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III IIIIIIIIIIIIIIII <br />ENTEC91=1 <br />ENGINEERING, INC. <br />5585 ERINDALE DR. SUITE 100 <br />COLORADO SPRINGS, CO 80918 <br />1718) 5715599 <br />November 30, 1988 <br />Rocky Mountain Asphalt, Inc. <br />1910 Rand Avenue <br />Colorado Springs, Colorado 80906 <br />Re: Summit Pit <br />Test Pit Investigation <br />Gentlemen: <br />As requested personnel of Entech Engineering, Inc. observed the <br />test pits excavated at the above referenced site. The purpose of <br />the investigation was to observe the soil conditions encountered <br />and determine the depth to bedrock in the proposed Summit Pit <br />site. This letter presents the results of our observations of the <br />test pits excavated on November 23, 1988. <br />The test pits were excavated by Rocky Mountain Asphalt, Inc. with <br />a backhoe with a rock bucket. The approximate location of the <br />test pits are indicated on Figure 1. The conditions encountered <br />in the test pits generally consisted of a very thin layer of 1 to <br />2 inches of topsoil, a laver of silty sand and gravel over <br />highly weathered to weathered granite. Typicaly refusal was <br />encountered at depths ranging from 3 to 4 1/2 feet. In Test <br />Pit No. 8 refusal was encountered at a depth of 6 feet. Water was <br />encountred in TeaO Pito 2 and 3 at depths of 2.5 and 1.5 fee t <br />respectively. A description of the materials observed at each <br />test pit is given on Table 1. <br />A sieve analysis of the upper soil material was performed to <br />determine the grain size characteristics of these materials. The <br />soils classify as a silty sand with scattered gravels, SM. The <br />grain size analysis curve is shown on Figure 2. <br />In general, the highly weathered granite on this site is <br />approximately 2 feet thick. Belo~o this highly weathered zone more <br />competent granite which could not be excavated with the. rock <br />bucket was encountered. The conditions discussed jn this letter <br />are based on visual observations of test pits excavated with a <br />backhoe. The materials encountered at a depth of a few feet will <br />not be highly erodable. <br />D!FlNDANTS <br />ENisiT <br />Gesell: g <br />+.~.o.o•.o-o^o"a"i <br />