AKEL ENGINEERING GROUP, INC. (2)

Page 7 of 9 a. F-3. Construct 3,100 linear feet of new 12-inch diameter main on Valley Avenue from Pleasanton Avenue to Sunol Boulevard. This main is required with the construction of the new well at Bernal Park. b. F-4. Construct 975 linear feet of new 12-inch diameter main on Oak Vista Way from Cotton Mill Way to Valley Avenue. This main is required with the construction of the new well at Bernal Park. c. F-5. Construct 2,300 linear feet of new 16-inch diameter main on Hansen Drive between Del Prado Well to Valley Avenue. This main is required with the construction of the new well at Del Prado Park. The projects to implement the above would also likely pick up the following future pipeline deficiencies associated with future demand that was identified in the WDSCMP and builds off the near-term improvements (i.e., S-1, S-2, S-3, and BS-1) to avoid sunk costs: d. F-1. Replacement of 3,250 liner feet of existing 12-inch main on Stoneridge Drive with a new 24-inch diameter main. e. F-2. Replacement of 310 linear feet of existing 12-inch main on Foothill Road with a new 24-inch diameter main. The projects are currently in the predesign phase. Changes Since the WDSCMP During the predesign phase for the Long-Term Improvements for Water Supply Change, new information and direction was obtained that differ from the assumptions in the WDSCMP as follows: 1. The Bernal Park site has been determined to no longer be a top location for a new City well for the following reasons: a. SFPUC has a reservation of water rights on this site. To pursue a well at this location would require negotiations with SFPUC and/or legal investigation into exercising appropriative groundwater rights. b. High level review and verbal discussion with Zone 7 indicate that Bernal Park is believed to have relatively low water transmittivity. c. There is currently some uncertainty on the PFAS plume boundary by Zone 7 near Bernal Park. Based on a recent well siting analysis performed by the City and Zone 7, the following were identified as top locations for new wells: Del Prado Park, Tennis and Community Park, and Hansen Park. 2. The City and Zone 7 recently entered into agreement to determine the feasibility of jointly implementing new groundwater facilities. The goal of the project is to increase Zone 7’s groundwater production capacity for the overall Tri-Valley region and recover the City’s groundwater production quota (GPQ). If implemented, the City would no longer build two new City wells. Instead, Zone 7 would operate a joint facility and deliver the City’s GPQ through the turnouts along with wholesale purchases. The scope of work outlined in the section below is to evaluate impacts to the water distribution system and the recommendations made in the WDSCMP based on the changes described above related to groundwater supply. Scope of Work Docusign Envelope ID: E67CB798-34D0-4A4E-BFB8-E9718C48E0D9