PERMFILE67787

• Permit No: M1988112
• IBM Index Class Name: Permit File
• Doc Date: 11/8/1988
• Section_Exhibit Name: APPENDIX F GEOCHEMICAL LABORATORY TEST RESULTS
• Media Type: D
• Archive: No

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CORE LABORAI'ORlES
HUMIDITY CELL TESTS
Tests used to predict the formation of acid mine drainage fall
into two groups. They include static tests which measure the amounts
of acid producing materials and acid consuming materials, and kinetic
tests which attempt to modes the acid producing and consuming processes
that occur in the natural environment. Humidity cell tests fall under
the latter group. Results from static tests are relatively simple to
interpret but may not be representative of naturally occurring
reactions. Humidity cell tests area more realistic model of reactions
in the natural environment but results may be more difficult to
interpret.
METHODS
SAMPLE PREPARATION
Samples are first air dried at room temperature for 24 hours or
until a stable weight is obtained. Air dried samples are then crushed
to minus 10 mesh (2 mm) and thoroughly-blendeda,,_Air-dried, crushed
samples are stored in plastic bags. ..
TEST APPARATUS
The test cells are plastic containers with tight fitting lids.
Each cell is 2.75 inches high, 7 inches long, and 7 inches wide with an
air inlet in the top center of the lid and a drain fitting in the
bottom corner (Fig. 1). A series of 12 cells are connected by equal
lengths of 0.5 inch diameter plastic tubing to a regulated source of
compressed air. A 6,5 gallon glass carboy fitted inside with elastic
tubing and two air stones and half filled with deionized water is used_
to generate humidified air. Compressed air ca.n feed directly to the
cells (dry air) or through the carboy first an3 then to the cells
(humidified air). During testing, cells are placed on wire racks with
glass beakers located below the drain of each cell for collection of
leachate (Fig. 2).
TEST PROCEDURE
Tests can be run on groups of up to twelve samples. 200.0 gms of
prepped sample is placed in a cell. All cells are sealed and hoses
securely fastened. A seven day cycle. is initiated in ali the cells.
First, dry air is passed through the sample cells for three days,
followed by three days of humidified air. On the seventh day, 200 mis
of deionized water is added to each cell and allowed to .soak for 1
hour. The leachate is then allowed.to drain into a.collection beaker,
filtered, and analyzed for pH, conductivity, sulfate, and acidity.
This cycle is repeated for 8 to 10 weeks.
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