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A photionization detector (PID will fie used to evaluate the presence of hydrocarbon <br /> vapors in soil samples. Field instruments, such as the PID, are useful for indicating <br /> relative levels of volatile organic hydr Icarbon vapors but do not detect the concentration <br /> of hydrocarbons present with the same precision as laboratory analyses. <br /> Sampling of Stockpiled Soil <br /> The drill cuttings will be temporarily stored on on-site in a soil bin before disposal at an <br /> appropriate disposal facility. Soil samples will be collected from the stockpiled soil by <br /> driving a clean brass sleeve into the stockpiled soil. Once filled, the sleeve will be <br /> promptly sealed with Teflon tape and plastic caps. The sample will then be labeled and <br /> placed in iced storage. Chain-of-custody records will be initiated by the geologist and <br /> accompany the samples to the analytical laboratory. <br /> Logging of Borings <br /> Soil samples will be logged using the Unified Soil Classification System. The texture, <br /> color, moisture, plasticity, and consist, of soil, the blow counts, and subjective <br /> evidence of hydrocarbons, such as soil staining, obvious product odor, and PID <br /> (or similar instrument)readings, will be>poted in the field on the logs of borings. <br /> Groundwater Monitoring Well Construction <br /> The groundwater monitoring wells will be constructed in the borings with thread jointed, <br /> 2-inch-inner-diameter, Schedule 40 PUC casing. No chemical cements, glues, or <br /> solvents will be used in well construction-The screened portion of the wells will consist <br /> of a factory-perforated casing with 0.020 ch-wide slots. The annular space in the wells <br /> will be packed with#3 sand (or equivalent)to approximately I to 2 feet above the slotted <br /> interval. A 2-foot-thick bentonite plug will be added above the sand pack to prevent the <br /> cement from entering the well pack. The remaining annulus will be backfilled to grade <br /> with bentonite cement slurry. <br /> The wells will be protected with a traffic-rated, utility box, equipped with a bolt down <br /> lid and a watertight seal to protect against surface-water infiltration. The design of this <br /> box discourages vandalism and reduces the possibility of accidental disturbance of the <br /> well. <br /> C:\iMyDocuments\Projccts\portofStockton\WellInstall\workpI .doe <br /> A-2 Rev.0,4/9 <br />