PERMFILE108426

• Permit No: C1981018
• IBM Index Class Name: Permit File
• Doc Date: 5/13/2002
• Doc Name: Geotechnical Investigation Deserado Coal Mine Waste Banks
• Section_Exhibit Name: Illustration 21
• Media Type: D
• Archive: No

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generally 60 minutes or greater with the exception of Test A in
Sediment Raid RP-2, 3. Based en this information, we conclude that the •
in-situ sand, silt and clay mixtures are relatively impermeable.
LABORATORY TEST RESULTS
Samples obtained from our exploratory test holes were examined
and classified in the laboratory b~+ the project soils engineer.
Laboratory testing was performed on the samples to determine their
classification, moisture-volume change characteristics and strength.
A description of the laboratory test results is included in this
information. laboratory test results are presented in Table I and
Figs. B-1 through B-19.
Swell~onsolidation Tests: Swell-consolidation tests were conducted
on samples of the soils and rock from from the site in order to •
determine their compressibility or swell characteristics under loading
and saturation. Swell-consolidation tests eorx3ueted on samples of the
natural sand, silt and clay mixtures from the site indicate that these
materials have variable characteristics upon loading arc] saturation
(Figs. B-1 through B-7). Some of the samples showed a moderate
tendency to collapse, what saturated under low loads, and a moderate
to high consolidation upon subsequent loading. The dry unit weight of
the soils which collapsed upon saturation varied from 86.6 to 105.1
pcf with an average of 98.4 pcf. The average rtoisture content of
these materials was approximately 6.58.
-- The remaining samples showed a low to noderate tendency to
expand when saturated under lover loads. These samples have somewhat
u