HomeMy WebLinkAbout Ewing Company Change Order 7 WRRF Headworks Capacity ExpansionCITY OF MERIDIAN
33 EAST BROADWAY
MERIDIAN, ID 83642
CHANGE ORDER
CHANGE ORDER NO 7
PROJECT NO.100u.i
CHANGE ORDER DATE:1Anno18
EFFECTIVE DATE:1011t2018
CONTRACTOR:Ewing Company, lnc.
PROJECT:WRRF Headworks Capacity Expansion
The Conlractor ls hereby directed to make the following change from lhe Contract Documents and Plans.
Description of additional work: (attach additional pages if needed)
Work in this change order includes the following change proposal requests (CPR): #18, #19, #ZO,#21,#ZZ,#24,#25,#26. This
CPRs are described in the attached pages.
VI'FIO REQUESTED THE CHANGE U City D Contractor
I
iwHY ts THE CHANGE NECESSARY
I
lCheck all that apply
El Unforeseen / Hidden Conditions
tr Enor with the Plans and/or Specifications
Explanation:
Reasons why the changes are necessary are explained in the attiached pages.
E Scope Change
D Other - descrtbe below
REASON FOR CHANGE ORDER VS. BIDDING ADDITIONAL WORK
Check all that apply
Fl The work is in the area of the orioinal contract and a conflict with the on-site contractor is probable and
would make coordination of work difficult and bidding unreasonable.
E Time is of the essence and bidding would require the contractor to stop work and the City would face
costly standby fees therefore making bidding disadvantageous
D Emergency Work to correct unsafe conditions.
tr Other - describe below
ExplanatiOn: (attached additional pages lf needed)
The work of this change order is directly related to work that is being performed by the Ewing Company. Having the work done by
anolher contractor is not practical as it would negatively affect project schedule and incur higher costs than having EwirB perform
the work under the existing contract
Page 1 of 17
>wKy
Meridian City Council Meeting Agenda December 4, 2018 – Page 237 of 445
CHANGE IN CONTRACT PRICE:
OriginalConbact Price: $9,729,000.00
CHANGE IN CONTRACT TIMES:
Oiginal Contract Times: 545 days
Net changes from previous Change Orders
No. 1 to l',!c. 5friffiileoraernumbqs-iIE- $737,664.65ffi
Ned changes form previous Change Orders (catendar days)
i,!o. -1 to l.{o. 6 - -rc;trileodernumbersE*- 113 da rs
Net lncrease (decrease) of this Change Order:
$150,250.37
ErIr 60rir lrurI oa trltt chrlD gq
l.let lncrease (decrease) of this Change Order:
(cdondar.,ars)
29 days
Total Change (lncrease / decrease) to date:
$887,915.02
Total Days (lncrease /decrease) to date:
(calenbrdap)
New Contract Price with all Approved Change Orders:
$10,616,915.02
Ne*, Contract Times with all Approved Change Orders
(cabndardap)
687 days
(City Purchasing Manager)
Keith Watts
Date:r
*r,fu
Date: /O- tZ-17
RECOMMENDED: (CityProject DATE APPROVED BY COUNCIL (lf required)
1.0 SIGNATURE REQUIRED
DATE
submifted CCR #14 to the City PM and B&C for their review ard comment. Backup documentation was provided to the
The proposed cost was found to be appropriate for the scope of work.
Purcfiasinq Use Only
Budget Available (Attach Report)
Budget lnformation: Budget
Date Submitted to Clerk forAgenda:
Purchase Order No.
Yes
Date l*sued:
FY 19
rU29l2018
Amendment:
ApprovalDate:
Page2of 17
142 dala
Meridian City Council Meeting Agenda December 4, 2018 – Page 238 of 445
Change Proposal Requests (CPR) and Field Orders
CPR #18 ultrasonic level transducer remote displays
Description Summary:
The Ewing Company is directed to modify the Headworks Screens level transducers
mounted upstream and downstream of each screen to include remote
transmitters/displays.
Reason for change:
The specification called for ultrasonic level transducers with integral transmitters/displays,
which the Ewing Company originally submitted. However, the level transducers are going
to need to be mounted underneath the grating upstream and downstream of each screen.
Because the level transducers are mounted under the grating it is recommended to have
remote transmitters/displays that can be wall-mounted in a more accessible place for
operators in the screens room.
Cost Negotiation Process:
Ewing submitted CPR 18 to the City PM, City inspector, and B&C for their review and
comment. Labor cost breakdowns and material costs were provided to the reviewers. The
proposed costs were found to be appropriate for the scope of work. The CPR was
recommended by B&C and the costs were approved.
FinalCost=
Working Days=
CPR #19light pole and pipe conflict
Description Summary:
Relocate street light on NE side of digester, see sheet C-110-0012. Re-align 6" PSC line
to avoid street light on W side of digester, see sheet C-1 10-0012.
Reason for change
$8,451.87
0
Meridian City Council Meeting Agenda December 4, 2018 – Page 239 of 445
It was discovered that the street light on the NE side of the digester will conflict with
excavation of the trench for the 42" Pl and 36" RS lines so it will need to be relocated.
Similarly the light on the W side of the digester is in conflict with the 6' PSC line. The PSC
line can be re-aligned to avoid the light with the addition of some fittings.
Cost Negotiation Process:
Ewing submitted CPR 19 to the City PM, City inspector, and B&C for their review and
comment. Labor cost breakdowns and material costs were provided to the reviewers. The
proposed costs were found to be appropriate for the scope of work. The CPR was
recommended by B&C and the costs were approved.
FinalCost=
Working Days=
CPR #20 RW/NPW interconnectaon to Bio-filter supply
Description Summary:
The Ewing Company is directed to modify the Reclaimed Water (RW) system connection
to the Bio{ilter to include an interconnection with the Non-Potable Water (NPW) system
as shown on the revised drawing C-1 10-001 1 .
Reason for change:
The RW supply to the Bio-filter is for irrigation of the media during hot weather to prevent
biological organismdie-off onthemedia. Thissupplyisalsousedforhumldificationofthefoul-
air. ln further discussion with City Operations staff, there was preference given to turn-off the
WRRF RW system in colder months when humidiflcation water demands will be less than 10
gallons per hour and lrrigation will not be needed. The design drawings had provided for a
NPW stub in close proximity to the RW Bio-filter supply for future flexibility through an
interconnection of these systems. City Operations staff recommended that this
interconnection be made atthis time with inclusion of isolation valves and a double-check
backflow preventer to protect NPW from entering the RW system. The isolation valves and
double-check backflow preventer are to be housed in a vault with a drain line connectingthe
vault to the Bio-filter sumo svstem.
Cost Negotiation Process:
Ewing submitted CPR 20 to the City PM, City inspector, and B&C for their review and
comment. Backup documentation was provided to the reviewers. The proposed cost was
found to be appropriate for the scope of work and was recommended by BC. The CPR
cost was approved.
FinalCost=
Working Days=
CPR #21 PCV and NPW modification in Headworks building
Description Summary:
Revise the configuration of NPW and NPWC at headworks to coordinate with changes to
the expected available pressures from the new NPW pumping system.
$8,949.53
2
s23,58s.92
0
Reason for change
Meridian City Council Meeting Agenda December 4, 2018 – Page 240 of 445
Field Order 6 includes deletion of various pressure control valves as well as addition of
isolation valves for maintenance purposes and will require minor changes to piping
relative to what was shown on the contract drawings. The reason for the changes is to
match up with expected available pressures from the new (being designed at the time)
NPW pumping system.
Cost Negotiation Process:
Ewing submitted CPR 21 to the City Ptt/, City inspector, and B&C for their review and
comment. Breakdowns of labor costs, as well as material costs were provided. The
proposed time, for labor, and costs were reviewed and are considered to be in line with
the standard for this type of work. The proposed cost was found to be appropriate and
was recommended for approvalby BC. The CPR cost was approved.
FinalCost=
Days=
CPR#22 upsaze NPW tees from 4-inch to 6-inch
Description Summary:
The Ewing Company is directed to modify the connection detail as described in Keynote 5 on
drawing C-110-0011 and upsize the original 2 - 4-inch NPW tees to include 2 - 6-inch by 4-
inch tees to match the upsized 6-inch NPW line being installed as part of the Liquid Stream
Project.
Reason for change:
On March 14,2078, a coordination meeting was held with The Ewing Company (Headworks
Project) and JC Constructors (Liquid Stream Project) to discuss yard piping connections for
various piping systems shown on the drawings. During this meeting the interconnections on
the Non-Potable Water (NPW) system were discussed. The Clty had authorized an up-sizing of
a significant portion of the NPW system from 4-inch to 6-inch diameter on the Liquid Stream
Project after both projects were bid. This change was based on NPW system
recommendations completed as part of the Re-Use, NPW and Seal Water Pump Station
Project to meet future flow and pressure requirements in the NPW system.
Cost Negotiation Process:
Ewing submitted CPR 22lo lhe City PM, City inspector, and B&C for their review and
comment. Breakdowns of labor costs, as well as material costs were provided. The
proposed time and costs were reviewed and are considered to be in line with the standard
for this type of work. The proposed cost was found to be appropriate and was
recommended for approval by BC. The CPR cost was approved.
FinalCost=
Days=
CPR #24 Natural gas line extension to Headworks Building
Description Summary:
Construct a new natural gas service line from the lntermountain Gas owned main service
meter located near the Laboratory to the Headworks Building.
($1,423.70)
2
$899.80
0
Reason for change
Meridian City Council Meeting Agenda December 4, 2018 – Page 241 of 445
Through the design and early construction period of this project the City was coordinating
installation of this service line with lntermountain Gas. Service installations are in place at
the WRRF that are both lntermountain Gas and City owned. As lntermountain Gas was in
the determination phase of whether they would own this service or not, the gas line was
not included in the contract documents. Subsequently lntermountain Gas decided that the
City should install and own this service connection downstream of the main service meter.
Cost Negotiation Process:
Ewing submitted CPR 24 to the City PM, City inspector, and B&C for their review and
comment. Breakdowns of labor costs, as well as material costs were provided. The
proposed time and costs were reviewed and are considered to be in line with the standard
for this type of work. The proposed cost was found to be appropriate and was
recommended for approval by BC. The CPR cost was approved.
Final Cost=
Days=
CPR #25 Plant drain reroute per WCD #10
Description Summary:
Ewing is directed to change the discharge location for an existing plant drain pump station
that currently discharges to the secondary pump station and add flow metering.
Reason for change:
The existing plant drain pump station serves the Digester Control/Gas Booster/lron
Sponge building floor drains and the gas condensation low point in the4 gas piping. The
existing 3" force main needs to be rerouted to allow the secondary pump station to be
taken out of service. ln addition, flow measurement will be added because the new
proposed discharge location is upstream of influent flow measur3ement.
Cost Negotiation Process:
Ewing submitted CPR 25 to the City PM, City inspector, and B&C for their review and
comment. Breakdowns of labor costs, as well as material costs were provided. The
proposed labor and material costs were reviewed and are considered to be appropriate for
this type of work. The CPR cost was approved.
FinalCost=
Days=
CPR #26 backfill IPS with rock chips per WCD #11
Description Summary:
The purpose of this work change directive is to modify the backfill material and
requirements for the lnlluent Pump Station (lPS) structure due to safety and
constructibility concerns associated with the installed shoring system on the North and
South sides of the excavation. Materials Testing & lnspection (MTl) has recommended
placement of 3/4-inch crushed rock chips and geotextile fabric in these areas.
$26,652.12
6
$58,423.89
11
Reason for change
Meridian City Council Meeting Agenda December 4, 2018 – Page 242 of 445
Ewing planned to backfill the excavation by placing soil in lifts and compacting. This
would have required MTI employees to enter the excavation to verify adequate
compaction for each lift. MTI expressed concern about the safety of their employees
because they did not trust the shoring system that was installed by Ewing. Using crushed
rock eliminates the need for employees to enter the area. We decided that adding the
crushed rock to the contract would be the simplest solution to the dillema and minimize
delays to the project.
Cost Negotiation Process:
Ewing submitted CPR 264, which was an estimate, to the City PM, City inspector, and
B&C for their review and comment. The original estimate was for $16,310.06 based on an
estimated 620 yards of crushed rock. Work Change Directive 11 was issued based on
this estimate. The actual cost is based on the actual quantity of rock needed was 1017
yards. This was verified by the attached load tickets.
FinalCost=
Days=
$24,710.94
0
Meridian City Council Meeting Agenda December 4, 2018 – Page 243 of 445