HomeMy WebLinkAbout1 - Original Submission_ Contract Modification with PMX_20220209Page 1 of 2 Contract Modification Rev. 09/2021
CONTRACT MODIFICATION AGREEMENT NO. 1 BETWEEN THE CITY OF BREMERTON AND PARAMETRIX
PROJECT: Gorst Sewer Water Hammer Analysis
CONSULTANT: Parametrix, Inc.
DATE: February 9, 2022
THIS CONTRACT MODIFICATION AGREEMENT SPECIFICALLY AMENDS THE
Gorst Sewer Water Hammer Analysis AGREEMENT (the "Contract") entered into between the City of Bremerton and Parametrix, Inc. on June 28, 2019.
All provisions in the Contract shall remain in full force and effect except as expressly modified by this document.
For valuable consideration and by mutual consent of the parties, the modifications to the Contract are as follows: I.
Section I. Scope , is modified as follows: See additional scope attached as Exhibit A.
Section II. Term , is modified as follows: The Consultant shall complete the work described in this Contract Modification Agreement by July 31, 2022.
Section III. Compensation , is modified as follows: The original contract amount was $24,111.39. The City shall pay the Consultant for the additional work described above, based on time and materials, an amount not to exceed $18,710.56 for a total amended contract amount of $42,821.95, including this Contract Modification. See Exhibit B.
II.
Consultant accepts all requirements of this Contract Modification by endorsing below. Consultant further agrees that this Contract Modification constitutes full and final
settlement of all of the Consultant’s claims for contract time and for all costs of any kind, including without limitation, costs of delays related to any work either covered or affected by this Contract Modification, claims related to on-site or home office overhead, or lost profits. This Contract Modification does not limit the City’s right to bring a claim for past performance.
The undersigned consultant approves the foregoing Contract Modification as to the changes, if any, in the contract price specified for each item, including any and all supervision costs and other miscellaneous costs relating to the change in work, and as to the extension of time allowed, if any, for completion of the entire work due to said Contract Modification.
DocuSign Envelope ID: 2C66EEC1-ACA0-4A24-94D4-7EF0A302A516
Page 2 of 2 Contract Modification Rev. 09/2021
This document will become a supplement of the contract and all provisions will apply hereto. It is understood that this Contract Modification shall be effective when approved by the City
of Bremerton.
The parties whose names appear below warrant that they are authorized to enter into a contract modification that is binding on the parties of this contract. In addition, Consultant warrants that it has or will inform the surety of this change, and shall take appropriate action
to modify any bonds required under the contract to address this change.
IN WITNESS WHEREOF, the parties have executed this Contract Modification on the day and year first written above.
City Engineer / Public Works Director approved to process _________________________ (Initials and Date)
PARAMETRIX, Inc. THE CITY OF BREMERTON
By: By:
Print Name: JC Hungerford Print Name:Greg Wheeler_________
Its: Water Division Manager Its:Mayor______________________
Date: Date:
APPROVED AS TO FORM: ATTEST:
By: By: KYLIE J. FINNELL, Bremerton City Attorney ANGELA HOOVER, City Clerk
NOTICES TO BE SENT TO: NOTICES TO BE SENT TO:
Attn: Joel Linke Attn: Angela Hoover Parametrix, Inc. City of Bremerton
60 Washington Ave, Suite 390 345 6th Street, Suite 100 Bremerton, WA 98337 Bremerton, WA 98337-1891
R:\Legal\Legal\Forms\FORMS ON COBWEB\Contract Modification Rev. 09 2021.docx
DocuSign Envelope ID: 2C66EEC1-ACA0-4A24-94D4-7EF0A302A516
3/11/2022
3/16/2022 3/16/2022
City of Bremerton / Parametrix February 2022 Gorst Sewer Water Hammer Analysis Page 1 of 2
Amendment 1 – Exhibit A
EXHIBIT A – AMENDMENT 1
SCOPE OF WORK FOR GORST SEWER WATER HAMMER ANALYSIS
Goal: Provide additional evaluation of the Gorst sewer forcemains and pump stations SB1, SB3,
and SB4; and provide additional evaluation and recommendations for air valves and/or surge
tanks for the system. Approach:
• SB1 Inflow Evaluation: Provide short written summary of calculated peak hour inflow
for SB1 based on:
o City’s description of 240 homes from the Bayside development and 380 homes from the Sinclair development. o Assumed water usage rate of 200 gpd per home.
o Peaking factor of 4.
• SB1 Pump Modifications: If the rated capacity of the pump station can be reduced based on the SB1 inflow evaluation, evaluate the following: o Reduction in pump impeller diameter to produce the reduced flow. o A combination of impeller diameter reduction and reduction of pump speed via
the existing VFD can produce the reduced flow.
o Note that the minimum recommended flow for SB1 will be approximately 650 gpm, which is the flow required to maintain a minimum scour velocity of 3.0 ft/s in the 10” forcemain.
• Forcemain Selection: Based on the recommended reduced flow at SB1, provide recommendation(s) for which forcemains to use in normal operation based on reaching minimum scour velocity and staying below maximum velocities as recommended by Department of Ecology and based on residence time in the forcemains: o Evaluate forcemain operation for SB3 operating into only the 8-inch forcemain.
o Evaluate forcemain operation recommendation for SB1 and SB4 operating in 10-inch forcemain only.
o As sewer residence time in forcemains increases, potential for odors and corrosion increases as well. Forcemains are typically designed to cycle their volume (factor of diameter and length) at least 3 times per day to help reduce potential for odors
and corrosion in the forcemain, discharge manhole, and downstream system.
• System Curves: Provide system curves covering the range of recommended pumping/forcemain scenarios.
• Water Hammer Protection: Based on the recommended pump station and forcemain
operation above, provide the following additional model evaluation:
o Evaluate water hammer protection with:
10-inch FM operation only (only needed if flow from SB1 increases from the previous evaluation):
• Only vacuum relief valves for along forcemain, identifying critical air valves
• Only the existing surge tank at SB1
DocuSign Envelope ID: 2C66EEC1-ACA0-4A24-94D4-7EF0A302A516
City of Bremerton / Parametrix February 2022 Gorst Sewer Water Hammer Analysis Page 2 of 2
Amendment 1 – Exhibit A
If 8-inch FM only operation is recommended:
• Only vacuum relief valves for along forcemain, identifying critical
air valves
• Adding a surge tank at SB3 o Recommended water hammer protection redundancy considering the following alternatives:
Dual vacuum relief valves at critical locations
Use of surge tank and single vacuum relief valves at critical locations
Addition of surge tank(s), and ignoring vacuum relief valves along forcemains for protection
• Air Valves:
o Having identified the critical air valves, evaluate pros/cons/risks and costs for the following options in technical memorandum for their replacement:
Compare mounting combination air valves on the top of the forcemain versus mounting an air release valve on the top of the forcemain and a
vacuum relief valve off the springline of the pipe.
Evaluate elimination of odor control cannisters at the valves, but providing the ability to add odor control in the future. If eliminated, City staff would observe operation to determine if there are any odor complaints.
Provide type, size and conceptual arrangement of proposed carbon
canisters on air valves.
• Operation and Maintenance: Summarize maintenance recommendations for proposed and existing water hammer protection related equipment, such as air valves, surge tanks, and odor control. Include information related to the use, maintenance, and redundancy.
• Technical Memorandum: Summarize findings in a draft and final technical memorandum with engineer’s opinion of probable construction costs.
• Review Conference Calls: Two conference calls with City staff using exhibits to discuss potential improvements prior to issuing final memorandum – up to 1 hour each.
A Management Reserve of $3500 has been included for any additional evaluation that is subsequently identified. This reserve shall only be used upon written authorization by the City. Deliverables:
• Draft and Final Technical Memorandum with engineer’s opinion of construction costs.
DocuSign Envelope ID: 2C66EEC1-ACA0-4A24-94D4-7EF0A302A516
Ray Nickel, PE, PMP (or other QC)Joel Linke, PEBrandon Moss, PESandy CosgroveLori GilbertsonAmanda LucasSr ConsultantSr Engineer (Mechanical)Engineer III Project Controls SpecialistSr Project AccountantPublications SupervisorRates: $256.83 $201.51 $142.91 $120.07 $132.10 $119.05
Task Description Total Expenses
Labor
Dollars
Labor
Hrs
100 Water Hammer Analysis $15,210.56 $0.00 $15,210.56 95 6 18 66 2 1 2
SB1 Inflow and Pump Modifications $1,546.30 $1,546.30 10 2 8
Forcemain Selection, System Curves, and Water
Hammer Protection $7,328.48 $7,328.48 48 8 40
Air Valves and O&M Recommendations $974.66 $974.66 6 2 4
Tech Memo, QC Review, 2 Conf. Calls with City $5,361.12 $5,361.12 31 6 6 14 2 1 2
Subtotal of Task Budgets $15,210.56 $15,210.56 $1,540.98 $3,627.18 $9,432.06 $240.14 $132.10 $238.10
Management Reserve**$3,500.00 ** Management Reserve to be used only upon written authorization of the Owner.
Total Parametrix Budget $18,710.56
Exhibit B Fee Schedule - Amendment 1
City of Bremerton
Gorst Sewer Water Hammer Analysis
Parametrix, Inc.
ORIGINAL CONTRACT AMOUNT = $24,111.39
AMENDMENT AMOUNT = $18,710.56
REVISED CONTRACT AMOUNT = $42,821,95
DocuSign Envelope ID: 2C66EEC1-ACA0-4A24-94D4-7EF0A302A516