800 Carlisle Way Well & Water Tank Project

800 Carlisle Way Well & Water Tank Project

The approximately 0.77-acre project site is located on the southeast corner of Lillian Avenue and Carlisle Way at 800 Carlisle Way (Assessor’s Parcel Number: 309-12-013) in the City of Sunnyvale. The project site is bound by Panama Park to the west, Carlisle Way to the north, and residential developments to the south and east. The project site is located in a residential neighborhood. The project site was formerly used as a groundwater extraction site for California Water Service (CalWater). The site consisted of a water well and associated chemical storage buildings, a Supervisory Control and Data Acquisition (SCADA) communication tower, booster pump, and 50,000-gallon water storage tank. In 2016, the water well on-site was decommissioned due to sanding issues and casing deterioration within the well. This water well, therefore, is no longer functional. The 50,000-gallon steel tank was removed in 2016 because the closure of the groundwater well on-site rendered the storage tank obsolete. The chemical storage buildings and booster pump – though inactive – remain onsite. The SCADA communication tower is still in use and is owned and maintained separately by Sprint Nextel on a portion of the project site. Due to projected future water demand, CalWater is proposing to reactivate the project site as a groundwater extraction site by constructing a replacement well that would be deeper than the current well, in addition to other associated improvements to accommodate future water demands. A deeper well would provide access to an additional long-term source of water for CalWater that would be used to partially offset a decrease in supply from other sources due to drought and climate change. The project would cap the existing groundwater well and demolish the existing chemical storage building, booster pump, electrical control panel, and connection to the existing water main on-site. After demolition, the project would install a replacement groundwater well at approximately 800 to 1,000 feet below ground surface and construct a new, approximately 56,000-gallon steel water storage tank (33 feet in diameter and 12 feet in height), three chemical storage enclosures, and several utility and right-of-way improvements. The project would also include a diesel-powered emergency generator. Construction of the replacement well could require continuous drilling for 24 hours a day for two consecutive weeks. Post construction, a 24-hour water production test (pumping approximately two million gallons of raw water from the replacement well) and, per Department of Health regulations, a separate draw of raw water for approximately 15 minutes (which would result in approximately 18,000 gallons) would be discharged into the storm drain system. No changes to the existing communication tower are proposed. Once operational, water would be pumped from the replacement groundwater well, treated, then stored in the new water storage tank. The treated water in the storage tank would then be distributed into the potable water system through the new 10-inch domestic water line on-site that would connect to the existing 10-inch potable water line in Carlisle Way.

Sunnyvale

Santa Clara

Citywide, Countywide, San Francisco Bay Area

California Air Resources Board (ARB), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Parks and Recreation, California Department of Transportation, District 4 (DOT), California Department of Water Resources (DWR), California Highway Patrol (CHP), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Drinking Water, District 17, State Water Resources Control Board, Division of Water Rights, State Water Resources Control Board, Divison of Financial Assistance, California Native American Heritage Commission (NAHC)

California Native American Heritage Commission (NAHC)

Water Facilities (New groundwater well and water tank)(Type Groundwater Well, MGD 1.44)

Site Plan, Use Permit

Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Energy, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mandatory Findings of Significance, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Schools/Universities, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire