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' Emil's Liquor • . <br /> 1405 California Street, Escalon, California May 20, 1993 <br /> ' Phase H Environmental Audit Page 2 <br /> The borings will be logged under the direct supervision of a registered professional <br /> ' using the Unified Soil Classification System. The color, texture, moisture, plasticity <br /> (if applicable), consistency of the earth materials, blow counts, pertinent soil or <br /> ' bedrock characteristics, and any evidence of contamination will be noted. All water- <br /> bearing zones and the depths at which they were encountered will be noted on these <br /> logs. <br /> ' All borings will be drilled in such a manner as to prevent cross contamination between <br /> strata. Exploratory soil borings within the unsaturated zone will be backfilled with a <br /> concrete slurry mixture. Borings into the saturated zone will be drilled to a maximum <br /> of 20 feet beneath the top of the aquifer being explored. Any perching layers <br /> encountered will be investigated to a maximum thickness of five feet (5') and will be <br /> ' backfilled with concrete slurry, after a bentonite seal has been placed. If a deeper <br /> aquifer is to be investigated, conductor casing will first be grouted into place to seal off <br /> the upper aquifer(s), in series, if necessary, and drilling will proceed through the <br /> conductor casing after the grout has been allowed to set properly. <br /> ' Upon termination, the borings into the saturated zone will either be completed as a <br /> monitoring wells or backfilled with concrete grout, after a bentonite seal has been <br /> placed. All borings for wells will be of a diameter at least four inches (4") greater than <br /> the inside diameter of the well casing to be used. <br /> The cuttings from the drilling operation will be containerized on-site during drilling for <br /> proper disposition. The proper method of disposal will be dependent upon results of <br /> laboratory analysis. This disposal will be the responsibility of the client unless other <br /> arrangements have been made. <br /> 4.0 Soil Sampling <br /> All soil sampling equipment will be thoroughly steam-cleaned before and between <br /> sampling to prevent cross contamination. Relatively undisturbed soil samples will be <br /> ' taken at intervals of not more than 5 feet in order to evaluate the subsurface materials, <br /> however, this sampling interval may be waived in saturated sands in which sample <br /> recovery is not possible. Samples will also be take adjacent to known suspected source <br /> ' areas for analysis. <br /> 1 <br />