br /> structure. The excavation was deepened to approximately 18 feet. Three soil samples <br /> collected from the north wall of the excavation (pit wall 2, located beneath the building <br /> floor) contained nondetectable concentrations of Oil and Grease. One soil sample from <br /> ' the floor contained 71 mg/kg Oil and Grease, and the sample collected at a depth of 18 <br /> feet on the south wall contained 110 mg/kg Oil and Grease. Excavation activities were <br /> ' terminated at this point because the low concentrations of hydrocarbons remaining in the <br /> soil were known to be of limited vertical extent (to 18 feet at most) and lateral extent <br /> ' (based on analytical results of samples from boring C2). <br /> ' No ground water was found during boring and excavation activities. <br /> 3.5 Disposition of the Excavated Soil <br /> An estimated total of 250 cubic yards of soil was excavated and stockpiled onsite. The <br /> laboratory analyses obtained were used to profile the soil for disposal at Liquid Waste <br /> Management, Inc., a class 2 landfill facility located in McKittrick, California. The soil was <br /> hauled to and disposed at this facility on March 29, 1991. <br /> Soil disposal documentation is included in Appendix C. <br /> 7 <br />