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S ~ III IIIIIIIIIIIII III • 1 w• 999 LY7 CTLITHOMPSON, INC. CONSULTING GEOTECHNICAL AND MATERIALS ENGINEERS July 27, 1990 Mr. Don Wilson ~~~,/EI~~® Leadville Mining & Milling Corporation 700 Carr Street A~JG 7 139A Lakewood, Colorado 80215 RECLAMAT AN MVIgInN Subject: Percent Compaction Measurements Existing Tailing Pond Embankment Leadville Mining & Milling Corporation Mill Near Leadville, Colorado Job No. 17, 106 Dear Mr. Wilson: The results of our percent compaction measurements in The tailing pond embankment aT the Mill are summarized in the following Table. The embankment is located south of the mill building. The embankment centerline is "L" shaped. The long leg of the "L" is oriented east-west and is about 200 feet long. The short leg of the "L" is oriented north-south and is about 100 feet long. The embankment crest is about 15 feet wide and its maximum height about 15 feet. We understand The embankment is constructed of sandy clays and clayey sands excavated from the pond and they were spread in about 8-inch loose lifts and compacted with a sheepsfoot roller. The test locations were on lines at right angles to the embankment centerline. The co mpaction standard used was standard Proctor (ASTM D 698) as we discussed. Fig. I shows the gradation of the soils used for the standard Proc tor test and Fig. 2, the results of the Proctor test and Atterberg limits. Laboratory _ Field Max Dry Test Depth Test Density OMC Density MC Compaction No. Location In. Type PCF 9o PCF % % Soil Type I Midpoint/N-S leg of 8 NUC 117.5 12.5 110.6 14.6 94.1 Clay, sandy, "L" -downhill slope red (CL) 2 Midpoint/N-S leg of 8 NUC 117.5 12.5 113.2 14.8 96.3 Clay, sandy, "L" -crest red (CL) 3 Midpoint/N-S leg of 6 NUC 117.5 12.5 94.1 16.5 80.1 Clay, sandy, "L" -pond side slope red (CL) \ 1971 WEST 12TH AVENVE DENVER. COLORAD08020~ (303)825-0777