Laserfiche WebLink
18 November 2003 <br /> AGE-NC Project No. 03-1080 <br /> Page 5 of 6 <br /> 4.3. GRAB GROUND WATER SAMPLING PROCEDURES <br /> The soil boring will be advanced to the top of the ground water table, as identified by collection of <br /> a saturated soil sample, to collect a grab ground water sample. Once ground water has been <br /> encountered, the grab ground water sample will be collected using a Geoprobe water sampling <br /> assembly with a pre-cleaned one-inch diameter, 0.01-inch slotted PVC screen. Each ground water <br /> sample will be extracted by lowering a Teflon hose-bailer through the hollow center of the push rods <br /> into the screened section. <br /> Ground water samples will be collected into laboratory-supplied,40-nal VOA vials containing 0.5-m1 <br /> ofhydrochloric acid as preservative and I-liter amber bottles without sample preservative.Following <br /> collection the samples will be appropriately labeled,placed on ice and kept in a cooler until delivered <br /> to the laboratory for analysis. Chain-of-custody protocols will be used to document sample custody <br /> transfer from the field to the analytical laboratory. A chain-of-custody form will accompany the <br /> samples. <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 solution of Alconox. All probing rods will be cleaned prior to <br /> advancement at each probe boring location. <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 utilizing a tremie pipe from the <br /> total 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 Ground Water Storage Capacity of <br /> the Sacramento Valley, California, U.S. Geological Survey Water Supply Paper 1497, 241p. <br /> Advanced GeoEnviroumental,Inc. <br />