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<br />M00079GE <br />4/20/2000 <br />Page Three <br />^I <br />base aggregate may be altered by adjusting the amount of the <br />overburden sandy clay soil materials to the mix during crushing. <br />~I It may be necessary to spoil much of the overburden sandy clay <br />soil materials to maintain an appropriate range for the Atterberg <br />-' Limits and sieve analysis of the product material. we are <br />available to discuss this with you. <br />-t It has been our experience in Delta County that many of the <br />aggregate quarries have difficulty maintaining adequate plasticity <br />to reduce ravelling of unpaved gravel road surfaces. If the <br />material is used for an unpaved gravel road surface it may be <br />necessary to adjust the amount of minus 200 sieve size material to <br />provide adequate plasticity for the desired use. We are available <br />to discuss this with you. <br />If you have any further questions concerning the geotechnical <br />engineering aspects of your project or if we may be of further <br />assistance please contact us. <br />Respectfully submitted, <br />LAMBERT AND ASSOCIATES Reviewed_~1___ <br />Orman W. nston, P.E. en s a -P...E.. <br />NWJ/nr <br />.I <br />r I <br />I ! <br />r. <br />L ~ <br />L • <br />r~ <br />Y <br />~` <br />_ Lambert ana ~,s',oociateo <br />l CONSULTNG GEOTELN NIC AL EN GIN EEflS AND <br />i MATERIAL TESTING <br />f r <br />