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Mr. David Shelton
<br />December 12, 1983
<br />Page Four
<br />5. Water levels, pH, electro-conductivity and temperature will be measured in alluvial
<br />monitoring wells on a monthly basis. Analyses for the following parameters will be
<br />taken once for Apache and Santistevan Canyons in alluvial monitoring wells: total
<br />dissolved solids, carbonate, bicarbonate, chloride, sulfate, sulfide, ammonia,
<br />nitrate/nitrite, calcium, magnesium, potassium, sodium, boron, cadmium, copper,
<br />iron, lead, manganese, mercury, nickel, selenium, zinc, silver and SAR. All metals
<br />will be analyzed on a dissolved concentration basis. Monitoring of the Ciruela
<br />Canyon well will continue until a formal request is made to reduce monitoring
<br />requirements, as stipulated in the Proposed Decision and Findings of Compliance
<br />Document.
<br />6. In addition to the hydrologic baseline data, it is Wyoming Fuel Company's
<br />understanding that emperical data collected from the Allen Mine for these canyons
<br />which have been undermined will provide substantial evidence for determining the
<br />effects of future undermining of these canyons.
<br />Surface Water. The Division was unable to assess the potential impacts of
<br />secondary or retreat mining on Ciruela Canyon, Santistevan Canyon, and Apache Canyon,
<br />because there was insufficient information to completely describe the flow
<br />characteristics of these canyons. In addition, the quality of the Ciruela Canyon drainage
<br />was not fully addressed. To fulfill and resolve these informational deficiencies so
<br />secondary and retreat mining under these canyons can be allowed, Wyoming Fuel Company
<br />will conduct the follo~,ving studies:
<br />1. Wyoming Fuel Company will monitor stream flows in Santistevan and Apache
<br />Canyons at downstream locations. Ciruela Canyon flows will be monitored above
<br />the mine water discharge point and below the coal processing pile. The approximate
<br />locations for these monitoring points are shown on Figure 1. Wyoming Fuel
<br />Company will contact the Division for concurrence on these locations once Wyoming
<br />Fuel Company has made a field verification for site suitability.
<br />2. Flumes will be installed with continuous recorders in Santistevan and Apache
<br />Canyons. The Division has suggested the HL type flume would probably be the most
<br />effective. The method of flow analysis in Ciruela Canyon has not been determined,
<br />however, the Division does not feel a flume in this Canyon is necessary.
<br />3. Flows in these canyons will be measured at a frequency to differentiate seasonal
<br />flow variations.
<br />4. Water quality parameters in Ciruela Canyon at the above location will be monitored
<br />quarterly as follows: pH, electro-conductivity, temperature, turbidity, total
<br />suspended solids, total dissolved solids, total combustible solids, total hardness, total
<br />recoverable iron, manganese, carbonate, bicarbonate, chloride, sulfate, ammonia,
<br />nitrate/nitrite, calcium, magnesium, potassium, sodium, boron, cadmium, copper,
<br />lead, mercury, nickel, seleniwn, silver and zinc and a determination of SAR.
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