HomeMy WebLinkAboutChange Order No. 1 with Contractors Northwest for WWTP Fermentation and Odor Control ProjectM me
To: Jaycee L. Holman, City Clerk,
From: Keith Watts, Purchasing Manager
CC: Jacy Jones, Clint Dolsby
Date: 10/24/13
Re: November 6 City Council Meeting Agenda Item
The Purchasing Department respectfully requests that the following item be placed on the
November 6~' City Council Consent Agenda for Council's consideration.
Approval of Contract Change Order No. 1 to the existing Agreement for Independent
Contractor Services for "WWTP Fermentation and Odor Control Project to
Contractors Northwest for the Not-To-Exceed amount of $161 996 00
Recommended Council Action: Approval of Contract Change Order No. 1 to
Contractors Northwest for the Not-To-Exceed amount of $161,996.00 and
authorize the Purchase Manager to sign. This change order represents a 7%
increase in the contract amount for a total of $2,383,496.00. This change order
is within the project budget.
Thank you for your consideration
• Page 1
DATE: 10/23/2013
SUBJECT: Project Information; WWTP Fermentation and Odor Control Project 10045a
Construction Change Order 1
__:.._ - - g_- _. _......
I. l)EPAItTI~IENT CONTACT PEItS®NS
Clint Dolsby, Asst. City Engineer (Project Manager) 489-0341
Warren Stewart, PW Engineering Manager 489-0350
John McCormick, Deputy Public Works Director 489-0378
II. IDIESCIt.IPTI®N
A. Back rg ound
The objective of the primary sludge fermentation process is to promote a reliable
biological phosphorous removal process through the addition of volatile fatty
acids to the secondary treatment system at the wastewater treatment plant.
Volatile fatty acids (VFAs) are the preferred food for the biological phosphorus
removal processes, and the Meridian wastewater treatment plant influent
wastewater has limited VFAs. A fermentation process has the capability to
produce VFAs to promote a reliable biological phosphorus removal process at
the Meridian wastewater treatment plant.
B. Proposed Project
The Wastewater Treatment Plant (WWTP) boilers can operate off either methane
gas or natural gas but has been experiencing problems with boiler operation
during the winter months when operated with methane gas. The excess moisture
causes three problems.
1. Methane piping plugs with water requiring maintenance staff to blow the
gas piping out with air.
2. Boiler has pressure regulators that become filled with water and must be
replaced.
3. Moisture causes excessive scaling deposits in boilers.
Page 1 of 3
Due to these problems, to perform maintenance methane feed to the boilers has to
be shut down and switched to operate on natural gas. The WWTP has to purchase
natural gas during this time which adds additional operation cost to the WWTP
budget. The moist gas also increases wear and tear on the boilers and ancillary
equipment. The WWTP's temporary solution has been to blow the gas piping out
with air more frequently. This puts maintenance staff in adangerous/explosive
environment during this maintenance task. Change Proposal Request 2 from
Contractors Northwest to install a desiccant moisture removal system to remedy
these issues at the wastewater treatment plant is valued at $150,997.
The remaining modifications in this change order include the replacement of worn
out piping with glass lined pipe and the replacement of doors and window
framing in the digester 1 and 2 building valued at approximately $11,000.
III.
INIPAC'I'
A. Strategic Impact:
This project will help increase efficiencies at the Wastewater Treatment Plant and
investigate alternative methods of wastewater treatment to reduce nitrogen and
phosphorous loadings into our receiving stream.
B. Seryice/Delivery Impact:
Improving the operation of the biological nutrient removal processes at the
wastewater treatment plant will not only help to stabilize the plant operation, it
will additionally improve the removals of the nutrients that are regulated or will
be regulated in our facility permits.
C. FiscalImpacts~
This change order will be financed using the Fiscal Year 2014 fermentation
enhancement. The construction will be completed in Fiscal Year 2014.
Proiect Costs
Fiscal Year 2013 Construction $1,500,000.00
Fiscal Year 2014 Construction $721,500.00
Services During Construction $257,006.00
Special Inspections $14,045.25
Change Order 1 $161,996.00
Total Cost $2,654,547.25
Proiect Funding
Fiscal Year 2013 Fermentation (3590-96130) $1,565,000.00
Fiscal Year 2013 Odor Control (3590-92100) $450,000.00
Fiscal Year 2014 Fermentation (3590-96130) $1,000,000.00
Total Funding Available $3,015,000.00
Page 2 of 3
IV. TIME CONSTRAINTS
Council's approval will allow this project to improve the performance of the
biological nutrient removal to be completed in fiscal year 2014.
V. LIST OF ATTACHMENTS
A. Change Order 1 for the ~'ermenta and Odor Control Project
Approved for Council Agenda: ,~, ~,~ ,~,.., ~ _ ` '~ _ -- ~~~' ~~, ~~ ~;~ ~ -~~;
Warren Stewart Date
Page 3 of 3
CITY OF MERIDIAN
33 EAST BROADWAY
MERIDIAN, ID 83642
CHANGE ORDER NO. 1
PROJECT NO. 10045a
DATE: 9/30/2013
EFFECTIVE DATE: 9/30/2013
CONTRACT CHANGE ORDER
'CONTRACTOR: Contractors Northwest, Inc.
PROJECT: WWTP Fermentation and Odor Control Project
The Contractor is hereby directed to make the following changes from the Contract Documents and Plans.
Description:
Replacement of PVC pipe with glass lined pipe, installation of a digester gas moisture control system
and the replacement of door and window hardware in the digester 1 and 2 building.
Reason for Change Order:
The wastewater treatment plant is experiencing problems with boiler operation during the winter
months when operated with methane gas due to the methane piping and boiler gas pressure
regulators plugging with water. Additionally this change order will fund the replacement of worn out
doors and windows in the original digester building.
Attachments:
Pricing for COR 1, COR 2, COR 10-A, COR 10-B and COR 11
CHANGE IN CONTRACT PRICE: CHANGE IN CONTRACT TIMES:
Original Contract Price $ $2,221,500.00 Original Contract Times: 400
Net changes form previous Change Orders Net changes form previous Change Orders
No._ to _ No._0_ to _0_ (calendar days)
$ -
Price Prior to this Change Order:
$ 2,221,500.00
Increase (decrease) of this Change Order:
Contract Times prior to this Change Order:
(calendar days)
Net Increase (decrease) of this Change Order:
(calendar days)
$ 161,996.00
Price with all Approved Change Orders:
$ 2,383,496.00
(City Purchasing Manager)
Contract Times with all Approved Change Orders:
By: Keith Watts
Date:
RECOMMENDED:
Date: ~~ ,~,~ ,r~
0
400
400
By: Warren
Date:
City O£ Meridian
Detailed Statement of Revenues and Expenditures - Rev and Exp Report - Keith - Unposted Transactions Included In
Report
3590 - WWTP Construction Projects
60 - Enterprise Fund
From 10/1/2013 Through 9/30/2014
Capital Outlay
96130 Fermentation Projects
10045 Primary 1/2 Fermentation
10O45.a WWTP Fermentation & Odor
Control Ph 1 Construction
Carr... Carryforward
Total Capital Outlay
TOTAL EXPENDITURES
Budget with
Amendments
Percent of
Current Year Budget Budget
Actual Remaining Remaining
999,999.96 0.00 999,999.96 100.00%
0.00 883,496.00 (883,496.00} 0.00%
1,550,167.32 0.00 1,550,167.32 100.000
2,550,167.28 883,496.00 1,666,671.28 65.360
2,550,167.28 883,496.00 1,666,671.28 65.36%
Date: 10/25/13 06:56:01 Abf Page: 1