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Mr. Bill Agnew - 2 - May 20, 1991 For this reason, we can allow the above-listed wells to be monitored for water quality on a semi-annual basis. The following sites, however, must be monitored in accordance with the existing permit plan: GE3, GF6, GFII, J1, P1, P3, and P8. This change is granted with the understanding that if future impacts become significant, monitoring on a quarterly basis may be required again. Please note that well GO-3 must be monitored quarterly for water quality if ash disposal occurs in the area. Please revise pages 4-247a, 4-247b, 4-247c, and 4-247d to refl ect the decision described above. Section 3.0 - Drainageway Reconstruction, Improvements and Repairs (1990) 1. This section was reviewed in detail, and found to be in compliance. Section 4.0 - Regraded Spoil Sampling The results and findings in this section are acceptable. Please continue to closely monitor the isolated area from which the low pH value was obtained. Section 5.0 - Topsoil Stockpile Locations (1990) 1. The information in this section is adequate. We may conduct a field inspection to ensure that all topsoil piles are Droperly refl ected on Maps 5-1 and 5-2. Section 6.0 - Livestock Ponds (1990) 1. The information contained in this section is adequate. Have the modifications referenced in the September 26, 1990 letter from the Soil Conservation Service, Item No. 5, been completed? If not, Dl ea se provide a work schedule. Section 7.1 -Vegetation Monitoring for Seeding Exclusion in 1989 Derringer Pit Topsoil Area 1. As required, Trapper submitted vegetation monitoring data on the 56 acre no seed plot. As they stated, the expected initial vegetation response was mostly annual/biannual plant species, and the data supported this assumption. Unfortunately, the woody plant species did not establish in the densities hoped for. Also grass species are present in very low num5er which may help woody plants become established. The data indicates what would be expected at this point, and at least two to three years of data will need to be evaluated before a good preliminary assessment can be made.