_REVISION - M1977208 ‎(3)‎

• Permit No: M1977208
• IBM Index Class Name: Revision
• Doc Name: RESULTS OF SOUTHDOWN INC LYONS PLANT INVESTIGATION INTO ON SITE STORAGE OF CEMENT KILN DUST
• Type & Sequence: TR1
• Media Type: D
• Archive: No

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1.0 Conclusions and Recommendations
Cement kiln dust (CKD) disposal at Southdown's Lyons quarries was
investigated to determine if there could be potential impacts to surrounding
ground water resources.
Pertinent findings are summarized as follows:
1. Disposal of the CKD in C-Pit is allowed under CMLRB Permit No. M-
77-208
2. Disposal of CKD in C-Pit presents little or no impact to ground water
resources in the area.
3. Laboratory analysis of CKD leachate for 46 parameters indicated
compliance with applicable ground water standards for 41 of those
parameters.
4. The five parameters that exceed applicable ground water standards
only slightly exceed those standards. The parameters are:
- selenium
- thallium
- total dissolved solids
- pH
- gross beta
Gochemical computer modeling of the transport and fate of these five
parameters over distance and time indicates that they dilute to a
concentration that complies with ground water standards before they
could potentially migrate off of Southdown's property to the locally
utilized aquifers.
The rock formations adjacent to and beneath C-Pit have relatively low
permeability. The bedding planes in these sedimentary rocks do not
provide a hydraulic connection with the alluvial or Dakota Sandstone
aquifers. Permeability perpendicular to or across bedding planes is
extremely low. These factors create a favorable CKD storage
environment
6. Southdown's current practice of frequent{y wetting the CKD with water
from a battery of large sprinklers is an excellent management practice
for fugitive dust control. Also, Southdown will pump standing water in
C-Pit to the cement plant for use and for recycling into the sprinkler
system, thus reusing excess sprinkler water that may run off the CKD.