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<br />SP90-296 - 3 - November 2, 1990 <br />Maier stewart & Associates <br /> <br /> <br />encountered beneath the fill, to a depth of roughly 14 f7et. . <br />These soils were brown to gray, and wet or water-bearlng. <br />Below the 14-foot depth, gray, wet, sandy clays were <br />penetrated. These soils continued to the 25. 5-foot <br />termination depth of the boring. <br /> <br />Water was measured at a depth of 21~ feet during drilling. <br />After the drilling auger was withdrawn, the water level rose <br />to a depth of 9 feet. <br /> <br />SOIL PERMEABILITY EVALUATION <br /> <br />The ability of a soil to transmit water depends in part on <br />the soil's permeability, or hydraulic conductivity. In this <br />case, water percolating through the pond bottom passes <br />through silty and clayey sands, and sandy clays. These <br />materials, because they contain a significant percentage of <br />fine grained particles, have limited available area for the <br />flow of water. Thus, the rate of flow, or permeability, <br />would likely be very low. <br /> <br />Using textbook charts which correlate soil classification <br />with relative permeability, we would expect flow rates <br />through the dominant clayey soils to be on the order of 0.1 <br />feet per year or less. This rate is considered impermeable, <br />for the circumstances described. Al ternate methods for <br />dispersal of the water (other than absorption into the soil) . <br />appear, therefore, to be prescribed. <br /> <br />REMARKS <br /> <br />The information and discussions presented above are based on <br />the results of a single penetration test boring. Variations <br />in the nature and distribution of the soils encountered are <br />likely across the site. With the limited information, we <br />cannot predict how such variations might affect the ability <br />of the subsurface soils to conduct water in either a <br />vertical or horizontal direction. <br /> <br />Services performed by the geotechnical engineers for this <br />project have been conducted in a manner consistent with that <br />level of care and skill ordinarily exercised by members of <br />the profession currently practicing in this area under <br />similar budget and time restraints. No warranty, expressed <br />or implied, is made. The content of this report and <br />supporting documents are for the exclusive use of Maier <br />Stewart & Associates, Inc. In the absence of our written <br />approval we make no representation and assume no <br />responsibility of any other parties regarding such content. <br /> <br /> <br /> <br />. <br />l BRIIOn'l <br />