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III . Cultural and Historic Resources - Rules 2 .04.4 and 2.05.6(4) <br /> No change is required to this section of the findings . <br /> IV. Geology - Rule 2 .04.5 and 2.0 4.6 <br /> No change is required to this section of the findings . <br /> V. Surface Water Hydrology - Rules 2.04.5, 2.04.7, 2.05.3(4) , 2.05.6(3) <br /> and 4.05 <br /> No change to this section as a result of this revision. <br /> VI . Ground Water Hydrology - Rules 2.04. 5, 2 .04.7, 2.05.3(4) , 2 .05.6(3) <br /> and 4.05 <br /> No changes are required to this section of the findings document except for <br /> the monitoring program which has been covered in the previous section. <br /> VII . Probable Hydrologic Consequences of Mining and Cumulative Hydrologic <br /> Impact Study - Rules 2 .05.6. (3) and 2 .07.6(2)(c) <br /> The original findings document noted that there would be an increase in <br /> sediment load due to the extensive road system. However, it was noted that <br /> predicting how much the roads would contribute to a highly erosive area was <br /> nearly impossible. It was noted that natural erosion rates frequently exceed <br /> 200 tons per year. This information was based on suspended and settleable <br /> solid measurements of drainage in undisturbed areas . It was projected that <br /> additional contribution of sediment off the road system would be negligible if <br /> properly maintained. <br /> During the first Permit Renewal in 1988, it was noted that the roads had been <br /> downgraded from haul roads to access roads and were not continually maintained <br /> throughout the year. It was theorized that due to reduced maintenance and <br /> traffic plus reduced surface area, sediment contributions would be decreased . <br /> It is clear that the extensive road system does contribute to the total <br /> sediment load in Coal Basin . What percentage this contribution is remains <br /> unclear. This revision, when fully implemented , will help to reduce the <br /> contribution by: <br /> 1 . Trapping sediment before it exits the road surface ; <br /> 2. Trapping sediment behind the check structures to be constructed in the <br /> conveyance channels ; <br /> 3. Establishing more cover along currently exposed cut and fill slopes ; <br /> 4. Establishing silt fences in tributary channels and at the base of <br /> several fill slopes ; and <br /> -7- <br />