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Once the top of the groundwater table has been reached, a Geoprobe", push driven water sampling device will be advanced 2 to 3 feet into the water bearing zone. The water sampling device consists of a steel inner core well screen nested inside a steel outer sampling sheath. The sampler is kept sealed while being driven to the desired sampling depth. At the desired sampling depth, the outer sheath of the sampler is pulled up approximately 2 feet exposing the inner core steel well screen. A groundwater sample will be extracted by lowering a stainless steel bailer through the hollow center of the push rods into the screen section. In addition, a groundwater sample may be collected through a teflon or vinyl tube inserted through the push rods, and drawing the sample to the surface using a peristaltic pump. Groundwater samples will be filtered in the field through a 0.45 micron filter and collected in pre-preserved 500-ml polyethylene containers supplied by the laboratory. Following collection, samples will be labelled, and placed in a cooled ice chest. The time, date, location, and sample identification number will be recorded on the chain-of-custody. Following sample collection, sample labels will be affixed to the sample containers with the following information: sample number, depth, date, collector name, owner, location, job number, and time of collection. Appropriately sealed and labeled samples will be placed in cooled ice chests. The ice chests will also serve as containers for delivering samples to the analytical laboratory. Chain-of-custody records will be maintained using standard forms, and i routed to the analytical laboratory with the sealed ice chests containing the samples. 4.3 ABANDONMENT All soil borings will be permanently sealed to prevent vertical migration of contaminants. Soil borings shall be abandoned by backfilling, from bottom to the surface, with Holeplug'', EnviroplugTM', Volclaym, or a cement-bentonite grout slurry. Boreholes that extend below the water table can be poured from the surface. r 4.4 DECONTAMINATION All downhole equipment and tools will be cleaned between borings to prevent cross- contamination into the next boring. After each use, continuous core barrels, soil samplers, and groundwater sampling probes will be scrubbed using a brush and non-phosphate cleaner, rinsed with potable water, and final rinsed with de-ionized water. All decontamination rinsate will be discharged to the ground. SAC 187.14 6