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{ <br /> 15 October 2003 <br /> -AGE-NC Project No. 03-1079` <br /> Page 5 of 5 ` <br /> 4.4. BORING ABANDONMENT <br /> All probe borings will be permanently sealed to prevent vertical migration of potential contaminants. <br /> Soil borings shall be abandoned by backfilling with-portland cement utilizing a tremie pipe from the - <br /> total depth to surface grade. <br /> 5.0 REFERENCES <br /> California Division of Mines and-Geology, 1981. Regional--Geologic Map Series, Sacramento <br /> Quadrangle. <br /> Olmsted, F.H., and G.H. Davis-, 1961,Geologic Features and Ground Water Storage Capacity of <br /> the Sacramento Valley, California,U.S.Geological Survey Water Supply Paper 1497,241p. <br /> Advanced GeoEnvironmental,Inc. <br />