PC-2026-08 - Laserfiche WebLink

City of Pleasanton—Hidden Canyon Residences and Preserve Project Responses to Written Comments Final EIR 3-28 FirstCarbon Solutions https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480016/EIR/4 - Final EIR/21480016 Sec03-00 Responses to Written Comments.docx account for approximately 6.01 mgd of the available 8.5 mgd of wastewater treatment capacity from the DSRSD RWTF. Approximately 2.4 mgd of wastewater treatment capacity would be available for other reasonably foreseeable projects within the City. Therefore, the proposed project, in conjunction with identified cumulative projects in the City’s service area, would result in a less than significant cumulative impact related to wastewater generation and wastewater treatment facilities. Moreover, as discussed on page 3-3 in the DSRSD’s Wastewater Treatment & Biosolids Facilities Master Plan, the most recent ADWF expansion project (Stage 4 Improvements Project) provided for the ADWF capacity of 17 mgd mentioned above, as predicted by the previous DSRSD Master Plan.2 Page 2-20 of the Wastewater Treatment & Biosolids Facilities Master Plan states that the projected 2035 influent Biological Oxygen Demand (BOD) and Total Suspended Solids (TSS) flows are less than those that served as the basis for the Stage 4 Improvements Project design. Specifically, the maximum daily load for BOD is 63,200 pounds per day less than what was previously projected and the maximum daily load for TSS is 56,300 pounds per day less than the amount accounted for in the previous ADWF expansion. Moreover, these projections were based on population estimates that included the City. However, the City’s population has decreased compared to the population projection since the creation of DSRSD’s Master Plan in 2017; from approximately 78,800 to approximately 75,664; as noted on page 4-3 of the Draft EIR. As such, there would be capacity to treat approximately 63,200 pounds per day of BOD and 56,300 pounds per day of TSS for the development of the proposed project. In relation to nutrients, agricultural uses are known to directly contribute to the amount of nutrients in water.3 The current project site zoning district is Agriculture, with a portion of the project site being mapped as grazing land. Development of the proposed project would result in the construction of single-family residences and would not include any agricultural uses on the project site. Additionally, DSRSD’s Raw Wastewater Diversion Project would produce recycled water to meet the agency’s irrigation demand and was identified by the San Francisco Bay Regional Water Quality Control Board to significantly reduce total inorganic nitrogen nutrient loads to the San Francisco Bay.4 As noted on page 3.15-16 of the Draft EIR, the proposed project would adhere to the City’s Water Efficient Landscape Program, which requires implementation of outdoor irrigation water conservation measures and practices. This is not anticipated to conflict with DSRSD’s Raw Wastewater Diversion project. Given that agricultural uses are associated with the addition of nutrients into receiving waters, the residential uses anticipated as part of the proposed project are not likely to significantly increase nutrients in wastewater from the project site. This comment is 2 Dublin San Ramon Services District (DSRSD). Wastewater Treatment & Biosolids Facilities Master Plan. Website: https://www.dsrsd.com/files/assets/waterservice/v/1/engineering/documents/master-plans/wastewater-treatment-and-biosolids- facilities-master-plan-september-2017-final.pdf. Accessed February 6, 2026. 3 United States Geological Survey (USGS). Agriculture and the Quality of the Nation’s Waters. Website: https://www.usgs.gov/mission-areas/water-resources/science/agriculture-and-quality-nations-waters#overview. Accessed February 6, 2026. 4 San Francisco Bay Regional Water Quality Control Board (San Francisco Bay RWQCB). Order R2-2024-0013 NPDES Permit CA0038873. Website: https://www.waterboards.ca.gov/sanfranciscobay/board_decisions/adopted_orders/2024/R2-2024-0013.pdf. Accessed February 6, 2026.