Item 14 Visual Slideshow provided by Staff at MeetingStormwater Regulations, the Los Peñasquitos Lagoon
Sediment Total Maximum Daily Load and the Los
Peñasquitos Lagoon Restoration Project
Stormwater Regulations
Clean Water Act –Federal Regulation
Porter Cologne –California Legislation
MS4 Permit –San Diego Regional Permit
Key terms:
MS4 –Municipal Separate Storm Sewer Systems
TMDL –Total Maximum Daily Load
WQIP –Water Quality Improvement Plan
Los Peñasquitos Lagoon Sediment TMDL
The Sediment TMDL for the Lagoon defines the required target to either mean:
1. The successful restoration of 346 acres of Lagoon salt marsh habitat, or
2. To demonstrate that measures taken to reduce sediment are affecting 346 acres and will achieve lagoon salt marsh
habitat restoration.
Los Peiiasq i
Poway Watersheds
San
Dieguito
Watershed
Los Peñasquitos
Watershed
Los Peñasquitos Watershed Map
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1..•genc: J!i~.«ioni Wltlili' Loe D SJbt.-.ateislws:l &an:IIIC)' P.ll-i1.1i!Ds ~
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~ JwisdlGIIICIIII Bo.i:mrr ~, ol Poway
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Los Peñasquitos Lagoon Restoration Project Overview
Phase 1 Projec1 ComponenlS Phase 1 Construction
mlJ Conoeplual StagYg
Conooplual Access
New MalnCtlanoe! Pnne 2 Project component, (Con<•pIual}
- -New Side Channel$ Lagoon Sal1 Marsll Ri:slorabon
■ • ■ Existing Chan net11 l2S3 Floodplain Enhancem&nt
Channel Enhancement - -TidalCharviel Extension
Los Peñasquitos Lagoon Restoration Project Phase 1
e2SJ PrellmlllolfY Sa:.t Mar5h Res1ontton
--Welland Bl!flCh
Mam Channel
- -$1!ieCnannels
••• Ei<i$li!'lg cnanneis
Cltamel Enhancement
~ FloodplAtn Enhancements
• flapGall!$
New Stormdrain
Phut 1-SUbph~
Phar;e 1A
Phase 1B
Phafie 1C
0.03%
19.10%
75.70%
2.36%
2.81%
Cost Share Breakdown
Del Mar
Poway
City of San Diego
County of San Diego
Caltrans
Conclusion
The Sediment TMDL for the Lagoon defines the required target to either mean:
1. The successful restoration of 346 acres of Lagoon salt marsh habitat, or
2. To demonstrate that measures taken to reduce sediment are affecting 346 acres and will achieve lagoon salt marsh
habitat restoration.
Options
1.Participate in the Restoration Project at the full level currently proposed and
authorize the City Manager to execute the Phase 1 MOU upon approval of the final
version, or
2.Decline participate in the Restoration Project completely and continue to seek an
alternative pathway to compliance, or
3.Proceed with MOU negotiations with the Copermittees, with consideration to
participate in the Restoration Project, subject to City Council approval of the final
MOU at a future City Council meeting.