RES 211231 Exhibit A - Laserfiche WebLink

City of Pleasanton–10x Genomics Project Environmental Checklist and Initial Study/Mitigated Negative Declaration Environmental Evaluation FirstCarbon Solutions 95 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480024/ISMND/wp/21480024 10x Genomics Project Full Screencheck ISMND.docx temporary erosion controls, sediment control, runoff diversion, vegetative buffers, designated and contained vehicle maintenance areas, training and instruction for employees and subcontractors, and pollutant prevention and control. Additionally, the proposed project would include bioretention areas. According to the Illustrative Storm Water Quality Control Plan prepared for Phase 1 of the proposed project (Appendix G), interceptor trees would be used in combination with bioretention areas for stormwater and pollutant control pursuant to the guidance in the Alameda Countywide Clean Water Program’s C.3 Stormwater Technical Guidance Manual. According to the Guidance Manual, interceptor trees can reduce runoff and pollution by intercepting stormwater and retaining captured water and can be used as part of Storm Water Control Plan (SCP).69 Compliance with the C.3 Permit, the SWPPP, and implementation of BMPs, would ensure that the proposed project would not result in substantial soil erosion that would violate water quality standards or waste discharge requirements or otherwise substantially degrade surface or groundwater quality during the construction or operation of the proposed project. Therefore, impacts 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? Less than significant impact. The proposed project would not result in a net increase of impervious surfaces in areas previously penetrable for groundwater recharge purposes. Furthermore, the proposed project would not require the use of groundwater. The City of Pleasanton has an agreement with Zone 7 that allows the City to pump up to 3,500 acre-feet per year from three groundwater wells owned and operated by the City. Local water is extracted from the Livermore Valley Main Groundwater Basin. The City’s groundwater wells provide about 20 percent of the City’s water supply; the remaining 80 percent is purchased from Zone 7.70 Because the proposed project would not exceed the projected water supplies (see Section 2.18, Utilities and Public Services), the proposed project would not cause overdraft of the groundwater supply. Therefore, the proposed project would not substantially decrease groundwater supplies, interfere with groundwater recharge, or impede sustainable groundwater management of the Livermore Valley Main Groundwater Basin. Impacts would be less than significant. c) Substantially alter the existing drainage pattern of 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 erosion or siltation on- or off-site; 69 Alameda Countywide Clean Water Program. 2019. C.3 Stormwater Technical Guidance Manual. September. Website: https://cleanwaterprogram.org/businesses/development.html 70 City of Pleasanton. 2016. 2015 Urban Water Management Plan. June. Website: http://admin.cityofpleasantonca.gov/civicax/filebank/blobdload.aspx?BlobID=28207. Accessed March 11, 2021.