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<br /> <br /> <br />1 <br />1 <br />1 <br />1 <br />1 <br /> <br />LJ <br />1 <br /> <br />CTL/THOMPSON, INC. LL~~~~-JJ <br />CONSULTING GEOTECHNICAL AND MATERIALS ENGINEERS <br />March 5, 1979 <br />Superior Sand & Gravel <br />123 Santa Fe Drive <br />Denver, Colorado 80223 <br />Attention: Mr. Keith Merilatt <br />Subject: Sand and Gravel Investigation <br />Sand Creek & Picadilly Road <br />Arapahoe County, Colorado <br />Job No. 5175 <br />Gentlemen: <br />As requested, we have completed exploratory borings and laboratory <br />analyyses for the subject project. The purpose of this investigation <br />was to determine the approximate extent and depth of sand within the <br />site for evaluation of the site as a source of aggregate. <br />Eight exploratory borings were drilled at the locations selected by <br />Mr. Merilatt of Superior Sand and Gravel• The approximate locations <br />of the borings are shown on Fig. 1. Borings were drilled February <br />21, 1979 using a 4-inch diameter continuous flight paver auger. Logs <br />of the soils encountered in the exploratory borings and penetration <br />resistance values are shown on Fig. 2. Samples of the sand strata <br />were taken using a 2.5 inch diameter California drive sampler and a <br />2.5 inch diameter thin wall Shelby tube. <br />' The subsurface conditions at the site consisted of clean to silty <br />sands extending from the existing ground surface to depths ranging <br />from 12 to 42 feet. Clay strata were encountered within the sand <br />stratum in three of the borings and it varied in thickness from <br />' approximately 3 to 13 feet. Bedrock was encountered at depths rang- <br />ing from 12 to 42 feet in the borings and it consisted of weathered <br />claystone bedrock and unweathered claystone and interbedded sandstone. <br />' Occasionally zones of well cemented sandstone were encountered in the <br />bedrock. Exploratory boring TH-2 encountered practical auger refusal <br />at a depth of 32 feet. <br />' Free water levels were measured at the time of drilling. Free water <br />was encountered in three of the test holes at depths ranging from 10 <br />' to 13 feet below the existing ground surface. <br />1 <br />' 1701 SOUTH FEDERAL BLVD. SUITE D DENVER, COLORADO 80219 (303) 9345x73 <br />