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Logging of Borings Soil samples are logged using the Unified Soil Classification System Samples not selected for chemical analysis and the soil sampler shoe are extruded in the field for examination The texture, color, moisture, plasticity, and consistency of soil, the blow counts, and subjective evidence of hydrocarbons, such as soil staining, obvious product odor, and photoionization detector (or similar instrument) readings are noted in the field and on the Logs of Barings Sampling of Drill Cuttings Soil samples are 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 is removed from the sampler and promptly sealed with Teflon tape and plastic caps The sample is then labeled and placed in iced storage Chairs-of-custody records are initiated by the geologist and accompany the samples to the analytical laboratory Pending the analytical results of the soil samples, Dillard Trucking of Byron, California, will arrange for disposal of the drill cuttings at an appropriate disposal facility Groundwater Monitoring Well Construction The groundwater monitoring well will be constructed m the boring with thread-jointed, 4-mch-inner-diameter, Schedule 40 PVC casing No chemical cements, glues, or solvents are used in well construction The screened portion of the well consists of factory- perforated casing with 0 020-inch-wide slots The annular space in the wells is packed with No 3 Lonestar sand to approximately 1 to 2 feet above the slotted interval A 3-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 The well will be 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 Well Development EMCON waits a minimum of 24 hours after well installation before developing the monitoring well to allow the grout to seal Before developing the well, a water sample is collected for subjective analysis from near the water surface in the well with a Teflon 10 bailer cleaned with a laboratory-grade detergent and delonized water The well is developed with a surge block and pump Well development continues until the discharge SAON'TM805\08051400 6AS-981,cbell 2 A-2 Mon 20805-140006 Rev 0 1/18/98