3_Exhibit C_ADDENDUM ONLY - Laserfiche WebLink

City of Pleasanton—Stoneridge Mall Residential Project Section 15183 Checklist/15164 Addendum CEQA Checklist FirstCarbon Solutions 177 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480017/Consistency Checklist/21480017 Stoneridge Mall Residential Project Checklist Addendum_Updated.docx the City would have sufficient capacity in water facilities to serve the proposed project and would not require new or expanded water treatment facilities. Impacts would continue to be less than significant with inclusion of MM 4.L-2, consistent with the Prior EIR. There are no proposed changes, new circumstances, or new information that would cause new or more severe impacts. Wastewater Facilities The proposed number of units, and therefore, the increase in demand for wastewater collection and treatment, has been accounted for as part of planned development under the Prior EIR. The project site is located within the DSRSD service area.108 Wastewater from the proposed project would be collected via new 6-inch sewer lines throughout the project site that would connect to an existing City-owned sanitary sewer main along the project site’s northern boundary. A Technical Memorandum addressing the proposed project’s sewer capacity was prepared by Woodard & Curran, dated December 20, 2022. The memorandum concluded that the proposed 6- inch sewer lines would be adequate in size to carry the peak flow rate for the proposed residential units, and would connect to an 8-inch sewer line in Drive Aisle A. Furthermore, the hydraulic profiles downstream of the proposed project (to the DSRSD WWRP) are modeled, both for peak dry-weather condition and for design. The City conveys all flows to DSRSD’s Regional Wastewater Treatment Facility in the City, which has an average dry-weather wastewater flow capacity of 17 mgd of wastewater,109 with plans to expand to 20.7 mgd after 2015 according to the Prior EIR. The City is currently allocated 8.5 mgd of the DSRSD’s average dry-weather wastewater flow capacity, expanding to a 10.3 mgd allocation when the DSRSD expands to 20.7 mgd total capacity. In addition, the Prior EIR states that the City approved Measure U in 1998, which allows the City to expand its capacity in the discharge system which is managed by the Livermore-Amador Valley Water Management Agency. Once completed, the expansion would allow the City to acquire an additional 6.9 mgd to its allocated capacity, totaling 14.4 mgd of total wastewater wet-weather discharge capacity. The proposed project would increase wastewater generation compared to existing conditions. As discussed in the Prior EIR, the buildout of the Housing Element, including the proposed project, would be fully supported by the City’s 8.5 mgd average dry-weather wastewater flow capacity and the City’s planned 14.4 mgd total wastewater wet-weather discharge capacity. Because the proposed project would develop as intended in the Housing Element, impacts would continue to be less than significant, and no mitigation is necessary, consistent with the Prior EIR. There are no proposed changes, new circumstances, or new information that would cause new or more severe impacts. Stormwater New storm drain lines would be located throughout the site that would convey runoff to multiple bioretention systems on the fringes of the project site. The bioretention basins would connect to an existing stormwater drainage line contained within Stoneridge Mall Road. The proposed project 108 Dublin San Ramon Services District (DSRSD). 2022. Service Area. Website: https://www.dsrsd.com/about-us/library/service-area. Accessed November 18, 2022. 109 Dublin San Ramon Services District (DSRSD). 2022. Fact Sheet – District at a Glance. Website: https://www.dsrsd.com/home/showpublisheddocument/811/638010939127370000. Accessed November 18, 2022.