Laserfiche WebLink
L. 03 October 2003 <br /> AGE-NC Project No. 03-1080 <br /> Page 5 of 6 <br /> 4.3. GRAB GROUND WATER SAMPLING PROCEDURES <br /> rV <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, a hydropunch-equivalent water sampling device will be driven two to three feet into <br /> the water-bearing zone.Ground water samples will be collected with a hydropunch-equivalent water <br /> sampling assembly fitted with one-inch diameter 0.010-inch slotted temporary well screen. Each <br /> tv ground water sample will be extracted by lowering a bailer through the hollow center of the drive <br /> rods and into the screen section.Depending on subsurface and drilling conditions,grab ground water <br /> samples may also be collected directly through the augers using a new disposable bailer. <br /> Ground water samples will be collected into laboratory-supplied,40-m1 VOA vials containing 0.5-m1 <br /> of hydrochloric acid as preservative and 1-L 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 /> r`. <br /> transfer from the field to the analytical laboratory. A chain-of-custody form will accompany the <br /> samples. <br /> LW 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 /> La <br /> 4.5. BORING ABANDONMENT <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 utilizing a tremie pipe from the <br /> L- total depth to surface grade. <br /> 1& <br /> 5.0 REFERENCES <br /> California Division of Mines and Geology, 1981. Regional Geologic Map Series, Sacramento <br /> Quadrangle. <br /> um <br /> Advanced GeuE nvi ron men tal,Inc. <br /> it <br /> 4 <br />