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City of Pleasanton 2023-2031 (6th Cycle) Housing Element Update Errata Final EIR 3-20 FirstCarbon Solutions https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480022/EIR/4 - Final EIR/21480022 Sec03-00 Errata.docx Regional Water Quality Control Board) to the Community Development Department, Planning Division that sites with identified contamination have been remediated to levels where no threat to human health or the environmental remains for the proposed uses. Section 3.9—Hydrology and Water Quality Page 3.9-1, Fifth Paragraph In response to ZONE 7-7, the following paragraph has been revised: The Alameda County Flood Control and Water Conservation District Zone 7 (Zone 7) is responsible for providing water and flood control protection to the Livermore-Amador Valley, and is the water wholesale agency supporting four water retailers in the valley – City of Pleasanton, City of Livermore, Cal Water, and DSRSD. The actual source of the Zone 7 water depends upon the time of year and rainfall levels and is made up of a blend of different sources, including the following: • State Water Project: The State Water Project is a system of reservoirs, canals, pipelines, and pump stations that transport water throughout California. Page 3.9-3, First Paragraph In response to ZONE 7-7, the following paragraph has been revised: Arroyo del Valle The Arroyo del Valle is an unchannelized stream that originates at the Del Valle Reservoir and flows west through unincorporated Alameda County and Shadow Cliffs Regional Recreation Area and continues to meander through the City of Pleasanton to its confluence with the Arroyo de la Laguna and Alamo Canal originates upstream of the Del Valle Reservoir and is channelized in the lower reach of Pleasanton. A distinctive riparian corridor is present on both sides of the stream channel. Page 3.9-3, Second Paragraph In response to ZONE 7-7, the following paragraph has been revised: Chain of Lakes The Chain of Lakes is a future plan where certain former gravel pits would be transitioned from their current ownership to Zone 7 (over several years to decades). The lakes could be connected into a “chain” and used as part of Zone 7’s broader water supply and flood control operations. However, this future project is not yet complete or operational. The Chain of Lakes is a series of former gravel pits that are currently being improved for stormwater retention/flood control and groundwater recharge. Water from the Arroyo Mocho is released periodically into the Chain of Lakes area. The Arroyo Mocho flows through the Tri- Valley and near the Chain of Lakes but is separated from it by levees. Surface water does not flow out of the Chain of Lakes area; thus, the area is not considered part of the Arroyo Mocho Watershed.