Union City City Council
April 28, 2026

Quarry Lakes Parkway, Phases 1-4
Proposed Mitigation Approach
SF Regional Water Quality Control Board
Coordination Meeting
Tuesday, March 25, 2025
2 Proposed Mitigation Approach-Quarry Lakes Parkway
AGENDA
Meeting Purpose: To update RWQCB on the Mitigation
Approach for the Quarry Lakes Parkway (QLP) project
1) Project Purpose, History and Overview
2) Onsite Mitigation Evaluation and Conclusion
3) QLP 1-4 Area of Impacts Calculations
4) QLP 1-4 Proposed Mitigation Calculations
5) Offsite Mitigation Concept
6) Next Steps
3 Quarry Lakes Parkway Update
2 34
5 QUARRY LAKES PARKWAY, PHASES 1-4
36 Fremont
Union City
7 QUARRY LAKES PARKWAY, PHASES 1 & 2
8 Onsite Options Explored (Old Alameda Creek)
Union City
Union City
Fremont
9 Onsite Options Explored (Old Alameda Creek)
Union City
Fremont
(ACWD)
10 Onsite Options Evaluation - Conclusion
✓Original OAC Concept
▪City of Fremont cannot support onsite mitigation west of OAC.
▪Area east of OAC inadequate to provide wetland mitigation ✓ACWD property
▪ACWD will not allow the use of the land for Options 5A/5B without market rate acquisition cost, making this site
infeasible
✓Union City OAC property
▪Only limited opportunity for riparian mitigation and little to no opportunity for wetland mitigation
✓Offsite Mitigation Necessary for QLP 1-4
▪Need for much larger wetland and riparian mitigation options 11 Quarry Lakes Parkway, Phase 1- 4 Overview
12 Existing Wetlands & Line M Open Channel Alignment
13 Quarry Lakes Parkway, Phases 1-4 Drainage Design
14 QLP, Phase 1 - Line M Open Channel Realignment
15 QLP 1- 4 Impact on Waters, Wetlands, Riparian
16 QLP Impact on Waters, Wetlands, Riparian
Permanent Impacts to Waters and Wetlands and Potential Mitigation, Quarry Lakes Parkway Jurisdictional Feature QLP, Phases
Permanent Impacts
Temporary
Impacts
Acres Linear Feet Acres
Wetlands (Waters of the U.S. and State)
Old Alameda Creek 2 0.010 0.136
Other isolated wetlands 3 0.014
Basin 2C 1 1.066
Total Wetlands 1.090 0.136
Waters
Old Alameda Creek 2 See riparian
Line M Channel (not restored onsite) 1 0.000 709
New Basin (Pipe Connection to Line M)
(Waters of the State Only) 1 & 3 2.732
Total Waters 2.732 709 0.000
Riparian
Old Alameda Creek 2 0.279 100 0.114
17 QLP Proposed Mitigation
Permanent Impacts to Waters and Wetlands and Potential Mitigation, Quarry Lakes Parkway Jurisdictional Feature Phase
Permanent
Impacts Proposed
Mitigation Ratios
Temporary
Impacts Proposed
Mitigation Ratio
Mitigation
Requirement
Acres Linear
Feet Acres Acres
Linear
Feet
Wetlands (Waters of the U.S. and State)
Old Alameda Creek 2 0.010 3.0 0.136 0.1 0.044
Other isolated wetlands 3 0.014 3.0 0.1 0.042 `
Basin 2C 1 1.066 3.0 0.1 3.198
Total Wetlands 1.090 0.136 3.284
Waters
Old Alameda Creek 2 See riparian
Line M Channel 1 0.000 709 2.0 0.1 0.000 1,418
New Basin (Pipe to Line M)
(Waters of the State Only) 1 & 3 2.732 1.0 0.1 2.732
Total Waters 2.732 709 0.000 2.732 1,418
Riparian
Old Alameda Creek 2 0.279 100 3.0 0.114 0.1 0.848 300
18 Impact and Mitigation Timing
• Construction in 2026
• Planting in 2026 - 2027
• Benefits; 3.3 ac wetlands, 3.3 ac riparian, 1,400 LF channel Offsite Mitigation
• Construction 2027 – 2028
• Perm Impacts: 0.010 ac wetlands; 0.257 ac riparian; 100 LF Old Alameda Creek Construction Impact
• Construction Mid-2027 - 2029
• Perm Impacts: 1.08 ac wetlands; 709 LF channel, 2.7 ac basin Basin 2C/New Basin Construction Impact
19 Offsite Mitigation Location
Proposed locations for QLP Mitigation:
1) Manning Ranch (part of Eagle Ridge
Ranch)
2) Livermore Valley Preserve
20 Offsite Mitigation Location
Olberding has
successfully:
✓Created wetlands
✓Restored Creek
Channels
✓Created/enhanced
riparian habitat
✓Created CTS breeding
habitat
✓Increased CRLF
population
21 Offsite Mitigation: Manning Ranch
22 Offsite Mitigation: Manning Ranch
Existing Condition
23 Offsite Mitigation: Example Created Wetland Habitat
24 Offsite Mitigation: Examples of Channel Habitat
25 Offsite Mitigation: Livermore Valley Preserve
26 Offsite Mitigation: Livermore Valley Preserve
27 Offsite Mitigation: Livermore Valley Preserve
28 Quarry Lakes Parkway- Off Site Development Process
• Mitigation
Amounts
and
Location
• Spring
2025
Agency
Concurrence
Summer
2025
Conceptual
Mitigation
Plan
Fall 2025
Draft
Mitigation
Plan Winter 2025
Final
Mitigation
Plan
Spring/
Summer
2026
Mitigation
Construction
Start
29 Proposed Mitigation Approach-Quarry Lakes Parkway
30 Proposed Mitigation Approach-Quarry Lakes Parkway
Next Steps for Project Funding (Alameda CTC & MTC funds):
1) Guidance and Support by RWQCB & other agencies
2) Documentation (Letter) on Mitigation Approach to request funding 31 Discussion