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Council approves Cal Water Carlisle well after months of neighborhood objections and added conditions
Summary
After extended public testimony and council debate, Sunnyvale approved Cal Water's Carlisle well EIR and use permit with conditions requiring monitoring, daily public reports, hotel vouchers for impacted neighbors, independent verification of noise/vibration data, and tree protection review.
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The City Council on July 21 certified the environmental impact report and approved Cal Water's use permit for a new groundwater well and tank at the Carlisle site, but only after adding numerous conditions proposed during an extended public hearing and council interchange.
Cal Water representatives said the new well replaces an aging source, improves local water reliability and emergency firefighting capacity and that drilling has successfully been used in other parts of their service area. "Cal Water has been in service for 100 years," the applicant said, emphasizing system resilience and mutual‑aid benefits. Staff's CEQA analysis identified potential significant nighttime noise impacts at two adjacent homes during 24/7 drilling; mitigation included temporary sound barriers, continuous noise and vibration monitoring, and hotel vouchers for impacted residents. A motion to approve the EIR and use permit passed 6‑0 with one abstention; council added conditions to require daily public reporting of monitoring data, public access to the raw vibration/noise measurements, independent verification of monitoring, a clarified corrective‑action protocol for exceedances, case‑by‑case hotel accommodations beyond the initially listed homes, and a final review of tree protection before any work begins.
Neighbors and experts pressed for baseline condition surveys, independent monitors empowered to pause work, explicit thresholds for when drilling must stop, and stronger tree‑protection assurances. Several residents described health or sleep impacts from diesel generators and expressed concern that a temporary sound wall design could require foundations that conflict with protected tree root zones. Cal Water and the city agreed to refine sound wall design during the permit stage and to develop a clear communications protocol for residents (posted contact, 24/7 on‑call project contacts and daily monitoring summaries). The council vote directs staff and the applicant to finalize implementation details consistent with the newly added conditions.

