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08 September 2000 AGE -NC Project No. 97-0372 Page 14 of 18 5.3. GROUND WATER SAMPLING An attempt to collect ground water samples will be made in two areas; the area where low pH and elevated copper concentrations have been encountered near boring B7 and in the boring to be advanced near the municipal water well. In addition, the municipal well will be sampled. Ground water samples will be collected from two probe borings utilizing a Geoprobe water sampling assembly. The sampling assembly will consist of probe rods fitted with a retractable PVA ground water screen and will be advanced to the total depth of the probe boring. The rods will then be pulled upward to expose the screen section and to allow ground water to flow into the screen. Water accumulating in the screen casing will be sampled utilizing a bailer constructed of a bailer fitting on the end of %-inch diameter polyethylene tubing, which will be inserted into the exposed screen, through which water will be manually pumped. The ground water sample will be collected into three EPA -approved 40-m1 VOA vials containing 0.5 ml 18% HCl as a sample preservative and into a 1 -liter plastic container lacking a preservative. The chain -of -custody and sample label will note that the 1 -liter sample does not contain a preservative and has not been filtered. California Water Service Company will purge the inactive municipal water well on the adjacent property by pumping the well and discharging the produced water into the stone water drainage system. Upon completion of the purge, a water sample will be collected from a sampling port on the discharge line. Water samples will be collected into three EPA -approved 40-m1 VOA vials and into one 1 -liter plastic container as described in the paragraph above. All ground water sample containers will be labeled with the boring designation, date and time of sampling, and the sampler's initials. The properly labeled samples will be stored in a chilled container pending shipment to a DHS -approved analytical laboratory. 5.4. SHIPMENT OF SAMPLES All samples will be recorded on a chain -of -custody form with sample identification, sampling data and time, and sampler's name. Desired analyses will be indicated on the chain -of -custody. Properly preserved and labeled soil samples will be sealed in plastic bags and placed on the bottom of a plastic ice -chest. The samples will be covered with chilled "blue -ice" or ice -cubes and the chain - of -custody form, also sealed in a plastic bag. The chest will be filled with material to prevent unnecessary movement and possible marring of the sample containers. The chest will be sealed and delivered directly to a DHS -certified laboratory or will be shipped via an overnight delivery service. If a Saturday delivery is necessary, the laboratory will be notified so that an employee of the laboratory will be present to accept the shipped samples and properly care for the samples. Advanced CeoEnvironmental, Inc