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iii iiniiiuiiu iii ,^ /~(~~ ACZ Inc. 999 L//-"LJlll I-", 7 Engineering and Environmental Services 1475 Pine Grove Road, Suite 109 P.O. Boz 774018 Steamboat Springs, Colorado 80477 303-879-6260 ~UL 1 6 1991 July 12, 1991 Mrs. Cathy Begej Colorado Mined Land Reclamation Division 423 Centennial Bldg. 1313 Sherman St. -Room 215 Denver, CO 80203 Mined Land Reclamation Division Re: Rockcastle Company -Grassy Gap Mine (C-81-039), Annual Spoil Seep and Spring Survey; Quarterly Sediment Pond Inspection; Surface and Groundwater Monitoring. Dear Cathy: The following reports are enclosed: • Sediment Pond Inspection • 1991 Spoil Seep and Spring Report • Surface and Groundwater Monitoring The Sediment Pond Inspection Seep and Spring Survey were performed on June 28, 29, and 30, 1991 at the Grassy Gap Mine. Corresponding enclosed reports describe related field work and results. As of the date of this letter, no laboratory analysis results are available for samples taken from two springs and no repair work has been initiated at Pond 5/6. NPDES monitoring was performed in May as well as June 1991. In May, only point 005 (Pond 5/6) was discharging. Laboratory results are included with this letter. (Note: Total iron analysis was run on the May sample. Analysis results were well below the permit effluent limitation of 7.0 mg/I, daily maximum). Pond 5/6 discharge point .005, was again discharging and sampled in June. The June laboratory analysis results are not yet completed. Also monitored during the June site visit were surface water locations SW-2, 3, 4, and 5. SW-2 and 4 were flowing at approximately .056 and .134 cfs respectively. Field measurements were taken and are shown in Table 1, Field Measurements. Monitor well MW-3 was also field checked. Water level was found to be 4.12 feet below the top of the casing. Field measurements for MW-3 are also shown in Table 1, Field Measurements. Spoil Wells 2 and 5 were checked and contained no water.