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RiP ona Market <br /> Subsurface Soil and Groundwater Investigation III Report <br />' Page 6 <br />'• of a hollow stem flight auger no less than 3 1/4-inch i d and 8 7/8 o d Geoprobe® <br /> Systems was used for an initial phase of drilling <br />' All drilling equipment was thoroughly steam-cleaned before drilling began, to <br /> prevent the introduction of contamination from off site, and between bonngs to <br /> prevent cross contamination <br />' The borings were logged under the direct supervision of a registered professional <br /> using the Unified Soil Classification System The color, texture, moisture, <br />' plasticity (if applicable), consistency of the earth materials, pertinent soil or <br /> bedrock characteristics, and any evidence of contamination will be noted All <br /> water-bearing zones and the depths at which they were encountered are noted on <br />' these logs <br /> All bonngs were drilled in such a manner as to prevent cross contamination <br /> between strata Exploratory soil borings within the unsaturated zone were <br /> backfilled with Bentonite and cement <br /> Upon termination, the boring into the saturated zone was completed as a <br /> monitoring well and backfilled with concrete grout, after a Bentonite seal has <br /> been placed The bonng for the monitoring well was of a diameter at least 4 <br /> inches greater than the 2-inch diameter of the well casing to be used <br /> The cuttings from the drilling operation were containerized on-site during drilling <br /> for proper disposition The proper method of disposal will be dependent upon <br /> results of laboratory analysis This disposal will be the responsibility of the client <br /> unless other arrangements are made <br /> 2.2 Soil Sampling <br /> All soil sampling equipment was thoroughly steam-cleaned before and between <br /> sampling to prevent cross contamination Relatively undisturbed soil samples <br /> I were taken at intervals of not more than 5 feet in order to evaluate the subsurface <br /> materials <br /> I Geoprobe® samples were obtained using a Geoprobe® Systems sampler with <br /> plastic liners For augured bonngs the soil samples were taken using a California <br /> Modified Split Spoon sampler with brass liners or with the use of a Simulprobe A <br /> 140-pound hammer repeatedly falling 30 inches drove the sampler The blow <br /> counts necessary to drive the sampler were recorded for each 6-inch interval to <br /> help evaluate the consistencies of the materials <br /> The laboratory samples did not have headspace and were immediately sealed in <br /> their liners using aluminum foil lined plastic caps The remaining sample was <br /> I <br />