800 Carlisle Way – Well and Water Tank Project
PLNG-2022-7041
Mary Jeyaprakash, Senior Planner
City Council, July 21, 2026
2City of Sunnyvale – 800 Carlisle Way – July 21, 2026
Project Site
3City of Sunnyvale – 800 Carlisle Way – July 21, 2026
Proposed Site Plan
Water Storage Tank
Groundwater Well
Chemical Cabinets
Pump Station
Emergency Generator
Distance from old well to
proposed well is ~ 80 feet
4City of Sunnyvale – 800 Carlisle Way – July 21, 2026
Site Elevations
Elevation from Carlisle Way
5City of Sunnyvale – 800 Carlisle Way – July 21, 2026
Site Elevations
Elevation from Panama Park
6City of Sunnyvale – 800 Carlisle Way – July 21, 2026
Site Elevations
Elevation facing North
7City of Sunnyvale – 800 Carlisle Way – July 21, 2026
Site Elevations
Elevation facing West
8City of Sunnyvale – 800 Carlisle Way – July 21, 2026
CEQA Studies
• Hydrology and Water Quality
• Subsidence and Sustainable
Groundwater Management
• Land Use
• Noise and Vibration
• Project specific studies and
modeling
• Transportation
• Utilities and Service Systems
• Aesthetics
• Air Quality
• Biological Resources
• Cultural Resources
• Geology and Soils
• Geotechnical Feasibility Study
• Greenhouse Gas Emissions
• Hazards and Hazardous Materials
• Tribal Cultural Resources
9City of Sunnyvale – 800 Carlisle Way – July 21, 2026
CEQA Significant Impact
• Significant and Unavoidable Impact:
Drilling activities exceed noise limits
•Construction 24/7 (outside of allowed construction
hours)
•Exceed nighttime limit (50 dBA) at two adjacent
residences
10City of Sunnyvale – 800 Carlisle Way – July 21, 2026
Significant Unavoidable Noise Impact
62.8 dBA
46.7 dBA
Proposed
Well
65.7 dBA
49.2 dBA
65.8 dBA
49.8 dBA
62.8 dBA
48.7 dBA
65.9 dBA
47.3 dBA
65.6 dBA
48.5 dBA74.1 dBA
57.7 dBA
68.7 dBA
52.2 dBA
79.8 dBA
57.5 dBA
• Legend:
– Noise Measurement Locations
Noise Levels (in Blue) – Before
Mitigation
Noise Levels (in Green) – After
Mitigation
Noise Levels (in Green and Underlined)
– Exceed Nighttime Standard
N
Drilling Operation - Noise Modeling Results:
11City of Sunnyvale – 800 Carlisle Way – July 21, 2026
Neighborhood Key Concerns
• Noise and vibration
• Soil and groundwater stability and sustainability
• Water tank massing
• Glare from construction lighting
• Safety management
12City of Sunnyvale – 800 Carlisle Way – July 21, 2026
Planning Commission Hearing (March 9, 2026)
• Additional hotel vouchers
• Relocated emergency generator
• Noise and Vibration monitoring
• Alternate site analysis
• Alternate equipment analysis
• Consistency in tree removal
13City of Sunnyvale – 800 Carlisle Way – July 21, 2026
Mitigation Measures
• Drilling Noise and Vibration Control
CEQA mitigations
•Noise monitoring
•Temporary sound barriers
•Hotel vouchers to two immediate neighbors
Non-CEQA control measures
•Hotel vouchers to 8 other neighbors
•Noise and vibration monitoring and reporting
14City of Sunnyvale – 800 Carlisle Way – July 21, 2026
Overriding Considerations and Project Benefits
• No feasible alternative
• Project benefits:
• Serves 2,000 local connections (~7,800 residents)
• Enables reliable water supply
• Provides emergency potable water
• Consistent with General Plan goals:
•Supportive utilities and adequate water supply
•Conforms to mass/scale of neighborhood (17-foot tank height) 15City of Sunnyvale – 800 Carlisle Way – July 21, 2026
Environmental Impact Report:
1. Adopt a Resolution to certify the EIR subject to the Recommended Findings, Statement of Overriding Considerations, and Mitigation Monitoring and Reporting Program.
2. Do not certify the EIR and require additional environmental analysis.
Use Permit:
3. Approve the Use Permit subject to the Recommended Findings and Recommended Conditions of Approval.
4. Approve the Use Permit subject to the Recommended Findings and Recommended Conditions of Approval with modifications.
5. Do not make the required Findings and require changes.
Alternatives
16City of Sunnyvale – 800 Carlisle Way – July 21, 2026
Staff Recommendation
Forward Recommendations to the City Council to take the following actions:
Alternative 1: Adopt a Resolution to certify the EIR subject to the Recommended Findings, Statement of Overriding Considerations, and Mitigation Monitoring and Reporting Program; and
Alternative 3: Approve the Use Permit subject to the
Recommended Findings and Recommended Conditions of
Approval.