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CTL /THOMPSON, INC. <br />CONSULTING GEOTECHNICAL AND MATERIALS ENGINEERS <br />July 27, 1990 <br />Mr. Don Wilson <br />Leadville Mining & Milling Corporation <br />700 Carr Street <br />Lakewood, Colorado 80215 <br />• <br />Subject: Percent Compaction Measurements <br />Existing Tailing Pond Embankment <br />Leadville Mining & Milling Corporation Mill <br />Near Leadville, Colorado <br />Job No. 17,106 <br />Dear Mr. Wilson: <br />The results of our percent compaction measurements in the tailing pond <br />embankment at the Mill are summarized in the following Table. The embankment <br />is located south of the mill building. The embankment centerline is "L" shaped. <br />The long leg of the "L" is oriented east-west and is about 200 feet long. The short <br />leg of the "L" is oriented north and is about 100 feet long. The embankment <br />crest is about 15 feet wide and its maximum height about 15 feet. We understand <br />the embankment is constructed of sandy clays and clayey sands excavated from <br />the pond and they were spread in about 8-inch loose lifts and compacted with a <br />sheepsfoot roller. <br />The test locations were on lines at right angles to the embankment <br />centerline. The compaction standard used was standard Proctor (ASTM D 698) as <br />we discussed. Fig. 1 shows the gradation of the soils used for the standard Proctor <br />test and Fig. 2, the results of the Proctor test and Atterberg limits. <br />Laboratory Field <br />Max Dry <br />Test Depth Test Density OMC Density MC Compaction <br />No. = Location In. Type PCF % PCF % % Soil Type <br />1 Midpoint/N-S leg of 8 NUC 117.5 12.5 110.6 14.6 94.1 Clay, sandy, <br />"L" - downhill slope red (CO <br />2 ' Midpoint/N leg of 8 NUC 117.5 12.5 113.2 14.8 96.3 Cloy, sandy, <br />(CL) <br />- crest red (C <br />3 Midpoint/N-S leg of 6 NUC 117.5 12.5 94.1 16.5 80.1 Clay, sandy, <br />- pond side slope red (CL) <br />1971 WEST 12 t I i AVENUE • DENVER, COLORADO %- • ( :0 "31 8254) I 7',' <br />