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30 August 2005 <br /> AGE-NC Project No. 05-1329 <br /> Page 6 of 6 <br /> 4.5. 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 Map Series, Sacramento <br /> Quadrangle. <br /> Olmsted,F.H.,and G.H.Davis, 1961,Geologic Features and Groundwater Storage Capacity of the <br /> Sacramento Valley, California, U.S. Geological Survey Water Supply Paper 1497, 241p. <br /> Advanced GeoEnvironmental, Inc. (AGE) Quarterly Report - First Quarter 2005, 466 Moffat <br /> Boulevard, Manteca, California. <br /> Advanced GeoEnvironmental,Inc. <br />