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

i
' t ~~',' CORE LABOR/~-TORIES
Westena Atlas
International
' i11TIP~QIPY
HUMIDITY CELL TESTS
' INTRODUCTION
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 model 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 are a 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 blended. Air-dl-ied, 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 connec:ted 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 plastic
' tubing and iwo air stones and half filled with deionized water is used
to generate humidified air. Compressed air can feed directly to the
cells (dry air) or through the carboy first and then ~o 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 all 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 l0 weeks.
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