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