APA_Rehabilitate Taxiways C and D_Addendum Four.pdf

CENTENNIAL AIRPORT

AIP 3-08-0029-061-2024, 0XX-2025, 0XX-2026

REHABILITATE TAXIWAYS C AND D

ADDENDUM NUMBER FOUR

CENTENNIAL AIRPORT

AIP 3-08-0029-061-2024, 0XX-2025, 0XX-2026

REHABILITATE TAXIWAYS C AND D

ADDENDUM NUMBER FOUR

March 25, 2024

GENERAL

1. The Bid Opening date has changed. The updated Proposal Form included in this Addendum #4 shall be used for bidding.

Sealed bids for AIP No. 3-08-0029-061-2024, 0XX-2025, 0XX-206 at Centennial Airport, Englewood, Colorado, will be received by the Arapahoe County Public Airport Authority, 7565

South Peoria Street, Englewood, Colorado 80112, until 10:00 a.m., local time, on March 29, 2024, and then opened, read aloud and canvassed.

2. An updated electronic proposal form titled Addendum #4 has been uploaded to the bidnet website. Please only use this form for bidding.

CONTRACT DRAWINGS

1. PLAN SHEET: TD-C301 TAXIWAY D TYPICAL SECTIONS

REPLACE Drawing TD-C301 dated February 28, 2024, with Drawing TD-C301 dated March 25, 2024. Modify Detail 4 for Construct Taxiway S3 Typical Section by changing the thickness of

Subbase Course (P-154) from 12-inch minimum to 20-inch minimum.

2. PLAN SHEET: TD-CP501 TAXIWAY D1 JOINT DETAILS

REPLACE Drawing TD-CP501 dated February 28, 2024, with Drawing TD-CP501 dated March

25, 2024. Modify Detail 4 stating “CONCRETE AREA TO BE REMOVED AND REPLACED

ACCORDING TO SPECIFICATION P-101” Modify Note 3 to state “THE CAVITY SHALL BE

FILLED WITH MATERIAL PER SPECIFICATION P-101. ANY SPALL REPAIR

MATERIAL ON THE SURROUNDING SURFACES OFTHE EXISTING CONCRETE SHALL

BE REMOVED BEFORE HARDENING HAPPENS. COAT ALL SURFACES WITH TWO-

PART EPOXY JUST PRIOR TO PLACING MATERIAL.”

Total Pages of Addendum Number Four with Enclosures – 3 pages and a revised Addendum Four

Proposal Form excel spreadsheet.

Your acknowledgment that these clarifications/revisions have been incorporated must be noted in the

PROPOSAL submitted with your bid.

END OF ADDENDUM NUMBER FOUR

1 REHABILITATE TAXIWAY D TYPICAL SECTION

NTS

3 T-CAP CONNECTION TO EXISTING ASPHALT

NTS

EXISTING

ASPHALT

5'

NEW PAVEMENT EXISTING PAVEMENT

T-CAP CONNECTION TO MATCH

THICKNESS OF TOP LIFT

MILL EXISTING PAVEMENT TO A

DEPTH TO MATCH THICKNESS

OF TOP LIFT. VERTICAL SAWCUT

EDGE. PAVE NEW SURFACE

COURSE IN ONE CONTINUOUS

LIFT. PROTECT EXISTING

PAVEMENT TO REMAIN.

TYPICAL SECTION NOTES:

1. SURVEY WILL BE REQURIED BEFORE AND AFTER LIFT OF P-401

AT THE POINTS SHOWN ON THE PAVING PLANS.

2. TOP LIFT SHALL BE MIN 2" LIFT.

4 CONSTRUCT TAXIWAY S3 TYPICAL SECTION

NTS

A PAVEMENT EDGE GRADING DETAIL

NTS

PA

VE

M

EN

T

ED

G E

VARIES VARIES℄ TAXIWAY S3

1.5'

(TYP)

1.5'

(TYP)

TD-CU501

TD-CU501

CRUSHED AGGREGATE BASE COURSE

(12-INCH DEPTH) (P-209)

2 RAISE TAXIWAY D TYPICAL SECTION

NTS

VARIES VARIES

VARIES

RECONDITION AND RECOMPACT

EXISTING BASE COURSE (P-209)

ADDITIONAL CRUSHED AGGREGATE

BASE COURSE (DEPTH VARIES) (P-209)

VARIESVARIES

VARIES

VARIES VARIES

12.00' ± SHOULDERING

(SEE NOTE 1)

VARIESVARIES

NOTE:

1. ANY GRADING ALONG THE SHOULDER NECESSARY TO MATCH NEW PAVEMENT

EDGE SHALL MEET THE REQUIREMENTS OF THIS DETAIL AND T-905.

SHOULDERING TO MATCH PAVEMENT EDGE WILL BE PAID FOR UNDER T-905.

℄ TAXIWAY D

℄ TAXIWAY D

A

VARIES

5% MAX

VARIES

5:1 MAX

VARIES5:1 MAX

22.00' TSA

VARIES5% MAX

VARIES5:1 MAX

VARIES

5:1 MAX

22.00' TSA

VARIES

5:1 MAX

VARIES5:1 MAX

22.00' TSA

VARIES5% MAX

VARIES5:1 MAX

VARIES

5:1 MAX

22.00' TSA

TACK COAT BETWEEN LIFTS AND MILLED

SURFACE (P-603)

ASPHALT COURSE (6-INCH OVERALL DEPTH)

(P-401) (MINIMUM 2-INCH LIFT, MAXIMUM 3-INCH

LIFT THICKNESS)

ASPHALT

PAVEMENT

SEEDED

AREA

1.5" VERTICAL

DROP

SEPARATION GEOTEXTILE

(P-209)

UNDERDRAIN

TRENCH,

SEE DETAIL

(TYP)

UNDERDRAIN

TRENCH,

SEE DETAIL

(TYP)

TACK COAT BETWEEN LIFTS (P-603)

ASPHALT COURSE (6-INCH OVERALL

DEPTH) (P-401) (MINIMUM 2-INCH LIFT,

MAXIMUM 3-INCH LIFT THICKNESS)

ASPHALT COURSE (6-INCH OVERALL

DEPTH) (P-401) (MINIMUM 2-INCH LIFT,

MAXIMUM 3-INCH LIFT THICKNESS)TACK COAT BETWEEN LIFTS

AND MILLED SURFACE (P-603)

EDGE LIGHTS

MATCH

EXISTING

(SEE NOTE 1)

ASPHALT COURSE (6-INCH OVERALL

DEPTH) (P-401) (MINIMUM 2-INCH LIFT,

MAXIMUM 3-INCH LIFT THICKNESS)TACK COAT BETWEEN LIFTS

AND MILLED SURFACE (P-603)

12.00' ± SHOULDERING

(SEE NOTE 1)

A

A

5 ASPHALT WIDENING DETAIL

NTS

5' -0

" NEW PAVEMENT

GEOMETRIC EDGE

EXISTING PAVEMENT TO REMAIN

EDGE OF ASPHALT

12" MIN 12" MIN

RECONDITION AND RECOMPACT

EXISTING BASE COURSE (P-209)

VARIES

5% MAX

VARIES5% MAX

EDGE LIGHTS

EDGE LIGHTS

VARIES

5% MAX

NEW PAVEMENT

PROTECT EXISTING

UNDERDRAIN TO

REMAIN (TYP)

SUBBASE COURSE

(20-INCH MINIMUM DEPTH) (P-154)

(SEE NOTE 1)

PROTECT EXISTING

UNDERDRAIN TO

REMAIN (TYP)

NOTE:

1. ANY GRADING ALONG THE SHOULDER NECESSARY TO MATCH NEW PAVEMENT

EDGE SHALL MEET THE REQUIREMENTS OF THIS DETAIL AND T-905.

SHOULDERING TO MATCH PAVEMENT EDGE WILL BE PAID FOR UNDER T-905.

NOTE:

1. ANY GRADING ALONG THE SHOULDER NECESSARY TO MATCH NEW PAVEMENT

EDGE SHALL MEET THE REQUIREMENTS P-152 WITH THE TOP 6-INCHES OF

MATERIAL MEETING REQUIREMENTS OF T-905.

NOTE:

1. ADDITIONAL BORROW MATERIAL UNDER AREAS TO BE PAVED SHALL MEET THE REQUIREMENTS OF P-154.

2. ANY GRADING ALONG THE SHOULDER NECESSARY TO MATCH NEW PAVEMENT EDGE SHALL MEET THE REQUIREMENTS P-152 WITH THE TOP 6-INCHES OF MATERIAL MEETING REQUIREMENTS OF T-905.

UNCLASSIFED EXCAVATION (P-152)

(SEE NOTE 1)

FILENAME: PLOT DATE: PLOT TIME:

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FEBRUARY 28, 2024

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3/25/2024 10:52 AMWXYA8401-TD-C301

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2" M

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CONCRETE AREA TO BE

REMOVED AND REPLACED

ACCORDING TO

SPECIFICATION P-101

SAWCUT TO 2" MIN DEPTH.

SAWCUTS TO BE PARALLEL

WITH AND PERPENDICULAR

TO JOINTS

EXISTING CONCRETE

JOINT

3 SPALL REPAIR AT EDGE - PLAN

NOT TO SCALE

2" M

IN

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VARIES

EXISTING CONCRETE

PAVEMENT

CONCRETE AREA TO BE REMOVED

AND REPLACED ACCORDING TO

SPECIFICATION P-101

#4 HORIZONTAL BAR AT 12" O.C.,

TIED TO BENT BARS (SEE NOTE 5)

#4 VERTICAL BAR, BENT

AT TOP, DRILLED AND

EPOXIED INTO EXISTING

CONCRETE MINIMUM OF

6" (SEE NOTE 5)

SEE NOTE 4

WIDTH SHALL BE AT LEAST 2"

BEYOND THE WIDEST PART

OF THE SPALL BEING REPLACED

2" MIN

2" M

IN

CONCRETE AREA TO BE REMOVED

AND REPLACED ACCORDING TO

SPECIFICATION P-101

SAWCUT TO 2" MIN DEPTH.

SAWCUTS TO BE PARALLEL WITH

AND PERPENDICULAR TO JOINTS

4 SPALL REPAIR AT CORNER - PLAN

NOT TO SCALE

EXISTING CONCRETE

JOINTSPALL

SPALL

2" M

IN

SA

W C

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2" M

IN

C

O

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WIDTH

VARIES

2"

MIN

2" M

IN

SPALL

SAWCUT TO 4"

MIN DEPTH.

SAWCUTS TO BE

PARALLEL WITH

AND

PERPENDICULAR

TO JOINTS

EXISTING CONCRETE

JOINT

CONCRETE AREA TO BE REMOVED AND

REPLACED ACCORDING TO

SPECIFICATION P-101

C SPALL REPAIR AT CENTER PANEL - SECTION

NOT TO SCALE

5 SPALL REPAIR AT CENTER PANEL- PLAN

NOT TO SCALE

#4 HORIZONTAL BAR AT 12" O.C.,

TIED TO BENT BARS (SEE NOTE 6)

CONCRETE AREA TO BE REMOVED

AND REPLACED ACCORDING TO

SPECIFICATION SECTION P-101

WIDTH SHALL BE AT LEAST 2"

BEYOND THE WIDEST PART OF

THE SPALL BEING REPLACED

#4 VERTICAL BAR, BENT

AT TOP, DRILLED AND

EPOXIED INTO EXISTING

CONCRETE MINIMUM OF

6" (SEE NOTE 5)

B SPALL REPAIR AT EDGE/ CORNER - SECTION

NOT TO SCALE

B

B

C

SEAL JOINT JOINT SHALL BE SAWED

PER P-605, REMOVING

ALL EXISTING FILLER

1 CONCRETE JOINT SEAL REPAIR

NOT TO SCALE

A

6 JOINT DETAIL - CONCRETE TO ASPHALT

NOT TO SCALE

NOTES:

1. SILICONE SEALANT SHALL BE COMPATIBLE WITH PORTLAND CEMENT

CONCRETE AND ASPHALT CEMENT PAVEMENT.

EXISTING CONCRETE PAVEMENT

1/4" BEVELED EDGE (TYP)

REMOVE ALL CURING

COMPOUND AFTER

SAWCUTTING

4" ASPHALT

SURFACE COURSE

JOINT SEALANT (P-605) MATERIAL

1/4" ± 1/16" BELOW BEVEL

SEE JOINT DETAIL NOTE 1

BACKER ROD MUST BE COMPATIBLE

WITH TYPE OF SEALANT USED AND

SIZED TO PROVIDE THE DESIRED

SHAPE FACTOR AND SIZED FOR THE

JOINT WIDTH

SILCONE SEALANT (P-605)

DEPTH PER MANUFACTURE'S

RECOMMENDATIONS

1- 1/

4" M

IN

1/2" ±1/16" 0" TO -1/8"

REPAIR NOTES:

1. MAKE VERTICAL SAWCUT AT LEAST 2" OUTSIDE

THE SPALLED AREA AND TO A DEPTH OF AT

LEAST 2". SAWCUTS SHALL BE STRAIGHT LINES

FORMING RECTANGULAR AREAS. THE CONCRETE

BETWEEN THE SAWCUT AND THE JOINT OR LIGHT

CAN SHALL BE CHIPPED OUT TO REMOVE ALL

UNSOUND CONCRETE AND AT LEAST 1/2" OF

VISUALLY SOUND CONCRETE. OVERCUTTING IN

ANY DIRECTION IS NOT ALLOWED.

2. THE CAVITY FORMED FROM CONCRETE REMOVAL

SHALL BE THOROUGHLY CLEANED TO REMOVE

ALL LOOSE MATERIAL IMMEDIATELY BEFORE

FILLING THE CAVITY.

3. THE CAVITY SHALL BE FILLED WITH MATERIAL

PER SPECIFICATION P-101. ANY SPALL REPAIR

MATERIAL ON THE SURROUNDING SURFACES OF

THE EXISTING CONCRETE SHALL BE REMOVED

BEFORE HARDENING HAPPENS. COAT ALL

SURFACES WITH TWO-PART EPOXY JUST PRIOR

TO PLACING MATERIAL.

4. WHERE THE SPALL REPAIR ABUTS A JOINT, AN

INSERT OR OTHER BONDBREAKING MEDIUM

SHALL BE USED TO PREVENT BOND AT THE JOINT

FACE. A RESERVOIR FOR THE SEALANT SHALL BE

SAWED TO THE DIMENSIONS REQUIRED. THE

RESERVOIR SHALL BE THOROUGHLY CLEANED

AND SEALED. WHEN THE SPALL IS AT A JOINT, IT

SHALL BE SEALED PER SPECIFICATION SECTION

P-605.

5. SPALL REPAIRS WITH MORE THAN 1 SQUARE

FOOT OF AREA SHALL REQUIRE INSTALLATION OF

REINFORCING BARS. VERTICAL REINFORCEMENT

SHALL HAVE A MINIMUM PENETRATION OF 6" INTO

EXISTING PAVEMENT. EPOXY USED FOR

REINFORCEMENT SHALL MEET THE

REQUIREMENTS OF P-101 SPECIFICATIONS, AND

SHALL BE INSTALLED PER MANUFACTURER'S

RECOMMENDATIONS.

6. THE CONTRACTOR SHALL USE A TEMPLATE THAT

WILL PROTECT EXISTING PAVEMENT TO REMAIN

AND SHALL BE APPROVED BY THE RPR.

7. ALL JOINT THAT REQUIRE REPAIR /

RECONDITIONING SHALL BE WIDENED TO THE

FOLLOWING TOLERANCES:

1/2" EXISTING WIDENED TO 5/8" (+/- 1/8")

5/8" EXISTING WIDENED TO 3/4" (+/- 1/8")

3/4" EXISTING WIDENED TO 7/8" (+/- 1/8")

SEALANT MATERIAL 1/4" TO

3/8" BELOW SURFACE

PCC PAVEMENT SURFACE

BACKER ROD MUST BE COMPATIBLE

WITH TYPE OF SEALANT USED AND

SIZED TO PROVIDE THE DESIRED

SHAPE FACTOR

P-605 SILICONE SEALANT

PER MANUFACTURER'S

RECOMMENDATIONS

JOINT SEALANT RECESSED

1/8" ±1/16" BELOW TOP OF PCC

A CONCRETE JOINT SEALANT DETAIL

NOT TO SCALE

CONSTRUCTION JOINT

1/

4" M

IN

1/4" BEVEL

1/4"

1/ 4"

EXISTING

PCC PAVEMENT SURFACE

JOINT

1/4" BEVEL

2 1/4-INCH BEVEL DETAIL

NOT TO SCALE

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