Item 11 - Water Infrastructure Improvement Program UpdateMarch 16, 2021, Item #11AGENDA REPORT CityofPoway CITY COUNCIL DATE: March 16, 2021 TO: FROM: Honorable Mayor and Members of the City Council Eric Heidemann, Director of Public Works ,r Shadi Sarni, Principal Civil Engineer S5 CONTACT: (858) 668-4717 or ssami@poway.org SUBJECT: Water Infrastructure Improvement Program Update Summary: This report presents a status update on each project within the Water Infrastructure Improvement Program. Recommended Action: This is an informational item and there is no recommended action. Discussion: The Water Infrastructure Improvement Program was most recently presented to the City Council at the November 17, 2020 Council Meeting as part of Agenda Item #13, "Approval of an Amendment to the Agreement with Kennedy/Jenks Consultants, Inc. for Program Management Services, RFQ No. 20-001, and adoption of the resolution approving the California State Treasurer's debt issuance pool lists, and agreement with Fieldman, Rollap & Associates, Inc., and an agreement with Stradling Yocca Carlson & Rauth". The following components make up the proposed program (collectively the "Water Infrastructure Improvement Program"): The Clearwell Bypass Project consists of bypass pipelines, a pump station, a pressure regulating station and two temporary bypass tanks. Each tank has a storage capacity of approximately 1.4 million gallons. The bypass pipelines, pump station and pressure regulating station will be located within City property at the Lester J. Berglund Water Treatment Plant site, as well as the Operations yard and parking lot. The two tanks will be located on the softball field at Lake Poway Park. This bypass system allows the clearwell to be taken offline for replacement. The impact to Lake Poway Recreation Area will be as follows: the softball field will be used for temporary water storage tanks and likely unavailable for use beginning September 2021 through 1 of 6
March 16, 2021, Item #11Spring 2024. The City Manager and Community Services staff have communicated with the softball league representatives and are exploring alternative locations for use during the extended closure. The parking lot adjacent to the entry booth will be used as a staging area and likely closed for the duration of the project. This will reduce overall parking capacity by 52 spots and correspondingly reduce parking revenue. This is the lot closest to the archery range. Visitors will need to park a little further to access the range. The lower playground (adjacent to the parking lot) will also likely be closed for safety reasons. Check-in/base camp for Lake Poway Day Camp, which has traditionally been in the area between the softball field and the lower playground, will be relocated. The Clearwell Replacement Project consists of replacing the existing clearwell with two new reservoirs. The existing clearwell has reached the end of its useful life and is in need of replacement to maintain reliable service to Poway residents. The overflow structure of the clearwell will also be replaced with a new structure designed with proper air gaps. The San Diego County Water Authority (SDCWA) Treated Water Connection and Redundant Pipeline Project provides Poway with its first treated water connection to the SDCWA's treated water aqueduct, as well as providing redundant pipelines. This project consists of a flow control facility, a pressure reducing station, pipelines, a pump station and a forebay. This project will help diversify Poway's water supply portfolio and allow for operational flexibility and plant maintenance. It will also provide a redundant pipeline to the 36" water transmission line on Lake Poway Road, which is currently the single transmission line that carries treated water to the distribution system. Status Update: Clearwell Bypass Project: The Clearwell Bypass Project includes construction of approximately 1,140 linear feet of 36" CM L&C (cement mortar lined and coated) welded steel pipe; approximately 75 linear feet of 24" CML&C welded steel pipe; approximately 1,620 linear feet of 24" HOPE (high density polyethylene) pipe, a number of butterfly valves ranging in size from 24" to 42" as well as a number of check valves and gate valves; pipe couplings; a 42"x36" welded steel tee connection to the treatment plant effluent pipeline, modifications to the effluent pipe concrete gallery, four vertical turbine pumps (40 HP each) and pump cans; two-1.4 million gallon bolted steel tanks; pressure gauge assemblies; electrical, instrumentation and security cameras; as well as several other appurtenances (Attachment A). This project is currently at the 60 percent design stage and is scheduled to be advertised for bids in May 2021 and awarded in July 2021. A preliminary construction schedule for this project is September 2021-April 2022. Clearwell Replacement Project: The Clearwell Replacement Project is at the planning stage. A draft preliminary engineering report has been prepared by Kennedy Jenks Consultants and is currently under review by City staff. A preliminary construction schedule for this project is September 2022-February 2024. SDCWA Treated Water Connection and Redundant Pipeline Project: Public Works Department staff and consultants are working closely with the SDCWA on a planning study that will be presented to the SDCWA Board of Directors on March 25, 2021 for approval. The SDCWA has shared the draft planning study with the following stakeholders for review: City of San Diego, Olivenhain Municipal Water District, and Ramona Municipal Water District. The final Planning 2 of6
March 16, 2021, Item #11Study will be part of an engineering report that will be submitted to the State Water Resources Control Board, Division of Drinking Water (DOW) by April 1, 2021. There are two alternatives that the Planning Study recommends for further analysis: Construction of a new 24 cfs. (cubic feet per second) service connection and flow control facility off of the 36" diameter Ramona Pipeline, upstream of the Ramona Water District RAM-3 service connection. This proposed connection will be constructed near Espola Road and the Green Valley Truck Trail and will be located on the west side of Espola Road, within Poway property. This alternative also includes a pump station, a forebay and approximately 5,100 linear feet of new 36" transmission pipeline from the flow control facility to the clearwell. The location of the proposed pump station and forebay tank will be within the lower parking lot on Lake Poway Road, near the Public Works Operations Yard (Attachment B). Construction will require a two-year shutdown notification to the Water Authority so that the Water Authority can prepare and notify other member agencies. A preliminary construction schedule for this alternative is February 2026-September 2026. Conversion of SDCWA's Pipeline 1 within the first aqueduct from untreated water to treated water. This alternative requires additional assessment of operational and design changes, as well as modifications to Water Authority facilities. Further analysis of this alternative will be included in the Water Authority's 2023 Master Plan Update. A regional analysis will also be conducted as part of the Water Authority's 2023 Master Plan Update to determine if the first aqueduct conversion to treated water will be a viable alternative from a regional perspective. In addition, the selection of this alternative will require the approval of DDW's District Engineer, according to the agreement between the City of Poway and the DOW. A preliminary construction schedule for this alternative is June 2026-December 2026. Next Steps: As the various components of the program approach design completion, a construction contract will be prepared, and the projects will be advertised for bids. Staff will request award of the various construction contracts to the successful apparent low bidders at future Council Meetings. Environmental Review: This item is not subject to review under the California Environmental Quality Act (CEQA). Fiscal Impact: None. Public Notification: None. Attachments: A. Clearwell Bypass Project Facilities B. SDCWA Treated Water Connection and Redundant Pipeline Project Facilities 3 of6
March 16, 2021, Item #11Reviewed/ Approved By: aserman Assistant City Manager 4of6 Reviewed By: Alan Fenstermacher City Attorney Approved By: ~ City Manager
March 16, 2021, Item #11LEGEND
_ Existing Water Pipeline
_ Existing Storm Drain
....... Proposed Buried Water Pipeline
-Proposed Above-ground Water Pipeline
-Proposed Overflow Pipeline
March 16, 2021, Item #11