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22 February 2000 <br /> AGE-NC Project No. 98-0432 <br /> Page 6 of 6 <br /> encountered, a Geoprobe push driven water sampling device will be advanced three to four feet into <br /> the water bearing zone. Grab ground water samples will be collected using a Geoprobe water <br /> sampling assembly or a pre-cleaned one-inch 0.01 slotted temporary well screen. Each ground water <br /> sample will be extracted by lowering a Teflon bailer through the hollow center of the push rods into <br /> the screen section. Samples will be collected into laboratory-supplied, 40-m1 VOA vials containing <br /> 0.5ml hydrochloric acid as sample preservative and into 1-liter amber containers. The labeled vials <br /> and liter containers will be placed in a chilled container under ice and transported under chain-of- <br /> custody to a DHS-certified laboratory. <br /> 4.4. EQUIPMENT DECONTAMINATION <br /> All sampling tools used for sample collection will be thoroughly rinsed with clean water after being <br /> washed with a solution of Alconox. All probing rods will be cleaned prior to advancement at each <br /> probe boring location. <br /> 4.5. BORING ABANDONMENT AND SOIL DISPOSAL FROM PROBE BORINGS <br /> All probe borings will be permanently sealed to prevent vertical migration of contaminants. Soil <br /> borings shall be abandoned by backfilling with cement-slurry from the total depth to surface grade. <br /> All excess soil will be place into United Nation (UN) and/or Department of Transportation (DOT) <br /> approved drums for storage and/or disposal,pending laboratory analysis for waste characterization. <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, 24lp. <br />