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/~-ia ---- -- --- -- - <br />1 <br />~~ <br />.. .:~ <br />~~ <br /> <br /> <br />•~.; <br />K:t <br />U <br />- <br />mvnno~m nn~w on ,.vm r.an ,.,n.. <br />~ <br />.._. ... ._.. .. ., .._~.,. .~-. .._...~~....._.. .~.. <br /> , '_~ '~ <br />.S <br />. <br />i varied from determining the volume of a large, irregularly shaped hole t0 'A <br />;~Y+ <br /> <br />accurately weighing large masses of soil and rock. ; <br />` <br />~';;'i<~; <br /> •~=~G~ <br />~'i= <br />{ ~'.. <br />i <br />-~ie,,~netho.d.~~u,ltimately selected consisted of combining an ~ongoin,g field ~ <br />ssurvey operation with laboratory data obtained from a previous investiga y~ <br />~tion at the site by Chen & Associates, Inc. <br />. <br /> . <br />'; <br />The results of 75 moisture content and moisture content-dry density deter- a';; <br /> <br />minations by Chen & Associates, Inc., were averaged to arrive at the unit .;` <br />weights and moisture contents tabulated below: ~ ;;y=p,^ <br /> <br />Total Unit height ~~+"'. <br />~,+, <br />Dry Unit 4leight Moisture Content Pounds Per ~.',, <br />Material (Pounds Per Cubic Foot) (Percent) Cubic Foot <br />Sand 109.4 15.9 126.8 ' <br />Clay & Silt 99.7 22.4 122.1 <br />Sandstone 111.7 12.5 125.7 <br />Siltstone & <br />Cla stone 108.1 15.6 <br />aV4e,r--age T.ot-al Unit Weight: ~a:l_84,9~I <br />~ I <br />I <br />Lyo"ncurrent with this investigation was an effort by M-K'Itline Operations>an:tl <br />Yampa Mining personnel to determine an,overburden/interbourden~swell fac.toea5, <br /> <br />T=,~is• was done by topograohic survey comoarin~_excavatedl <br />volumes with spoi <br />l <br />pp <br />end coal volumes. A swell factor of~s23 percent was. de~te(rmined:'~ <br />A review of the laboratory data by Chen & Associates, Inc., revealed that ~' <br />the average total unit weights of each soil or rock type varied from the <br />average of these by about two percent. As this is believed to be well ;:~ <br />within the accuracy of the analyses to be performed using this data, it was <br />assumed that the bank unit weights (prior to excavation} were the same for <br />all materials. ~i'e"-'a.verage total "unit weight was foundE' to be 124.•:9 aou'n.~s~ ~~!~ <br />er•;:;cubic 'foot. Applying the swell factor ° the in-olac~•densty was'rcal <br />fated to be 101.5 pounds per cubic foot. This value was compared with <br />values from another project currently underway, and found to be slightly <br />higher, but reasonably close to those determined in the other study. <br />value of 102 pounds per cubic foot was used in the analyses. <br /> <br />< ,~ I <br />-3- . . <br />