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LAMBERT ASSOCIATES PAGE 04 <br />07!08/2004 15:13 19703822515 - <br />PN: I704155GE <br />July 8, 2004 <br />Page 2 <br />Our services will consist of a geotechnical engineering field and Laboratory study of the subsoil and <br />slope conditions at the Eureka Gtavet Pit site to provide georcchnicai engineering assessment, <br />suggestions and recommendations. Our services to be provided aze outlined below. <br />- The field study will wnsists of observing, describing, and sam¢rling the soil materials <br />encountered in about two (2) to three (3) test borings along County Road 25 and one (1 } ro <br />two (2) test borings at the me of the slope. We will perform detailed observations of the <br />slope area as part of the field study. <br />- Ideally we would like to obtain subsurface information from near the mid-elevation of the <br />eroding area, however we understand that construction of a roadway slang the mid-elevation <br />of the slope is outside of the misting permitted area. We fcel that construction of this access <br />roadway may further dc-stabilize the slope arcs. <br />- We anticipate thax San Juan County will ptovide.traflic control during advancemrnt of the <br />test borings along County Road 25. <br />- We will require a detailed map showing the pre-mining topography of the site, if this <br />information is available, and a tapographic map of the current slope configuration. <br />- Wt plan to use our truck mounted continuous flight auger drill rig to advance the test <br />borings. <br />- The soil materials enwuntered in the test borings will be observed, described and samples <br />will be retrieved for the subsequent laboratory study, Based on the data obtained, logs of the <br />test borings will be prepared. <br />- The laboratory study will consist of tests to help assess the soil strength potential of dtt <br />materials sampled where appropriate. <br />We anticipate that the laboratory study will include the foliowing~ <br />two (2) direct sheaz tests to measure soil strength design parameters. <br />three (3) Sieve anatysis tests, ' <br />three (3) Atterbexg Limits tests, ~ ' <br />moisture content and dry density tests wi[1 be performed on the strengtharid swell- <br />consolidation test samples. <br />'~m~Ert ttttat ~lssIIttYl~ESr <br />CONSIn,TING a£aTECHN2CAL 6NOINEERS AND <br />MATERIALS raS72NG <br />