environmental assessment for the hog lake road improvement project

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Ramona Hog Lake Road Improvement Project August 2011 along the roadway already occurs and dirt roads are known to produce fine sediment in streams. Proposed Action: For the Proposed Action alternative, generalized impacts to jurisdictional drainages would be expected as a result of equipment use, soil disturbance and construction of the box culvert. These include an increase in erosion and sedimentation as well as the potential for the discharge of hazardous materials. Channeling along the roadway already occurs and dirt roads are known to produce fine sediment in streams. Construction of the road could result in increased erosion and sedimentation with disturbed soils and release hazardous materials from heavy equipment into the streambed. The proposed action includes the use of a culvert with sufficient size and capacity to pass the flows and associated debris from a 25-year return interval storm. While the Forest’s Land Management Plan requires sufficient size to accommodate a 50-year storm, the project as designed is consistent with BIA standards. As this project is a BIA proposal and the road will be brought into the BIA Transportation System, with the BIA assuming responsibility for road maintenance, the Forest proposes to allow a site specific amendment to the Forest Plan in order to accommodate the BIA. Direct effects associated with implementation of the Proposed Action are estimated as follows: for the blueline (BL), federal/ACOE 3,977 sf., state/CDFG 6,099 sf.; drainage 1, federal /ACOE 170 sf., state/CDFG 170 sf; and drainage 14, federal/ACOE 140 sf., state/CDFG 160 sf. Total impacts are estimated at 4,288 sf (0.098 acres) federal/ACOE and 6,429 sf (0.148 acres) state/CDFG jurisdictional area. Indirect effects associated with implementation of the Proposed Action alternative include impacts resulting from earthmoving or other construction activities that could result in discharge of hazardous materials, silt, debris, or excessive erosion into waters of the U.S. during Project construction. Direct effects associated with the smaller BIA 25-year culvert design, rather than a 50-year design, could include debris plugging the culvert during storm events that exceed the capacity of the 25-year culvert. Water could be forced out of the existing channel and could erode the embankments or cause the loss of the road structure. Indirect effects include that the loss of the road could cause access to the Reservation to be limited to other, longer routes. Frank Springer & Associates, Inc. Page 73 of 79 Environmental Assessment
Ramona Hog Lake Road Improvement Project August 2011 Figure 12: Watersheds and Wilderness Areas Frank Springer & Associates, Inc. Page 74 of 79 Environmental Assessment
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FINAL FRANK SPRINGER & ASSOCIATES,
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LIST OF TABLES Table 1: Mitigation
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