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4 <br /> T <br /> F Laurie Cotulla <br /> April 23, 1986 <br /> Page 3 <br /> C. Adjacent to and intersecting the tank pit backfill <br /> at the east end of the regular tank ( southern tank <br /> within pit ) . <br /> D. At the western end of the :pump island . <br /> 4. These shallow borings will be drilled and sealed with cement <br /> grout the same day unless it is decided to deepen the boring <br /> to permit the construction of a groundwater monitoring well. <br /> 5. Three deep soil borings will be drilled to define the <br /> vertical extent of soil contamination and permit the <br /> construction of groundwater monitoring wells, if necessary, <br /> to evaluate the impact on the shallow groundwater system. <br /> 6. The monitoring wells will be constructed of 2 or 4 inch <br /> machine' slotted PVC screen and casing installed within an 8 <br /> inch borehole (See Figure 2 ) . The screened interval will <br /> extend a minimum of 10 feet above the water table and a <br /> minimum of 20 feet below the water table (unless a competent <br /> aquitard is encountered less than 20 feet below the water <br /> table ) . Bentonite overlain by a cement grout will be used <br /> to seal the annular space above the screened interval. <br /> 7. Undisturbed soil samples will be collected from all borings <br /> at a minimum of five foot intervals. The soil sample <br /> collection and preservation shall be conducted in accordance <br /> with the attached Groundwater Technology' s Standard Operating <br /> Procedures SOP 14 and SOP 15. <br /> 'I I <br /> a <br />