Debris Basin Maintenance Program Initial Study/Mitigated Negative Declaration

Pursuant to the California Environmental Quality Act (CEQA), the Los Angeles County Flood Control District (LACFCD) has made available for public review the IS/MND documentation required to support the issuance of a Section 1605 Long-term Streambed Alteration Agreement (Section 1605 Agreement) from the California Department of Fish and Game (CDFG) for continued implementation of the LACFCD's Debris Basin Maintenance Program (Maintenance Program) for 162 existing debris basins.

The proposed Maintenance Program does not involve new construction, expansion or alteration of the debris basins, but rather includes longstanding and ongoing maintenance activities that protect downstream properties by allowing the debris basins to adequately serve their main functions for debris flow reduction and flood control.

The operation of the Maintenance Program involves several basic activities carried out at the 162 debris basins throughout the County of Los Angeles. In the course of one year, each of the 162 debris basins receives at least one round of routine maintenance, which may include: (1) annual brush clearing, tree trimming, and vegetation mowing; (2) annual entrainment channel and sediment/vegetation clearing around the outlet tower for drainage; (3) sediment removal; (4) access road maintenance and other appurtenances; (5) State Division of Safety of Dams (DSOD) compliance; (6) storm damage repair and restoration projects; and/or (7) exotic/invasive vegetation species eradication control.

As part of the issuance of the Section 1605 Agreement, the LACFCD is not proposing any change to ongoing activities that are being implemented under the Maintenance Program. Therefore, continued implementation of the Maintenance Program does not represent a change to the environment, and any potential environmental impacts identified within this IS/MND do not represent a change from historic activities under the Maintenance Program.

The IS/MND will be available for public review and comments from Friday, December 3, 2010 through Monday, January 3, 2011. All comments should be mailed to: County of Los Angeles Department of Public Works (LACDPW), 900 S. Fremont Avenue, Annex Building, 2nd Floor, Alhambra, CA 91803, Attn: Ms. Jemellee Cruz, Flood Maintenance Division or emailed to:

The IS/MND, as well as all referenced documents, will be available for public review at the LACDPW office listed above between the hours of 7:00 am to 5:00 pm Monday through Thursday. The documents can be reviewed via links below as well as at the following 17 public libraries during normal business hours: Agoura Hills Library, La Canada Flintridge Library, La Crescenta Library, Monrovia Public Library, Pasadena Central Library, Glendora Library, Glendale Central Library, Montrose-Crescenta Branch Library, Pacific Palisades Library, Palmdale City Library, Platt Branch Library, Sunland-Tujunga Branch Library, Rowland Heights Library, Sylmar Branch Library, South El Monte Library, View Park Library (Los Angeles), and Valencia Library.

Documents links:

Initial Study/Mitigated Negative Declaration
Notice of Intent to Adopt a Mitigated Negative Declaration
Appendix A- CDFG Draft 1605 Long-Term Agreement for the Debris Basin Maintenance Program
Appendix B- Debris Basin Rankings and Vegetation Replacement Ratios (Large File! Right-Click the link and select Save Target As)
Response to Comments and Errata(New)

If you have difficulties downloading above Appendix B as one large file please try smaller split into six parts links below:

Appendix B - Part 1,   Appendix B - Part 2,   Appendix B - Part 3,   Appendix B - Part 4,   Appendix B - Part 5,   Appendix B - Part 6