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04 February 2004 <br /> AGE-NC Project No. 04-1128 <br /> Page 7 of 7- <br /> 4.3. <br /> 4.3. BORING ABANDONMENT <br /> All probe borings will be permanently sealed to prevent vertical migration ofpotential contaminants. <br /> Soil borings shall be abandoned.by backfilling withportland cement from-the total depth to sufface <br /> grade <br /> 5.0 REFERENCES <br /> California-Division of Mines and Geology, 1=981.,Regional Geologic Map Series;`Sacramento <br /> Quadrangle. _ <br /> Olmsted,F.H.,and G.H.Davis;.,1961,GeologicFeatures.and Groundwater Storage Capacity of the <br /> Sacramento Valley; California, .U.S.:Geological Survey Water Supply Paper 1497,.241p. <br /> _ ,Advanced GeoEnvi ron mental,Inc.. <br />