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<br />LACHEL <br />ASSOCIATES <br />Geotechnics 6 Underground Structures <br />December 23, 1996 <br />Mr. John Hickman <br />Western Mobile <br />1590 West 12th Ave. <br />Denver, Colorado 80204 <br />Dear Mr. Hickman: <br />QC^'=I\ICC~ <br />_~. _. , <br />UtL 2 3 i996 <br />.~IVI::C~V _~ ..~a io rni~ :. ~ar::111;Q ~~ <br />RE: Revision 1 <br />Deer Creek Canyon Quarry <br />Jefferson County, Colorado <br />On June 7, 1995, LACHEL & Associates, Inc., Golden, Colorado provided you a report <br />titled A Soil and Rock Slope Stability Evaluation of the Deer Creek Canyon Quarry. We <br />would like to provide an addendum to that report. <br />At the time the field work for that report was conducted, no accurate, large scale <br />topographic maps of the quarry were available. As a result, the height of the various <br />benches examined in the quarry were based on field estimates. Since that report was <br />issued, a topographic map has been produced which more accurately reflects the bench <br />heights. Using the topo map, the maximum height of Bench 1 is 61 ft at the headwall and <br />115 ft for the sidewall. The maximum heights of Benches 2 and 3 are 71 ft and 50 ft <br />respectively. However, the variation in the height of the benches in no way alters the <br />conclusion of the report that at the time of the field examination, no mass failures were <br />evident or expected. <br />We hope that this information clarifies the data in the report and clears up any conflicts in <br />the project data. <br />If you have any questions, please do not hesitate to contact me. <br />Regards, <br />~EL 8 Asso ial/' Inc. <br />.,Gp~O <br />Dennis J. L el <br />President <br />DJL:sb <br />P.O. Box 5266 Golden, Colorado 80401 (303) 279-4321 Fax (303) 279-0414 <br />