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' <br />WALDEN COAL COMPANY <br />Annual Hydrologic Report <br />October 1, 1987 - September 30, 1988 <br />Surface Water <br />Water flowed in Mann Draw across the Bourg property from March 21, <br />1988 until April 26, 1988 due to snowmelt runoff. Flow measurements <br />were taken at the weir (Exhibit A) and water samples were collected at <br />the points where Mann Draw enters and leaves the Bourg property (Exhibit <br />B). It should be noted that water leaving the property was generally <br />significantly cleaner than that entering the property. <br />Water discharged from two of the four sedimentation ponds during <br />the period of extreme snowmelt runoff. Samples were taken from ponds A <br />and C as they discharged and the results can be found in Exhibit B. <br />Exhibits C are the "Addendum to Discharge Monitoring Reports" filed with <br />the Colorado Department of Health in conjunction with the quarterly <br />C.P.D.E.S. reports. These give possible explanations as to why <br />discharge from these ponds was not in compliance for pH and total <br />settlable solids. <br />Ground Water <br />Ground water depth was monitored at eleven approximately 25 foot <br />deep monitoring wells in Mann Draw on a monthly basis (Exhibits D). It <br />can be seen from the results that as backfilling of the pit progressed, <br />water levels in the wells increased. Well depths were measured in <br />August, September, and October, however those results are currently not <br />available as they are being stored in Jackson County. As soon as those <br />results become available, I will forward them to the Division. The <br />depths taken in November and December indicate some slight lowering of <br />water levels with the onset of winter. <br />A water sample (Exhibit E), was collected from well 30C in June, <br />the only time when there was sufficient water to sample. Results of <br />that sample show no significant differences from samples taken in <br />previous years. <br />Summary <br />Reclamation at the Bourg Mine was completed in October, 1988. All <br />surface water drainage will be controlled through the use of terraces as <br />approved in Permit Revision #1. Ground water will be monitored in two <br />wells in the Spring and Fall of each year. It is expected that water <br />levels will stabilize at pre-mine levels. Surface and ground water <br />quality did not and is not expected to change as the result of mining <br />activities. <br />