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• <br />• <br />r1 <br />L_J <br />MAXI/VI <br />TECHNOLOGIES INC <br />October 17, 1996 <br />Mr. Peter A. Stauch <br />Morrison Knudsen Corporation <br />7100 East Belleview Avenue, Suite 300 <br />Englewood, Colorado 80111 <br />96 South Zuni Street <br />Denver, Colorado 60223-1292 <br />Telephone: 13031744-7105 <br />Facsimle: (3031 744-0210 <br />Subject: Addendum to Preliminary Geotechnical Engineering Study, Bowie No. 2 Mine <br />Surface Facilities, Bowie, Delta County, Colorado <br />Job No. 5002-60-2655.01 <br />Dear Mr. Stauch: <br />We have reviewed the recommendations presented in our Preliminary Geotechnical Engineering <br />Study dated July 10, 1996 regarding the use of a filter fabric placed above boulder rubble fill <br />used as a starter material at the toe of major fills. In our report we indicated that boulder rubble <br />was an excellent material at the toe of fills because of its strength and drainage capability. <br />Where boulder rubble is used as a drainage feature beneath a fill, it should be protected from <br />fines migration by either a filter fabric or a suitable Filter course. If boulder rubble is placed <br />in areas not intended for drainage, it is important the rock be incorporated into a soil matrix to <br />insure that any voids between rock are filled to prevent migration of fines. In this latter case <br />a filter course or fabric would not be required. <br />If we can provide further information, please call. <br />Respectfully submitted, <br />MAJCIA3 <br />~__ <br />David H. Adams, P.E. <br />Rev. By: AJL <br />/DHA <br />+.• s....'.•S <br />~O' `v <br />.-S ~ ~~ <br />;~ , 'f <br />Asleco • Austin Research Engineers •Chen-Northern • Empire Soils Investigations • Kansas City Testing <br />Maxim Engineers • Nebraska Testing • Patzig Testing • Southwestern Laboratories • Thomas-Hartig • Twin City Testing <br />re <br />~: pl <br />4 <br />