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25 May 2004: <br /> AGE-NC Project No. 0471180 <br /> Page 5 of 5 <br /> 4.4. EQUIPMENT DECONTAMINATION <br /> Prior to use,'all sampling tools used for sample collection will be thoroughly rinsed with clean water <br /> after being washed with-.a with- .solution' of Alconox. All probing rods will .be`cleaned prior to <br /> advancement at each probe boring location. ` <br /> 4.5:. BORING ABANDONMENT Y <br /> All probe borings will be permanently sealed to prevent vertical migration ofpotential 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, 1951;Geologic Features and`Groundwater_Storage Capacity"of the Sacrathento Palley; California, U..S. Geological Survey Water Supply Paper 1497, <br /> 241p.. <br /> Advanced GeoEnvironmental,Inc. , <br />