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0 <br /> Revised Work Plan For Soil and Groundwater Assessment 7 <br /> Ranch Market 23569 South Santa Fe Road Riverbank California April 25,2000 <br /> depth of the deep well MW-5D and possible soil sample collection intervals. <br /> Phase 1-Deep Continous Core Soil Borings <br /> SECOR will supervise the drilling of two soil borings, SB-1 and SB-2, using a truck-mounted <br /> mud rotary drilling rig to an assumed depth of 140 feet. The actual depth of the two soil <br /> borings will match the depth of domestic well, DW-2, that will be determined by a down-hole <br /> video log in the near future. The first 30 feet of the boring will be drilled using a hollow-stem <br /> auger. The augers will be left in place while the remainder of the soil boring is drilled to a <br /> depth of 140 feet bgs using a rig equipped with a mud rotary system and a 5-foot long continuos <br /> coring barrel. In the upper 30 feet, soil samples will be collected at 5 feet bgs, and at 5-foot <br /> intervals thereafter, or lithologic changes,using a split spoon sampler lined with 2-inch <br /> diameter by 6-inch-long brass sample tubes. Continuous core will be collected from 30 to 140 <br /> feet bgs using a 5-foot long continuos coring barrel. The core barrel will be removed from the <br /> hole, split open and one sample will be collected in 2-inch diameter by 6-inch-long brass <br /> sample tubes for later analyses. In addition to the continuos core, depth discrete soil and water <br /> samples will be collected using a MaxiSimulProbe at depths of 60, 100, and 140 feet bgs. <br /> Details concerning the specific soil and water sample protocol have been in included in <br /> Attachment 4. <br /> Downhole drilling equipment will be steam cleaned before drilling each borehole, and sampling <br /> equipment will be cleaned between each sampling interval. Each soil sample will be screened <br /> for hydrocarbon vapors using a portable photoionization detector(PID). Soils encountered <br /> during drilling will be logged using the Unified Soil Classification System by a SECOR field <br /> geologist,working under the supervision of a California registered geologist. One sample tube <br /> from each sampling interval will be sealed with Teflon pads and plastic caps, then labeled and <br /> placed on ice in an insulated container for delivery to Kiff Analytical located in Davis, <br /> California. <br /> All soil generated through drilling will be placed on and covered with plastic on the Site <br /> pending characterization and disposal. Water generated by steam cleaning will be contained in <br /> a steam-clean trailer and temporarily stored on Site in DOT approved 55-gallon drums. <br /> Based on field observations (PID readings, lithology, odors, etc.), a minimum of fourteen soil <br /> samples will be retained from soil boring SB-1 and SB-2 for analyses. Depth discrete water <br /> Fik:n-Gm be WeHwl.W <br />