HomeMy WebLinkAboutCHANGE ORDER NO. 1 TO CONTRACT WITH MCCARTHY IMPROVEMENT COMPANY FOR AIRPORT TAXIWAY A RECONSTRUCTION AND EXTENSION CONTRACT CHANGE ORDER NO. 1
AIRPORT Augusta Regional Airport Date September 15,2017
LOCATION Augusta,GA ALP No. 3-13-0011-038-039
CONTRACTOR McCarthy Improvement Company
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 No. Description Unit Unit Price Quantity Amount
X-105.12 Remove Pavement Markings SF $5.00 520 $2,600.00
P-209.2 Crushed Aggregate Base Course(12"Depth) CY $54.00 700 $37,800.00_
P-401.1 Asphalt Surface Course-Bid Alternate 3 TON $330.00 -400 ($132,000.00)
P-403.1 Asphalt Base Course(30%RAP under PCC TON $240.58 1,250
Pavement) $300,725.00
D-705.3 Underdrain Clean-out Type I EA $730.00 7 _ $5,110.00
—
D-751.6 Catch Basin,Type C EA $12,721.00 6 $76,326.00
D-751.7 Junction Box EA $15,830.00 1 $15,830.00
L-108.1 #8 AWG,5kV Power Cable LF $2.00 11,900 $23,800.00
L-110.1 1-way,2-inch PVC,Direct Bury Type U Electric LF $2.50 3,580
Duct Bank $8,950.00
L-110.3 4-way,4-inch PVC,Concrete Encased Type I LF $25.00 270
Electrical Duct Bank $6,750.00
L-125.4 Replace(E)Airfield Guidance Sign Panel BA $750.00 5 _ $3,750
This Change Order Total $349,641.00
Previous Change Order(s)Total $0.00
Original Contract Total $16,772,436.70
Revised Contract Total $17,122,077.70
The time provided for completion in the contract is(unchanged)(decreased)(increased). This document shall become an
amendment to the contractctand all provisions of the contract will apply.
Recomrnended by: IL.------*. /S 1'}
Christopher J.Birkmeyer,PE,Engineer &Hunt, a
(Mead Inc.)) Date
Approved by:
Georgia IL Sasser,Sponsor(Augusta Aviation Commission) Date
Accepted by( ' "" tj �4..........
9fis/1-?--
Contractor(McCarthy Improvement Company) Date
Approved by:
Federal Aviation Administration Date
NOTE: Change Orders and Supplemental Agreements require FAA approval prior to construction,otherwise no Federal i
participation can be granted.
CONTRACT CHANGE ORDER NO. 1 ADDENDUM
AUGUSTA, GEORGIA
Seller
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Hardie Davis Jr. Mayor ?;
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Approved as-to Form: - t / /. / 12 ////7
General Coun
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AIP NO. 3-13-0011-038-039 CHANGE ORDER NO. 1
AIRPORT Augusta Regional Airport LOCATION Augusta,GA
JUSTIFICATION FOR CHANGE
1. Brief description of the proposed contract change(s)and location(s).
Quantity Adjustments:
There are several items included in the orginal bid that need to be adjusted in order to cover the true quantities shown
on the construction plans to complete the approved project scope. These items include:
• X-105.12 Remove Pavement Markings
o Enhanced hold markings removal at TW Al
• X-209.2 Crushed Aggragate Base Course(12"Depth)
o Taxiway A2
• D-705.3 Underdrain Clean-out Type I
o Scattered throughout project
• L-108.1 #8 AWG, 5kV Power Cable
o Scattered throughout project
• L-110.1 1-way,2-inch PVC,Direct Bury Type II Elecric Duct Bank
o Scattered throughout project
• L-110.3 4-way,4-inch PVC,Concrete Encased Type I Electrical Duct Bank
o Scattered throughout project
• L-125.4 Replace(E)Airfield Guidance Sign Panel
o Scattered throughout project
There is one item that is being removed from the project in its entirety. This item includes:
• P-401.1 Asphalt Surface Course
o Taxiway A2
Extra Work/New Bid Item:
There are several items that were erroneously not included in the original bid that will be necessary to complete the
approved project scope. These items include:
• P-403.1 Asphalt Base Course(30%RAP under PCC Pavement)
o Taxiway A2
• D-751.6 Catch Basin,Type C
o Located at various locations along Storm Line C
• D-751.7 Junction Box
o Located approximately 160 ft from the end of Storm Line C
Changes to Construction Plans:
Sheets G-021 and Sheets G-041 —Survey Control. Revisions to the survey control table are required to provided
updated control point information for the construction of the project.
Sheets C-301 and C-302—Typical Sections. Typical sections revised to clarify limits of P-306 Lean Concrete Base
Course,P-209 Crushed Aggregate Base Course. This resolves a discrepancy between FAA Advisory Circular
I 50/5320-6F—Airport Pavement Design and Evaluation and the requirements of FAA Advisory Circular 150/5370-
10G Standards for Specifying Construction of Airports.
Sheets C-321 —Concrete Jointing Plans. Concrete joint reinforcement patterns updated to meet the current FAA
Advisory Circular 150/5320-6F—Airport Pavement Design and Evaluation that was published on 11/10/2016 after
bidding of the project.
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Sheets C-322 and C-324 Concrete Jointing Plans. Revised concrete joint patterns to provide a better end product based
on the construction methods proposed by the contractor.
Sheets C-081 and C-324—Project Geometrics. Revised limits of concrete along Taxway A2 to streamline construction
of the asphalt shoulders and taxiway lighting during limited working hours associated withnighttime closures of
Runway 17/35.
New Construction Specifications:
Item P-403 Hot Mix Asphalt(HMA)Pavements (Base,Leveling or Surface Course). This item is added to provide an
asphalt base course under the Taxiway A2 concrete pavement.
Item P-602 Bituminous Prime Coat. This item is added to provide a prime coat under the base course under the
Taxiway A2 concrete pavement.
Revised Construction Specifications
Item P-306 Lean Concrete Base Course. The Aggregate Gradation for Lean Concrete table has been revised to allow
the use of Gradation B.
2. Reason(s)for the change(s) (Continue on reverse if necessary)
X-105.12 Remove Pavement Marking: The additional quantity is needed to remove the enhanced centerline and hold
position signs that were not included in the original bid tabulation. Leaving the markings in place would cause them to
be out of compliance once the new alignment of the centerline for Taxiway A 1 implemented. This item is AIP eligible
due to the reconfiguration of Taxiway Al. The unit price for this item is reasonable since it is based on the existing
unit price for this item within Bid Alternate 2. The quantity of the item did not change substantially to justify
renegotiation of the original unit price.
P-209.2 Crushed Aggregate Base Course(12"Depth): The additional quantity is needed to correct an error in the
original bid quantity. The original bid quantity was based on calculations of a 6"depth as opposed to the approved 12"
depth required for the Taxiway A2 pavement section. The special pavement section for Taxiway A2 was necessary in
order to construct Taxiway A2 within the runway safety area of Runway 17/35 during night closures. This item is AIP
eligible as it is part of the Taxiway A2 pavement section. The unit price for this item is reasonable since it is based on
the existing unit price for this item within Bid Alternate 3. The work associated with construction of this material does
not substantially change so the unit price has not been renegotiated.
D-705.3 Underdrain Clean-out Type I: The additional quantity is needed to correct an error in the original bid
quantity. Constructing the underdrain system without these clean-outs could lead to problems with keeping the
underdrain clear of debris which could cause water to be trapped under the pavement section and compromise its
strength. This item is AIP eligible as part of the pavement system associated with Taxiway A. The unit price for this
item is reasonable since it is based on the existing unit prices for this item. The quantity of the item did not change
substantially to justify renegotiation of the original unit price.
L-108.1 #8 AWG,5 kV Power Cable; L-110.1 1-way,2-inch PVC,Direct Bury Type II Elecric Duct Bank; L-
110.3 4-way,4-inch PVC, Concrete Encased Type I Electrical Duct Bank and L-125.4 Replace(E)Airfield
Guidance Sign Panel: The additional quantities are needed to correct an error in the original bid quantity. New power
cable and its protection is essential to the longevity of the new lighting system being installed with this project. This
item is AIP eligible as part of taxiway lighting system associated with Taxiway A. The unit price for this item is
reasonable since it is based on the existing unit prices for this item. The major cost component of these items are the
materials themselves,therefore the increase in quantity does not have a signicant impact on the unit price.
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P-403.1 Asphalt Base Course(30% RAP under PCC) and P-401.1 Asphalt Surface Course: These item is needed
to complete the approved pavement section for Taxiway A2(see attached 5100-1 form that was submitted with the
Engineer's Design Report). This pavement section will allow for Taxiway A2 to be constructed within the Runway
17/35 safety area during night closures allowing this runway,which is necessary for commercial service operations,to
remain open during the hours of 06:30 to 22:30. This pavement layer was erroneously left out of the contract bid
documents and is needed to provided for a stabilized base under the P-501. Eleminating this layer would require a
modification to standards for the pavement section. This mix will also be used to replace the P-401.1 Asphalt Surface
Course that was planned to be used on the shoulders of Taxiway A2. This allows for reduced risks of delays of
reopening Runway 17/35 on a nightly bases. New specifications meeting the requirements of Advisor Circular
150/5370-1OG—Standard for Specifying Construction of Airports were developed for Item P-602 Bituminus Prime
Coat and Item P-403 Hot Mix Asphalt(HMA)Pavements(Base, Leveling or Surface Course)have been developed and
are attached to the Contract Change Order No. 1.
These items are AIP eligible as part of the pavement system associated with Taxiway A. The unit price for this item
has been evaluated against the original bid cost for P-401.1 for Bid Alternate 3 and is provides over a 25%reduction in
unit cost. Given that the proposed cost includes the cost to develop a new pavement mix design and the construction of
an additional test strip this cost is reasonable given the nature of the work being completed in small areas during night
closures.
New Bid Items associated with this change include:
• Item P-403.1 Asphalt Base Course(30%RAP under PCC)—per Ton
Items eliminated from the project with this change include:
• Item P-401.1 Asphalt Surface Course—Bid Alternate 3
D-751.6 Catch Basin,Type C and D-751.7 Junction Box: These items are needed to complete the storm sewer
system that is being reconstructed as a part of this project. These items were erroneously omitted from the contract bid
documents and are needed for the completion of the new concrete box culvert that drains the infield areas between the
Taxiway A extension and the existing ramp. These items provide for junctions and bends in the storm sewer and for
collection of surface drainage into the system. These items were included in the project technical specfications with the
original contract bid documents. These items are AIP eligible as part of the drainage system associated with Taxiway
A.
The unit price for this item has been evaluated against other projects in the area using similar material and has been
determined to be reasonable given the nature of the work being completed in small areas during night closures. New
Bid Items associated with this change includes:
• Item D-751.6 Catch Basin,Type C—per Each
• Item D-751.7 Junction Box—Per Each
Sheets G-021 and Sheets G-041—Survey Control. During design of this project the project coordinate system was
revised to accommodate AGIS survey that was performed to determine runway end coordinates. The coordinates on
the survey control sheet did not get updated when the project was moved to the new coordinate system. This error was
discovered during the intial stages of project layout and corrected information was provided to the Contractor.
Correcting this information on the plan sheets will safeguard against the errant control coordinates from being used
during the remainder of the project.
There is no cost to the project for this revision.
Sheets C-301 and C-302—Typical Sections. FAA Advisory Circular 150/5320-6F—Airport Pavement Design and
Evaluation requires that a minimum of a one foot overbuild be constructed under P-501 Portland Cement Concrete
pavement. However,FAA Advisory Circular 150/5370-1OG Standards for Specifying Construction of Airports
requires that the underlying surface layer under P-501 pavement be widened by three feet to support the paver without
any noticeable displacement. Due to the thickness of the P-306 Lean Concrete Base Course it is necessary to widen the
P-306 Lean Concrete Base Course from one foot as shown in the orginal construction plans to three feet to meet this
objective. Not widening the P-306 layer would destabilize the paver during placement of the P-501 pavement and
could jeapordize the smoothness of the final surface. Widening of the P-306 also requires that the P-209 Aggregate
Base Course that lies beneath the P-306 material also be widened to support the P-306 base.
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The anticipated increase in materials needed for this correction will fall within the 10%overrun of quantities as allowed
by the contract documents. Therefore,no changes to the quantities for these items has been proposed as a part of this
change order. The unit prices for increased quantities of P-306 and P-209 will be based on the existing unit prices.
Sheets C-321—Concrete Jointing Plans. FAA Advisory Circular 150/5320-6F—Airport Pavement Design and
Evaluation that was published on 11/10/2016 after bidding of the project. One of the changes made with this
publication was reinforcements of concrete joints where taxiways tie into runways. Additional reinforcement is now
required in these areas. There is no cost to the project for this revision.
Sheets C-322 and C-324 Concrete Jointing Plans. The Contractor has submitted their pavement layout plans for the
project. In that submittal is was propsed to move the construction thickened edge joints (A joints)that separate
Taxiway A from Taxiway A2 and Taxiway B by one panel to minimize the dowelled construction joints(E joints) for
the project. This method will allow for fewer passes by the concrete paver which will result in a smoother top surface
for the taxiways. The revised locations will not hinder the function of the joints. There is no cost to the project
associated with these revisions.
Sheets C-081 and C-324—Project Geometrics. The limits of concrete along Taxway A2 have been revised to allow
for the shoulders to maintain a constant width. By maintaining a constrant width for the shoulders the amount of hand
work in this area will be minimized which will increase productivity and quality of asphalt construction in this area.
This revision meets the requirements of FAA Advisory Circular 150/5320-6F—Airport Pavement Design and
Evaluation. This change reduces the risks of not having night work completed during the eight hour windows provided
to the Contractor for work within the Runway 17/35 safety area. This revision will reduce the cost of the project by
reducing the concrete pavement section that was originally designed to extend out into the shoulders.
New Construction Specifications:
Item P-403 Hot Mix Asphalt(HMA)Pavements(Base,Leveling or Surface Course). This item is added to provide an
asphalt base course under the Taxiway A2 concrete pavement. The specification meets the requirements of FAA
Advisory Circular 150/5370-l OG Standards for Specifying Construction of Airports with the exception that the use of a
material transfer vehicle is not required. This change was made due to the engineering judgement that the use of a
material transfer vehicle within the confined work areas that will be required to construct the asphalt base course will
be detrimental to the pavement structure. This base material will be placed in small runs that have been necessitated by
the eight hour construction windows allotted the Contractor for construction withinthe Runway 17/35 safety area.
Item P-602 Bituminous Prime Coat. This item is added to provide a prime coat under the base course under the
Taxiway A2 concrete pavement as a requirement of Item P-403 above. The specification meets the requirements of
FAA Advisory Circular 150/5370-1OG Standards for Specifying Construction of Airports with the exception that the no
specific payment will be made for this material. It will be incidental to the construction of Item P-403.1 Asphalt Base
Course(30%RAP under PCC)
Revised Construction Specifications
Item P-306 Lean Concrete Base Course. The Aggregate Gradation for Lean Concrete table has been revised to allow
the use of Gradation B. This will allow the use of high quality aggragate from a local quarry for this project. The
specification meets the requirements of FAA Advisory Circular 150/5370-1OG Standards for Specifying Construction
of Airports. There is no cost to the project associated with this revision.
Attachments:
• Item P-306 Lean Concrete Base Course
• Item P-403 Hot Mix Asphalt(HMA)Pavements (Base,Leveling or Surface Course)
• Item P-602 Bituminous Prime Coat
• Sheets G-021,G-041,C-081,C-301,C-302,C-321,C-322,and C-324
• FAA Form 5100-1 for Taxiway A2 from Engineer's Design Report
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