2021-108 Airport Runway RehabilitationDate: December 10, 2021 Report No. 2021-108
INFORMAL STAFF REPORT
TO MAYOR AND CITY COUNCIL
SUBJECT:
Airport Runway 18L-36R Rehabilitation Update
BACKGROUND:
A preliminary engineering analysis for the Airport Runway 18L-36R Rehabilitation project was
procured by TxDOT Aviation to document existing conditions and recommendations for
improvements to the runway pavement meeting FAA guidelines. Information gathered from field
inspections, topographic surveys, and non-destructive pavement testing performed by the
engineering consultant, Garver, identified several areas of concern related to the FAA airfield
design guidelines. The existing runway pavement surface displayed significant cracking in the
asphalt on the south and middle portions of the runway. In addition to the pavement cracking
issues, the topographic survey revealed a need to eliminate a “hump” in the middle of the runway
that creates a line-of-sight issue not meeting FAA requirements.
The original project budget developed by TxDOT Aviation assumed a pavement rehabilitation mill
and overlay improvement of the full runway at an estimated project cost of $4,980,000. Mitigating
the severe asphalt cracking and line-of-sight issues in the runway would require a large area of the
runway to be reconstructed at an estimated project cost of $16,752,000. This significant increase
in project cost exceeds the available FAA discretionary fund allocated for this project in FY 2022
and requires a multi-phased funding approach.
DISCUSSION:
The FY 2022 improvements to Runway 18L-36R will shift from a full-length asphalt mill and
overlay to a reconstruction of the south 1,200 feet on the Runway 36R end. The second phase of
Runway 18L-36R improvements in FY 2025 will eliminate the line-of-sight issue in the middle
of the runway and complete the project. As a part of the reconstruction efforts within both phases
of runway work, the FAA requires airport infrastructure to meet current FAA design standards.
Implementation of these standards will reduce the current runway width from 150 feet to 100
feet. Even with the reduced width, the larger aircraft up to a 737 can still operate at Denton. The
reduced runway width will require the existing runway edge lighting system to be replaced at the
proper offset from the new pavement edge. The airport will be able to replace the aging electrical
infrastructure with energy efficient FAA approved LED lighting as a part of this project. TxDOT
Aviation is working with the FAA to develop a multi-year funding plan that will leverage the
current $4,980,000 in FY 2022 funding and secure the remaining $11,772,000 needed in FY
2025.
ATTACHMENT(S):
DTO Runway 18L – 36R Executive Summary
Date: December 10, 2021 Report No. 2021-108
STAFF CONTACT:
Scott Gray
Director – Airport and Facilities
Scott.Gray@cityofdenton.com
PRELIMINARY ENGINEERING REPORT EXECUTIVE SUMMARY
JULY 16, 2021
Denton Enterprise Airport (DTO)
Runway 18L-36R Pavement Rehabilitation
EXISTING CONDITIONS
PROPOSED PROJECT IMPROVEMENTS
EXISTING RUNWAY PROFILE ANALYSIS
645
650
655
660
665
670
645
650
655
660
665
670
STA: 118+50.00
%+00.0032.02PVI 122+50.50ELEV. 637.61400.00' VC
G1 = 0.31%G2 = 0.73%K = 960.98e = -0.21'128+00.00V. 634.34VT 132+00.00EV. 636.43TW A7TW A7TW A6TW A6TW A5TW A5TW A4TW A4TW ATW A
RW 36R-18LRW 36R-18L
TW A3TW A3TW BTW B TW A2TW A2TW A1TW A1TW A7TW A7TW A6TW A6TW A5TW A5TW A4TW A4TW ATW A
RW 36R-18LRW 36R-18L
TW A3TW A3TW A2TW A2TW A1TW A1625
630
635
640
645
650
625
630
635
640
645
650
105+00 110+00 115+00 120+00 125+00 130+00 135+00 140+00 145+00 150+00 155+00 160+00 165+00 170+00 175+00
5 FEET ABOVE RUNWAY
EXISTING RUNWAY PROFILE
RUNWAY 36R PAVEMENT END
RUNWAY 18L
PAVEMENT END
CRITICAL LINE
OF SIGHT
LINE OF SIGHT NON-COMPLIANT AREA
BELOW MINIMUM CROSS SLOPE (<1.0%) ABOVE MAXIMUM CROSS SLOPE (>1.5%)
PROPOSED RUNWAY RECONSTRUCTION LIMITS PROPOSED RSA GRADING LIMITS PROPOSED RUNWAY REHABILITATION LIMITS PROPOSED RUNWAY SEAL COAT LIMITS
PROPOSED UNDERDRAINS PROPOSED ELECTRICAL IMPROVEMENTS PAVEMENT DEMOLITION LIMITS
LEGEND
RUNWAY 18L-36R PAVEMENT REHABILITATION EXECUTIVE SUMMARY
COST SUMMARY OPTIONS
OPTION B PROJECT BREAKDOWN
PHASE 1
• RECONSTRUCT RUNWAY 36R END 100 FEET WIDE
FULL STRENGTH
• RE-ALIGN TAXIWAY A6 TO ELIMINATE NON-
STANDARD FOUR-NODE INTERSECTION
• RECONSTRUCT END CONNECTOR UP TO
PARALLEL TAXIWAY
• NO UNDERDRAINS
• KEEP EXISTING RUNWAY EDGE LIGHTS IN PLACE
• TEMPORARY ASPHALT SHOULDERS FOR THE
OUTSIDE 25 FEET (4-INCH ASPHALT ON 6-INCH
P-154)
• NO REHAB (MILL AND OVERLAY)
PHASE 2• RECONSTRUCT THE MIDDLE OF THE RUNWAY TO
ELIMINATE THE LINE OF SIGHT ISSUES• IMPLEMENT 100-FOOT WIDE RUNWAY
FULL LENGTH• REMOVE ASPHALT SHOULDERS FROM PHASE 1• INSTALL LED MIRLS FULL LENGTH• OVERLAY REHAB SECTIONS BETWEEN THE
RECONSTRUCTION AREAS FROM PHASES 1 AND 2• SEAL THE RUNWAY 18L END• INSTALL UNDERDRAINS
RUNWAY REHABILITATION (COMPLETED IN ONE PROJECT)
Description Construction Contingency (Approx 15%)Total
PHASE 1 AND PHASE 2 COMBINED $12,666,000 $1,900,000 $14,566,000
MOA FLIGHT CHECK $15,000 N/A $15,000
RA & MOA: RUNWAY 18L LOCALIZER STUDY $85,000 N/A $85,000
PROJECT ADMINISTRATION ITEMS (ONE PROJECT)
Description Total
ENGINEERING DESIGN $583,000
CONSTRUCTION ENGINEERING SERVICES (ADMIN., RPR, CLOSEOUT, MATERIALS TESTING)$729,000
TOTAL (OPTION A)$15,978,000
RUNWAY REHABILITATION (COMPLETED IN TWO PROJECTS)
Description Construction Contingency
(Approx 15%)Total
PHASE 1 $4,031,000 $605,000 $4,636,000
PHASE 2 $9,252,000 $1,388,000 $10,640,000
MOA FLIGHT CHECK $15,000 N/A $15,000
RA & MOA: RUNWAY 18L LOCALIZER STUDY $85,000 N/A $85,000
ENGINEERING DESIGN AND PROJECT ADMINISTRATION ITEMS (TWO PROJECTS)
Description Total
PHASE 1: ENGINEERING DESIGN $186,000
PHASE 1: CONSTRUCTION ENGINEERING SERVICES (ADMIN., RPR, CLOSEOUT, MATERIALS TESTING) $232,000
PHASE 2: ENGINEERING DESIGN $426,000
PHASE 2: CONSTRUCTION ENGINEERING SERVICES (ADMIN., RPR, CLOSEOUT, MATERIALS TESTING) $532,000
TOTAL (OPTION B)$16,752,000OPTION AOPTION B