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evidence of hydrocarbons, such as soil staining, obvious product odor, and photoionization detector (or similar instrument)readings were noted in the field on the logs of borings Sampling of Drill Cuttings Soil samples were collected from the stockpiled drill cuttings by driving a hand-operated percussion sampler fitted with a clean brass sleeve into the stockpiled soil The sleeve was removed from the sampler and promptly sealed with Teflon tape and plastic caps The sample was then labeled and placed in iced storage Chain-of-custody records were initiated by the geologist and accompanied the samples to the analytical laboratory Pending the analytical results of the soil samples, Dillard Trucking of Byron, California arranged for disposal of the drill cuttings at an appropriate disposal facility Vapor Extraction Well Construction The vapor extraction wells were constructed In the borings with thread-jointed, 4-inch-inner-diameter, Schedule 40 polyvinyl chloride (PVC) casing No cherrucal cements, glues, or solvents were used in well construction The screened portion of the wells consists of factory- perforated casing with 0 10-inch-wide slots The annular space in the wells -,.-%as packed with pea- gravel to approximately 1 foot above the slotted interval A 2-foot-thick bentonite plug is added above the sand pack to prevent the cement from entering the well pack The remaining annulus is backfilled to grade with a bentonite cement slurry Wells are protected with a traffic-rated, cast-aluminum utility box equipped with a PVC skirt. The box has a watertight seal to protect against surface water infiltration and must be opened with a special wrench The design of this box discourages vandalism and reduces the possibility of accidental disturbance of the well Groundwater Sampling The sampling and analysis procedures for water quality monitoring programs are contained in this appendix The procedures provided for consistent and reproducible sampling methods, proper application of analytical methods, and accurate and precise analytical results Finally, these procedures provided guidelines so that the overall objectives of the monitoring program were achieved The following documents have been used as guidelines for developing these procedures: • Procedures Manual for Groundwater Monitoring at Solid Waste Disposal Facilities, Environmental Protection Agency (EPA)-530/SW-61 1, August 1977 SAC\N\PJ"80"MI460 7DS-96\11b 2 A-2 Rev 0,1025/96