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07 February 2006 <br /> AGE-NC Project No. 97-0360 <br /> Page 7 of 7 <br /> 4.3. 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 from the total depth to surface <br /> grade. <br /> 5.0 REFERENCES <br /> California Division of Mines and Geology, 1981. Regional Geologic Mup Series, Sacramento <br /> Quadrangle. <br /> OImsted,F.H.,and G.H. Davis, 1961,Geologic Features and Groundwater Storage Capacity gflhe <br /> Sacramento Talley, California. U.S. Geological Survey Water Supply Paper 1497. 241 p. <br /> Advanced GeoEnvironmental, Inc. (AGE) Excavation and Sampling Report 10 August 1998, <br /> 14210 West State Route Four, Stockton, California <br /> Advanced GeoEnvironmental,Inc. <br />