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r Tri-Valley Growers March 24, 1988 Project No. 1582G Page 2 Wil. AT }LY BORING An exploratory boring was drilled to the northeast of monitoring w MW-3 (Figure 2) on January 29, 1986 using a Mobile B-53 truck-mounted drill rig. The rig was situated over the boring location and pre-cleaned hollow-stem auger was used to advance the hole to the uorirPd sampling depth. Soil samples were collected every five feet by driving a pre-cleaned California split-spoon sampler equipped with a 140 pound hammer into the soh ahead of the auger. The sampler was driven a maximum of 18 inches, than retrieved and disassembled into its component parts. Each sample was logged in the field by '~ a geologist using the Unified Soil Classification System. A copy of the log accompanies this report. One brass liner full of soil was selected from each sampling interval, sealed with foil and plastic caps, labeled, and stored on ice for transport to the state-certified laboratory. Chain-of-custody documentation accompanied the samples. The two soil samples retained from i.. the soil boring composited by the laboratory into one sample for analysis. EISA One exploratory boring was advanced to a depth of 24 feet. The soils encountered were sandy silt and silty sand to approximately 6 feet, silty clay and sandy clay from 6 to approximately 14 feet, silty sand and clayey sand from 14 feet to the bottom of the bar' .. Ground-water was encountered in the boring at 8 feet. The subsurface lithology is similar considering the probable depositional environment of migrating stream channels to that observed and reported during our initial investigation. i F WELL gLLATION METHODOLOGY After the boring had been completed, 2-inch schedule-40 PVC flush-joint threaded screen and solid casing was set through the hollow-stem auger. - The auger was then pulled out of the ground a few feet at a time while No. 2 112