Sunnyvale City Council
August 27, 2024

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-54 Intuitive North Site Modification Project Environmental Checklist

4.9.1 Discussion
No substantial change in the environmental and regulatory settings related to hazards and hazardous materials, described in LSAP Draft EIR Section 3.3, “Hazards and Human Health,” has occurred since certification of the 2016 LSAP EIR and the 2021 LSAP Update SEIR.

A Phase I and Limited Phase II Environmental Site Assessment (ESA) were prepared for the North Site (Iris Environmental 2014). The Phase I identified two Recognized Environmental Conditions (REC) at 945 Kifer Road. One REC was related to historical agricultural practices on the site and the second related to soil vapor from contaminated groundwater. A follow-up subsurface environmental investigation was conducted to assess the potential for hazardous soil, soil vapor, and groundwater. Isolated issues were identified with slightly elevated concentrations of arsenic and nickel in soil, and tetrachloroethene and benzene in soil vapor. The 2019 report concluded the minor soil impacts could be managed through targeted removal during site grading and the minor soil vapor impacts could be managed through engineering and administrative controls already being implemented on neighboring sites with similar issues.

A Phase I and Phase II ESA, Vapor Intrusion Assessment Report, and Soils Management Plan have been prepared for the proposed Extension Site at 2900 Semiconductor Drive (Farallon Consulting 2021; Langan Treadwell Rollo 2014).

Initial site assessment of soil and groundwater was conducted in 1982 and samples indicated presence of VOCs in the soil and groundwater. Groundwater monitoring is conducted annually at 2900 Semiconductor Drive to assess VOCs and evaluate the effectiveness of the remediation systems. Cleanup measures have been implemented at 2900 Semiconductor Drive since the mid 1980’s and include source removal, soil excavation, groundwater extraction and treatment, soil vapor extraction, and ozone sparging. The Vapor Intrusion Report prepared in 2021 identified vapors on the Extension Site at concentrations that exceed potentially applicable vapor intrusion screening levels, while the Soil Management Plan includes procedures to manage soil, soil vapor, and groundwater during project construction including soil excavation, stockpile management, and soil import criteria. a) Create a significant hazard to the public or the environment through the routine transport, use, or disposal of hazardous materials?
North Site
New development, such as the proposed project, or redevelopment that involves construction, demolition, and landscaping activities would require the transport, use, and disposal of various building materials, including some hazardous materials (e.g., gasoline, fuels, demolition materials, asphalt, lubricants, toxic solvents, pesticides, and herbicides.) As stated in the 2016 LSAP EIR, the transport, use, and disposal of such materials could pose a potential hazard to the public and the environment if not properly transported, used, stored, and disposed. This issue was addressed in Impact 3.3.1 of the certified 2016 LSAP EIR. During construction activities, all work would be conducted in accordance with the California Occupational Safety and Health Agency (Cal/OSHA) training and worker protection rules and regulations. Use, storage, and transport of hazardous materials for buildout of the LSAP would not pose a significant risk to the environment due to compliance with applicable state and federal regulations. ISI Project . The LSAP Update SEIR also stated that implementation of the LSAP Update and ISI Project would not result in a new significant effect and the impact is not substantially more severe than the impact identified in the 2016 LSAP EIR, concluding that the impact to the public and the environment from exposure to these hazardous materials and other hazards during construction would be less than significant.

The LSAP Update SEIR determined that construction activities associated with the ISI Project on the North Site would be required to comply with all federal, State, and local regulations related to the transport, use, disposal, and accidental release of hazardous materials during construction. The LSAP Update SEIR determined that hazardous materials from operation of the ISI Project would be similar to other existing ISI sites in the LSAP. All hazardous wastes used during operation would be required to comply with all applicable local, state, and federal regulations. ISI Project operations that use hazardous materials are required to obtain permits and comply with appropriate regulatory agency standards designed to avoid hazardous waste releases. These include but are not limited to the federal Resource Conservation and Recovery Act, which includes requirements for hazardous solid waste management; the California Department of Toxic Substances Control Environmental Health Standards for the Management of Hazardous Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-55 Waste (California Code of Regulations Title 22, Division 4.5), which include standards for generators and transporters of hazardous waste; and the California Division of Occupational Health and Safety, which includes standards for workplace health and safety. The City of Sunnyvale Department of Public Safety is responsible for consolidating, coordinating, and making consistent the administrative requirements, permits, inspections, and enforcement activities of state standards regarding the transportation, use, and disposal of hazardous materials in the LSAP area.

Updates to the North Site would include refinements to the design of the North Site building to ensure consistency with the building on the South Site, such as adding an internal courtyard, changing vision and spandrel glazing in similar locations, extending the trellis element, and relocating mechanical equipment to the rooftop with screening structures. The portion of the project on the North Site would not include any increases in the number of employees, intensity, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR. The proposed modifications include a reduction in square footage of the north building from approximately 364,000 square feet to approximately 358,000 square feet. The parking structure proposed for the Extension Site would involve approximately the same amount of hazardous materials as the previously proposed underground parking garage on the North Site. The project does not propose any changes to the South Site.

Therefore, the 2,200 pounds of hazardous waste per month assumed to be generated by the ISI Project in the LSAP Update SEIR would not increase as part of the project. Development as part of the project for the North Site would be subject to the Soil Management Plan prepared for the North Site Therefore, with continued compliance with all federal, state, and local regulations related to the transport, use, and disposal of hazardous materials, construction impacts from the project would remain less than significant. The portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to a hazards than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to hazards than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to hazards the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Extension Site
The project would include construction, demolition, and tree removal/landscaping activities for the proposed parking garage that could result in the transport, use, and disposal of hazardous materials such as gasoline, fuels, demolition materials, asphalt, and lubricants on the Extension Site. The project would not include any increases in the number of employees, intensity, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit .

Substantial hazardous material use would not be associated with the proposed parking garage. Small amounts of hazardous materials could be used for cleaning or landscaping. Development as part of the Extension Site would be subject to the Soil Management Plan prepared for the 2900 Semiconductor Drive, which includes the Extension Site (Langan Treadwell Rollo 2014). The Soil Management Plan includes procedures to manage soil, soil vapor, and groundwater during project construction. Construction measures include coverage of stockpiles, testing imported soil, and stopping work if unanticipated conditions (i.e., potential contamination) is encountered on the site.

Work would be stopped within a minimum of 25 feet from the find and the encounter would be covered with plastic material. In accordance with the Soil Management Plan an “exclusion zone” would be created until the appropriate Environmental Safety Officer determines the actions to be completed prior to continuing work in the area. Offsite soil movement would be performed in accordance with applicable federal and state laws and regulations, including testing of the soils for waste determination and trucks loaded with at least 1 foot of freeboard. Additionally, site management requirements for 2900 Semiconductor Drive set by the Regional Water Quality Control Board (RWQCB) to reduce exposure to contaminants include no excavation of contaminated soils or groundwater extraction without agency approval; extraction of groundwater only for site remediation permitted; and preparation of a Hazards and Safety Plan prior to any subsurface work. The Health and Safety Plan must meet the performance standards set by the US Occupational Health and Safety Administration, the California Division of Occupational Health and Safety, and the County of Santa Clara Occupational Safety and Environmental Compliance Division . These include but are not limited to having requirements and strategies for the proper storage, transport, and disposal of hazardous waste; Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-56 Intuitive North Site Modification Project Environmental Checklist having requirements and strategies to reduce the exposure of community members to hazardous waste to the greatest extent possible; and having requirements and strategies for responding timely to accidents involving hazardous waste.

Compliance with all federal, State, and local regulations related to the transport, use, disposal, and accidental release of hazardous materials during construction of the parking garage would minimize potential impacts. Therefore, with continued compliance with all applicable regulations related to the transport, use, and disposal of hazardous materials, operational impacts from the project would remain less than significant. The portion of the project on the East Site would not result in new significant impacts or substantially more severe impacts related to a hazards than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to hazards than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to hazards the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be su bstantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.
b) Create a significant hazard to the public or the environment through reasonably foreseeable upset and/or accident conditions involving the release of hazardous materials into the environment?
North Site
The LSAP Update SEIR stated that the ISI Project would generate less than 2,200 pounds of hazardous waste per month and is considered a small quality generator as defined by the Department of Toxic Substances Control. The LSAP Update SEIR found that construction of the ISI Project would occur in compliance with local, State, and federal regulations, which would minimize but not eliminate the potential for upset or accident conditions. All hazardous wastes would be disposed of according to applicable laws and regulations. The transport, storage, and use of hazardous materials are required to follow local, state, and federal regulations during project construction and operation. These regulations are designed to prevent accidental releases and upsets of hazardous materials, making upset and accidents not reasonably foreseeable. Furthermore, the ISI Project would be required to obtain permits and comply with appropriate regulatory agency standards designed to prevent accidental hazardous waste releases. As the LSAP is implemented, it is anticipated there would not be a substantial increase in the number of facilities or types of activities involving the use of hazardous materials compared to existing conditions, and the LSAP does not designate land for new heavy industrial uses.

Updates to the North Site would include refinements to the design of the North Site building to ensure consistency with the building on the South Site. The project would not include any increases in the number of employees, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR. Therefore, the 2,200 pounds of hazardous waste per month assumed to be generated by the ISI Project in the LSAP Update SEIR would not increase as part of the project. Project activities are subject to state and regional regulations related to the handling, storage, and transportation of hazardous materials that are designed to prevent accidental releases. In addition, the portion of the project on the North Site would be subject to and comply with all federal, state, and local laws related to the disposal of hazardous materials in the City of Sunnyvale. The portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to a hazards than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to hazards than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to hazards the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-57 the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Extension Site
The project would include construction, demolition, and tree removal/landscaping activities for the proposed parking garage that could result in the transport, use, and disposal of hazardous materials such as gasoline, fuels, demolition materials, asphalt, lubricants, toxic solvents, pesticides, and herbicides. The project would be subject to and comply with all federal, state, and local laws related to the disposal of hazardous materials in the City of Santa Clara. Project construction would be subject to the Soil Management Plan (SMP) prepared for 2900 Semiconductor Drive and site management requirements for 2900 Semiconductor Drive, which includes procedures to manage soil, soil vapor, and groundwater during project construction (Langan Treadwell Rollo 2014). Construction measures from the SMP include coverage of stockpiles, preventing erosion form stockpiles, and covering or wetting soil when it is being moved around the site. Offsite soil movement would be performed in accordance with applicable federal and state laws and regulations, including testing of the soils for waste determination and trucks loaded with at least 1 foot of freeboard. Compliance with existing regulations and the SMP would minimize risk of accidental upset or accidental release of hazardous materials into the environment to a level that is less than significant. No substantial hazardous material use would be associated with the operation of the proposed parking garage. The portion of the project on the East Site would not result in new significant impacts or substantially more severe impacts related to a hazards than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to hazards than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to hazards the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid. c) Emit hazardous emissions or handle hazardous or acutely hazardous materials, substances, or waste within one-quarter mile of an existing or proposed school? The project would result in demolition, construction, and landscaping activities that may result in temporary and limited handling of hazardous materials. However, no schools are located within ¼ mile distance of the project site and would not be impacted by project activities. The project would not result in new significant impacts or substantially more severe impacts related to a hazards near a school than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to hazards near a school than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to hazards the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid. d) Be located on a site which is included on a list of hazardous materials sites compiled pursuant to Government Code §65962.5 and, as a result, would it create a significant hazard to the public or the environment?
North Site
As discussed in the LSAP Update SEIR, the ISI Project is listed on the lists of sites comprising the Cortese list, and a Phase I ESA and Phase II subsurface investigation were completed for the ISI Project. No records of historical hazardous materials use have been identified on the North Site. However, the investigation prepared on the North Site included evaluation of potential human health risks from contaminated soil for construction workers, vapor intrusion for future building occupants, and potential VOCs in groundwater. Results of the investigation found all onsite soil gas sampling results were below vapor intrusion environmental screening levels for commercial and Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-58 Intuitive North Site Modification Project Environmental Checklist industrial uses. Similarly, groundwater levels were below respective environmental screening levels, but with barium, chromium, lead, and zinc above their discharge limits. At 945 Kifer Road, the arsenic exceeded applicable screening criteria for commercial and industrial land use in one soil sample and groundwater samples indicate that total concentrations of five distinct metals are greater than the discharge limit requirements set forth by the RWQCB.

Results of the Phase II investigation recommend soil vapor, groundwater, and soil remedial measures at the 945 and 955 Kifer Road parcels.

As prescribed in the Phase II ESA, the shallow soils exceeding applicable screening criteria would be excavated and removed and soils would be sampled during site grading and development to confirm contaminants have been removed. A report documenting the removal activities would also be submitted to the San Francisco RWQCB following completion of construction activity. All work involving direct contact with soil would be conducted in accordance with Cal/OSHA standards. To address metals in the groundwater an on-site treatment system would be designed to remove suspended metals and would be incorporated into the dewatering plan for the North Site in coordination with the City of Sunnyvale and engineering subcontractors to accommodate the anticipated dewatering system. Hydraulic modeling performed for the potential effects of dewatering during construction on the North Site indicated that dewatering activities were not expected to cause VOC-impacted groundwater to migrate into the underground garage analyzed in the LSAP Update SEIR if slurry walls are constructed. The North Site project no longer includes an underground parking garage and VOC-impacted groundwater would no longer be a concern for the project.

No changes to the regulatory setting, the condition of the North Site, or the presence of hazardous materials on the North Site have occurred since adoption of the LSAP Update. Proposed changes to development the North Site would include removal of the underground parking garage and other minor aesthetic changes. Therefore, the portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to a hazards on the Cortese list than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to hazards on the Cortese list than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to hazards the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid. This impact would remain less than significant with implementation of adopted LSAP Update SEIR Mitigation Measure 3.8-1.

Extension Site
The Extension Site is listed on the lists of sites comprising the Cortese list. There is a historical cleanup site at the Extension Site under the oversight of the San Fransisco RWQBC (Case No. 43S0084). The Extension Site (2900 Semiconductor Drive, Santa Clara) was assessed for potential for contaminated resources from 1982 to 1991. VOCs were detected in the soil and groundwater. While VOC concentrations in shallow groundwater exceed standards, the deeper drinking water has not been affected by contamination. Various remediation measures have been implemented on the Extension Site including source, removal, soil excavation, groundwater extraction and treatment, chemical oxidation, soil vapor extraction, and ozone sparging since the mid-1980s (Langan Treadwell Rollo 2014). Residual VOCs are present in the groundwater, but have been significantly reduced. Originally 12 contaminated soil source units were identified. Of those 12 soil source units, 11 have been identified as requiring no further action for office and commercial uses including soils under the Extension Site. The Leak L5 Area is the last remaining soil source area requiring closure. Oxidation treatments have been ongoing at the Leak L5 area to reduce VOC concentrations and no further action has been determined by the RWQBC for the Leak L5 Area. However, there are several land use restrictions and covenants for the Extension Site within Santa Clara.

Site work required to construct the parking garage would follow all applicable state and federal laws, which would prevent the release of hazardous materials and exacerbation of existing contamination. Additionally, the Extension Site requires groundwater remediation and annual groundwater monitoring and reporting for the foreseeable future.

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-59 The Extension Site is located on land that was formerly part of the Monolithic Memories site, a former semiconductor manufacturing facility located in Sunnyvale and Santa Clara. The Extension Site is located within Operable Unit 1, Subunit 1 of the former Monolithic Memories Site. Operable Unit 1, Subunit 1 is an area that occupies approximately 60 acres and contains over 20 buildings used for administrative offices, laboratories, and semiconductor manufacturing. Operable Unit 1, Subunit 1 also includes the former United Technologies Corporation (UTC) facility.

Virgin solvents and acids used in semiconductor manufacturing processes were, or are, stored in aboveground tanks and storage drums on the site. Waste solvents have been stored in underground and aboveground tanks, and acid wastes have been treated in underground and aboveground tanks or underground neutralization sumps on the site.

A Vapor Intrusion Report and Soil Management Plan were prepared for the Extension Site. The Vapor Intrusion Report identified VOC on the Extension Site at concentrations that exceed potentially applicable vapor intrusion screening levels (Farallon Consulting 2021). Sampling indicated that tetrachloroethene is present in indoor air at concentrations below the applicable screening levels at existing buildings located at 2900 Semiconductor Drive and east of the project site. The Vapor Intrusion Report concluded that although vapor intrusion is occurring on the site VOCs are no accumulating at levels that would propose a risk to future workers, but periodic indoor air monitoring is recommended. The project would include a new parking garage where employees would not have long term exposure to vapor intrusion and that is open to outdoor airflow. The Extension Site was analyzed for potential risks from hazardous materials, specifically vapors, on the site and no recommendations were included in the Vapor Intrusion Report. This impact would be less than significant. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to a hazards on the Cortese list than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to hazards on the Cortese list than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to hazards the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid. e) For a project located within an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project result in a safety hazard for people residing or working in the project area? The LSAP Update SEIR stated that the LSAP area is outside the Moffett Airfield’s influence area and safety zones, and there are no private airstrips near the LSAP area. No new airports have been developed near the project area and 2900 Semiconductor Drive is outside Moffett Airfield’s influence area and safety zones. No new significant impacts or substantially more severe impacts related to proximity to an airport would occur. Therefore, the findings of the certified LSAP EIR and LSAP Update SEIR remain valid, and no impact would occur. f) Impair implementation of or physically interfere with an adopted emergency response plan or emergency evacuation plan?
As discussed in the LSAP Update SEIR, the ISI Project would involve construction truck traffic and potential lane/shoulder closures in work zones that could interfere with or slow emergency vehicle access and evacuation.

North Site
As indicated in the LSAP Update SEIR, construction activities associated with the ISI Project would include demolition activities, excavation, tree removal and relocation of soil on the site, backfilling and compaction of soils. These activities would occur on the North Site and would not involve work in adjacent roadways. However, providing a deceleration and acceleration lane along Central Expressway and updates to the geometry of the signalized intersection at 945 Kifer Road would involve work in the roadway that may result in the need for temporary traffic lane narrowing or closures, which could affect emergency response or evacuation routes. This was identified as a potentially significant impact in the LSAP Update SEIR that would be mitigated to less than significant through implementation of Mitigation Measure Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-60 Intuitive North Site Modification Project Environmental Checklist MM 3.3.5, which requires the applicant to develop a construction traffic control plan if project activities could impair or inhibit emergency response or evacuation. This mitigation measures also would apply to the project on the North Site.

Additionally, the project on the North Site would adhere to City of Sunnyvale Fire Code Section 16.52.311.1.1, which requires that access be maintained for fire and emergency responders. The geometry of the signalized intersection at 945 Kifer Road would be changed to accommodate the proposed private parking garage on the Extension Site. As shown below in Figure 4-1, the intersection of Kifer Road and the project site would be designed to provide gated access to the site and prevent public through traffic from Central Expressway to Kifer Road. Changes to the intersection would be completed in accordance with City standards and in coordination with the public works department. The Central Expressway deceleration and acceleration lane improvements would be completed in accordance with Santa Clara County Department of Roads and Airports standards and in coordination with the City of Sunnyvale and City of Santa Clara public works departments. With adherence to Mitigation Measure 3.3.5, and the Sunnyvale Municipal Code, proposed changes to the North Site, including the proposed access changes would not interfere with emergency response or evacuation plans. The portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to an emergency response plan than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to an emergency response plan than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to an emergency response plan the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Extension Site
The project would include a new parking structure on the Extension Site. Construction of the parking garage would include removal of the existing surface parking lot, excavation, and relocation of soil on the site, backfilling and compaction of soils. These activities would occur on the Extension Site and would not involve work or construction staging in adjacent roadways, with the exception of the Central Expressway deceleration and acceleration lanes.

However, the project would be subject to implementation of Mitigation Measure MM 3.3.5, which requires the applicant to develop a construction traffic control plan if project activities could impair or inhibit emergency response or evacuation. Additionally, the project would adhere to City of Santa Clara City Code Section 15.60.300, which requires emergency vehicle access for all construction sites. The project would not alter emergency evacuation pathways or result in inadequate emergency response or evacuation times. This impact would be less than significant. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to an emergency response plan than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to an emergency response plan than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to an emergency response plan the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid. opt. g) Expose people or structures, either directly or indirectly, to a significant risk of loss, injury, or death involving wildland fires?
As identified on LSAP Draft EIR page 3.3-9, there are no Fire Hazard Severity Zones or state responsibility areas or Very High Fire Hazard Severity Zones for local responsibility areas within or adjacent to Sunnyvale. No changes to the location of the portion of the project on the North Site have occurred and no changes to the risks from wildfires has occurred since approval of the LSAP Update. Similarly, the Extension Site is not in any fire hazard zone.

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-61

Source: Hellmuth, Obata and Kassabaum, Inc. 2024.

Figure 4-1 Overall Site Plan
Attachment 13

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-63 The project would not result in new significant impacts or substantially more severe impacts related to a wildland fire than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to a wildland fire than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to wildland fires the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Mitigation Measures from LSAP Update EIR
Mitigation Measures 3.3.3 and 3.3.5 were adopted as part of the LSAP. Mitigation Measure 3.3.3 was replaced with LSAP Update SEIR Mitigation Measure 3.8-1 that requires preparation of a Phase I ESA and, if deemed necessary by the Phase I ESA, the preparation of a Phase II ESA. As noted above, a Phase I and Phase II ESA have been completed for the North Site and Extension Site, and that requirement of Mitigation Measure 3.8-1 has been fulfilled. However, since the ESAs for the North Site identified arsenic in the soil and metals in the groundwater, the site will be remediated as required by the City for the use of the site to the satisfaction of the appropriate oversight agency prior to the initiation of construction activities, as discussed in the LSAP Update SEIR. The project would comply with all federal, state, and local regulations related to the transport, use, and disposal of hazardous materials, which would be monitored and enforced by the City of Sunnyvale for the North Site and City of Santa Clara on the Extension Site. The following adopted mitigation measures are referenced in the LSAP EIR and LSAP Update SEIR analysis and would continue to be applicable for the North Site if the project was approved. ISI has agreed to implement these mitigation measures on the Extension Site in a letter dated December 20, 2023 and as included on the project site plans.

LSAP Update SEIR Mitigation Measure 3.8-1
The City shall require that a Phase I ESA is prepared and submitted with any application for new development or redevelopment within the adopted LSAP boundary. The Phase I ESA shall be prepared by a qualified professional registered in California and in accordance with ASTM E1527-13 (or the most current version at the time a development application is submitted for the project).

If determined necessary by the Phase I ESA, a Phase II ESA shall be conducted to determine the lateral and vertical extent of soil, groundwater, and/or soil vapor contamination, as recommended by the Phase I ESA.

The City shall not issue a building permit for a site where contamination has been identified until remediation or effective site management controls appropriate for the use of the site have been completed, consistent with applicable regulations and to the satisfaction of the City of Sunnyvale, Department of Toxic Substances Control, or San Francisco Bay RWQCB (as appropriate) before initiation of construction activities. Deed restrictions, if appropriate, shall be recorded. If temporary dewatering is required during construction or if permanent dewatering is required for subterranean features, the City shall not issue an improvement permit or building permit until documentation has been provided to the City that the San Francisco Bay RWQCB has approved the discharge to the sewer. Discharge of any groundwater removed from a construction site within the adopted LSAP and to the El Camino Storm Drain Channel, Calabazas Creek, or storm drain shall be subject to Water Pollution Control Permit requirements.

If the Phase I ESA determines there are no RECs, no further action is required. However, the City shall ensure any grading or improvement plan or building permit includes a statement if hazardous materials contamination is discovered or suspected during construction activity, all work shall stop immediately until a qualified professional has determined an appropriate course of action.

Mitigation Measure MM 3.3.5
Prior to issuance of a permit for a specific development project or before approving a City- initiated roadway improvement identified in the LSAP, the City shall determine whether project construction activities have the potential to affect traffic conditions on roadways as a result of construction of the development project or roadway improvement(s). If there is the potential the activities could impair or inhibit emergency response or evacuation, a Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-64 Intuitive North Site Modification Project Environmental Checklist Construction Traffic Control Plan shall be prepared for City review and approval. The plan shall include, but not be limited to, schedule of construction and anticipated methods of handling traffic for each phase of construction to ensure the safe flow of traffic and adequate emergency access, including maintaining an open lane for vehicle travel at all times. All traffic control measures shall conform to City of Sunnyvale, Santa Clara County, and/or Caltrans standards, as applicable. The City shall ensure final approved plans for private development projects specify the requirement, as appropriate, to implement the construction traffic control plan.

Conclusion
No new circumstances or project changes related to hazards and hazardous materials have occurred that would result in new or substantially more severe hazards and hazardous materials impacts than were identified in the LSAP Update SEIR, nor is there new information of substantial importance that shows the project will have one or more significant effects not previously discussed or that the discussed effects would be substantially more severe or there would be newly feasible mitigation measures or alternatives or substantially different mitigation measures or alternatives that would substantially reduce impacts but that ISI declines to adopt . Therefore, the findings of the certified LSAP Update SEIR remain valid, and no additional analysis is required.

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-65

4.10 HYDROLOGY AND WATER QUALITY
Environmental Issue Area
Where Impact Was
Analyzed in the
LSAP Update Draft
and Final SEIR.

Do Project Changes
Involve New or
Substantially More
Severe Significant
Impacts?
Do Any New
Circumstances Involve
New or Substantially
More Severe
Significant Impacts?
Any New
Information of
Substantial
Importance?
Do Prior Environmental
Documents Mitigations
Address/Resolve
Impacts?

10. Hydrology and Water Quality. Would the project:
a) Violate any water quality standards or
waste discharge requirements or
otherwise substantially degrade surface
or groundwater quality?
Draft SEIR Impact

3.9-1
No No No NA, impact would
be less than
significant
b) Substantially decrease groundwater
supplies or interfere substantially with
groundwater recharge such that the
project may impede sustainable
groundwater management of the basin?
Draft SEIR Impact

3.9-2
No No No NA, impact would
be less than
significant.
c) Substantially alter the existing drainage
pattern of the site or area, including
through the alteration of the course of a
stream or river or through the addition of
impervious surfaces, in a manner which
would:

i) Result in substantial on- or offsite
erosion or siltation;
Draft SEIR Impact

3.9-1
No No No NA, impacts would
be less than
significant.
ii) Substantially increase the rate or
amount of surface runoff in a
manner which would result in
flooding on- or offsite;
Draft SEIR Impact

3.9-1
No No No NA, impacts would
be less than
significant.
iii) Create or contribute runoff water
which would exceed the capacity of
existing or planned stormwater
drainage systems or provide
substantial additional sources of
polluted runoff; or
Draft SEIR Impact

3.9-1
No No No NA, impact would
be less than
significant.
iv) Impede or redirect flood flows? Draft SEIR Impact

3.9-1
No No No NA, impacts would
be less than
significant
d) In flood hazard, tsunami, or seiche zones,
risk release of pollutants due to project
inundation?
Draft SEIR page

3.9-5
No No No NA, there would be
no impact.
e) Conflict with or obstruct implementation
of a water quality control plan or
sustainable groundwater management
plan?
Draft SEIR Impact

3.9-2
No No No NA, impacts would
be less than
significant.

Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-66 Intuitive North Site Modification Project Environmental Checklist

4.10.1 Discussion
No substantial change in the environmental and regulatory settings related to hydrology and water quality, described in LSAP Update SEIR Section 3.9, Hydrology and Water Quality, has occurred since certification of the LSAP Update SEIR. The SWRCB Construction General Permit was updated on September 8, 2022. However, the new Order does not include significant changes that would be defined as a changed condition under CEQA Guidelines Section 15162.

The City of Santa Clara City Code Chapter 13.20 contains water quality and drainage standards to control water pollution and waste discharges from all development in the City of Santa Clara. a) Violate any water quality standards or waste discharge requirements or otherwise substantially degrade surface or groundwater quality?
North Site
As addressed in the LSAP Update SEIR, construction activities associated with the development of the North Site would include grading, demolition, and vegetation removal which would disturb and expose soils to water erosion, potentially increasing the amount of silt and debris entering downstream waterways. Development of the ISI Project was determined in the LSAP Update SEIR to result in water quality impacts from developing the IISI Project. As stated in the LSAP Update SEIR construction and operation of the ISI Project would be subject to local, state, and regional regulations pertaining to water quality.

As described in the LSAP Update SEIR, Chapter 12.60 of the Sunnyvale Municipal Code provides regulations and gives legal effect to certain requirements of the NPDES permit issued to the City of Sunnyvale regarding municipal stormwater and urban runoff requirements. During construction of the ISI Project, the applicant must develop and implement a SWPPP and perform monitoring of discharges to stormwater systems to ensure compliance with s tate and local regulations. The ISI Project would also be required to implement BMPs for preventing erosion and movement of unwanted material into waters within or outside the site. Furthermore, the ISI Project would be required to include appropriate features to meet applicable Municipal Regional Stormwater Permit (MRP) Provision C.3 requirements and implement Low Impact Development (LID). Common LID strategies include treatment methods such as bio-retention basins and flow-through planters, green roofs, media filtration devices, and pervious surfaces.

A preliminary stormwater management plan was previously completed for the ISI Project (including the North Site) during preparation of the LSAP Update SEIR to document NDPES provision C.3 and identify BMPs to be incorporated into project design. The project would include refinements to the design of the North Site building to ensure consistency with the building on the South Site. The project would not include any increases in the number of employees, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR. The portion of the project on the North Site would therefore not result in an increase in impervious surface area compared to what was analyzed in the LSAP Update SEIR. The project would still include storm water control measures to reduce run off and decrease pollutant concentrations from site runoff.

Therefore, with continued compliance with existing requirements of Chapter 12.60 of the Sunnyvale Municipal Code and MRP Provision C.3 requirements, impacts to water quality from the portion of the project on the North Site would remain less than significant. Therefore, the portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to water quality than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to water quality than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to water quality the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-67 Extension Site
The portion of the project on the Extension Site would include removal of the existing surface parking lot, construction, and landscaping activities for the proposed parking garage. These activities would disturb and expose soils to water erosion, potentially increasing the amount of silt and debris entering downstream waterways. In addition, refueling and parking of construction equipment and other vehicles on the Extension Site during construction could result in oil, grease, or related pollutant leaks and spills that may discharge into storm drains.

Urban runoff typically consists of pollutants such as heavy metals, oil, grease, sediment, and other chemicals.

Development on the Extension Site would be subject to Chapter 13.20 of the Santa Clara Municipal Code, which provides regulations and supplements the requirements of the NPDES permit issued to the City of Santa Clara regarding municipal stormwater and urban runoff requirements. Chapter 13.20 makes it unlawful for anyone to discharge, or cause, allow, or permit to be discharged into any storm drain, storm sewer, or natural outlet or channel any waste, including, but not limited to, sewage, industrial wastes, petroleum products, coal tar, or any refuse substance arising from the manufacture of gas from coal or petroleum, chemicals, detergents, solvents, paints, contaminated water, or chlorinated swimming pool water, pesticides, herbicides, fertilizers, or other process wastewater. During construction of the parking garage, the applicant, through individual coverage under the State’s General Construction NPDES permit, would be required to develop and implement a SWPPP and perform monitoring of discharges to stormwater systems to ensure compliance with state and local regulations. The project would also be required to implement BMPs for preventing erosion and movement of unwanted material into waters within or outside the site. Furthermore, the project would be required to include appropriate features to meet applicable regional MRP Provision C.3 requirements and implement LID. Common LID strategies that would be appropriate for the parking garage would be similar to the ones described above for the North Site building.

The project site is currently a paved parking lot. The proposed parking garage would replace the parking lot and would not result in an increase in impervious surface cover over existing conditions at the Extension Site. However, the project would still implement stormwater control measures to reduce run off and decrease pollutant concentrations from site runoff. These would include but not be limited to diverting drainage from soil stockpiles, installing silt fencing/straw bale filter barriers on the down gradient toes of stockpile slopes, placing soil stockpiles on top of at least one layer of 10-mil polyethylene sheeting (or equivalent) such as Visqueen to prevent contact with the ground surface, and covering stockpiles with a tarp or Visqueen when soil stockpiles are not being handled (Langan Treadwell Rollo 2014).

Compliance with existing requirements of Chapter 13.20 of the Santa Clara Municipal Code and MRP Provision C.3 requirements would minimize impacts to water quality. Surface water quality impacts associated with development of the Extension Site would remain less than significant. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to water quality than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to water quality than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to water quality the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid. b) Substantially decrease groundwater supplies or interfere substantially with groundwater recharge such that the project may impede sustainable groundwater management of the basin?
North Site
The project would include refinements to the design of the North Site building to ensure consistency with the building on the South Site. The project would not include any increases in the number of employees, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR. The project would have little or no effect on groundwater recharge because the project would take place on a site that is largely built out and would therefore neither increase nor decrease the amount of permeable surfaces; in Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-68 Intuitive North Site Modification Project Environmental Checklist addition, the site is underlain by soils with low percolation rates, which results in a muted effect from changes in the amount of permeable surfaces. The project does not propose the installation of any wells on the project site that could alter groundwater flows. The project is not located within an area subject to a sustainable groundwater plan.

The North Site building would no longer include an underground parking garage. Excavation would be significantly reduced as compared to what was assumed in the LSAP Update SEIR. Therefore, the likelihood of encountering groundwater would be reduced. If groundwater is encountered during construction dewatering may be required.

Dewatering would be temporary, limited, and would not substantially deplete or interfere with recharge of groundwater at the local aquifer. The project would not increase the amount of impermeable surface from that approved in the LSAP Update SEIR, nor reduce the amount of permeable surface currently on the project site. The project would be required to adhere to SWPPP and MRP provisions and for the portion of the project in Sunnyvale, City of Sunnyvale regulations described in section a) above. In addition, the project would also not include the construction or operation of a well facility. Therefore, the portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to groundwater supplies than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to groundwater supplies than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to groundwater supplies the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Extension Site
The proposed Extension Site would have minimal impacts on groundwater recharge because the project site is currently a paved parking lot and has minor groundwater recharge through planting areas. The project would include removal of the parking lot, construction, and landscaping activities for the proposed parking garage. The project would increase groundwater recharge on the site by increasing landscaping on the site as opposed to what there is now on the existing paved lot. The project does not propose the installation of any wells in the project area that could alter groundwater flows. The project is not located within an area subject to a sustainable groundwater plan.

The proposed parking garage would be built above ground and the project does not involve constructing subsurface building features, except for foundation, footings, and utilities. Therefore, it is not likely that groundwater would be encountered during construction. If groundwater is encountered during construction, dewatering may be required.

However, dewatering would be temporary, limited, and would not substantially deplete or interfere with recharge of groundwater at the local aquifer. The project would not substantially increase the amount of impermeable surface on the project site. The project would be required to adhere to SWPPP and MRP provisions and, for the portion of the project in Santa Clara, City of Santa Clara regulations described in section a) above. Compliance with required provisions and regulations would prevent substantial pollution from percolating into the groundwater below the project site and would maintain the groundwater table. Impacts would remain less than significant. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to groundwater supplies than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to groundwater supplies than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to groundwater supplies the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-69 c) Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river or through the addition of impervious surfaces, in a manner which would:
i) Result in substantial on- or offsite erosion or siltation There are no streams or rivers on the project site. The LSAP Update SEIR concluded that stormwater runoff from the ISI Project site is not expected to increase and stated that the project would be required, per Section 12.60.160(a) of the City of Sunnyvale‘s Municipal Code, to demonstrate that it would not increase runoff over pre-project rates and durations. The LSAP Update SEIR concluded that compliance with the existing regulations contained in the City’s Municipal Code would reduce potential impacts associated with stormwater drainage to a level that is less than significant.

North Site
The project would include refinements to the design of the North Site building to ensure consistency with the building on the South Site. The project would not include any increases in the number of employees, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR. The project applicant completed a preliminary Stormwater Management Plan for the project that outlines the drainage areas and proposed treatment control measures, including the LID features discussed above, that would prevent an increase in the rate or amount of runoff, preventing substantial erosion, siltation, flooding, and polluted flows.

The portion of the project on the North Site is required to comply with Section 12.60.160 of the City of Sunnyvale Municipal Code. Project design plans include water quality control and drainage features for the North Site building.

Implementation of proposed water control and drainage features would ensure that drainage flows would not increase offsite. Therefore, the portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to erosion than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to erosion than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to erosion the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for t he ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Extension Site
The proposed project would include construction of a parking garage on the Extension Site in Santa Clara. The parking garage would replace an existing paved surface lot, trees and perimeter landscaping and would not significantly alter the drainage pattern on the Extension Site. The project applicant completed a preliminary Stormwater Management Plan for the project that outlines the drainage areas and proposed treatment control measures, including the LID features discussed above, that would prevent an increase in the rate or amount of runoff, preventing substantial erosion, siltation, flooding, and polluted flows. Existing conditions on the paved parking lot are mostly impervious. Therefore, the project would not significantly reduce pervious surfaces on the Extension Site, which is one way drainage patterns can be altered.

The project is required to comply with Section 13.20.020 of the City of Santa Clara City Code. Project design plans include water quality control and drainage features for the Extension Site. Implementation of proposed water control and drainage features would ensure that drainage flows would not increase offsite. Impacts would remain less than significant. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to erosion than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to erosion than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to erosion the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-70 Intuitive North Site Modification Project Environmental Checklist examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain. ii) Substantially increase the rate or amount of surface runoff in a manner which would result in flooding on- or offsite;
See analysis under item c) above.
iii) Create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems or provide substantial additional sources of polluted runoff; or
See analysis under item c) above.
iv) Impede or redirect flood flows?
As stated in the LSAP Update SEIR there are some locations within the LSAP Plan Area that are within the Federal Emergency Management Agency-designated 100-year flood hazard Zone AO. Projects within Zone AO could be subject to 100-year flood hazard. The North Site and Extension Site are located entirely within Zone X, which identifies areas with lower flood risk due to levees. The project applicant completed a preliminary Stormwater Management Plan for the project that outlines the drainage areas and proposed treatment control measures. Project design plans also include water quality control and drainage features for the North Site and Extension Site to prevent impeding or redirecting flood flows. Additionally, the project is required to comply with Section 12.60.160 of the Sunnyvale Municipal Code on the North Site and Section 13.10.020 of the City of Santa Clara City Code on the Extension Site to reduce risk of flood flows and offsite drainage. The project would not result in new significant impacts or substantially more severe impacts related to flood flows than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to flood flows than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to flood flows the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid . d) In flood hazard, tsunami, or seiche zones, risk release of pollutants due to project inundation?
See analysis under item c-iv) above for impacts from flood hazards.

Seiches and tsunamis would not affect the ISI Projectproject site because the site is more than three miles from San Francisco Bay. Mudflow would not present a hazard because there are no steep, erodible slopes on or near the ISI Projectproject site. The project site is located outside of the inundation area for Stevens Creek Reservoir and is not considered to be at risk of inundation in the event of a dam failure. The project site is not in an area subject to flooding from levee failure or sea level rise. The project would not result in new significant impacts or substantially more severe impacts related to flood hazards, tsunami, or seiches than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related from flood hazards, tsunami, or seiches than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to flood hazards, tsunami, or seiches the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-71 in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.
e) Conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan?
LSAP Update SEIR
The ISI Project site is located on primarily disturbed land with limited groundwater recharge capabilities and would be required to comply with all applicable programs, policies, and regulations of the 2021 Groundwater Management Plan for the Santa Clara and Llagas Subbasins. As described in the LSAP Update SEIR, the Water Supply Assessment (WSA) completed for the ISI Project concludes that the City’s existing water supply contracts would meet the combined increase demand of the project under normal, single dry, multiple dry year conditions between 2020 and 2040. The project is not located within an area subject to a sustainable groundwater plan.

North Site
The project would include refinements to the design of the North Site building to ensure consistency with the building on the South Site. The project would not include any increases in the number of employees, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR. The project would continue to comply with all applicable water quality plans and policies of the City of Sunnyvale. The project also would continue to comply with all applicable programs, policies, and regulations of the 2021 Groundwater Management Plan. Further, the project would be required to adhere to SWPPP and MRP provisions. Therefore, the portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to a water quality control plan than were identified in the LSAP Update SEIR, nor would there be new feasible mitigation measures or alternatives that would reduce impacts but that ISI declines to adopt, and the findings of the certified LSAP Update SEIR remain valid. This impact would remain less than significant.

Extension Site
The project would include construction of a parking garage on the Extension Site in Santa Clara. The Extension Site is located on primarily disturbed land with limited groundwater recharge capabilities and would be required to comply with all applicable programs, policies, and regulations of the 2021 Groundwater Management Plan for the Santa Clara and Llagas Subbasins. The project would also continue to comply with all applicable water quality plans and policies of the City of Santa Clara and would be required to adhere to SWPPP and MRP provisions. The Extension Site is not located within an area subject to a sustainable groundwater plan. The portion of the project on the Extension Site would increase landscaping and thus pervious surfaces on the site resulting in increased groundwater percolation. The proposed parking garage would have minimal water demand. Impacts would remain less than significant. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to a water quality control plan than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to a water quality control plan than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to water quality control plans the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Mitigation Measures from LSAP Update EIR
No mitigation measures were identified in the certified LSAP Update SEIR for the ISI Project regarding hydrology and water quality, nor are any additional mitigation measures required for the project.

Conclusion
No new circumstances or project changes related to hydrology and water quality have occurred that would result in new or substantially more severe hydrology and water quality impacts than were identified in the LSAP Update SEIR, Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-72 Intuitive North Site Modification Project Environmental Checklist nor is there new information of substantial importance that shows the project will have one or more significant effects not previously discussed or that the discussed effects would be substantially more severe or there would be newly feasible mitigation measures or alternatives or substantially different mitigation measures or alternatives that would substantially reduce impacts but that ISI declines to adopt. Therefore, the findings of the certified LSAP Update SEIR remain valid, and no additional analysis is required.

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-73

4.11 LAND USE AND PLANNING
Environmental Issue Area
Where Impact Was
Analyzed in the
LSAP Update Draft
and Final SEIR.

Do Project Changes
Involve New or
Substantially More
Severe Significant
Impacts?
Do Any New
Circumstances Involve
New or Substantially
More Severe
Significant Impacts?
Any New
Information of
Substantial
Importance?
Do Prior Environmental
Documents Mitigations
Address/Resolve
Impacts?

11. Land Use and Planning. Would the project:
a) Physically divide an established
community?
Draft SEIR
Impact 3.10-1
No No No NA, this impact
would be less than
significant
b) Cause a significant environmental impact
due to a conflict with any land use plan,
policy, or regulation adopted for the
purpose of avoiding or mitigating an
environmental effect?
Draft SEIR
Impact 3.10-2
No No No N/A, this impact
would be less than
significant.

4.11.1 Discussion
No change in the environmental and regulatory settings related to land use and planning described in LSAP EIR Section 3.1, Land Use, has occurred since certification of the LSAP Update SEIR . As previously noted, the City Council adopted an update to the City’s Land Use and Transportation Element (LUTE) of its General Plan in April 2017. The LUTE incorporates and integrates policy direction and land use patterns from other City of Sunnyvale planning documents, including the LSAP.

The Extension Site has a City of Santa Clara General Plan land use designation of Medium Density Residential and is zoned Light Industrial (ML). The Medium Density Residential Land Use is intended for residential development at densities ranging from 20 to 36 units per gross acre. This density range accommodates a variety of housing types. It is primarily intended for areas with access from collector or arterial streets or in close proximity to neighborhood centers and mixed uses. Building types can include a combination of low-rise apartments, townhouses and rowhouses with garage or below-grade parking. The Light Industrial zoning district permits general industrial development, and is intended to accommodate industries operating substantially within an enclosed building.

Permitted uses include commercial storage, plants and facilities, incidental retail sales, and incidental accessory buildings (Santa Clara Zoning Code Chapter 18.48).
a) Physically divide an established community?
LSAP Update SEIR
The ISI Project would result in buildout of a corporate campus within the LSAP. The ISI Project does not contain housing and is located in an industrial area. The ISI Project includes several circulation improvements that would provide improved connectivity for pedestrians and multi-modal transportation. Therefore, the LSAP Update SEIR determined that the ISI Project would have a less than significant impact regarding the division of an established community (see LSAP Update SEIR Impact 3.1.0-1).

North Site
Existing uses on the North Site consist of a private sports and recreation complex . The North Site would be developed, as analyzed in the LSAP Update SEIR, and refinements to the design of the North Site building would not have additional land use impacts. Moving the loading dock location on the North Site and refining the geometry of the signalized intersection at 945 Kifer Road would occur on a site that is already developed and surrounded by industrial uses. The project would not conflict with transportation and circulation improvements proposed by the LUTE update (see Section 3.16, “Transportation” for discussion on project impacts to transportation). The project would be consistent with existing development patterns and would not introduce any features that would not divide Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-74 Intuitive North Site Modification Project Environmental Checklist an established community. Therefore, the portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to physically dividing an established community than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to a physically dividing an established community than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to physically dividing an established community the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid .

Extension Site
Existing uses on the Expansion Site consist of a paved surface parking lot with ornamental trees. The project would result in construction of a parking garage on the extension site, to replace the underground parking garage proposed on the North Site. The parking garage would occur on a site that is already developed and surrounded by industrial, commercial, and residential uses and existing roadways. The project does not propose new roadways or other circulation impediments that could and would create physical divisions in an established community.

Therefore, the portion of the project on the Extension Site would not divide an established community. Impacts would remain less than significant. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to physically dividing an established community than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to a physically dividing an established community than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to physically dividing an established comm unity the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid. b) Cause a significant environmental impact due to a conflict with any land use plan, policy, or regulation adopted for the purpose of avoiding or mitigating an environmental effect?
LSAP Update SEIR
The LSAP establishes the development of a mixed-use, compact, and well-connected urban form that would further increase housing and employment opportunities in the City. The LSAP Update SEIR concluded that implementation of LSAP modifications would ensure integration and compatibility of new development with the City’s sustainable growth vision and associated General Plan and LSAP policy provisions. This includes the ISI Project site, where the land use changed from Industrial (IND) to Transit Mixed-Use (TMU) as part of the adoption of the LSAP Update.

As described in the LSAP Update SEIR, the City redesignated the ISI Project as TMU and rezoned to M-S/LSAP 60 percent (North Site) and M-S/LSAP 120 percent (South Site). The M-S/LSAP zone permits office, R&D, and industrial uses with the percentage referring to the allowable floor area ratio. Similarly, the TMU land use designation permits Office/R&D uses.

North Site
The City of Sunnyvale General Plan and LSAP provide a united vision meant to guide comprehensive development in the LSAP area.

The project would include minor design updates and the North Site building and updates to the drive aisle on Kifer Road. The portion of the project on the North Site remains consistent with LSAP goals and is subject to LSAP design guidelines and policies. The project would not include any increases in the number of employees, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-75 Update SEIR. Therefore, the portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to a conflicts with a land use plan than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to conflicts with a land use plan than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to conflicts with a land use plan the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Extension Site
The Extension Site has a zoning designation in the City of Santa Clara of Light Industrial (ML). The ML zoning district is intended to accommodate industries operating substantially within an enclosed building (City of Santa Clara City Code Section 18.48.020). Permitted uses include research offices and laboratories; testing offices and laboratories; professional, financial, and administrative offices; manufacture, assembling, and packaging of electronic equipment, instruments, and devices; commercial storage, plants and facilities, incidental retail sales, incidental and accessory buildings such as storage buildings and warehouses that comprise less than twenty-five percent of the total lot area and are shielded from public view; and public or private automobile parking lots improved and landscaped in accordance with the Santa Clara Zoning Code requirements. The proposed parking structure would be considered an accessory building to the North Site and the existing commercial buildings located at 2900 Semiconductor Drive and would require a Use Permit per SCCC 18.48.040. Therefore, the project would be consistent with the City of Santa Clara Zoning Code. The parking provided for the North Site building is consistent with the City’s parking requirements. The portion of the project on the Extension Site remains consistent with LSAP goals and the applicant has agreed to comply with the LSAP design guidelines and policies. I mpacts would remain less than significant. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to a conflicts with a land use plan than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to conflicts with a land use plan than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to conflicts with a land use plan the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Mitigation Measures from LSAP Update EIR
No mitigation measured were needed for the LSAP or LSAP Update regarding land use and planning. No mitigation measures pertaining to land use and planning would be required for the project.

Conclusion
No new circumstances or project changes related to land use and planning have occurred that would result in new or substantially more severe land use and planning impacts than were identified in the LSAP Update SEIR, nor is there new information of substantial importance that shows the project will have one or more significant effects not previously discussed or that the discussed effects would be substantially more severe or there would be newly feasible mitigation measures or alternatives or substantially different mitigation measures or alternatives that would substantially reduce impacts but that ISI declines to adopt. Therefore, the findings of the certified LSAP Update SEIR remain valid, and no additional analysis is required.

Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-76 Intuitive North Site Modification Project Environmental Checklist

4.12 MINERAL RESOURCES
Environmental Issue Area
Where Impact Was
Analyzed in the
LSAP Update Draft
and Final SEIR.

Do Project Changes
Involve New or
Substantially More
Severe Significant
Impacts?
Do Any New
Circumstances Involve
New or Substantially
More Severe
Significant Impacts?
Any New
Information of
Substantial
Importance?
Do Prior Environmental
Documents Mitigations
Address/Resolve
Impacts?

12. Mineral Resources. Would the Project:
a) Result in the loss of availability of a
known mineral resource that would be of
value to the region and the residents of
the state?
Draft SEIR
Section 1.3.2
No No No NA, there would be
no impact.
b) Result in the loss of availability of a
locally-important mineral resource
recovery site delineated on a local
general plan, specific plan or other land
use plan?
Draft SEIR
Section 1.3.2
No No No NA, there would be
no impact.

4.12.1 Discussion and Conclusion
a) Result in the loss of availability of a known mineral resource that would be of value to the region and the residents of the state?
b) Result in the loss of availability of a locally important mineral resource recovery site delineated on a local general plan, specific plan, or other land use plan? Mineral resource impacts were scoped out of the LSAP EIR at the notice of preparation stage because no mineral resources exist in the LSAP plan area, and because the area is already developed with urban land uses. Similarly, there are no mineral resources on or near the Extension Site in the City of Santa Clara. The project site does not contain mineral resources and is not a mineral resource recovery site. The project would not result in new significant impacts or substantially more severe impacts related to a mineral resource than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to a mineral resource than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to mineral resources the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Mitigation Measures from LSAP Update EIR
No mitigation measures were identified in the certified LSAP Update SEIR regarding mineral resources, nor are any additional mitigation measures required for the project.

Conclusion
No new circumstances or project changes related to mineral resources have occurred that would result in new or substantially more severe mineral resources impacts than were identified in the LSAP Update SEIR, nor is there new information of substantial importance that shows the project will have one or more significant effects not previously discussed or that the discussed effects would be substantially more severe or there would be newly feasible mitigation measures or alternatives or substantially different mitigation measures or alternatives that would substantially reduce impacts but that ISI declines to adopt. Therefore, the findings of the certified LSAP Update SEIR remain valid, and no additional analysis is required.

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-77

4.13 NOISE
Environmental Issue Area
Where Impact Was
Analyzed in the
LSAP Update Draft
and Final SEIR.

Do Project Changes
Involve New or
Substantially More
Severe Significant
Impacts?
Do Any New
Circumstances Involve
New or Substantially
More Severe
Significant Impacts?
Any New
Information of
Substantial
Importance?
Do Prior Environmental
Documents Mitigations
Address/Resolve
Impacts?

13. Noise. Would the project result in:
a) Generation of a substantial temporary or
permanent increase in ambient noise
levels in the vicinity of the project in
excess of standards established in the
local general plan or noise ordinance, or
applicable standards of other agencies,
or a substantial temporary or permanent
increase in noise levels above existing
ambient levels that could result in an
adverse effect on humans?
Draft SEIR
Impacts 3.11-1,

3.11-3, and 3.11-4

No No No NA, impact would
be less than
significant with
application of the
adopted mitigation
measures.
b) Generation of excessive groundborne
vibration or groundborne noise levels?
Draft SEIR
Impact 3.11-2

No No No NA, impact would
be less than
significant
c) For a project located within the vicinity of
a private airstrip or an airport land use
plan or, where such a plan has not been
adopted, within two miles of a public
airport or public use airport, would the
project expose people residing or
working in the project area to excessive
noise levels?
Draft SEIR page

3.11-10

No No No NA, no impact
would occur.

4.13.1 Discussion
No substantial change in the environmental and regulatory settings related to noise in Section 3.11: “Noise and Vibration,” described in LSAP Draft EIR has occurred since certification of the LSAP EIR and the LSAP Update SEIR.

However, the proposed Extension Site is located in the City of Santa Clara, outside of the boundaries of the LSAP.

Therefore, portions of the following analysis pertaining to the Extension Site are based on City of Santa Clara construction and operations noise standards and exemptions from the City of Santa Clara 2010-2035 General Plan (General Plan) and the City of Santa Clara City Code, as described below.

City of Santa Clara 2010-2035 General Plan
The Noise Element of the City of Santa Clara General Plan provides noise standards for various land uses to determine compatibility with the General Plan. Table 4.13-1 summarizes the noise standards presented in the General Plan.

Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-78 Intuitive North Site Modification Project Environmental Checklist Table 4.13-1 City of Santa Clara General Plan Noise Standards (Ldn, CNEL) Land Use Type Compatible Require Design and Insulation to Reduce Noise Levels Incompatible 1
Residential Less than 55 55-70 70+
Educational Less than 55 55-70 70+
Recreational Less than 65 65-75 75+
Commercial Less than 65 65-75 75+
Industrial Less than 70 70-80 80+
Open Space All ranges considered acceptable All ranges considered acceptable All ranges considered acceptable Note: Ldn = day-night average sound level; CNEL = community noise equivalent level. 1 General Plan states that land uses in this range are considered incompatible except when entirely indoors and an interior noise level of 45 Ldn can be maintained.

Source: City of Santa Clara 2010.

City of Santa Clara City Code
Chapter 9.10 “Regulation of Noise and Vibration” of the City of Santa Clara City Code details regulations and exemptions for both fixed sources (Article I) and off-street operations of certain construction sites (Article II). Table

4.13-2 summarizes exterior noise limits for all properties within a specified zone.

Table 4.13-2 City of Santa Clara City Code Exterior Noise Limits (dBA) Zoning Category Time Period Level (dBA)
Category 1
Single-family and Duplex Residential
Commencing at 7:00 a.m. and ending at
10:00 p.m. that evening
Commencing at 10:00 p.m. and ending at
7:00 a.m. the following Morning
55 50
Category 2
Multiple-family Residential, Public Space
Commencing at 7:00 a.m. and ending at
10:00 p.m. that evening
Commencing and 10:00 p.m. and ending at
7:00 a.m. the following Morning
55 50
Category 3
Commercial Office
Commencing at 7:00 a.m. and ending at
10:00 p.m. that evening
Commencing and 10:00 p.m. and ending at
7:00 a.m. the following Morning
65 60
Category 4
Light Industrial Anytime 70
Heavy Industrial Anytime 75
Note: dBA = A-weighted decibels
Source: City of Santa Clara 2022.

The City of Santa Clara provides an exemption for construction activities which occur during allowed hours specified in the code of 7 a.m. to 6 p.m. weekdays and 9 a.m. to 6 p.m. weekends. Construction is not allowed on Sundays or holidays (Santa Clara City Code, Chapter 9.10, Section 9.10.070).

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-79 a) Generation of a substantial temporary or permanent increase in ambient noise levels in the vicinity of the project in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies, or a substantial temporary or permanent increase in noise levels above existing ambient levels that could result in an adverse effect on humans?
LSAP Update SEIR
The LSAP Update SEIR determined that because the ISI Project would comply with the City of Sunnyvale’s time-of- day requirements and implement the adopted LSAP Mitigation Measure MM 3.6.4, which requires multiple measures for minimizing noise levels from construction equipment, the ISI Project would minimize noise exposure to off-site noise-sensitive receptors and impacts related to construction noise would be less than significant.

The LSAP Update SEIR concluded that noise-generating activities associated with operation of the ISI Project would not expose off-site residential receptors to noise levels that exceed the daytime standard of 60 decibels ( dB) and nighttime standard of 50 dB established by Section 19.42.030 of the Sunnyvale Municipal Code. Additionally, the LSAP Update SEIR stated that operational noise levels would not combine to exceed the 50-dB standard because they would originate from different areas of the ISI Project site and the nearest off-site residence to each noise source would not be the same. Lastly, it was determined that noise associated with on- site operational activities would not expose off-site residences to noise levels that exceed the normally acceptable standard of 60 dB CNEL for residential land uses that is recommended by General Plan Policy SN-8.5. For these reasons, operational noise impacts were determined to be less than significant.

North Site
Construction Noise
The proposed design (e.g., building square footage, pavement square footage, number of buildings) does not differ from that which was approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR . The proposed parking structure would no longer be underground and would not require extensive excavation or use of piles needed for an underground structure. Therefore, the project would have a reduced construction duration and intensity as assumed in the LSAP Update EIR., Additional types of equipment beyond what was analyzed in the LSAP Update EIR would not be used. Therefore, construction-related noise generation and duration would not be greater than what was accounted for in the LSAP Update SEIR. Additionally, the portion of the project on the North Site would be required to comply with Mitigation Measure MM 3.6.4, further reducing the potential for construction- related noise impacts.

The North Site no longer includes the previously proposed underground parking structure and would therefore not require excavation. Impacts related to noise from construction on the North Site would be less than what was addressed in the LSAP Update SEIR because excavation equipment and hauling trucks would not be required, leading to a reduction in noise from construction equipment. Therefore, noise levels and duration resulting from construction activities would not be greater than what was analyzed in the SEIR. Therefore, the portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to a construction noise than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to construction noise than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to construction noise the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt.

The findings of the LSAP Update SEIR for the ISI Project remain valid. This impact would remain less than significant with implementation of adopted LSAP Update SEIR Mitigation Measure MM 3.6.4.

Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-80 Intuitive North Site Modification Project Environmental Checklist Operational Noise
Development on the North Site would not involve operational activities that would vary in type or intensity from those which were accounted for in the LSAP Update SEIR. Updates to the North Site would include refinements to the design of the North Site building to ensure consistency with the building on the South Site. The project would not include any changes in the number of employees, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR that would create new noise impacts. In addition, the portion of the project on the North Site does not propose any new stationary sources of noise . Therefore, noise levels, duration or sources would not substantially differ from what was analyzed in the LSAP Update SEIR. The portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to operational noise than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to operational noise than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to operational noise the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid .

Extension Site
Construction Noise
Construction of the proposed Extension Site parking garage would temporarily generate noise related to construction activities during the construction period. Specific timing of each construction phase and activity was not available at the time of this analysis, and therefore, the construction-noise evaluation of the Extension Site conservatively assumed that three of the highest noise-generating pieces (i.e., one grader, one dozer , and one backhoe) of equipment could operate simultaneously near each other, generating worst-case construction noise levels during grading. It is estimated that onsite construction-related activities could generate a combined hourly average noise level of approximately 83.3 energy-equivalent noise level (Leq) and a maximum noise level as high as 87.3 maximum noise level (the maximum instantaneous noise level during a specific period) (L max) at 50 feet. Detailed inputs and parameters for the estimated construction noise exposure levels are provided in Appendix C.

The closest off-s ite receptor to the Extension Site is a commercial/industrial building located approximately 150 feet east of the proposed Extension Site project area in the City of Santa Clara. The closest noise-sensitive receptors to the Extension Site (residential uses) are condominiums located approximately 1,700 feet south of proposed Extension Site in the City of Sunnyvale. Based on the construction noise modeling results, construction activity during the loudest anticipated construction phases (i.e., grading) would result in construction noise levels of 73.8 Leq A-weighted decibels (dBA) and 77.8 Lmax dBA at the nearest commercial/industrial receptors, 150 feet to the east of the project site, and noise levels of 52.7 Leq dBA and 56.7 Lmax dBA at the noise-sensitive receptors 1,700 feet south of the project site. As stated above, the City of Santa Clara City Code provides an exemption from regulation for construction- related noise generation that occurs between 7:00 a.m. and 6:00 p.m. Monday to Friday and 9:00 a.m. to 6:00 p.m. on Saturday and prohibits construction-generated noise on Sundays or federal holidays (City of Santa Clara 2020a). The City of Sunnyvale also provides a time-of-day exemption in Section 16.08.030 of the Sunnyvale Municipal Code (i.e., 7:00 a.m. and 6:00 p.m. Monday to Friday, 8:00 a.m. to 5:00 p.m. on Saturday) (City of Sunnyvale 2019b). Because the project would comply with both the City of Santa Clara and the City of Sunnyvale’s time-of-day regulations for construction, the project would be considered exempt from regulation of construction-related noise. The project site is an urban area where construction noise is part of the urban noise environment. In addition, ISI has agreed that the construction activities on the Extension Site would also be subject to the same mitigation measures contained within the LSAP (i.e., Mitigation Measure 3.6.4) as described above, further reducing noise. Compliance with City of Santa Clara requirements and adopted mitigation measures would ensure that construction noise levels do not create health impacts (e.g., sleep disturbance during nighttime hours). The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to a construction noise than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-81 substantial more severe impacts related to construction noise than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to construction noise the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt.

The findings of the LSAP Update SEIR for the ISI Project. This impact would remain less than significant with implementation of adopted LSAP Update SEIR Mitigation Measure MM 3.6.4.

Operational Noise
The Extension Site parking garage provides parking service to a commercial office land use. Therefore, it is assumed that operation of the parking garage would occur during the daytime hours (7:00 a.m . to 10:00 p.m.) outlined in Santa Clara Municipal Code. The change in the noise environment associated with operation of the project is analyzed assuming 937 net new parking spaces (884 net new spaces on the Extension Site + 33 surface parking spaces on the North Site + 20 spaces on the South Site) to ensure that the worst-case scenario was analyzed. It should be noted that because this represents the worst-case parking scenario as it relates to noise generation, it can be assumed that on typical day, noise levels would be even lower than reported. Parking activity during the peak hour at the proposed Extension Site parking structure would generate noise levels of 61.8 dB L eq at 50 feet. This reference level, as well as
the noise levels at the sensitive receptors, were estimated using a parking lot noise calculator based on calculation methods established by the Federal Transit Administration in combination with a peak rate of 756 automobiles per hour for the project as provided in the traffic study prepared for the project (FTA 2018) (Hexagon Transportation Consultants 2023). Detailed inputs and parameters for the estimated operational noise exposure levels are provided in Appendix C. Noise generated by parking activity at the Extension Site parking structure would attenuate to 51.6 dB Leq at the industrial/commercial receptor located 150 feet from the project site in the City of Santa Clara and 30.5 dB Leq at the multiple family residential receptors located 1,700 feet from the project site in the City of Sunnyvale.

Therefore, operation of the project would not result in an exceedance of the daytime or nighttime noise standards for commercial land uses in the City of Santa Clara (i.e., 65 dB and 60 dB, respectively), nor would the project result in an exceedance of the daytime or nighttime noise standards for residential land uses in the City of Sunnyvale (i.e., 60 dB and 50 dB, respectively). Compliance with these noise standards would avoid potential health impacts such as sleep disturbance during nighttime hours. Impacts would remain less than significant. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to operational noise than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to operational noise than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to operational noise the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt.

The findings of the LSAP Update SEIR for the ISI Project remain valid. b) G eneration of excessive groundborne vibration or groundborne noise levels? LSAP Update SEIR
The LSAP Update SEIR analysis stated that the ISI Project would not result in the long-term operation of any ground vibration–generating sources in close proximity to off-site sensitive receptors and that the types of ground vibration– generating construction and demolition activities that would occur on the ISI Project site would be like other land uses developed in the LSAP plan area. The analysis concluded that because exposure standards for human annoyance and structural damage would not be exceeded at off-site receptors and that the impact would be less than significant.

Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-82 Intuitive North Site Modification Project Environmental Checklist North Site
Construction of the North Site would not result in changes to construction activity types, duration, equipment type/number, or intensity that would be substantially different or greater than those that were analyzed in the LSAP Update SEIR. Subsequently, construction of the portion of the project on the North Site would be expected to involve similar types of ground vibration–generating construction and demolition activities as was analyzed in the SEIR and would not include any new sources of vibration (i.e. piledriving or blasting). For these reasons, it is not expected that exposure standards for human annoyance and structural damage would be exceeded at off -site receptors. Therefore, the portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to vibration than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to vibration than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to vibration the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Extension Site
Project construction on the Extension Site would not involve the use of ground vibration–intensive activities, such as pile driving or blasting. Pieces of equipment that generate lower levels of ground vibration, such as dozers and pavers, would be used during construction. These types of common construction equipment do not generate substantial levels of ground vibration that could result in structural damage, except at extremely close distances (i.e., within at least 10 feet). The most ground vibration–intensive activity performed during project construction would be use of a large bulldozer. Large bull dozers generate ground vibration levels of 0.089 peak particle velocity (PPV) at 25 feet (FTA 2018). At the nearest receptor, an industrial/commercial building located 150 east of the Extension Site area, vibration levels would be 0.006 PPV. Vibration from this source would not exceed the threshold of significance of 0.08 in/sec PPV for building structural damage and would be below the threshold of human perception of 0.01 inches per second (in/sec) PPV. (Caltrans 2013) Because these values are well below the lowest thresholds for structural damage and human annoyance at 150 feet, it can be reasonably assumed that these values would be even lower at the next nearest receptor 1,700 feet south of the project site. Therefore, construction generated vibration from the Extension Site would not result in the potential for structural damage or human annoyance . Impacts would remain less than
significant. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to vibration than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to vibration than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to vibration the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid. c) For a project located within the vicinity of a private airstrip or an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels?
As described in the “Issues Not Discussed Further” section in Section 3.11, “Noise and Vibration,” of the LSAP Update SEIR, the 2016 LSAP EIR concluded that there would be no impact for airport-generated noise because the LSAP boundary is located outside of the Moffett Federal Airfield noise contours, which is the closest airport to the LSA P.

The LSAP SEIR Update did not change this conclusion because the boundary expansion, which includes the ISI Project, would not expand into any airport noise contours or result in the exposure of people to excessive a noise levels associated with airport activity. The project would not involve moving the project location of the ISI Project and Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-83 the Extension Site is similarly not near an airport. The project would not result in new significant impacts or substantially more severe impacts related to airport noise than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to airport noise than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to airport noise the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid .

Mitigation Measures from LSAP Update EIR
Mitigation Measure MM 3.4.6 was adopted as part of the LSAP EIR to ensure reduction of construction noise. The following adopted mitigation measure referenced in the LSAP EIR and LSAP Update SEIR analysis would continue to be applicable for the North Site if the project was approved. ISI has also agreed to implement this mitigation measure on the Extension Site in a letter dated December 20, 2023 and as included on the project site plans.

Mitigation Measure MM 3.6.4
Subsequent projects in the LSAP shall employ site-specific noise attenuation measures during construction to reduce the generation of construction noise. These measures shall be included in a Noise Control Plan that shall be submitted for review and approval by the City of Sunnyvale Building Services Division. Measures specified in the Noise Control Plan and implemented during construction shall include, at a minimum, the following noise control strategies:
 Equipment and trucks used for construction shall use the best available noise control techniques (e.g., improved mufflers, equipment redesign, use of intake silencers, ducts, engine enclosures, and acoustically attenuating shields or shrouds;
 Impact tools (e.g., jack hammers, pavement breakers, and rock drills) used for construction shall be hydraulically or electrically powered wherever possible to avoid noise associated with compressed air exhaust from pneumatically powered tools. Where use of pneumatic tools is unavoidable, an exhaust muffler on the compressed air exhaust shall be used; this muffler can lower noise levels from the exhaust by up to about 10 dBA.

External jackets on the tools themselves shall be used where feasible; this could achieve a reduction of 5 dBA.

Quieter procedures, such as use of drills rather than impact tools, shall be used; and  Stationary noise sources shall be located as far from adjacent receptors as possible, and they shall be muffled and enclosed within temporary sheds, incorporate insulation barriers, or include other measures.  Noise reducing pile-driving techniques shall be employed during Project construction. These techniques shall include:
 Installing intake and exhaust mufflers on pile-driving equipment;  Vibrating piles into place when feasible, and installing shrouds around the pile- driving hammer where feasible;
 Implement “quiet” pile-driving technology (such as pre-drilling of piles and the use of more than one pile driver to shorten the total pile driving duration), where feasible, in consideration of geotechnical and structural requirements and conditions; - Use cushion blocks to dampen impact noise, if feasible based on soil conditions. Cushion blocks are blocks of material that are used with impact hammer pile drivers. They consist of blocks of material placed atop a piling during installation to minimize nois e generated when driving the pile. Materials typically used for cushion blocks include wood, nylon and micarta (a composite material); and - At least 48 hours before pile-driving activities, the applicant shall notify building owners and occupants within 600 feet of the Project area of the dates, hours, and expected duration of such activities.

Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-84 Intuitive North Site Modification Project Environmental Checklist Conclusion
No new circumstances or project changes related to noise have occurred that would result in new or substantially more severe noise impacts than were identified in the LSAP Update SEIR, nor is there new information of substantial importance that shows the project will have one or more significant effects not previously discussed or that the discussed effects would be substantially more severe or there would be newly feasible mitigation measures or alternatives or substantially different mitigation measures or alternatives that would substantially reduce impacts but that ISI declines to adopt. Therefore, the findings of the certified LSAP Update SEIR remain valid, and n o additional analysis is required.

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-85

4.14 POPULATION AND HOUSING
Environmental Issue Area
Where Impact Was
Analyzed in the
LSAP Update Draft
and Final SEIR.

Do Project Changes
Involve New or
Substantially More
Severe Significant
Impacts?
Do Any New
Circumstances Involve
New or Substantially
More Severe
Significant Impacts?
Any New
Information of
Substantial
Importance?
Do Prior Environmental
Documents Mitigations
Address/Resolve
Impacts?

14. Population and Housing. Would the project:
a) Induce substantial population growth in
an area, either directly (for example, by
proposing new homes and businesses) or
indirectly (for example, through expansion
of roads or other infrastructure)?
Draft SEIR
Impact 3.12-1
No No No NA, impact would
be less than
significant
b) Displace substantial numbers of existing
people or housing, necessitating the
construction of replacement housing
elsewhere?
Draft SEIR page

3.12-5
No No No Na, there would be
no impact.

4.14.1 Discussion
No substantial change in the environmental and regulatory settings related to population and housing described in LSAP EIR Section 3.1, Population and Housing, has occurred since certification of the LSAP EIR. The LSAP approved buildout of 2,323 new residential units and 1,200,000 new net square feet of Office/R&D uses in 2016. The LSAP Update SEIR in 2021 included an additional 3,612 new residential units, for a total LSAP development potential of 5,935 units.
a) Induce substantial population growth in an area, either directly (for example, by proposing new homes and businesses) or indirectly (for example, through expansion of roads or other infrastructure)?
As analyzed in Impact 3.12-1 of the LSAP Update SEIR ISI ProjectProject would not exceed the amount of new office/R&D development identified in the LSAP. The ISI Project would not be anticipated to generate employment opportunities that exceed the planned capacity of the LSAP or induce substantial population growth. The project would not include any increases in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR. The parking garage would replace the underground parking garage anticipated on the North Site and there would be no change in the total number of parking spaces available for the ISI Project. The project would not result in new significant impacts or substantially more severe impacts related to a population growth than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to population growth than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to population growth the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-86 Intuitive North Site Modification Project Environmental Checklist b) Displace substantial numbers of existing people or housing, necessitating the construction of replacement housing elsewhere?
The project would consist of a modification for the North Site that would remove the approved underground parking and relocate this parking to a new above-grade parking structure on the Extension Site in the City of Santa Clara.

Also included in the project are minor architectural changes to the approved north building and a different geometry for the approved private driveway leading to the loading area and new garage. The Extension Site currently includes a paved surface level parking lot. Therefore, the project would not displace any residences or persons. The project would not include any increases in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR. The parking garage is intended to replace the underground parking garage anticipated on the North Site. The project would not result in new significant impacts or substantially more severe impacts related to housing than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to housing than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to housing the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Mitigation Measures from LSAP Update EIR
No mitigation measures were needed for the certified LSAP EIR regarding population and housing. No additional mitigation measures are required for the project for this issue.

Conclusion
No new circumstances or project changes related to population and housing have occurred that would result in new or substantially more severe population and housing impacts than were identified in the LSAP Update SEIR, nor is there new information of substantial importance that shows the project will have one or more significant effects not previously discussed or that the discussed effects would be substantially more severe or there would be newly feasible mitigation measures or alternatives or substantially different mitigation measures or alternatives that would substantially reduce impacts but that ISI declines to adopt. Therefore, the findings of the certified LSAP Update SEIR remain valid, and no additional analysis is required.

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-87

4.15 PUBLIC SERVICES
Environmental Issue Area
Where Impact Was
Analyzed in the
LSAP Update Draft
and Final SEIR.

Do Project Changes
Involve New or
Substantially More
Severe Significant
Impacts?
Do Any New
Circumstances Involve
New or Substantially
More Severe
Significant Impacts?
Any New
Information of
Substantial
Importance?
Do Prior Environmental
Documents Mitigations
Address/Resolve
Impacts?

15. Public Services
a) Would the project result in substantial
adverse physical impacts associated with
the provision of new or physically altered
governmental facilities, need for new or
physically altered governmental facilities,
the construction of which could cause
significant environmental impacts, to
maintain acceptable service ratios,
response times or other performance
objectives for any public services:

i) Fire protection? Draft SEIR
Impact 3.13-1
No No No NA, impact would
be less than
significant
ii) Police protection? Draft SEIR
Impact 3.13-1
No No No NA, impact would
be less than
significant
iii) Schools? Draft SEIR
Impact 3.13-2
No No No NA, impact would
be less than
significant
iv) Parks? Draft SEIR
Impact 3.13-3
No See below in
Section 4.16,
Recreation
See below in
Section 4.16,
Recreation
See below in
Section 4.16,
Recreation

4.15.1 Discussion
No significant changes in the environmental setting regarding public services have occurred since release of the LSAP Update Final SEIR that would alter the SEIR impact analysis. The City of Santa Clara is served by the Santa Clara City Fire Department and City of Santa Clara Police Department. Santa Clara Unified School District services schools within the City. a) Result in substantial adverse physical impacts associated with the provision of new or physically altered governmental facilities, or the need for new or physically altered governmental facilities, the construction of which could cause significant environmental impacts, in order to maintain acceptable service ratios, response times, or other performance objectives for any of the public services:

Fire protection?
North Site
The ISI Project would add additional employees to the LSAP area, which may increase fire protection. As discussed in the LSAP Update SEIR the ISI Project would fall within the remaining allowable net new Office/R&D development cap of the adopted LSAP. Therefore, increased demand for public services associated with the ISI Project were accounted for in the LSAP Update SEIR. The project would not include any increases in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-88 Intuitive North Site Modification Project Environmental Checklist Update SEIR. Therefore, the project would not increase demand for fire protection facilities beyond what was analyzed in the LSAP Update SEIR. Therefore, the portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to fire protection than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to fire protection than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to fire protection the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Extension Site
Santa Clara City Fire Department Station 9 is located approximately 0.9 miles east of the project site, at 3011 Corvin Drive. The City’s Station 2 is located at 795 Arques Avenue, approximately 0.5 miles northwest of the Extension Site. The project would result in a parking garage on the Extension Site. The proposed parking garage would be built consistent with the Santa Clara Municipal and Fire Code that would reduce fire risk form the project. The portion of the project on the Extension Site would not involve a use that adds new employees requiring fire protection services and would not increase demand for fire protection beyond what was analyzed in the LSAP Update SEIR. As parking structures are intended for parking a car and then leaving the structure they do not require increased fire services. As such, the proposed parking parage would not result in the need for new or expanded fire facilities. Impacts would remain less than significant. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to fire protection than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to fire protection than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to fire protection the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Police protection?
North Site
The ISI Project would add additional employees to the LSAP area, which may increase police protection. As discussed in the LSAP Update SEIR the ISI Project would fall within the remaining allowable net new Office/R&D development cap of the adopted LSAP. Therefore, increased demand for public services associated with the ISI Project were accounted for in the LSAP EIR. The project would not include any increases in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR.

Therefore, the project would not increase demand for fire protection facilities beyond what was analyzed in the LSAP Update SEIR. Therefore, the portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to police protection than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to police protection than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to police protection the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Extension Site
The nearest police station to the site is the City of Sunnyvale Police Station is located 700 All America Way approximately 2 miles west of the project site. The nearest City of Santa Clara police station is located at 3992 Rivermark Parkway approximately 3 miles northeast of the project site. The project would result in a parking garage on Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-89 the Extension Site and would not increase the number of parking spaces for the ISI Project assumed in the LSAP Update SEIR. The project would be constructed consistent with the City of Santa Clara City Code ensuring safety within the parking garage. The project would adhere to Chapter 15.50 of the Santa Clara Municipal Code for uniform building security and access to the garage would include a secure entry point onto the site. As the project would not increase the number of employees for ISI or result in increased population the project would not result in a significant impact to the Santa Clara police department. Therefore, the project would not increase the demand for police protection beyond what was analyzed in the LSAP Update SEIR. Impacts would remain less than significant. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to police protection than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to police protection than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to police protection the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt.

The findings of the LSAP Update SEIR for the ISI Project remain valid.

Schools?
As discussed in the LSAP Update SEIR the ISI Project is a corporate campus development that would fall within the remaining allowable net new Office/R&D development cap of the LSAP. Therefore, the increased demand for public schools was accounted for in the LSAP EIR. As an Office/R&D project the ISI Project would not add students to area school districts, including the Sunnyvale and Santa Clara Unified school districts. However, the project applicant would pay the required school fees in accordance with SB 50.

The project would not include any increases in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR that would involve student generation. Therefore, the project would not increase demand for school facilities beyond what was analyzed in the LSAP Update SEIR. The project would not result in new significant impacts or substantially more severe impacts related to schools than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to schools than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to schools the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that the re would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Parks?
See the discussion, below, in Section 4.16, “Recreation.” Mitigation Measures from LSAP Update EIR
No mitigation measures were required for the certified LSAP EIR regarding public services. No additional mitigation measures are required for the project.

Conclusion
No new circumstances or project changes related to public services have occurred that would result in new or substantially more severe public services impacts than were identified in the LSAP Update SEIR, nor is there new information of substantial importance that shows the project will have one or more significant effects not previously discussed or that the discussed effects would be substantially more severe or there would be newly feasible mitigation measures or alternatives or substantially different mitigation measures or alternatives that would substantially reduce impacts but that ISI declines to adopt. Therefore, the findings of the certified LSAP Update SEIR remain valid, and no additional analysis is required.

Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-90 Intuitive North Site Modification Project Environmental Checklist

4.16 RECREATION
Environmental Issue Area
Where Impact
Was Analyzed in
the LSAP Update
Draft and Final
SEIR.

Do Project
Changes Involve
New or
Substantially More
Severe Significant
Impacts?
Do Any New
Circumstances
Involve New or
Substantially More
Severe Significant
Impacts?
Any New
Information of
Substantial
Importance?
Do Prior
Environmental
Documents
Mitigations
Address/Resolve
Impacts?

16. Recreation
a) Increase the use of existing neighborhood and
regional parks or other recreational facilities such that substantial physical deterioration of the facility would occur or be accelerated?
Draft SEIR
Impact 3.13-3

No No No NA, impact
would be less
than significant
b) Include recreational facilities or require the
construction or expansion of recreational facilities that might have an adverse physical effect on the
environment?
Draft SEIR
Impact 3.13-3

No No No NA, impact
would be less
than significant

4.16.1 Discussion
No substantial change in the regulatory settings related to recreation, described in the LSAP Update S EIR Section

3.13, Public Services and Recreation, has occurred since certification of the LSAP Update SEIR. a) Increase the use of existing neighborhood and regional parks or other recreational facilities such that substantial physical deterioration of the facility would occur or be accelerated?
See item b) below
b) Include recreational facilities or require the construction or expansion of recreational facilities that might have an adverse physical effect on the environment? North Site
As stated in the LSAP Update SEIR, the ISI Project is a proposed corporate campus development that would fall within the remaining allowable net new Office/R&D development cap of the adopted LSAP. Updates to the North Site would include refinements to the design of the North Site building to ensure consistency with the building on the South Site. The project would not include any increases in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR. The project would not add dwelling units or additional residents to the LSAP or the surrounding area. Therefore, the project would not have increased impacts on park and recreational facilities. In addition, the ISI Project proposes private onsite open space and recreational facilities for its employees as well as a publicly accessible pedestrian - bicycle path adjacent to the Caltrain right-of-way. Because recreational facilities for employees are already included in the ISI Project, the project would not increase the use of public recreational facilities or necessitate the construction of new or expanded recreational facilities. Therefore, the portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to recreation than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to a recreation than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to recreation the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substan tially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-91 Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Extension Site
The project would include construction, demolition, and landscaping activities for the proposed parking garage on the Extension Site. The project would not include any employment generating uses or add dwelling units or additional residents to the LSAP or the surrounding area. The parking garage would be designed to serve the North Site, of which the impacts are discussed above. Therefore, the project would not have any impacts of park or recreational activities. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to recreation than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to a recreati on than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to recreation the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid .

Mitigation Measures from LSAP Update EIR
No mitigation measures were identified in the certified LSAP Update SEIR regarding recreation, nor are any additional mitigation measures required for the project.

Conclusion
No new circumstances or project changes related to recreation have occurred that would result in new or substantially more severe recreation impacts than were identified in the LSAP Update SEIR, nor is there new information of substantial importance that shows the project will have one or more significant effects not previously discussed or that the discussed effects would be substantially more severe or there would be newly feasible mitigation measures or alternatives or substantially different mitigation measures or alternatives that would substantially reduce impacts but that ISI declines to adopt. Therefore, the findings of the certified LSAP Update SEIR remain valid, and no additional analysis is required.

Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-92 Intuitive North Site Modification Project Environmental Checklist

4.17 TRANSPORTATION
Environmental Issue Area
Where Impact Was
Analyzed in the
LSAP Update Draft
and Final SEIR.

Do Project Changes
Involve New or
Substantially More
Severe Significant
Impacts?
Do Any New
Circumstances Involve
New or Substantially
More Severe
Significant Impacts?
Any New
Information of
Substantial
Importance?
Do Prior Environmental
Documents Mitigations
Address/Resolve
Impacts?

17. Transportation. Would the project:
a) Conflict with a program, plan, ordinance or
policy addressing the circulation system,
including transit, roadway, bicycle, and
pedestrian facilities?
Draft SEIR
Impacts 3.14.2
through 3.14.4
No No No NA, impact would
be less than
significant
b) Conflict or be inconsistent with CEQA
Guidelines section 15064.3, subdivision (b)?
Draft SEIR
Impact 3.14-1;
Final SEIR
identified no
change in
impact
conclusion
No No No NA, impact would
be less than
significant
c) Substantially increase hazards due to a
geometric design feature (e.g., sharp curves
or dangerous intersections) or incompatible
uses (e.g., farm equipment)?
Draft SEIR
Impact 3.14.5;
No No No NA, impact would
be less than
significant with
application of the
adopted mitigation
measures.
d) Result in inadequate emergency access? Draft SEIR
Impact 3.14.6;
No No No NA, impact would
be less than
significant

4.17.1 Regulatory Setting
The federal, state, and City of Sunnyvale regulatory setting for transportation provided in the certified LSAP Update SEIR remain applicable to this analysis. Below is a discussion of City of Santa Clara transportation provisions.

CITY OF SANTA CLARA TRANSPORTATION ANALYSIS POLICY
The City of Santa Clara Council adopted Resolution No. 20-8861, “Transportation Analysis Policy,” on June 23, 2020, establishing VMT as the primary threshold of significance for analysis of transportation impacts under CEQA. This policy includes VMT methodology, baselines, thresholds, and criteria for exempting certain types of projects from VMT analysis.

The Transportation Analysis Policy requires all projects to evaluate and disclose transportation impacts by measuring VMT and establishes level of service (LOS) as an operational measure of intersection efficiency, not required for CEQA (City of Santa Clara 2020b). The following policy requirements related to VMT have been adopted by the City :

1. Land Use Projects. For residential and office projects, projects will use the Countywide Average VMT as the baseline with a VMT reduction threshold set at 15 percent below the baseline to identify potential transportation impacts and propose mitigations.

2. Exemptions. The requirement to prepare a detailed VMT analysis applies to all projects except the following types as these projects will not result in significant transportation impacts.

A. Small Projects (110 daily trips or less).

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-93 B. Retail/Commercial uses (50,000 square feet or less for entire commercial development) that are identified as local serving.

C. Local serving public projects such as fire stations, neighborhood parks, community centers, and libraries.

D. H ousing projects with 100 percent affordable housing.

E. Transit Supportive Projects that meet the following requirements:
(I) The project is located within 0.5 mile of an existing Major Transit Stop or an existing transit stop along a High Quality Transit Corridor;
(II) For Office/R&D projects, a minimum Flood Area Ratio of 0.75; (III) For Residential projects, a minimum density of 35 units/acre; (IV) No excess parking: the project does not include more parking for use by residents, customers, or employees of the project that required by City Code;
(V) No loss of affordable dwelling units: the project does not replace affordable residential units with a smaller number of affordable units, and any replacement units are at the same level of affordability.

3. Transportation Projects. Net increase in VMT greater than the 2035 12.19 VMT per service population target consistent with Santa Clara General Plan Transportation and Mobility.

4. General Plan Amendments. Net increase in VMT greater than the 2035 12.19 VMT per service population target consistent with Santa Clara General Plan Transportation and Mobility .

5. Change of Use or Additions to Existing Development. Change of use or additions to existing developments shall be analyzed when the change of land use or addition to existing development results in additional trips in excess of the small project threshold (110 daily trips or less).

4.17.2 Discussion
a) Conflict with a program, plan, ordinance or policy addressing the circulation system, including transit, roadway, bicycle, and pedestrian facilities? Potential conflicts with public transit, bicycle and pedestrian facilities and uses are addressed in Impacts 3. 14-2 (public transit), 3.14-3 (bicycle facilities) and 3.14-4 (pedestrian facilities) of the LSAP Update SEIR.

Public Transit
Diversifying land uses and increasing densities envisioned under the LSAP would support the long- term viability of the Lawrence Caltrain station. This could increase the demand for transit services and related facilities. Caltrain is in the process of implementing the Caltrain Modernization Program (CalMod) which includes electrification and other projects that will upgrade the performance, efficiency, capacity, safety, and reliability of Caltrain’s service. The LSAP Update includes the Lawrence Station Sense of Place Plan. The Lawrence Station Sense of Place Plan requires new development in the area to implement a variety of transit and automobile circulation improvements and develop associated design standards and guidelines. It will result in improving transit connections and circulation to and from the Lawrence Caltrain Station.

As detailed in the LSAP Update SEIR the ISI Project is located within one-half mile of a high-quality transit corridor (VTA Route 20) and is near a major transit stop (i.e., Lawrence Caltrain Station). The ISI Project would include multimodal improvements to increase access to the Lawrence Caltrain Station. The LSAP Update SEIR determined that the ISI Project would increase the demand for transit, but the CalMod project would increase Caltrain capacity to provide more frequent train service at the Lawrence Caltrain Station.

The parking garage proposed by the project would replace the underground parking garage anticipated on the North Site. There would be no change in the total number of parking spaces available for the ISI Project. The project Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-94 Intuitive North Site Modification Project Environmental Checklist would not include any increases in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR that could impact transit services. Impacts to transit facilities would be similar to those analyzed in the LSAP Update SEIR. The project would not result in new significant impacts or substantially more severe impacts related to public transit than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to public transit than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to public transit the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findi ngs of the LSAP Update SEIR for the ISI Project remain valid.

Pedestrian and Bicycle
As identified in the LSAP Update SEIR various bicycle and pedestrian facility improvements would be needed to close the gaps in the existing and planned network. The planned bicycle network would provide a continuous system of Class I and Class II facilities that would allow improved and safe connections throughout the plan area. The LSAP Update includes the Lawrence Station Sense of Place Plan. The Lawrence Station Sense of Place Plan would require new development in the area, including the ISI Project, to implement a variety of pedestrian, bicycle, and automobile circulation improvements and develop associated design standards and guidelines. This would result in improving bicycle, and pedestrian connections and circulation to and from the Lawrence Caltrain Station .

As identified in Impact 3.14-3 of the LSAP Update SEIR the ISI Project would generate bicycle trips. The South Site would include the construction of a publicly accessible Class I shared-use path and private pedestrian and bicycle pathways to increase access to the Lawrence Caltrain Station. The ISI Project would provide crosswalks at all legs of the Commercial Street and Kifer Road intersection and the north, east, and west legs of the proposed signalized driveway and at the intersection of Kifer Road and the private road leading to the North Site and Extension Site. Additional pedestrian facilities included as part of the ISI Project includes a private pedestrian bridge spanning Kifer Road and connecting the North Site to the South Site. The ISI Project would include 60 bicycle spaces on the North Site and 151 bicycle spaces on the South Site. These bicycle and pedestrian facility improvements would not conflict with the requirements of the Lawrence Station Sense of Space Plan.

The parking garage proposed by the project is intended to replace the underground parking garage anticipated on the North Site. There would be no change in the total number of parking spaces available for the ISI Project. Bicycle parking would be provided near the building entrance (short-term) and in the amenity center (long term). The project would not include any increases in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR. Impacts to bicycle and pedestrian facilities would be similar to those analyzed in the LSAP Update SEIR. The project would not result in new significant impacts or substantially more severe impacts related to pedestrian and bicycle facilities than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to pedestrian and bicycle facilities than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to pedestrian and bicycle facilities the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-95 b) Conflict or be inconsistent with CEQA Guidelines section 15064.3, subdivision (b), which pertains to vehicle miles travelled?
Introduction
Pursuant to SB 743, PRC Section 21099, and California Code of Regulations Section 15064.3(a), generally, VMT is the most appropriate measure of transportation impacts and a project’s effect on automobile delay shall no longer constitutes a significant impact under CEQA. Additionally, on June 30, 2020, Sunnyvale City Council adopted a resolution and Council Policy (Policy 1.2.8, “Transportation Analysis Policy”) establishing VMT as the primary threshold of significance for analysis of transportation impacts under CEQA. Policy 1.2.8, “Transportation Analysis Policy” notes that the City of Sunnyvale will retain LOS as an operational measurement of intersection efficiency but reiterates that a project’s effect on LOS (i.e., automobile delay) is no longer considered an environmental impact under CEQA.

Therefore, the transportation analysis here-in evaluates impacts using VMT and does not include LOS analysis. The LSAP Update SEIR addressed VMT impacts under Impact 3.14-1 and concluded that the LSAP Update would result in no new significant effect to VMT, and the impact is not more severe than what the impact in the 2016 LSAP EIR would have been, if analyzed. The ISI Project analyzed as part of the LSAP Update SEIR was determined to have a less than significant VMT impact because the project would have a FAR that would meet the Sunnyvale screening criteria for office/R&D projects with a FAR ratio of more than 75 percent.

Analysis
The stated purpose of the LSAP is to promote greater use of the existing major transit stop of Lawrence Caltrain Station and guide the development of a diverse neighborhood of employment, residential, retail, other support services and open space. The area covered by the adopted LSAP is generally defined by a one-half-mile radius from the Lawrence Caltrain Station. The LSAP area analyzed in the LSAP Update SEIR, including the ISI Project, would conform to the criteria set forth in Council Policy 1.2.8, “Transportation Analysis Policy,” for the presumption of a less than significant VMT impact due to a project’s transit supportive nature and its proximity to a high-quality transit corridor and/or major transit stop.

North Site
As analyzed in the LSAP Update SEIR the North Site is within one-half mile of a major transit stop and would not have a significant VMT impact in accordance with the City of Sunnyvale Council Policy 1.2.8. In addition to the requirement for being within one-half mile of a major transit stop the City of Sunnyvale Council Policy 1.2.8 requires that a project meet the following criteria to presume a less than significant VMT impact for a project based on proximity to a major transit stop or high-quality transit corridor:
 Transit Supportive Projects (office/R&D projects with a floor area ratio of more than 75 percent or a residential project of at least 35 dwelling units/acre) within ½ mile of an existing major bus stop or existing stop along a high-quality transit corridor that meet all of the following requirements:
 Support the multimodal transportation network by facilitating access to multimodal transportation with improved pedestrian facilities, bike lanes, transit stops; does not harm or hinder access to multimodal transportation.  Does not exceed maximum parking requirements or propose higher than what is allowed per the development standards.
 Is transit oriented in design:
 has a walkable design that prioritizes pedestrians;
 is sustainable, and compact;
 facilitates ease of bicycle use;
 is focused or centered around transit; and
 Redevelopment of a site which provides at least as many affordable units as previously existed.

Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-96 Intuitive North Site Modification Project Environmental Checklist As discussed in the LSAP Update SEIR, the ISI Project would have a FAR of 77 and would meet the Sunnyvale screening criteria for office/R&D projects with a FAR ratio of more than 75 percent. The ISI Project would also include multimodal frontage improvements along both the North and South project site. The ISI Project would provide new multimodal path along the south and west boundaries of the South Site which would then be extended to the Lawrence Caltrain Station with the buildout of the LSAP. Additionally, the ISI Project would provide a free daily shuttle service between the project site and the Lawrence Caltrain Station. There ISI Project does not include housing and therefore would not need to meet the affordable housing requirement. Therefore, the ISI Project would support the multimodal transportation network by facilitating access to multimodal transportation with improved pedestrian facilities and bike lanes consistent with the Sunnyvale criteria for a less than significant VMT impact.

Updates to the North Site would include refinements to the design of the North Site building to ensure consistency with the building on the South Site. The project would not include any changes in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR that would create new VMT impacts. Therefore, the screening requirements of City of Sunnyvale Council Policy 1.2.8 would be met. The portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to VMT than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to VMT than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to VMT the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid . This impact would remain less than significant.

Extension Site
The Extension Site is within the City of Santa Clara and subject to the City’s VMT thresholds. The parking garage proposed by the project is intended to replace the underground parking garage anticipated on the North Site and there would be no change in the total number of parking spaces available for the ISI Project and a slight increase in parking available to existing buildings in Santa Clara that also would use the garage. The project would not include any increases in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR. The location of the proposed parking garage on the Extension Site would not result in noticeable increase in VMT through the City of Sunnyvale of Santa Clara. The proposed changes to the geometry of the signalized intersection and acceleration/deceleration lane improvements on Central Expressway would not result in any new trips on area roadways. The North Site in the City of Sunnyvale would generate vehicle trips, but not the parking garage itself. Therefore, the project would not generate over 110 daily trips and comply with the City of Santa Clara VMT screening criteria for change of use or additions to existing development of adding 110 daily trips or less. The Extension Site would thus not result in VMT impacts.

The project would conform to the criteria set forth in the City of Santa Clara Transportation Analysis Policy for the presumption of a less than significant VMT impact. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to VMT than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to VMT than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to VMT the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid .

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-97 c) Substantially increase hazards due to a design feature (e.g., sharp curves or dangerous intersections) or incompatible uses (e.g., farm equipment)? The LSAP Update SEIR identified several circulation network improvements to provide improved access through the Plan Area. Extensive bicycle and pedestrian facility enhancements would be implemented, including additional crosswalks, changes in signal timing, and two grade-separated pedestrian/bicycle crossings at the Caltrain tracks as part of the LSAP Update SEIR, including for the ISI Project. All of the proposed improvements would help reduce the potential for pedestrian/bicycle and vehicle conflicts. All roadway and pedestrian/bicycle facilities would be designed in accordance with City of Sunnyvale standards.

As analyzed in the LSAP Update SEIR construction of the North Site would require offsite roadway and intersection improvements, as well as alteration of existing vehicular and multimodal access points the North Site. Construction would occur in the roadway right-of-way and would likely require temporary lane closures. The project would be subject to Mitigation Measure 3.14-7 from the LSAP Update SEIR requiring preparation and implementation of a temporary traffic control plan to reduce temporary construction impacts.

Access to the proposed parking garage would be provided via a signalized intersection at 945 Kifer Road partially within the City of Sunnyvale and partially within the City of Santa Clara, as the border between cities runs through Kifer Road. The project would include changes to the geometry of the signalized intersection to accommodate the proposed private parking garage. . Vehicles could also access the proposed parking garage from the existing right- in-right-out ramp intersection on Central Expressway, which has an existing gate that will be removed as part of the project. New gated access to the site and the Kifer Road intersection design would prevent public through traffic from Central Expressway to Kifer Road. Vehicles could also access an existing right -out-only on-ramp onto Central Expressway at Semiconductor Drive, which is located on the neighboring parcel with same ownership in the City of Santa Clara. Vehicles would access this on-ramp at Semiconductor Drive from the project site via an access agreement. The applicant would lengthen the deceleration and acceleration lanes at the Central Expressway driveway ramps due to the new project trip demands on Central Expressway.

The project would comply with LSAP policies regarding site design, which require development under the LSAP to be compatible with their surroundings. Development on the Extension Site for the parking garage would adhere to City of Santa Clara City Code Chapter 18.74 for driveway parking access standards, including sight distance standards. The project would not result in new significant impacts or substantially more severe impacts related to a hazardous design feature than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to a hazardous design feature than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to hazardous design features the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid. This impact would remain less than significant with implementation of adopted LSAP Update SEIR Mitigation Measure 3.14-7. d) Result in inadequate emergency access?
As determined in the LSAP Update SEIR the ISI Project would provide additional vehicular access points for emergency services. All drive aisles on the ISI Project would be at least 20 feet wide for emergency access. The project would include changes to the geometry of the signalized intersection at 945 Kifer Road , in the City of Sunnyvale, to accommodate the proposed private parking garage. During construction the applicant would implement a construction traffic plan that would ensure no interruption to emergency access in the area during construction in the intersection. The intersection updates would comply with City standards and LSAP policies regarding site design, which require development under the LSAP to be compatible with their surroundings. Site design policies in the LSAP would ensure adequate space and access for emergency vehicles. The Central Expressway deceleration/acceleration lane improvements would comply with Santa Clara County Roads and Airports standards.

Additionally, in accordance with City of Santa Clara City Code Section 15.60.150 development on the Extension Site Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-98 Intuitive North Site Modification Project Environmental Checklist would be required to adhere to the City’s emergency access standards. The project would not result in new significant impacts or substantially more severe impacts related to emergency access than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to emergency access than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to emergency access the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Mitigation Measures from LSAP Update EIR
Mitigation Measure 3.14-7 was adopted as part of the LSAP Update SEIR to require preparation and implementation of a temporary traffic control plan. The following adopted mitigation measure referenced in the LSAP Update SEIR analysis and would continue to be applicable for the North Site if the project was approved. ISI has also agreed to implement this mitigation measure for offsite roadway improvements associated with the Extension Site in a letter dated December 20, 2023 and as included on the project site plans.

Mitigation Measure 3.14-7: Prepare and Implement a Temporary Traffic Control Plan for the ISI Project Before construction or issuance of building permits, the developer or the construction contractor for the ISI project shall prepare a temporary traffic control plan (TTC) to the satisfaction of the City of Sunnyvale Division of Transportation and Traffic and subject to review by all affected agencies. The TTC shall include all information required on the City of Sunnyvale TTC Checklist and conform to the TTC Guidelines of the City of Sunnyvale. At a minimum, the plan shall include the following elements:
 provide vicinity map including all streets within the work zone properly labeled with names, posted speed limits and north arrow;
 provide existing roadway lane and bike lane configuration and sidewalks where applicable including dimensions;  description of proposed work zone;
 description of detours and/or lane closures (pedestrians, bicyclists, vehicular);  description of no parking zone or parking restrictions;  provide appropriate tapers and lengths, signs, and spacing;  provide appropriate channelization devices and spacing;  description of buffers;
 provide work hours/work days;
 dimensions of above elements and requirements per latest CA—MUTCD Part 6 and City of Sunnyvale’s SOP for bike lane closures;
 provide proposed speed limit changes if applicable;
 description of bus stops, signalized and non-signalized intersection impacted by the work;  show plan to address pedestrians, bicycle and ADA requirement throughout the work zone per CA -MUTCD Part 6 and City of Sunnyvale’s SOP for Bike lane closures;
 indicate if phasing or staging is requested and duration of each;  description of trucks, including number and size of trucks per day, expected arrival/departure times, truck circulation patterns;
 provide all staging areas on the project site; and
Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-99  ensure that the contractor has obtained and read the City of Sunnyvale’s TTC Guidelines and City of Sunnyvale’s SOP for bike lane closures; and
 ensure traffic impacts are localized and temporary.

Conclusion
No new circumstances or project changes related to transportation have occurred that would result in new or substantially more severe transportation impacts than were identified in the LSAP Update SEIR, nor is there new information of substantial importance that shows the project will have one or more significant effects not previously discussed or that the discussed effects would be substantially more severe or there would be newly feasible mitigation measures or alternatives or substantially different mitigation measures or alternatives that would substantially reduce impacts but that ISI declines to adopt. Therefore, the findings of the certified LSAP Update SEIR remain valid, and no additional analysis is required.

Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-100 Intuitive North Site Modification Project Environmental Checklist

4.18 TRIBAL CULTURAL RESOURCES
Environmental Issue Area
Where Impact Was
Analyzed in the
LSAP Update Draft
and Final SEIR.

Do Project Changes
Involve New or
Substantially More
Severe Significant
Impacts?
Do Any New
Circumstances Involve
New or Substantially
More Severe
Significant Impacts?
Any New
Information of
Substantial
Importance?
Do Prior Environmental
Documents Mitigations
Address/Resolve
Impacts?

18. Tribal Cultural Resources.

Would the project cause a substantial adverse change in the significance of a tribal cultural resource, defined in Public Res ources Code section 21074 as either a site, feature, place, cultural landscape that is geographically defined in terms of the size and scope of the landscape, sacred place, or object with cultural value to a California Native American tribe, and that is:
a) Listed or eligible for listing in the California
Register of Historical Resources, or in a local
register of historical resources as defined in
Public Resources Code section 5020.1(k)?
Draft SEIR pages

3.3-4 and

3.3-5
No No No NA, there would be
no impact.
b) A resource determined by the lead agency,
in its discretion and supported by substantial
evidence, to be significant pursuant to
criteria set forth in subdivision (c) of Public
Resources Code Section 5024.1. In applying
the criteria set forth in subdivision (c) of
Public Resource Code Section 5024.1, the
lead agency shall consider
the significance of
the resource to a California Native American
tribe?
Draft SEIR pages

3.3-4 and

3.3-5
No No No NA, there would be
no impact.

4.18.1 Discussion
Would the project cause a substantial adverse change in the significance of a tribal cultural resource, defined in Public Resources Code section 21074 as either a site, feature, place, cultural landscape that is geographically defined in terms of the size and scope of the landscape, sacred place, or object with cultural value to a California Native American tribe, and that is:
a) Listed or eligible for listing in the California Register of Historical Resources, or in a local register of historical resources as defined in Public Resources Code section 5020.1(k)?
North Site
The project was subject to AB 52 when the LSAP Update SEIR was published. Because no potential tribal cultural resources were identified, the LSAP Update SEIR did not evaluate impacts related to tribal cultural resources as a separate section in the SEIR. Letters were mailed to 12 tribes on January 11, 2019, inviting them to request consultation under AB 52. Two responses were received, but the responding tribes declined consultation and did not have any comments. The LSAP Update SEIR concluded that because the ISI Project site is already developed, it is unlikely that tribal cultural resources are present. Adopted LSAP Mitigation Measure 3.10.2 requires text to be included on project plans regarding the steps to be taken should construction crews discover archaeological resources or human remains during project construction. These steps would also protect previously undiscovered tribal cultural resources during construction, though the presence of tribal cultural resources in the area is unlikely.

Updates to the North Site would include refinements to the design of the North Site building to ensure consistency with the building on the South Site. The project would not include any changes in the number of employees, density, Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-101 floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR. The portion of the project on the North Site would occur within the area as analyzed in the LSAP with a similar project footprint. The North Site contains no recorded archaeological resources and would be subject to adopted LSAP Mitigation Measure MM 3.10.2 to protect unanticipated cultural resources. Therefore, the portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to tribal cultural resources than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to a tribal cultural resource3 than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to tribal cultural resources the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid. This impact would remain less than significant with implementation of adopted LSAP Update SEIR Mitigation Measure MM 3.10.2.

Extension Site
The Extension Site would be located in an area of the City of Santa Clara that is already developed. Therefore, it is unlikely that tribal cultural resources are present on the site. ISI has agreed to implement LSAP Mitigation Measure

3.10.2 on the Extension Site. If unanticipated cultural resources are discovered on the project site and determined to be Native American remains or resources the project would adhere to LSAP Mitigation Measure MM 3.10.2 and state regulations that would require coordination with the NAHC and proper treatment of tribal cultural resources. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to tribal cultural resources than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to a tribal cultural resource3 than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to tribal cultural resources the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid. This impact would remain less than significant with implementation of adopted LSAP Update SEIR Mitigation Measure MM 3.10.2.
b) A resource determined by the lead agency, in its discretion and supported by substantial evidence, to be significant pursuant to criteria set forth in subdivision (c) of Public Resources Code Section 5024.1. In applying the criteria set forth in subdivision (c) of Public Resource Code Section 5024.1, the lead agency shall consider the significance of the resource to a California Native American tribe? See analysis under item a) above.

Mitigation Measures from LSAP Update EIR
Mitigation Measures MM 3.10.2 was adopted as part of the LSAP EIR to ensure proper treatment of unknown tribal cultural resources. The following adopted mitigation measure referenced in the LSAP EIR and LSAP Update SEIR analysis and would continue to be applicable for the North Site if the project was approved. ISI has agreed to implement these mitigation measures on the Extension Site in a letter dated December 20, 2023 and as included on the project site plans.

Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-102 Intuitive North Site Modification Project Environmental Checklist Mitigation Measure MM 3.10.2
All subsequent projects within the LSAP plan area shall be required to include information on the improvement plans that if, during the course of grading or construction cultural resources (i.e., prehistoric or historic sites) are discovered , work will stop in that area and within 100 feet of the find until a qualified archaeologist can access the significance of the find and, if necessary, develop appropriate treatment measures as part of a treatment plan in consultation with the City and all other appropriate agencies. The treatment plan shall include measures to document and protect the discovered resource. Consistent with CEQA Guidelines Section 15126.4 (b)(3), preservation in place will be the preferred method of mitigating impacts to the discovered resource. Pursuant to Government Code Section 6254.10, information on the discovered resource shall be confidential.

Conclusion
No new circumstances or project changes related to tribal cultural resources have occurred that would result in new or substantially more severe tribal cultural resources impacts than were identified in the LSAP Update SEIR, nor is there new information of substantial importance that shows the project will have one or more significant effects not previously discussed or that the discussed effects would be substantially more severe or there would be newly feasible mitigation measures or alternatives or substantially different mitigation measures or alternatives that would substantially reduce impacts but that ISI declines to adopt. Therefore, the findings of the certified LSAP Update SEIR remain valid, and no additional analysis is required.

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-103

4.19 UTILITIES AND SERVICE SYSTEMS
Environmental Issue Area
Where Impact Was
Analyzed in the
LSAP Update Draft
and Final SEIR.

Do Project Changes
Involve New or
Substantially More
Severe Significant
Impacts?
Do Any New
Circumstances Involve
New or Substantially
More Severe
Significant Impacts?
Any New
Information of
Substantial
Importance?
Do Prior
Environmental
Documents
Mitigations
Address/Resolve
Impacts?

19. Utilities and Service Systems. Would the project:
a) Require or result in the relocation or
construction of construction of new or
expanded water, wastewater treatment or
stormwater drainage, electric power,
natural gas, or telecommunication facilities,
the construction or relocation of which
could cause significant environmental
effects?
Draft SEIR
Impacts 3.15-2,

3.15-4, 3.15-5,
and 3.15-7
No No No NA, impact
would be less
than significant
b) Have insufficient water supplies available to
serve the project and reasonably
foreseeable future development during
normal, dry and multiple dry years?
Draft SEIR
Impact 3.15-1
No No No NA, impact
would be less
than significant
c) Result in a determination by the wastewater
treatment provider that serves or may serve
the project that it has inadequate capacity
to serve the project’s projected demand, in
addition to the provider’s existing
commitments?
Draft SEIR
Impacts 3.15-3
and

3.15-4
No No No NA, impact
would be less
than significant
d) Generate solid waste in excess of State or
local standards, or in excess of the capacity
of local infrastructure, or otherwise impair
the attainment of solid waste reduction
goals?
Draft SEIR
Impact 3.15-6
No No No NA, impact
would be less
than significant
e) Fail to comply with federal, state, and local
management and reduction statutes and
regulations related to solid waste?
Draft SEIR
Impact 3.15-6
No No No NA, impact
would be less
than significant

4.19.1 Discussion
As addressed in the LSAP Update SEIR, the LSAP contributions to water demand and wastewater are anticipated to be accommodated with existing infrastructure facilities. The LSAP Draft EIR acknowledges that there may be some future need to upgrade infrastructure within the LSAP area. The LSAP Update identified the following wastewater facility improvements as part of a sewer impact fee for the area:
 upsizing of the existing 10-inch vitrified clay pipe (VCP) sewer main in San Zeno Way to a 12-inch PVC sewer main;
 upsizing of the existing 10-inch VCP sewer main at the intersection of Willow Avenue and Aster Avenue to an 18-inch PVC sewer main; and
 upsizing of the existing 27-inch VCP sewer main in Lawrence Expressway to a 30-inch PVC sewer main.

The LSAP Update SEIR evaluated the environmental impacts of these improvements and concluded that they would be less than significant.

Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-104 Intuitive North Site Modification Project Environmental Checklist The environmental effects to electrical and natural gas facilities from the ISI Project were considered in the technical analyses of the LSAP Update SEIR. The LSAP Update SEIR determined that buildout of the LSAP would not specifically trigger the need for off-site energy facility improvements, and no large-scale plan area improvements are anticipated.

Cumulative development in Sunnyvale, including in the LSAP, would result in a net additional water demand of 2,274 acre feet per year (AFY). The LSAP Update WSA identified that the LSAP Update would increase water demand to 1,501 AFY, an increase of 688 AFY over the 813 AFY assumed in the LSAP EIR. The LSAP Update Draft SEIR tables 3.15-3, 3.15- 4, and 3.15-5 identify LSAP Update water demands as well as the proposed Downtown Specific Plan Amendment Project water demands on City water supplies under normal, single dry, multiple dry year conditions between 2020 and 2040. Under all scenarios, the City has adequate water supply to accommodate the increase in demand from the LSAP Update. The ISI Project falls within the remaining allowable net new Office/R&D development cap of the LSAP and therefore the LSAP Update SEIR determined there is sufficient water to supply to serve the ISI Project.

The LSAP Update SEIR identified an additional increase of 0.96 million gallons per day of wastewater flows from the LSAP Update, including the ISI Project, in daily flows to the Water Pollution Control Master Plan that would still be well below permitted capacity (LSAP Update Draft SEIR page 3.15-23). Further, compliance with water conservation efforts (e.g., General Plan Policy EM-2.1 and CAP Measure WC-2) would help reduce indoor water use and the amount of wastewater requiring treatment. In the LSAP Draft EIR, the City identified that wastewater flows actually declined from 2006-2015, representing a 10 year trend despite increases in population and an influx of daytime workers.

The LSAP Update SEIR determined that because development of the ISI Project would fall within the remaining allowable net new Office/R&D in the LSAP development of the ISI Project would not exceed the disposal of 19.6 tons per day or 32,500 cubic yards per year estimated for the LSAP.

The City’s NPDES permit was updated in February 2020; effluent amount and requirements are regulated by the San Francisco Bay Regional Water Quality Control Board under Order No. R2-2020-0002 (NPDES permit number CA0037621).

The permitted values contained in the new permit are similar to those in the prior permit which expired in 2019.

Water service in the City of Santa Clara is provided by the City of Santa Clara Department of Water and Sewer Utilities. The City obtains water from Valley Water, Hetch Hetchy, groundwater, and recycled water. Santa Clara operates 26 wells that provide water from underground aquifers resulting in 60 percent of the City’s potable water supply. The water recharge program from local reservoirs, plus imported water enhance the dependability of the underground aquifer system. The remaining supply is imported water. . The City of Santa Clara maintains a municipal storm drainage system that eventually discharges to the Guadalupe River and into the San Francisco Bay. a) Require or result in the relocation or construction of construction of new or expanded water, wastewater treatment or stormwater drainage, electric power, natural gas, or telecommunication facilities, the construction or relocation of which could cause significant environmental effects?
Wastewater and Water Treatment Facilities
The project would remove the approved underground parking on the North Site and relocate this parking to a new above-grade parking structure on the adjacent site to the east, include minor architectural changes to the approved north building, lengthen acceleration/deceleration lanes on Central Expressway, and have a different geometry for the approved private driveway leading to the loading area and new garage. The project would not result in any changes in the floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR that would trigger new utility infrastructure impacts. The proposed parking garage in the City of Santa Clara would require minimal water to maintain landscaping, including the proposed trees to be planted on the Extension Site. Landscaping would include drought tolerant plants with water- efficient landscaping and irrigation. The parking garage would not increase impervious surfaces and is not a use that generates wastewater (i.e., would not contain bathrooms). As the water and wastewater anticipated for the project in the City of Santa Clara would be minimal the City would have sufficient infrastructure to serve the project. Construction or expansion of existing water and wastewater system would not be required. Therefore, the project would not increase demand for wastewater or water treatment beyond what was analyzed in the LSAP Update SEIR. The environmental effects of Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-105 construction and operation of water and wastewater facilities as part of the ISI Project have been considered in the technical analyses of the LSAP Update SEIR and the infrastructure impact study prepared for the ISI Project that determined no new construction of waste and wastewater facilities would be needed . As included in the study the ISI Project would not require expansion of storm drain systems, sanitary sewer system, and potable water system. .

Electrical and Natural Gas Facilities
North Site
PG&E currently provides electrical and natural gas services to Sunnyvale and would continue to provide these services to future development resulting from projects developed in the LSAP. In additional to PG&E the City of Sunnyvale as is a member of SVCE, which serves as the CCA for its member jurisdictions. SVCE works in partnership with PG&E to deliver low-GHG electricity to customers within its member jurisdictions. Consistent with state law, all electricity customers in the city of Sunnyvale were automatically enrolled in SVCE; however, customers can choose to opt out and be served by PG&E. PG&E supplies natural gas service to the City of Sunnyvale through state- regulated public utility contracts. PG&E is required by the California Public Utilities Commission (CPUC) to update the existing systems to meet any additional demand. PG&E builds new infrastructure on an as-needed basis.

The project would remove the approved underground parking on the North Site and relocate this parking to a new above-grade parking structure on an adjacent site to the east, include minor architectural changes to the approved north building, and a different geometry for the approved private driveway leading to the loading area and new garage.

The project would not result in any increases in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR. Because the project would relocate the previously approved parking to an adjacent site in the City of Santa Clara electrical services from SVP would be reduced as compared to the LSAP SEIR. The project would not increase demand for electrical facilities and would not use natural gas. Therefore, the portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to new utilities than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to new utilities than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to new utilities the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Extension Site
SVP provides electricity services to the City of Santa Clara and natural gas is provided by PG&E. PG&E and SVP are required by the California PUC to update the existing systems to meet any additional demand. The project would include a parking garage in the City of Santa Clara. The parking garage would require electricity for lighting and electric vehicle charging, as analyzed in Section 4.6, “Energy.” The Extension Site would connect to existing electrical distribution facilities available at the site and would not require new or expanded electrical facilities. As discussed in Section 4.6, “Energy, the Extension Site would require minimal energy and would not result in a wasteful or inefficient use of energy that might require new or expanded facilities. Impacts would remain less than significant. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to new utilities than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to new utilities than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to new utilities the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt.

The findings of the LSAP Update SEIR for the ISI Project remain valid.

Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-106 Intuitive North Site Modification Project Environmental Checklist Stormwater Drainage Facilities
See analysis under 3.10, “Hydrology and Water Quality,” for a discussion of storm drainage impacts. The project includes on-site drainage improvements such as biotreatment ponds and flow through planters (see project design plans– sheets C4-200A through C4-200B and C4-500 through C4-601, Appendix A). The project applicant completed a preliminary Stormwater Management Plan for the Extension Site project that outlines the drainage areas and proposed treatment control measures. The project would not cause an increase in stormwater from the project site and no offsite drainage improvements are proposed for the project. Therefore, no impact would occur in this regard.

The project would not result in new significant impacts or substantially more severe impacts related to stormwater drainage than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to stormwater drainage than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to stormwater drainage the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid. b) Have insufficient water supplies available to serve the project and reasonably foreseeable future development during normal, dry and multiple dry years? North Site
The project would remove the approved underground parking on the North Site and relocate this parking to a new above-grade parking structure on an adjacent site to the east in Santa Clara. Therefore, the project would not result in any changes in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR that would create additional water supply demand. Therefore, the portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to water supply than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to water supply than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to water supply the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously foun d to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

This impact would remain less than significant.

Extension Site
The City of Santa Clara updated their Urban Water Management Plan (UWMP) in 2020, which estimates sufficient water supply to meet demand in the City through 2045 during normal, single dry, and multi ple dry years that could accommodate the Extension Site (City of Santa Clara 2021). The proposed parking garage would have minimal water demand, with water needed just for landscaping. The incremental increase in water demand from the portion of the project on the Extension Site would be within the water demand anticipated for permitted development on the 2900 Semiconductor site. Therefore, there would be sufficient supply available to serve the parking garage. I mpacts would remain less than significant. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to water supply than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to water supply than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to water supply the project would have one or more significant effects not discuss ed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-107 to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid. c) Result in a determination by the wastewater treatment provider that serves or may serve the project that it has inadequate capacity to serve the project’s projected demand, in addition to the provider’s existing commitments? North Site
The project would relocate the approved underground parking on the North Site to a new above-grade parking structure on an adjacent site to the east. The project would not result in any changes in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR that would create additional wastewater treatment capacity demand. Therefore, the portion of the project on the North Site would not result in new significant impacts or substantially more severe impacts related to wastewater than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to wastewater than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to wastewater the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt.

The findings of the LSAP Update SEIR for the ISI Project remain valid. This impact would remain less than significant.

Extension Site

The proposed parking garage would not generate wastewater. There would be no impacts to wastewater in the City of Santa Clara. The portion of the project on the Extension Site would not result in new significant impacts or substantially more severe impacts related to wastewater than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to wastewater than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to wastewater the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid . d) Generate solid waste in excess of State or local standards, or in excess of the capacity of local infrastructure, or otherwise impair the attainment of solid waste reduction goals?
The project would relocate the approved underground parking on the North Site to a new above-grade parking structure on an adjacent site to the east. Construction of the above ground parking garage would not alter construction solid waste or disposal in landfills as the parking garage would be of a similar size as previously proposed and would require excavation for undergrounding. The project would not result in any changes in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR that would generate additional solid waste. Solid waste generation from development of the parking garage on the Extension Site would be minimal and was accounted for as part of the overall ISI Project since the parking garage would be similar in size to the garage previously assumed .

The project would comply with the City of Santa Clara construction debris diversion ordinance and state diversion requirements of AB 341 to reduce solid waste. Santa Clara has capacity for the minimal waste that would be generated by the proposed parking garage on the Extension Site and would meet solid waste reduction goals. The project would not result in new significant impacts or substantially more severe impacts related to solid waste than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to solid waste than were identified for the ISI Project in the LSAP Update Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-108 Intuitive North Site Modification Project Environmental Checklist SEIR, and no new information shows that as to solid waste the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.
e) Fail to comply with federal, state, and local management and reduction statutes and regulations related to solid waste?
As discussed in Impact 3.11.7.2, Sunnyvale had a waste diversion rate of 66 percent as of 2011, and under current methods for tracking progress with AB 939, the per capita disposal rates are less than the targets. The City has developed its Zero Waste Strategic Plan, intended to identify the new policies, programs, and infrastructure that are intended to move the City toward its Zero Waste goals of 75 percent diversion by 2020 and 90 percent diversion by 2030. According to the latest Sunnyvale Materials Recovery and Transfer Station (SMaRT Station) report from 2018-2019, approximately 67,734 pounds (lbs) out of 149,245 lbs of solid waste from Sunnyvale residents was diverted from landfills, which represents a diversion rate of approximately 60 percent (City of Sunnyvale 2020). Additionally, the City of Sunnyvale committed to the waste reduction programs, plans, and policies that would apply to new development in the LSAP.

The City of Santa Clara requires applicants seeking construction or demolition permits for projects greater than 5,000 square feet to track and divert a minimum of 65 percent of construction waste through their Construction and Demolition Debris Ordinance. Additionally, in compliance with SB 1383, the City recycles 75 percent of organics.

The project would remove the approved underground parking on the North Site and relocate this parking to a new above-grade parking structure on an adjacent site to the east. Therefore, the project would not result in any changes in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR would generate additional solid waste. The portion of the project on the Extension Site would be required to adhere to the City of Santa Clara’s recycling and reuse of materials ordinances to reduce landfill disposal. The project would not result in new significant impacts or substantially more severe impacts related to solid waste than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to solid waste than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to solid waste the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Mitigation Measures from LSAP Update EIR
No mitigation measures were identified in the certified LSAP EIR and LSAP Update SEIR regarding utilities or energy, nor are any additional mitigation measures required for the project.

Conclusion
No new circumstances or project changes related to utilities and service systems have occurred that would result in new or substantially more severe utilities and service systems impacts than were identified in the LSAP Update SEIR, nor is there new information of substantial importance that shows the project will have one or more significant effects not previously discussed or that the discussed effects would be substantially more severe or there would be newly feasible mitigation measures or alternatives or substantially different mitigation measures or alternatives that would substantially reduce impacts but that ISI declines to adopt. Therefore, the findings of the certified LSAP Update SEIR remain valid, and no additional analysis is required.

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-109

4.20 WILDFIRE
Environmental Issue Area
Where Impact Was
Analyzed in the
LSAP Update Draft
and Final SEIR.

Do Project Changes
Involve New or
Substantially More
Severe Significant
Impacts?
Do Any New
Circumstances
Involve New or
Substantially More
Severe Significant
Impacts?
Any New
Information of
Substantial
Importance?
Do Prior
Environmental
Documents Mitigations
Address/Resolve
Impacts?

20. Wildfire.

Is the project located in or near state responsibility areas or lands classified as high fire hazard severity zones? If located in or near state responsibility areas or lands classified as very high fire hazard severity zones, would the proje ct:
a) Substantially impair an adopted
emergency response plan or emergency
evacuation plan?
Draft SEIR
Section 1.3.3
No No No NA, there would
be no impact
b) Due to slope, prevailing winds, and other
factors, exacerbate wildfire risks, and
thereby expose project occupants to
pollutant concentrations from a wildfire
or the uncontrolled spread of a wildfire?
Draft SEIR
Section 1.3.3
No No No NA, there would
be no impact
c) Require the installation of associated
infrastructure (such as roads, fuel breaks,
emergency water sources, power lines or
other utilities) that may exacerbate fire
risk or that may result in temporary or
ongoing impacts to the environment?
Draft SEIR
Section 1.3.3
No No No NA, there would
be no impact
d) Expose people or structures to significant
risks, including downslope or downstream
flooding or landslides, as a result of
runoff, post-fire slope instability, or
drainage changes?
Draft SEIR
Section 1.3.3
No No No NA, there would
be no impact

4.20.1 Discussion
The LSAP Update SEIR analyzed wildfire impacts in Section 1.3, “Effects Found Not to be Significant.” As described on page 1-3 of the Draft SEIR, No Fire Hazard Severity Zones, state responsibility areas, Very High Fire Hazard Severity Zones, or local responsibility areas are located in or adjacent to Sunnyvale. Given that the city is urbanized and not adjacent to large areas of open space or agricultural lands that are subject to wildland fire hazards, no impacts associated with exposure to wildland fire would occur.
a) Substantially impair an adopted emergency response plan or emergency evacuation plan?
See Section 4.9, “Hazards and Hazardous Materials,” item f). b) Due to slope, prevailing winds, and other factors, exacerbate wildfire risks, and thereby expose project occupants to pollutant concentrations from a wildfire or the uncontrolled spread of a wildfire?
As described on page 1-3 of the LSAP Draft SEIR, No Fire Hazard Severity Zones, state responsibility areas, Very High Fire Hazard Severity Zones, or local responsibility areas are located in or adjacent to Sunnyvale . Given that the city of Sunnyvale and city of Santa Clara is urbanized and not adjacent to large areas of open space or agricultural lands that are subject to wildland fire hazards, no impacts associated with exposure to wildland fire would occur.

Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-110 Intuitive North Site Modification Project Environmental Checklist The project site, including the North Site and Extension Site, is surrounded by urbanized uses and would not be subject to wildland fire risks. No impact would occur for the North Site and Extension Site. The project would not result in new significant impacts or substantially more severe impacts related to wildfire than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts related to wildfire than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that as to wildfire the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.
c) Require the installation of associated infrastructure (such as roads, fuel breaks, emergency water sources, power lines or other utilities) that may exacerbate fire risk or that may result in temporary or ongoing impacts to the environment? See analysis for item b) above.
d) Expose people or structures to significant risks, including downslope or downstream flooding or landslides, as a result of runoff, post-fire slope instability, or drainage changes?
See Section 4.9, “Hazards and Hazardous Materials,” item g).

Mitigation Measures from LSAP Update EIR
No mitigation measures were identified in the certified LSAP EIR and LSAP Update SEIR regarding wildfire, nor are any additional mitigation measures required for the project.

Conclusion
No new circumstances or project changes related to wildfire have occurred that would result in new or substantially more severe wildfire shows the project will have one or more significant effects not previously discussed or that the discussed effects would be substantially more severe or there would be newly feasible mitigation measures or alternatives or substantially different mitigation measures or alternatives that would substantially reduce impacts but that ISI declines to adopt. Therefore, the findings of the certified LSAP Update SEIR remain valid, and no additional analysis is required.

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-111

4.21 MANDATORY FINDINGS OF SIGNIFICANCE
Environmental Issue Area
Where Impact Was
Analyzed in the
LSAP Update Draft
and Final SEIR.

Do Project Changes
Involve New or
Substantially More
Severe Significant
Impacts?
Do Any New
Circumstances Involve
New or Substantially
More Severe
Significant Impacts?
Any New
Information of
Substantial
Importance?
Do Prior Environmental
Documents Mitigations
Address/Resolve
Impacts?

21. Mandatory Findings of Significance.
a) Does the project have the potential to
degrade the quality of the environment,
substantially reduce the habitat of a fish or
wildlife species, cause a fish or wildlife
population to drop below self-sustaining
levels, threaten to eliminate a plant or animal
community, substantially reduce the number
or restrict the range of an endangered, rare
or threatened species or eliminate important
examples of the major periods of California
history or prehistory?
Draft SEIR
Section 3.3,
Cultural and
Tribal Cultural
Resources, and
Section 3.4,
Biological
Resources
No No No Yes, impacts would
remain less than
significant with the
application of the
adopted mitigation
measures.
b) Does the project have impacts that are
individually limited, but cumulatively
considerable? (“Cumulatively considerable”
means that the incremental effects of a
project are considerable when view in
connection with the effects of past projects,
the effects of other current projects, and the
effects of probable future projects)?
Draft SEIR pages
4-21 and 4-22;
Impact 4-22
No No No Yes, impacts would
remain less than
significant with the
application of the
adopted mitigation
measure except for
Impact 4-3
(Cumulative Air
Quality) and Impact
4-22 (Cumulative
Wastewater Service
Impacts) that would
remain cumulatively
considerable and
significant and
unavoidable. The
project would not
make a cumulatively
considerable
contribution to
these impacts.
c) Does the project have environmental effects
which will cause substantial adverse effects
on human beings, either directly or
indirectly?
Draft SEIR
Sections 3.2, Air
Quality; 3.8,
Hazards and
Hazardous
Substances; and

3.11, Noise and
Vibration
No No No Yes, impacts would
remain less than
significant with the
application of the
adopted mitigation
measure, but for air
quality as the LSAP
Update SEIR impact
would remain
significant and
unavoidable for
construction and
less than significant
for operation.

Attachment 13

Environmental Checklist Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
4-112 Intuitive North Site Modification Project Environmental Checklist

CONCLUSION
The project site is developed and the project would not degrade the quality of the environmental for biological resources or eliminate examples of California history or prehistory.

The LSAP Update SEIR identified significant cumulative impacts to construction air quality emissions. As discussed in Section 4.3, the project would result in slightly reduced construction emissions as compared to development on the North Site analyzed in the LSAP Update SEIR because the project would not include emissions associated with hauling materials for the underground parking garage. However, the project’s contribution to emissions would remain cumulatively considerable as concluded in the LSAP Update SEIR. The LSAP Update SEIR identified a new cumulatively considerable and significant and unavoidable impact associated with cumulative wastewater services .

The LSAP Update SEIR specified that there would not be sufficient planned capacity at the Donald M. Somers Water Pollution Control Plan ( WPCP) to treat wastewater generated by the ISI Project due to a net increase in wastewater from all the development that would be implemented under the LSAP Update. Updates to the North Site would include refinements to the design of the North Site building to ensure consistency with the building on the South Site. The project would not include any increases in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit and analyzed in the LSAP Update SEIR that would create additional wastewater demand. The North Site updates would therefore not result in the generation of additional wastewater beyond what was already analyzed in the LSAP Update SEIR. Development on the Extension Site, furthermore, would include construction, demolition, and landscaping activities for the proposed above-ground parking garage. The proposed parking garage would not generate wastewater. Therefore, the project would not generate additional need for wastewater treatment beyond what was analyzed in the LSAP Update SEIR.

All approved mitigation in the LSAP Update SEIR would continue to be implemented with the proposed project, as indicated in this checklist.

The project’s contribution to other environmental issue areas discussed in this checklist would remain less than cumulatively considerable because the project would not include any changes in the number of employees, density, floor area ratio, or square footage of buildings approved by the ISI Special Development Permit as analyzed in the LSAP Update SEIR.

Impacts to human beings from projects are associated with many of the areas analyzed pursuant to Appendix G of the CEQA Guidelines, including air quality, climate change, hazards and hazardous materials, geology and soils, noise, traffic safety, water quality, and wildfires. With the implementation of applicable mitigation measures for air quality, hazardous materials, and noise the project would not result in a new or substantially more severe adverse effect on human beings from impacts disclosed for the ISI Project in the LSAP Update SEIR and would not alter the conclusions for the ISI Project in the LSAP Update SEIR. Therefore, the project would not result in new significant impacts or substantially more severe impacts than were identified for the ISI Project in the LSAP Update SEIR, no changes in circumstances would result in new or substantial more severe impacts than were identified for the ISI Project in the LSAP Update SEIR, and no new information shows that the project would have one or more significant effects not discussed in the LSAP Update SEIR for the ISI Project, significant effects previously examined would be substantially more severe than shown in the LSAP Update SEIR for the ISI Project, or that there would be feasible mitigation measures or alternatives that were previously found to be infeasible or that are considerably different than measures in the LSAP Update SEIR for the ISI Project that reduce impacts but that ISI declines to adopt. The findings of the LSAP Update SEIR for the ISI Project remain valid.

Attachment 13

Ascent Administrative Draft – For Internal Review Only Environmental Checklist City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 4-113 This page intentionally left blank.

Attachment 13

Attachment 13

Administrative Draft – For Internal Review Only
City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 5-1 5 LIST OF PREPARERS

5.1 LIST OF PREPARERS
City of Sunnyvale Community Development Department
Julia Klein .................................................................................................................................................................................... Principal Planner George Schroeder ................................................................................................................................................................... Principal Planner Ascent Environmental
Pat Angell ............................................................................................................................................................................. Principal-in-Charge Kari Zajac ................................................................................................................................................................................... Project Manager Dimitri Antoniou ................................................................................................................................................................ Noise Senior Review Julia Wilson ................................................................................................................................. Air Quality/GHG Emission Senior Review Matthew Brehmer ................................................................................................................................................ Air Quality/GHG Emissions Alta Cunningham .................................................................................................................................... Cultural Resources Senior Review Eric Cohen ...................................................................................................................................................................... Environmental Planner Gayiety Lane ....................................................................................................................................................................................... Publications Riley Smith ........................................................................................................................................................................................... Publications Brian Perry .................................................................................................................................................................................................. Graphics

Attachment 13

List of Preparers Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
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Administrative Draft – For Internal Review Only
City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 6-1 6 REFERENCES
ABAG and MTC. See Association of Bay Area Governments and Metropolitan Transportation Commission.

Association of Bay Area Governments and Metropolitan Transportation Commission. 2021 (October). Plan Bay Area 2050. Available: https://www.planbayarea.org/sites/default/files/documents/ Plan_Bay_Area_2050_October_2021.pdf. Accessed: March 20, 2023.

BAAQMD. See Bay Area Air Quality Management District.

Bay Area Air Quality Management District. 2017. 2017 Bay Area Clean Air Plan. Available:
http://www.baaqmd.gov/~/media/files/planning-and-research/plans/2017-clean-air-plan/attachment-a_- proposed-final-cap-vol-1-pdf.pdf?la=en. Accessed: December 6, 2018 ———. 2022. Justification Report: CEQA Thresholds for Evaluating the Significance of Climate Impacts . Available:
https://www.baaqmd.gov/~/media/files/planning-and-research/ceqa/ceqa-thresholds-2022/justification- report-pdf.pdf?la=en. Accessed: March 20, 2023.

California Air Resources Board. 2022a. Ambient Air Quality Standards. Available at https://ww2.arb.ca.gov/sites/default/files/2020-07/aaqs2.pdf. ———. 2022b . Maps of State and Federal Area Designations. Available: https://ww2.arb.ca.gov/resources/documents/ maps-state-and-federal-area-designations. Accessed: March 20, 2023.

California Department of Transportation. 2013. Transportation and Construction Vibration Guidance Manual. Available:

Caltrans-2013-Transportation-and-Construction-Vibration-Guidance-Manual-PDF. Accessed: March 22, 2023.

California Energy Commission. 2022. 2022 Building Energy Efficiency Standards. Available:
https://www.energy.ca.gov/programs-and-topics/programs/building-energy-efficiency-standards/2022- building-energy-efficiency. Accessed: March 20, 2023.

California Geological Survey. 2023a. Earthquake Required Zones of Investigation. Available:
https://maps.conservation.ca.gov/cgs/EQZApp/. Accessed March 25, 2023. ———. 2023b. CGS Information Warehouse: Landslides. Available: s://maps.conservation.ca.gov/cgs/ informationwarehouse/landslides/. Accessed March 25, 2023.

CGS. See California Geological Survey.

CARB. See California Air Resources Board.

CEC. See California Energy Commission.

Cornerstone Earth Group. 2019 (April). Preliminary Geotechnical Investigation: Intuitive Surgical Campus Expansion, 945 and 955 Kifer Road, Sunnyvale, CA.

EPA. See U.S. Environmental Protection Agency.

Far Western Anthropological Research Group, Inc. 2019 (July). Cultural Resources Inventory and Geoarchaeological Assessment Associated with Proposed Construction of New Facilities located at 932 Kifer Road, 945 –955 Kifer Road, and 950 Kifer Road Associated with Intuitive Surgical, Sunnyvale, Santa Clara County, California. ———. 20 23 (April). Cultural Resources Records Search for the 2900 Semiconductor Project, Santa Clara County, California.

Far Western. See Far Western Anthropological Research Group, Inc.

Farallon Consulting. 2021 (January). Vapor Intrusion Assessment Report, 13-Acre Portion of Santa Clara County Assessor’s Parcel No. 205-39-027, Building D, Texas Instruments Campus, 2900 Semiconductor Drive, Santa Clara, CA. Prepared for Intuitive Surgical Operations, Inc. Oakland, CA.

Attachment 13

References Administrative Draft – For Internal Review Only Ascent City of Sunnyvale
6-2 Intuitive North Site Modification Project Environmental Checklist Federal Transit Association. 2018 (September). Transit Noise and Vibration Impact Assessment Manual. FTA Report No. 0123. Washington, D.C. Available: https://www.transit.dot.gov/sites/fta.dot.gov/files/docs/research- innovation/118131/transit-noise-and-vibration-impact-assessment-manual-fta-report-no-0123_0.pdf.

Accessed: March 22, 2023.

FTA. See Federal Transit Association.

Hexagon Transportation Consultants. 2023 (August). ISI North Campus Feasibility Study. San Jose, CA. Prepared for Kier & Wright Civil Engineers & Surveyors, Inc.

Iris Environmental. 2014 (December). Phase I and Limited Phase II Environmental Site Assessment for 945 and 955 Kifer Road. Prepared for Greenberg Traurig LLP, East Palo Alto, California.

Langan Treadwell Rollo. 2014 (October). Soil Management Plan APNs: 205- 38-021, 205-38-008, 205-38-022, 205-39- 025, 205-39-022, and 205-39-018, Santa Clara, California. Prepared for Texas Instruments Incorporated, Santa Clara, California
Metropolitan Transportation Commission. 2018. Priority Development Areas. Available: https://mtc.ca.gov/our - work/plans-projects/focused-growth-livable-communities/priority-development-areas. Accessed January 2023.

Monarch Consulting Arborists. 2022 (May). Tree Inventory, Assessment, and Protection Report. 2900 Semiconductor Drive. Prepared for HGA.

Santa Clara, City of. 2010. City of Santa Clara 2010 – 2035 General Plan. Accessed: March 22, 2023. Available:
https://www.santaclaraca.gov/home/showpublisheddocument/56139/636619791319700000 ———. 2018 (July). Climate Action Plan 2018 Annual Report. Available: https://www.santaclaraca.gov/home/ showpublisheddocument/62433/636809212556470000. Accessed: March 20, 2023. ———. 2020a (September). How to Report Noise Related Matters. Available: https://www.santaclaraca.gov/Home/ Components/News/News/41838/95?npage=5#:~:text=Construction%20Noise,allowed%20on%20Sundays%2 0or%20holidays. Accessed: March 22, 2023.
———. 2020b (June). Vehicle Miles Traveled Transportation Analysis Policy for Environmental Review. Available:
https://www.santaclaraca.gov/home/showpublisheddocument/67648/637251601182730000. Accessed:

February 2023.
———. 2021 (June). City of Santa Clara 2020 Urban Water Management Plan . Available:
https://www.santaclaraca.gov/home/showpublisheddocument/74073/637606452907100000. Accessed February 2023.
———. 2022 (November). Santa Clara City Code, Chapter 9.10 . Available: Chapter 9.10 REGULATION OF NOISE AND VIBRATION (codepublishing.com). Accessed: March 22, 2023.

Sunnyvale, City of. 2016 (May). Lawrence Station Area Plan Draft Environmental Impact Report. Prepared by Michael Baker International, Rancho Cordova, CA.
———. 2018 (July). Climate Action Plan 2018 Biennial Progress Report. Available:
https://www.sunnyvale.ca.gov/home/showpublisheddocument/1316/637820055380570000. Accessed: M arch 20, 2023.
———. 2019a. Sunnyvale’s Climate Action Playbook . Available: https://sunnyvaleclimateaction.org/action- plan#content. Accessed January 2023.
———. 2019b. City of Sunnyvale Hours of Construction. Available:
https://www.sunnyvale.ca.gov/home/showpublisheddocument/3510/637909617637970000. Accessed: March 22, 2023.

Attachment 13

Ascent Administrative Draft – For Internal Review Only References City of Sunnyvale
Intuitive North Site Modification Project Environmental Checklist 6-3 ———. 2020. Transportation Analysis Policy . Council Policy Manual. Available: https://www.sunnyvale.ca.gov/home/ showpublisheddocument/744/637819125762530000. Accessed March 22, 2023. ———. 2021 (May). Lawrence Station Area Plan Update/Intuitive Surgical Corporate Campus Project Draft Environmental Impact Report (State Clearinghouse No. 2091012022). Available:
https://www.sunnyvale.ca.gov/home/showpublisheddocument/1858/637820916092470000 Urban Tree Management. 2015 (May). Tree Survey of 945 Kifer Road, Sunnyvale, CA.

U.S. Environmental Protection Agency. 2024. NAAQS Table. Available: https://www.epa.gov/criteria-air- pollutants/naaqs-table. Accessed: December 5, 2022.
———. 2022 (April). EPA Greenbook. Available: https://www.epa.gov/green- book/green-book-national-area-and- county-level-multi-pollutant-information. Accessed: March 20, 2023.

Attachment 13

References Administrative Draft – For Internal Review Only Ascent C ity of Sunnyvale
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