Maps 59, 60 & 64

On December 22, 2010, the U.S. Army Corps of Engineers (Corps), the San Diego Regional Water Quality Control Board and the California Department of Fish and Game were notified that these storm water facilities in Alvarado Creek had overtopped and were flooding adjacent properties. As a result, that situation demanded immediate action to prevent or mitigate loss of, or damage to, life, health, property and essential public services.

The Project was permitted as emergency repairs to publicly or privately owned service facilities necessary to maintain service essential to the public health, safety, or welfare.

The extent of the maintenance was determined by Individual Maintenance Plans (IMPs) prepared for the facilities. Those IMPs identify the: width of channel clearing, maintenance method(s) to be used; equipment type; access roads/paths; and staging areas. The IMPs incorporate Best Management Practices (BMPs) required by the Regional Water Quality Control Board as well as specific protocols to prevent erosion and protect water quality. The extent of the maintenance was also determined by Individual Biological Assessments (IBAs) prepared for the facilities.

The City received the following permits for emergency maintenance of Maps 59, 60 & 64:

• 404 Regional General Permit 63 (SPL-2010-01169-MBS), Issued 12/23/2010, Expires 4/30/2011
• 401 Water Quality Certification, Issued 12/23/2010, Expires 4/30/2011
• 1610 Emergency Streambed Alteration Agreement, Issued 1/05/2011, Expires 4/30/2011

LISTED SPECIES: No suitable habitat to support listed species is present and no take permit is required.

Individual Maintenance Plans

• Maps 59 & 60 (Alvarado Channel) IMP Map Sheet 1
• Map 64 (Alvarado Channel) IMP Map Sheet 2

Maintenance Summary:

• Date of Routine Maintenance - Maintenance work commenced on December 25, 2010 and was completed on February 14, 2011.
• Amount of Debris Removed - Maintenance efforts removed efforts removed 1,864.38 tons of sediment, trash and vegetation from Maps 58 & 60 and 805.39 tons of sediment, trash and vegetation from Map 64 that could have been conveyed downstream to the San Diego River and sensitive intertidal salt marshes downstream.
• Maintenance Activity Reports
  • Routine Maintenance Activity Report Maps 59 & 60 (with pre- and post-maintenance photos)
  • Routine Maintenance Activity Report Map 64 (with pre- and post-maintenance photos)

Compensatory Mitigation:

The effects of the maintenance will be mitigated by restoration and enhancement in the San Diego River near Qualcomm Stadium.