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HomeMy WebLinkAboutGHD, Inc. 2020-09-02; Amendment 2 2022-11-03CITY OF UKIAH AMENDMENT NO. 2 TO PROFESSIONAL SERVICES CONTRACT 2021112 BETWEEN GHD INC and THE CITY OF UKIAH This Amendment No. 2, entered on November 3, 2022, revises the Agreement for Professional services dated August 27, 2020 between the City of Ukiah and GHD Inc., as follows. 1.Add additional design services to scope of work, per attached Exhibit 1. 2.Add an additional $20,000 for professional services related to the siting and analysis of water storage, for a revised, total contract amount not-to-exceed $42,123.89 Except as expressly amended by this Amendment, all other terms remain unchanged and in full force and effect. IN WITNESS WHEREOF, THE PARTIES HAVE EXECUTED THIS AMENDMENT ON THE EFFECTIVE DATE: GHD INC. BY: DATE: PRINT NAME: CITY OF UKIAH BY: DATE: SAGE SANGIACOMO, CITY MANAGER ATTEST BY: DATE: KRISTINE LAWLER, CITY CLERK COU NO. 2021-112-A2 Nov 22, 2022 Kristine Lawler (Nov 22, 2022 08:48 PST) Kristine Lawler Nov 22, 2022 The Power of Commitment GHD 2235 Mercury Way, Suite 150 Santa Rosa, California 95407 United States www.ghd.com Your ref: 2021-112-A1 Our ref: 11217088 August 04, 2022 Tim Eriksen, PE Director of Public Works/City Engineer Public Works Department City of Ukiah 300 Seminary Avenue Ukiah, CA 95482-5400 RE: Proposal for Professional Engineering Services: Siting and Analysis of Water Storage, Pumping and Transmission System Dear Mr. Eriksen: GHD is pleased to provide this proposal for professional engineering services for the siting and analysis of new water storage tanks, including mains and the need for pumping systems in areas south and west of the City limits. The purpose of the project is to provide municipal water service to proposed future residential developments and to augment existing water storage for the City. The City is working with a developer of an area in the hills west of the City limits, and the development of the property requires water storage infrastructure. The City would also like to augment its existing storage to increase fire protection and to provide operational flexibility with the other tanks in the system. Background GHD performed an initial desktop GIS analysis of a storage system, potential tank sites and service area pressures, and summarized the results in a technical memorandum dated September 18, 2020. This memorandum was followed by a detailed planning study that investigated tank types, tank siting, tank sizing and hydraulic analysis of four potential sites as well as interconnections with the City’s existing distribution system. The purpose of the second study was to provide technical information and planning level costs so the City can make informed decisions regarding the design and construction of one or more new water storage tanks. The results of the study were summarized in a technical memorandum dated December 20, 2020. This current study will look in greater detail at the siting of proposed 1.5 million gallon (MG) storage tanks located at Site 1. The elevation of Site 1 is higher than the City’s other water tanks, and the City would like to look in greater detail at system operations with higher tanks, and whether there is a feasible site at a lower elevation where the tanks could be sited so they can “float” with the City’s other tanks in the Zone 1 pressure zone, thereby eliminating the need for one or more booster pump stations and pressure reducing stations. EXHIBIT 1 11217088 | RE: Proposal for Professional Engineering Services: Siting and Analysis of Water Storage, Pumping and Transmission System 2 Scope of Services The Scope of Services proposed is to perform an update of the siting and hydraulic analysis summarized in a technical memorandum dated December 20, 2020, with specific focus on the tanks to be located at Site 1, and to determine whether there are any other feasible sites at a lower elevation. The purpose of this task is to develop alternatives for storage, water main alignments, interconnections between the proposed tanks and City water system, and establish the design basis referencing the analysis results and recommendations developed in Technical Memorandum No. 2 for the Water Tank Planning. A draft basis of design (BOD) report will be prepared to confirm the design concept, summarize the design criteria, and investigate alternatives for interconnecting the tanks with the City’s existing water system and existing Zone 1 tanks, updated hydraulic analysis for the system, determine the need for booster pumps, and capture the recommendations and City input. GHD will assess the design criteria and City’s requirements, including applicable standards, and other recommendations. GHD will prepare a draft BOD report including the tank siting and analysis results including requirements and recommendations for the following: – Siting options and recommended Site 1 tank siting – Need for booster pump station at the west end of Redwood Avenue – Redwood Avenue water main replacement – Water tank interconnections – Connection alternatives to the City’s water system – Need for Pressure Reducing Valves (PRVs) and Check Valves (CVs) – Updated hydraulic analysis The draft BOD report will include a recommended project and will be submitted to the City comments. The report will be updated to address comments and incorporate more detailed design information during the design phase of the project. Fee Proposal Our understanding is that the contract mechanism will be through an amendment to the existing Professional Service Agreement for this project. GHD proposes to complete the Scope of Services for the time-and- materials fee not to exceed $20,000.00 without the prior written authorization of the City. Services not included in this proposal can be provided by a negotiated fee at current rates. We welcome the opportunity to continue working with the City of Ukiah on this important project and look forward to contributing to its success. Should you have any questions, please do not hesitate to contact me. Respectfully Submitted, Matthew Kennedy, PE, TE Principal Engineer +1 707-540-3376 matt.kennedy@ghd.com Copy to: Jason Benson