environmental assessment for the hog lake road improvement project

More documents

Recommendations

Info

Ramona Hog Lake Road Improvement Project August 2011 Prior to the beginning of construction, photographs will be taken at the site documenting the condition of the channel and streambanks to a distance of 5 active channel widths (Active channel width [ACW] is the width of channel inundated by the annual peak flow.) Implementation monitoring will include an evaluation of diversion (if needed), location of excavated or stockpiled material, and disturbed channel restoration Effectiveness monitoring will be more intensive if the channel is flowing due to a localized event or the timing of the installation. If the monitoring shows excess sedimentation or turbidity then the project will be halted pending the installation of additional BMPs. o If the channel is flowing, then a comparison will be made between a location 10 ACWs above the site and 10 ACWs below the construction o If the channel is flowing, then turbidity will be tracked to a distance of 20 ACWs below the site. If the channel is not flowing, then the protocols for effectiveness include: o disturbed channel will be checked to a distance of 3 ACW, 5 ACW, or beyond 5 ACW o if fill is in the channel o if fill and construction material is left in the 5-yr floodplain Monitoring will also be conducted following one winter season after completion of the project to see if sediment is eroding from the site, if material left on site is stable or entering the channel, and if the disturbed channel was returned to pre-construction condition Failure of BMP effectiveness following this monitoring will require adaptive management maintenance to better prevent erosion Forest Service Manual 2500 Watershed and Air Management 1. Region 5 Supplement 2500-92-4 to FSM 2540 gives guidance on water uses and developments. This supplement is not applicable, no withdrawal of surface or groundwater 2. Region 5 Supplement 2500-92-2 to FSM 2526 discusses riparian area management and is further defined by The San Bernardino Supplement to 2509.22 – Soil and Water Conservation Practices Handbook, FSH 2509.22-2005-1. 3. Region 5 Supplement 2500-93-1 to FSM 2530: This supplement is applicable and has been applied through the implementation and use of best management practices (BMPs) and other mitigation measures / design criteria. Erosion control is a concern and is addressed through implementation of an Erosion Control Plan for the Project. 4. FSM 2543 and 2880 are both draft direction for the management of groundwater resources. Manual direction has been applied All alternatives are consistent because there would be no withdrawal of surface and/or groundwater Frank Springer & Associates, Inc. Page 67 of 79 Environmental Assessment
Ramona Hog Lake Road Improvement Project August 2011 Effects Analysis Methodology Analysis Area and Spatial/Temporal Boundaries The analysis area for watershed resources includes Hog Lake Road and a 300-foot buffer. For erosion analysis, effects were analyzed downhill or downstream of the road. For purposes of analyzing direct, indirect and cumulative effects, the spatial boundary was the Forest boundary, one year was used for short-term effects and 20 years was used for long-term effects. Data Sources Information on impaired water bodies was obtained from the California Department of Water Resources website (State of California, State Water Resources Control Board, 2005). Soils within the analysis area were mapped and are described in the Soil Survey Geographic (SSURGO) database for San Bernardino National Forest Area, California CA777 (USDA NRCS 2009) and the Western Riverside Area Inventory CA679 (USDA NRCS 2008). Data for a soil survey area includes a tabular component and a spatial component. The tabular component was imported into a database for querying, reporting and analysis. The spatial component was viewed and analyzed using a Geographic Information System (GIS). Erosion and Runoff Risk Modeling was completed using FS WEPP - Disturbed WEPP. This is a computer model that allows users to quickly evaluate erosion and sediment delivery potential from forest activities and roads. Documentation of the model, assumptions and limitations can be found on the web site: http://forest.moscowfsl.wsu.edu/fswepp. The modeling illustrates to decision makers and the public various erosion and runoff risks associated with the typical soil found on the forest. In general as you increase slope, increase traffic and decrease vegetation on sandy soils, erosion will increase. This modeling provides a baseline to compare alternatives. Existing Condition Elevations of the Project site range from 4,045 feet at Bautista Road to 4,720 feet above mean sea level at the Project’s terminus on the Ramona Reservation. Detailed soil surveys were conducted for the Forest area by the U.S. Department of Agriculture, Natural Resources Conservation Service (USDA 2008 and USDA 2009), and are included as a part of the Soil Survey Geographic (SSURGO) database. Soil types occurring on the site of the proposed Project are as illustrated on Figure 10, Soils. Frank Springer & Associates, Inc. Page 68 of 79 Environmental Assessment
Page 1 and 2:
FINAL FRANK SPRINGER & ASSOCIATES,
Page 3 and 4:
LIST OF TABLES Table 1: Mitigation
Page 5 and 6:
Ramona Hog Lake Road Improvement Pr
Page 7 and 8:
Page 9 and 10:
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
Page 17 and 18:
Page 19 and 20: Ramona Hog Lake Road Improvement Pr
Page 69: Ramona Hog Lake Road Improvement Pr
show all

environmental assessment for the hog lake road improvement project

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?