HomeMy WebLinkAboutCO 01CHANGE ORDER # 1
AIRPORT.* Renton Municipal Airport DATE: 8 -02 -13
LOCATION: Renton, Washington GRANT #: 3-53- 0055 -024
CONTRACTOR: ICON Materials
This change order was prepared in accordance with FAA Program Guidance Letter 12 -03. A price
analysis was prepared and It is recommended that the FAA accept the analysis as evidence of
cost reasonableness.
You are requested to perform the following described work upon receipt of an approved copy of this
document or as directed by the Engineer:
Item
# Description
Use 1 -1/4 inch minus recycle
concrete as aggregate for CTB;
1 . Allow in -place mixing of CTB
Subtotal
State Sales Tax (9.5 %)
This Change Order Total
Previous Change Order Amount
Original Contract Amount
Revised Contract Total
Unit
Unit Price
Quantity
Amount
L.S.
"($18,562.50)
1
($18,562.50)
($18,562.50)
($1,763:44)
($20,325.94)
0
$5.460.424.21
$5,440,098.27
Recommended by _ Date: �J
Engine Reid Middleton, Inc.
Approved by: �4 1
Date:
Owner, City of R n /
Accepted by. S(� Date: �6 =
Con actor, ICON Ma ills
Accepted by.
Date:
e ral Aviation Administration
H:IDOC123ApOM007 Renton ?wa a Signaget'South Taxiway Construction \Change Orders \CO l.docx
CHANGE ORDER # 1
AIP PROJECT NO. 3 -53- 0055 -024
AIRPORT _ .Renton Municipal Airport LOCATION Renton, WA
JUSTIFICATION FOR CHANGE
This justification for change was prepared in accordance with FAA Program Guidance
Letter 12 -03
1. Brief description of the proposed contract change(s) and locations(s).
This change order consists of the following:
1. Allow in- place /on -site processing of CTB
2. Allow use of 1 -1/4" crushed recycled concrete as CTB material in lieu of P-
304 Gradation B
2. Reason(s) for the change(s) (Continue on reverse if necessary).
L Allow in- place /on -site processing of CTB
On June 13, 2013, ICON submitted a Value Engineering Proposal (VEP) for using in-
place processing of CTB in place of the specified off -site processing, delivery, and
placement of CTB. A copy of the VEP is attached. In -place processing of CTB
provides the following benefits:
- In -place processing allows for better grade control, better moisture content
control, eliminate joints due to material truck delivery, and provides a more
homogeneous CTB mixture.
- In -place processing lessens the exposure time that sensitive off -site processed
materials would be subjected to when being trucked to the project site.
- In the contractor's experience, in -place processing provides an equal or superior
product to off -site pug - milling and delivery.
The VEP by ICON for this proposal results in a total savings of $14,625.00. Based on
the allowable 50% split of the cost savings, this portion of the VEP results in a credit
to the Owner of $7,312.50.
2. Allow use of 1 -1/4" crushed recycled concrete as CTB material
On June 13, 2013, ICON submitted a Value Engineering Proposal (VEP) for using
recycled concrete aggregate (I -1/4" minus) in place of the aggregate material
specified Table 1 of Section P -304. Recycled concrete aggregate provides the
following benefits.
The aggregate interlock of crushed concrete provides the contractor with the best
opportunity of bridging the sensitive sub -grade until the CTB system is in place.
Use of recycled concrete aggregate compliments the in -place processing proposal
and provides a more stable work platform to work on than the sandy gradations, of
the standard P -304 aggregate..
Solo trucks can be used to haul recycled concrete rather than trucks and trailers
(due to the close proximity of recycling plant), thus reducing stress on Perimeter
Road.
N.IDUC123ApV101007 Re.r,,ton TW 8 & Si, Taxiway Construction \Change Orders \CO l.docx
The VEP by ICON for this proposal results in a total savings of $22,5,00.00
($37,125.00 - $14,625.00). Based on the allowable 50% split of the cost savings, this
portion of the VEP results in a credit to the Owner of $11,250.00.
The total VEP credit to the Owner for these two proposals is $18,562.50.
3. Justifications for unit prices or total cost:
Justification was prepared in `accordance with FAA program guidance letter 12 -03.
4. The sponsor's share of this cost is available from: Port Funds
5.1 If this is a supplemental agreement involving more than $2,000, is the cost estimate
based on the latest wage rate decision? Yes No NA —X
6. Has consent of surety been obtained? Yes Not Necessary X
7. Will this change affect the insurance coverage? Yes No X
8. If yes, will the policies be extended? Yes No X
9. Has this Change Order been discussed with FAA Officials?
Yes X No When 06/25/13 With Whom Peter Doyle
H.IDOC123ApIM007 Renton ;W B & SignageVSouth Taxiway Construction \Change Orders \CO l .docx
1 1
0 . 0
DESIGN DIRECTIVE
DD Number: 3
owner. Rentola 1 U_nJd1W Airport Contract:No: 3,534055 2,4 ..
Contractors )ICON Materials
Engineer. Reims ,f.htidd►eton. Inc.. Engineer's File No.: 112010.007.S
Project: Taxiwav 8 Svstwn Rehabilitation.- Smith Pnrtinn _"�"
3pedf ration Section: P-304 Para, : :See beta Drawing Ref: Detail:
A ftvalue engineering proposal was submitted by ICON for the use of imported I U inch minus Recycled Concrete to be used:as
the aggregate. Within the Cement Treated Base (CTB). Additionally the value engineering proposal, proposed mixing the,C M
matettala on :site. in place with soil stabilizedpuiverizer mobile equipment (as performed on thei North Taxiway B project). The
value engineering savings to the Airport is identified as $18,562:54.
Please proceed with the use of the use of imported 1 S4 inch minus Recycled Concrete. and on site mixing as idendfied in, the
value engineering proposal (Attached).
flit: Rem-P-304 specification for, Cement Treated Base Course will continue to be utilized for the work in:it's.entirety exoW as
modified here after to allow for the parameters of.the value engineering proposal.
The f6llowing arc additions to Specification Item P -304:
3042;1 AGGREGATE - Recycled Portland Cement Concrete (PCC) used for CTB shall consist of I 'Yk;inch minus consistent,
densely graded material. Table' 1 gradations for aggregate do not apply to the use of Recycled Portland Cement Concrete (p CC).
344.4.1 MIXING - Mixing of the CTB materials may take place on .site and on- grade, with soil stabilizerlpulvetizer mobile
equipment (as performed on the North Taxiway B project).
3.04 -4.2 HAULING — Tbe;CTB materials may. be hauled independently to the site and mixed on -site.
30443 PLACING CTB .materials shall be placed and processed on site with soil stabilizer /pulverizer mobile equipment (as
performed on the North Taxiway B project)'.
304.5.4 HANDLING; MEASURING, AND BATCHING — For C` B materials :processed on site, verification' of the cement
trpplieation.rate shall be.plerformed by the contractor (i.e. plate method or other means).
30445.6 PLACING - CTE materials shall be placed and processed on site with soil stabilizer %pulverizer mobile equipment (as.
performed on the North Tlaxiway B:project).
304 -5:9 CONSTRUCTION JOINTS — Construction joints may be eliminated. When adjoining ongoing. CIS materials to
previously placed and-cured CM materials; tie together by blending and processing the interface with soil stabilizer /pui'verizer
mobile processing; equipment.
304.6.2. ACCEPTANCE CRITERIA — Acceptance of CTB will be based on density, thickness, grade, and .surface tolerance:
'Where density testing: performed is inconclusive (due to cement or moisture content adjustments utilized with nuclear _gate D
6938 testing),,the engineer at their sole discretion may utilize compressive strength test results to evaluate the acceptabitity,.ot the
material in lieu of the.density test results. If utilizing compresaive strength test results, the material will be con6dered ^acceptat23e
and paid at 100% if the average compressive strength exceeds the requirements in 304 -2.2 and the compacted material its
observed to be firm and unyielding. Acceptance of material and further.pay factor adjusmtents based on thickness, grade, and
surface tolerance apply as specified in 304 - 6.2.2, 304 - 6.2.3, and 304 - 6.2.4, regardless of acceptance based on density orstrength.
'This value origin • ring proposal cost savings, and changes identified above will be incorporated in a future change order..
' r
Signed by: :2. ". Date: / � . l.%
RE't(I iddieaotl
CUNTRACit'
4iL RE3P0N8E (Soled —
one)
No Cobt Change Order
X Change Order with Cost Ad steam
,j11 , Andci
petal - Pricing as provided? summarized in 6/13/201`3 proposal:
Gump Sum credit (savings) of s18 :562:SO to be doductod i
from the final contract amount. 1
/� Renton MunitiDW .Airpott'CgntracfM.343.0035,24 '
/ 'taxiway B System Rehab. W South Portion Reconaaua
l;;esponse from;/ 4�op
2�r.r .� ��JateReturned: 717!2013 DesignDIreotive'No.3
* bavid (itiii Maierial�,(icneral Manager /Conanuioa Aei4Middlotoa File No: 232010;007 OpS
O Att cbmlmEs
cc: Owner
z
¢QO
N
O
4
Renton Municipal Ai rP
0 — Cit Y of Renton
Taxiway B System Rehabilitation -South Portion Reconstruction
Project No, 011 -2013 / AIP # 3 -53 -0055 -024
Value Engineering Proposal
Reid Middleton / City of Renton
DN Materials proposes to change the. P-304 specification in this contract (Cement Treated Base or CTB) to a modified P-
I specification used in City of Renton Contract No. 001 -2012 (Soil- Cement Base Course). Rather than use a specific
terial gradation and the defined methodology for processing the CTB, as contained in the P -304 spec., ICON proposes to
Sort consistent material (Recycled Concrete 1 -1/4" minus or Bank Run Gravel meeting the existing P -304 spec. gradation
and mix the materials on site, in place with the same soil stabilizer /pulverizer mobile equipment used successfully in for the
X01 specification on Contract 001 -2012. The change amounts to allowing on -site mixing rather than off -site processing.
on -site mixing allows for better grade control, better moisture control, elimination of joints due to material truck delivery
I a more overall homogenious final product. Preliminary mix designs have already been performed using recycled concrete
t achieves the strength specification shown in the P -304 specification.
BY: David Gent, P.E. DATE:6/13/2013
Kurt Addicott, PE — Director of Aviation Services
propose to credit the project for the above change in a lump sum amount of (detailed attached):
for use of 1 -1/4" minus Recycled Concrete or,'alternately,
xx for use of Aggregate Gradation B
have attached hereto Cost Estimate Detail Sheets Nos. - ICON Estimate/ Ground Up Design/ Process
ched.
foregoing amount covers all direct and indirect costs related to this change and to the effect of the change on
remainder of the project. CTB strength provisions of the P -304 spec. to remain, otherwise P -301
cifications would replace the P -304 spec. and be used for construction/ inspection purposes.
BY: David Gent DATE: 6/13/2013
Original Contract Sum: $5,460,424.21 Previous Total (w/tax)• $0.00
Original Sum Sales Tax: $518,740.30 This Change (Add): ($18,562.50)
Total Original Sum Plus Tax: $5,979,164.51 This Chanc
je Sales Tax (9.5%) ($1,763.44)
Previous Additions (w/tax): $0.00 Total This Change Plus Tax: ($20.325.94)
Previous Deductions (w/tax) $0.00 New Total (w/tax) $5,958,838.57
BY: DATE:
hereby accepts the foregoing proposal and authorizes the performance of the changes
ecified. This instrument constitutes a Change Order to the Contract only when authorizing signature is affix
AUTHORIZED BY:
Date:
Date:
•
ICON
ICON Value Engineering Proposal Worksheet
City of Renton/ Renton Municipal Airport
Taxiway B System Rehab, - South Portion Reconstruction
City Project No. 001 -2013 / AIP No. 3- S3 -OOS5 -024
Proposal: Change.13-304 (CTB) spec. to allow for on -site/ in place processing as performed on
City Project No. 001 -2012 (Taxiway B System Rehab. - North Portion)
Changes requested;
• Allow in= place/ on -site processing of CTB (as per P -301 standard in North Portion)
• Allow use of 1 -1/2" crushed recycled concrete as CTB material in lieu of P -304 Gradation B.
Alternate: use P -304 Gradation B
ICON Materials proposes to grade the subgrade under the pavement structure as
originally specified, then import non - cement treated 1 -1/4" minus crushed recycled
concrete, grade it to conform to the P- 304 / CTB design elevations (with allowance
for processing volume) then incorporate 8.0% cement using a soil stabilizer/
pulverizer mobile unit as previously used in the North Portion. Reconstruction project..
This.change allows for recycling of the concrete slabs to be demolished from the
site, shorter haul. times for the imported material, better moisture control of the
CTB on -site, less exposure to traffic delays for material delivery, better
homogeneity of-the CTB with in -place mixing and elimination of CTB joints.
The quality of the final CTB will be superior to importing processed materials from
off -site. Preliminary design using 1 -1/4" recycled concrete @ 8% cement are attached.
Preferred alternative Value Engineering proposal - 1 -1/4" Recvcled Concrete
Combined savings frowhaul/ I- t$4.95 e concrete use
- -
71500 tons @ per ton = $37,125.00
50%value Engineering Split. of Savn -
In -Place Mixing Savings Only (use P -304 Grading B, sup
ISavingsfrom haul exRMre only (using P -304 Gradatio
7,500 tons @ $1.95 per ton =
SO,% value Engineering Split of Savings =
P =304 to P -301 with Recycle 1 of 1
6/13/2013
Ground Up Road Construction,Inc qY;
1107140"' Ave Ct E. Sumner, WA. 98390 A;: w
Office: 253.891.1413 Fax: 253.891.1425 aoAn
µ" RECYCLE 4
May 13, 2013
Mr. Dave Gent
Icon Materials
1508 Valentine Ave SE
Pacific, WA 98047
Subject: ALTERNATE METHOD OF PERFORMING WORK
ITEM P -304 CEMENT TREATED BASE COURSE
TAXIWAY B SYSTEM REHABILITATION — SOUTH PORTION
RENTON, WASHINGTON
To Whom It May Concern:
Ground Up Road Construction., Inc. (Ground Up) has reviewed the project plans
and specifications regarding Item P -304, Cement Treated Base Course, for the
above referenced project and request that consideration be given. to the method
of performing this work. It is our professional opinion that the desired outcome
for the cement treated base course layer of the proposed pavement section could
be achieved with a mix in -place method and that the mix in -place method will
more adequately accommodate ongoing construction activities within the contract
timelines.
Preliminary laboratory testing has been performed in order to determine
approximate mix design to meet specifications and provide a reasonable cost
estimate. The following table includes results of compressive strength testing for
two proposed aggregate sources in order to meet the requirements of Section
304 -3.2 Mix Design.
Virain Crushed Raco rnmeree
Percentage
6 %
Additive
Cement
3 -Day
Compressive
Strength (psi)
200
7 -Day
Compressive
...Strength si
455
.6 %
Maxcem
215
550
IN
1070
10 %
Cement
390
10%
Maxcem
415
1020
44 Ground
Recycled Concrete
•
Up Road. Construction, Inc
1107140`h Ave Ct E. Sumner, WA. 98390
Office: 253.891.1413 Fax; 253.891.1425
Percentage
Additive
3 -Day
Compressive
Stren th (psi)
7 -Day
Compressive
Strength (psi)
6%
Cement
430
690
6%
Maxcem
390
705
Cement
.10 % 1
940
1090
10%
Maxcem 1
885
1020
U
±r':. ROAD +r:,
RECYCLE '' ?- ,.'`�`
All samples were prepared at 2 percent above optimum moisture content and additive percentages are based on dry
weight of material. Cement is Type 1/11 meeting requirements of 3042.2. Maxcem is Type 1 111 blended with GGBF Slag
meeting requirements of 304 -2.2 and 3042.3.
Relevant Experience:
Ground Up has successfully completed over 3,000 in -place stabilization projects,
including several airfield projects, and we will be providing the in -place soil'
cement base course on the north portion of the subject project.
An example of the level of accuracy that can be achieved with our method and
equipment is shown. with the Fairchild Air Force Base Runway 05 -23 Project,
completed June 2011 with Icon Materials. Our portion of the project included
providing a cement treated base course for the new runway, which included
approximately .12;000 tons of Portland Cement uniformly mixed to a depth of 1.2
inches for approximately 320,000 square yards. As you can imagine over this
size project, the existing subgrade soils were variable and required varying mix
designs to achieve the intended results along the way. Icon Materials prepared
the subgrade, which included a maximum of 20% pulverized AC pavement. We
worked closely with Icon Materials and the Geotechnical Engineer to ensure that
subgrade requirements were achieved while keeping, costs associated with
adding more cement than needed to a minimum. This project was specified to
be completed with a pugmill or mixed in -place (the method we are proposing for
your project) and included a '/° tolerance for mixing depth: The project was
successfully completed on time, physical properties were achieved, and
tolerances were met. A total of . 525 compressive strengths samples were
obtained in the field and were all in conformance with project specifications.
Strengths ranged from 510 psi to 1,370 psi. Additional information regarding this
project or any others that may be of interest can be provided upon request.
Proposed Equipment:
The proposed equipment to be provided by Ground Up for the Cement Treated
Base Course can provide a homogenous mix with accurately metered
Ground Up Road Construction, Inc FS
1107140`h Ave.Ct E. Sumner, WA. 98390 M&M .
Office: 253.891.1413 Fax: 253.891.1425
+��:��..,�, ROAD
RECYCLE
incorporation of cementitious additive as, it relates to the subject project at. least
equal to, if not better than a pugmill, and uniquely allows for ease in changing
mix proportion for varying soil conditions on the fly if -needed. The amount of
material that can be processed is substantially increased with this equipment,
when compared to a pugmill, and will more adequately accommodate ongoing
construction activities. The proposed equipment includes the following:
1) Mixing Unit — Soil Stabilizer /Pulverizer: The mixing units are CMI RS
machines, equipped with 8 -foot or 10 -foot wide drums, 18 -inch mix depth,
and metered and nozzled spray bars for control of water during
stabilization process.
Example Description: CMI RS 650, equipped with a. 500 gpm water
system.nozzled across the full width of the. rotor drum, 8 -foot wide -50 -inch
diameter rotor drum capable of in -place mixing to the depths required for
this .project. Machine has four rotor speeds, two- directional processing, .
equipped with slope control, equipped with fully computerized additive .
metering system. Approximate weight is 65,000 lbs, length is 312 inches,
width .is 118 inches, and height is 132 inches with exhaust stack-removed.
2) Cement Spreading Equipment: Custom —built spreading units with 20-
ton material capacity equipped with scales, foot meter, and metering.
Units are capable of achieving and maintaining material application rates
within the tolerance for this project.
Example Description: Custom- built Mack spreading unit with 20 -ton
product capacity, 6X6 air shift transfer case, 15 speed transmission,
sealed access hatches, dust filters, bag house dust collection,
hydraulically operated distribution system powered by. diesel pony motor
(controlled from cab); . spreader controls are located in cab and have
emergency shut off, dual augers supply product to distribution chamber
equipped with tachometers, weight scales on product tank with display in
cab, foot per minute meter with display in cab, spread rates from 0 - 250
pounds per square yard, distribution chamber has operational dust skirt
and vacuum dust collection system to reduce dust while spreading, 8 -foot
sectional distribution chamber to allow spread widths in 2 -foot increments.
3) Water Supply/Transfer Trucks) Water truck(s) will be either
International or Freightliner 4,000 Gallon water truck to supply water
directly into soil stabilizer during mixing in order to provide uniform .
moisture content of processed material..
r
Ground Up Road Construction, Inc'
1107140`h Ave Ct E. Sumner, WA. 98390 M.
office: 253.891.1413 Fax :253.891.1425 ROAD!
RECYCLE
Proposed Method of Performing Work -
Work related to the Cement- Treated Base Course, as defined by Section 304 of
the Project 'Specifications, is proposed. to be generally accomplished In the
following manner.
We understand that an 8 -inch lift of Recycled Concrete Base. Course will be
..Placed on existing .subgrade materials. The. specified. amount of. cementitious
additive will be added to the recycled concrete layer at the. specked rate.
Cement will be uniformly mixed in place to a depth of 8 inches and
simultaneously moisture conditioned to specified moisture content.
We trust that this provides the requested information. Additional references and
project. experience can be provided upon request. if you have any questions or
need additional information,, please contact our office.
Respectfully submitted,
Todd Brownson
Geotechnical Engineer - Estimator
Ground Up .Road Construction, Inc.
value Engineering considerations
•
•
Value Engineering considerations
Gent, David (ICON, OMG Northwest) [dave .gent @oldcastlematerials.com]
Sent: Friday, June 21, 2013 6:00 AM
To: Kurt Addicott
Kurt,
Here's a few items on my list of reasons that the VE proposals make sense:
Page 1 of 2
For the CTB:
* The delay in funding gives us less time to set up a pugmilling operation and therefore is an. added cost
to ICON we could not have anticipated at the time of the bid. We are waiving the potential impact claim
by putting forth the VE proposal.
* The in- place processing has proven itself to be at least as (we think superior to) effective as off site
pugmilling. There is no practical engineering reason to process off site if ICON prefers to process in
place. We are offering a credit regardless.
* The access routes to the airport are congested due to construction along the route (from our Auburn
site) and are not truck and trailer friendly. Processing on - site lessens the exposure time sensitive off
site processed materials will likely be subjected to
* In place processing will eliminate joint issues and will result in a more overall homogeneous CTB
mixture. We can better regulate moisture content and segregation when eliminating the long haul route.
Truck haul times (and traffic delays) plus in transit consolation and box to box segregation can be
eliminated with in -place processing.
* Using l -1/4" recycled concrete base course will compliment the in - place processing and will give us
a much more stable work platform than the sandy gradations in the P -304 spec. will. We can push out
the recycled concrete over sub grade that may be load sensitive which will minimize the need to remove
sensitive soils. The sensitive sub grade will be partially/ more effectively protected with the 8 inches of
crushed product over the grade.
The aggregate interlock of the crushed concrete will give us the best chance of bridging sensitive sub
grade until the CTB system is in place.
* Solo trucks can be used to haul the recycled concrete to the site rather than truck and trailers (due to
the closer location of the recycled material). This decreases stress on the airport perimeter road and will
likely save the airport some significant amount of road repair costs.
For the PG 70 -22 exchange to PG 64 -22:�
* Using PG 70 -22 in the base layers has little to no added structural pavement value. In the most base
view, money is wasted in using PF 70 -22 in the paved base course. Why not save the money?
* PG 70 -22 is not as readily available locally as PG 64 -22. In a time critical project, being less
vulnerable to binder supply issues is helpful.
* it is quite a bit more difficult to compact PG 70 -22 in cooler weather so we tend to avoid placing this
mix at night. The need to do so will diminish if the volume of mix using PG 70 -22 isr base lift less.
* The ability to use recycled asphalt pavement (RAP) in the base lifts is merely a cost saving measure.
ICON has routinely used 20% RAP for many years without any impact on the final quality of the mix.
The FAA recognizes that RAP use is not an issue in it's specifications for base lift paving.
https:// mail.reidmiddleton.com /owa/ ?ae= Item &t = IPM .Note &id= RgAAAACDpk8U Wj vIR... 6/21/2013
Value Engineering considerations
Page 2 of 2
0 0
* The funds saved by allowing these VE items will help to insure the project cost will be kept within the
current budget in the event unforeseen challenges arise during construction.
That's my list for your consideration Kurt. I hope this is of some value in your discussions today.
I apologize for any typos. This was all typed on my B1ackBerry.
Respectfully submitted,
Dave .Gent
ICON Materials
Direct (206) 574 -3903
Cell (206) 253 -4486
Dgent @oldcastlematerials.com
https:// mail.reidmiddleton,comlowal ?ae= Item &t = IPM .Note &id =RgAAAACDpk8U Wj vIR... 6/21/2013