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IS-MND Errata Sheet - 11-25-25 - 178 Twin Oaks Drive (PDF)Errata Sheet Surrey Farms Estates Subdivision Project November 25, 2025 Page 1 INTRODUCTION This Errata presents, in strike-through and double-underline format, the revisions to the Surrey Farms Estates Subdivision Project Initial Study/Mitigated Negative Declaration (IS/MND). The revisions to the IS/MND reflected in this Errata do not affect the adequacy of the previous environmental analysis contained in the Surrey Farms Estates Subdivision Project IS/MND. Because the changes presented below would not result in any new significant impacts or increase in impact significance from what was identified in the IS/MND, recirculation of the Surrey Farms Estates Subdivision Project IS/MND is not required. CHANGES TO IS/MND The following revision is hereby made to page 16 of the IS/MND: Architecture and Site Plan Review The Town’s Building Division Community Development Department is responsible for a plan review of all new construction, additions, and remodels for both commercial and residential properties, as well as construction inspection services for projects including electrical, plumbing and mechanical installations. Plan review ensures compliance with applicable State and local codes, policies, guidelines, and standards of all residential and commercial structures within the Town limits, including the Hillside Development Standards and Guidelines. As described in the Town’s Code, the purpose of Architecture and Site Plan Review through the Planning Division is to regulate the height, width, shape, proportion, siting, exterior construction and design of buildings to ensure that they are architecturally compatible with their surroundings. Section 29.20.150 of the Town Code lists the matters that the Town must consider when reviewing applications for Architecture and Site Approval. The Town’s review is limited to objective standards only, pursuant to SB 330 and Builder’s Remedy. Mitigation Measure III-1 on page 35 of the IS/MND is hereby revised as follows as part of staff- initiated changes: III-1 The project applicant shall show on Improvement Plans via notation that the project contractor shall restrict the construction of the off-site sidewalk improvements along the north side of Blossom Hill Road between Regent Drive and Union Avenue and along the north side of Fisher Avenue between Mitchell Avenue and Roberts Road from occurring simultaneously with the on-site construction of the proposed project. Alternatively, if simultaneous construction of the on-site and off-site components of the proposed project cannot be avoided, prior to the initiation of ground disturbance associated with the off-site sidewalk improvements, the project applicant shall show on project improvement plans via notation the following requirements: ERRATA SHEET Errata Sheet Surrey Farms Estates Subdivision Project November 25, 2025 Page 2  The contractor shall ensure that all construction equipment greater than 50 horsepower to be used in the construction of the off-site sidewalk improvements, including owned, leased, and subcontractor vehicles, shall be Tier 4 final off-road construction equipment. In addition, all off-road equipment operating at the off- site construction site must be maintained in proper working condition according to manufacturer’s specifications.  Idling shall be limited to five minutes or less in accordance with the In-Use Off-Road Diesel Vehicle Regulation as required by CARB. Clear signage regarding idling restrictions shall be placed at the entrances to the construction site.  Portable equipment over 50 horsepower must have either a valid BAAQMD Permit to Operate (PTO) or a valid statewide Portable Equipment Registration Program (PERP) placard and sticker issued by CARB. Conformance with the foregoing requirements shall be confirmed through review and approval of plans by the Town of Los Gatos Community Development Parks and Public Works Department. Pages 48 and 49 of the IS/MND is hereby revised as follows: The on-site ephemeral drainage with swales was determined not to be considered jurisdictional water of the U.S. or the State. Nonetheless, aAs shown in Figure 3, the proposed project would be designed to incorporate a minimum 10-foot buffer between the proposed development and the vegetation surrounding the ephemeral drainage. As such, the ephemeral drainage with swales would not be directly impacted by the proposed project. Similarly, as discussed above, the proposed project would retain the 100- to 110- foot flood easement between the development footprint and Ross Creek. Therefore, the proposed project would not result in the disturbance of any on-site wetlands. Mitigation Measure IV-9 on page 50 of the IS/MND is hereby revised as follows as part of staff- initiated changes: Mitigation Measure(s) Implementation of the following mitigation measure would reduce the above potential impact to a less-than-significant level. IV-910 Prior to the start of construction activities, the applicant shall comply with the Town of Los Gatos Tree Protection Ordinance and a tree removal permit shall be obtained from the Town for the removal of any on-site trees that qualify as a protected tree. If the trees proposed for removal are found to be in good condition, and the tree removal permit is granted primarily for the convenience of the applicant, then the full cost and responsibility of such removal shall be borne by the applicant, including planting of replacement trees. According to the Tree Mitigation and Protection Plan prepared for the proposed project, the project would not meet the required on-site tree replacement requirement; thus, the project applicant shall pay the appropriate in-lieu fees, pursuant to the requirements of Division II of Chapter 29.10 of the Town’s Municipal Code. The above noted requirements shall be completed to the satisfaction of the Town of Los Gatos Parks and Public Works Department Planning Division. Errata Sheet Surrey Farms Estates Subdivision Project November 25, 2025 Page 3 Page 50 is further revised as follows: As discussed above, mixed oak woodland is present throughout the project site, some of which would be impacted by the proposed development. In order to determine if on-site trees proposed for removal qualify for protection under the provisions of the Town’s Municipal Code, an Arborist Report was prepared for the site by McClintock Landscape Horticultural Services (McClintock) (see Appendix C), which has been peer reviewed by Monarch Consulting Arborists. During a site tree survey conducted of the project site, the Arborist Report identified 603 673 on-site trees measuring four inches or greater in diameter at breast height (DBH), consisting of 26 species. According to the Arborist Report, 546 630 of the on-site trees qualify for protection under the Town’s Tree Protection Ordinance. According to the Tree Mitigation and Protection Plan prepared for the proposed project, 223 protected trees would be removed, which would require a total of 551 replacement trees to be planted on-site, pursuant to the Town of Los Gatos Tree Protection Ordinance. A total of 85 trees are proposed to be planted on-site, which would not meet the on-site tree replacement requirements (see Figure 8 and Figure 9). Thus, payment of in-lieu fees consistent with Division II of Chapter 29.10 of the Town’s Municipal Code would be required to mitigate for the shortfall in on-site tree replacement. Page 70 is hereby revised as follows: g. Issues related to wildfire hazards are discussed in Section XX, Wildfire, of this IS/MND. As noted therein, the project site is not located within a State Responsibility Area (SRA). However, the site is located within a Very High Fire Hazard Severity Zone (FHSZ).1 Mitigation Measure X-1 on page 74 of the IS/MND is hereby revised as follows: X-1 Prior to any ground-disturbing activities, the project applicant shall prepare and submit a final erosion and sediment control plan for review and approval by the Town of Los Gatos Engineering Division of the Parks and Public Works Department. A Notice of Intent (NOI) and Storm Water Pollution Prevention Plan (SWPPP) shall be submitted to the San Francisco Bay Regional Water Quality Control Board. A maximum of two weeks is allowed between clearing of an area and stabilizing/building on an area if grading is allowed during the rainy season. Prior to any ground disturbance, the on-site aquatic features (i.e., the ephemeral drainage/drainage swale and Ross Creek) shall be flagged by a qualified biologist with highly visible flagging tape, or similar, to clearly demarcate the limits of the aquatic features, and interim erosion control measures shall be installed around the aquatic features, at a minimum. The project applicant shall submit a letter to the Town prepared by the qualified biologist confirming completion of the flagging for review and approval prior to commencement of any ground disturbance. Interim erosion control measures, to be carried out during construction and before installation of the final landscaping, shall be included. Interim erosion control methods shall include, but are not limited to: silt fences, fiber rolls (with locations and details), erosion control blankets, Town standard seeding specification, filter berms, check dams, retention basins, etc. The project 1 California Department of Forestry and Fire Protection. Santa Clara County: State Responsibility Area Fire Hazard Severity Zones. Effective April 1, 2024. Errata Sheet Surrey Farms Estates Subdivision Project November 25, 2025 Page 4 contractor shall provide erosion control measures as needed to protect downstream water quality during winter months. The grading, drainage, erosion control plan and SWPPP shall be prepared in compliance with applicable measures contained in the amended provisions C.3 and C.14 of most current Santa Clara County National Pollutant Discharge Elimination System (NPDES) Municipal Regional Permit (MRP). Monitoring for erosion and sediment control is required and shall be performed by the Qualified SWPPP Developer (QSD) or Qualified SWPPP Practitioner (QSP) as required by the Construction General Permit. Stormwater samples are required for all discharge locations and projects may not exceed limits set forth by the Construction General Permit Numeric Action Levels and/or Numeric Effluent Levels. A Rain Event Action Plan (REAP) shall be developed 48 hours prior to any likely precipitation event, defined by a 50 percent or greater probability as determined by the National Oceanic and Atmospheric Administration (NOAA), and/or whenever rain is imminent. The QSD or QSP must print and save records of the precipitation forecast for the project location area from (https://www.cpc.ncep.noaa.gov/) which shall accompany monitoring reports and sampling test data. A rain gauge is required on-site. The Town of Los Gatos Engineering Division of the Parks and Public Works Department and the Building Department shall conduct periodic NPDES inspections of the site throughout the recognized storm season to verify compliance with the Construction General Permit and Stormwater ordinances and regulations. Page 76 of the IS/MND is hereby revised as follows: Furthermore, as discussed above, following project development, stormwater runoff from each on-site DMA would be directed into an associated bioretention area located adjacent to each lot, which would be lined with an impermeable liner. Following on-site treatment, stormwater flows would be metered out into the existing 27- and 36-inch storm drains located north and west of the site, respectively. The proposed on-site stormwater infrastructure would be sized to meet Provision C.3.g of the County’s Municipal Regional Stormwater NPDES permit (MRP), which requires new development to manage stormwater flows such that post-development runoff does not exceed pre-project runoff rates and durations. In order to calculate the project’s ability to meet flow-duration frequency requirements while also meeting the required water quality treatment standards, a Bay Area Hydrology Model (BAHM) report was prepared for the proposed project by Balance Hydrologics.2 As discussed therein, site runoff would be directed to one of nine proposed bioretention basins that provide both water quality treatment and flow-duration control. Each bioretention area has been designed in accordance with the standard design criteria outlined in the C.3 Stormwater Handbook. Specifically, each basin was modeled with six inches of surface ponding, 18 inches of biotreatment soil media, and 12 inches of drain rock. A four-inch underdrain would collect the treated water, which would then be metered through a two- inch orifice integrated into the storm drain overflow structure. The two-inch orifice is required to meet the hydromodification management criteria. The modeling conducted as part of the BAHM report showed that the basins would biofilter an approximate average of 90 percent of the mean annual runoff. Such filtration rates are well in excess of the minimum 80 percent required by the MRP. As such, the BAHM report concluded that the proposed stormwater management facilities would provide effective water-quality 2 Balance Hydrologics. Summary of BAHM Modeling for the Surrey Farm Project, Town of Los Gatos. July 31, 2025. Errata Sheet Surrey Farms Estates Subdivision Project November 25, 2025 Page 5 treatment and flow-duration controls for the full range of flows, from one-tenth of the two- year flood event up to the 10-year event. Based on the above, the proposed project would not substantially alter the existing drainage pattern of the site or area in a manner which would result in erosion, siltation, or flooding on- or off-site, 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. Consequently, implementation of the proposed project would result in a less-than-significant impact. Page 102 of the IS/MND is revised as follows: a-d. According to maps prepared as part of the California Department of Forestry and Fire Protection (CAL FIRE) Fire and Resource Assessment Program, the project site is not located within an SRA; however, the site is located within a Very High FHSZ.3 The project site is currently undeveloped and contains scattered oak woodlands throughout. Development of the proposed residential uses would include the clearing of on-site fuel sources and, thus, is not anticipated to increase wildfire risks at the site relative to the existing conditions within the project site. Additionally, the proposed project would be required to comply with all applicable requirements of the CFC through the installation of fire sprinkler systems, fire hydrants, and other applicable requirements. In addition, the proposed project would be subject to the requirements of Chapter 7A of the CBC which include, but are not limited to, use of ignition-resistant materials, fire-intrusion design of roofing and vents, and use of glazed exterior windows and doors. The proposed project would also be situated near existing roads, water lines, and other utilities, which would reduce risks related to wildfire due to the existing development generally acting as a fuel break because of a lack of natural debris (e.g., vegetation) within developed sites. Wildfire risks are not anticipated to be exacerbated during project operation, as the anticipated residential uses typically do not involve operational components that would increase the risk of wildfire. Development of the site for residential uses would help to reduce the risk of wildland fire in the area due to site improvements, such as roadways, driveways, and irrigated landscaping, which would reduce readily combustible vegetation. Additionally, pursuant to Mitigation Measure VII-1, the project design would be required to show that final grading or improvement plans incorporate all recommendations included within the site-specific GGHI prepared for the proposed project to ensure slope stability at the project site. Furthermore, as shown in Figure 16 of the IS/MND, the proposed project locates the residences outside of the areas of the site with the steepest slopes. Although some slopes occur within the project site, the on-site slopes are limited in size and are not sufficient to facilitate rapid spread of wildfire, as compared to mountainous areas with slopes sufficiently large enough to accommodate rapid spread of wildfire. As a result, the proposed project would not exacerbate wildfire risks due to slope. The off-site improvement areas do not include significant slopes. As discussed in Section IX, Hazards and Hazardous Materials, of this IS/MND implementation of the proposed project would not result in any substantial 3 California Department of Forestry and Fire Protection. Santa Clara County: State Responsibility Area Fire Hazard Severity Zones. Effective April 1, 2024. Errata Sheet Surrey Farms Estates Subdivision Project November 25, 2025 Page 6 modifications to the existing roadway system and, thus, would not physically interfere with the Town’s EOP, particularly with any emergency evacuation routes. Furthermore, the proposed project would not include land uses or operations that could impair implementation of the plan. While the long-term maintenance of the proposed roadways, water and wastewater infrastructure, and other utilities would not exacerbate fire risks, the activities associated with the initial construction and placement of the utilities and infrastructure could cause a temporary increase in fire risks due to the use of heavy equipment, which would contain combustible materials such as fuels, oils, and ignition sources. However, the project contractor would be required to comply with all applicable health and safety standards, including the California Health and Safety Codes and local Town ordinances regulating the handling, storage, and transportation of hazardous materials. Compliance with such standards would help to minimize the potential for accidental conditions, including fire. Additionally, the Santa Clara County Fire Department SCCFD has also adopted Genasys Protect (formerly known as Zonehaven) to provide specific, timely and accurate information regarding evacuations within the County. Genasys Protect divides geographic regions into smaller zones to help simplify evacuations. In the event of a wildfire or public safety emergency, fire department and law enforcement agencies will issue evacuation orders and other protective actions for impacted areas. Genasys Protect is a web-based platform that provides real-time evacuation updates. The project site is located within Zone LGA-008, which includes the area north of Kennedy Road, south of Blossom Hill Road, east of Los Gatos Boulevard, and west of Short Road and Brooke Acres Drive.4 Therefore, the proposed project would not be expected to be subject to or result in substantial adverse effects related to wildfires, and a less-than-significant impact would occur. The above modifications are for clarification purposes only and do not change the analysis or conclusions of the IS/MND. 4 Protect Genasys. Genasys Protect. Available at: https://protect.genasys.com/zones/US-CA-XSC-LGA-008. Accessed May 2025.