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17 June 2003 <br /> AGE-NC Project No. 03-1043 <br /> Page 6 of 6 <br /> 4.5. BORING ABANDONMENT <br /> The probe borings will be permanently sealed to prevent vertical migration of potential <br /> contaminants. Soil borings shall be abandoned by backfilling with portland cement from the total <br /> 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 Groundwater Storage Capacity ofthe <br /> Sacramento Valley, California, U.S. Geological Survey Water Supply Paper 1497,241p. <br /> Advanced GeoEnvironmental, Inc. (AGE) Excavation and Sampling Report 10 August 1998, <br /> 14210 West State Route Four, Stockton, California. <br />