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HomeMy WebLinkAboutMurray Smith Assoc Rapture Cove - Ltr of AgmtM January 6, 2016 PUBLIC WORKS DEPARTMENT (509) 545-3444 / FAX (509) 543-5728 PO Box 293 (525 North 3` Avenue) Pasco, Washington 99301 / www.pasco-wa.gov LETTER OF AGREEMENT Murray, Smith & Associates, Inc. Attn: Joe Foote, PE 421 W. Riverside Ave., Suite 762 Spokane, WA 99201 RE: Letter Agreement — Sewer System Review for Rapture Cove Property Dear Mr. Foote: The City desires to engage the professional services and assistance of Murray, Sutitit & Associates, Inc. to provide professional engineering services to assist in evaluating the capacity of specific sewer lines using the City's sewage collection system computer model with respect to the Rapture Cover Property. The scope of services is outlined on Exhibit A with an estimated cost of not to exceed $2,000 and a completion date of February 15, 2076. The City of Pasco and Murray, Smith & Associates, Inc. agree to the terms of this Letter Agreement by signing below: Ahmad QayoufnriL Date e oote, P.E. ate Public Works Director urray, Smith & Associates, Inc. AQ/pma SCOPE OF SERVICES CITY OF PASCO, WASHINGTON RAPTURE COVE PROPERTY — SEWER SYSTEM REVIEW This scope of work is for professional engineering services provided by Murray, Smith & Associates, Inc. (MSA) for the City of Pasco, Washington (City). Services associated with this scope of work include the evaluation of the sanitary sewer flows, impact on the existing sewer system, and review of the proposed sewer system in the developer's drawings submitted to the City. SCOPE OF SERVICES Task I — Sewer System Capacity Analysis and Review The City is reviewing proposed plans for a new development (Rapture Cove) which includes approximately 4.8 acres (56 units) near the comer of Road 90 and Wilshire Drive. The new development would connect to the existing eight inch sanitary sewer main in Road 90. The 2014 General Sewer Plan Update has identified several capacity deficiencies in the sewer system downstream of this development and the impact of the new connections will be evaluated. MSA will develop sanitary sewer flow rates for the 56 units based on unit loading assumptions from the 2014 General Sewer Plan Update. These flows will be compared to the current system capacity and flow projections. The analysis will identify and document any potential sewer capacity deficiencies associated with the new development. System deficiencies will be based on City design criteria related to maximum water depth to pipeline diameter ratios during peak dry weather and maximum surcharging allowances during peak wet weather. MSA will determine the maximum number of units that can be connected to the existing system, if the zoning is changed to allow for an increased density. MSA will also review the proposed sanitary sewer layout for the development and highlight any issues with compliance to the Department of Ecology Criteria for Sewage Works Design. Assumptions: MSA will utilize the design standards developed for the General Sewer Plan Update in the analysis. City will provide information on the proposed development and any upstream developments that impact the capacity of the existing sewer main in Road 90. No on-site meetings or field work are included in this scope of work. Existing and future (20 year) conditions will be evaluated. The scope and budget are limited to one service alternative for connection at Road 90. Deliverables: A final technical memorandum summarizing the analysis will be provided in electronic format. City of Pasco, WA MURRAY, SMITH & ASSOCIATES, INC. On- Call Sewer Modeling December 2015 Engineers/Planners 1 of 2 Exhibit A Fee Estimate The total budget for this work is estimated at $2,000. All proposed work will be completed on a time and materials basis not to exceed the total amount identified without prior written authorization from the City. Time of Performance Completion of the work is dependent on a Notice to Proceed from the City and will be accomplished within two weeks of that date. City of Pasco, WA MURRAY, SMITH & ASSOCIATES, INC. On- Call Sewer Modeling December 2015 Engineers/Planners 2 of 2