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eh <br />• ESPEY, HUSTON b ASSOCIATES, INC. <br />watershed is not significantly incised and is contained within a generally nazrow <br />valley bottom area of varying width. The valley bottom area is characterized by a <br />single valley fill unit that consists of transported alluvial deposits with some <br />interbedded colluvial material. An alluvial fan has developed at the mouth of the <br />tributazy drainage near its confluence with Curtis Creek. <br />The valley bottom of Curtis Creek is chazacterized by a simple lower <br />terrace unit which forms a topographic floodplain and contains an incised, meander- <br />ing stream channel. The channel of Curtis Creek has been impounded at several <br />locations. Two stock ponds aze also present along aforementioned valley bottom of <br />the tributary drainageway. These will be removed as part of the diversion ditch <br />construction. <br />Afield investigation was undertaken to chazacterize the proposed refuse <br />• disposal azea and to obtain samples for geologic interpretation. No azeas of slope <br />instability were noted. The field investigation consisted of three borings that were <br />_, sampled and piezometers installed (August 1979 by others), thirteen testpits (August <br />1979 by others), and an additional fifteen borings with piezometers installed (May <br />1980 by EH&A) (see Logs of Boring Appendix). <br />Geological cross sections YY and ZZ were prepazed from testpit and <br />boring log data. These two sections are intended to show the character of the azea <br />beneath the disposal azea. A plan view showing the location of the cross sections as <br />well as the sections themselves can be seen in Fig. 13.2.1. A layout of the testpit <br />and boring sites can be seen on Fig. 13.2.2. <br />These pits and borings were generally designed to investigate the soils on <br />the site and were terminated at bedrock. A variety of soil types were found in these <br />investigations ranging from clay to sand. The clay and/or clayey silts were not <br />found to be contiuous or dominant. The site can generally be chazacterized as sandy <br />. silt which can be expected to drain readily. <br />13-3a <br />