Attachment 13 MAHG 211127 Questions and Answers Amendment 2 20230823.pdf

MAHG 21-1127 Repair Apron 3 Amendment 2 Questions and Answers

1. Sheet 7 of the plan set shows a typical mooring eye detail. This detail appears to be for a static grounding rod. Please advise if this correctly depicts the materials to be used for mooring eyes.

Yes, the detail on the page 7 of 7 shows the details of typical Apron Mooring eye, however the final installation on the surface shall be identical to the existing one.

Please refer to the Aircraft Tiedown section, attached for the detail specification of the mooring eye details.

2. Sheet 3 of the plan set shows construction fencing to be installed around the work site. Typically, we see airfield approved low-profile barricades utilized for sectioning off work areas on an airfield. Please confirm that we are to use construction fencing.

Construction Fencing will be acceptable.

3. Please advise if crushed concrete that meets the required gradation can be used in lieu of crushed limestone.

Yes, if the required compaction can be achieved.

4. We are concerned with project POP. The newly installed concrete will need to be cured, which will be best achieved by curing compound rather than a visqueen or burlap covering (due to the logistics of keeping the covering wet and keeping it in place on the airfield). The airfield marking paint cannot be applied over the concrete curing compound until it has had sufficient time to dissipate (30-45 days). POP will be extended from 120 days to 150 days.

5. Are there any permits (other than the Dig Permit) and/or training required to complete this work on the airfield?

Yes, A SWPPP will also be required for this project, because of the proximity of the project site to the storm drains.

6. Are there any specific requirements regarding dust control while demolishing the existing concrete?

Dust and Debris Control: Prevent the spread of dust and debris and avoid the creation of a nuisance or hazard in the surrounding area. Do not use water if it results in hazardous or objectionable conditions such as, but not limited to, flooding, or pollution. Vacuum and dust the work area daily or as needed. Sweep pavements as often as necessary to control the spread of debris. Keep site wet in a manner to prevent ponding but prevent the spreading of dust.

7. What is the exact square footage of slabs to be demolished and replaced?

Contractors are responsible for verifying the dimensions of the slabs.

MAHG 21-1127 Repair Apron 3 Amendment 2 Questions and Answers

8. What is the exact number of new mooring anchors to be installed?

The updated Page 7 of 7 shows 6 mooring anchors installed.

9. Will the contractor be permitted use of the gate adjacent to the project site?

No, to use any other gates than the gate on Phantom Street, an escort is required. No escort is available for this project.

How To Install 3490 Type Aircraft Tie Down

1) Place the mooring eyes on sub grade and fill with sand to exclude concrete (6000 psi concrete recommended) . Pour the concrete and finish operation. Sand is easily washed out when paving is completed.

The mooring points, 3490 and 3490-A have ½” holes on the sides for reinforcing rebar rods. The 3490-B has 1-1/8” holes. Rebar can be threaded thru these holes if desired.

2) Bring to grade using a wood or metal stake inserted into the socket opening at bottom of Mooring Eye. Square socket design prevents displacement while concrete is being poured and, if required, the hole provides drainage to the subgrade after Mooring Eye is in place.

SECTION 34 73 13 Page 1

MAHG 21-1227- Apron3

SECTION TABLE OF CONTENTS

DIVISION 34 - TRANSPORTATION

SECTION 34 73 13

AIRCRAFT TIEDOWNS

11/19

PART 1 GENERAL

1.1 REFERENCES

1.2 SUBMITTALS

1.3 AS-BUILT DRAWINGS

PART 2 PRODUCTS

2.1 MATERIALS

2.2 MOORING DEVICES

2.3 CONCRETE

2.4 REINFORCING STEEL

PART 3 EXECUTION

3.1 MOORING POINTS IN NEW RIGID PAVEMENTS OR CONCRETE PADS

3.2 SAFETY

-- End of Section Table of Contents --

SECTION 34 73 13 Page 2

SECTION 34 73 13

AIRCRAFT TIEDOWNS

11/19

PART 1 GENERAL

This specification for mooring be coordinated with UFC 3-260-01, Airfield planning and Design.

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN WELDING SOCIETY (AWS)

AWS D1.4/D1.4M (2011) Structural Welding Code -

Reinforcing Steel

ASTM INTERNATIONAL (ASTM)

ASTM A615/A615M (2022) Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement

ASTM C94/C94M (2022a) Standard Specification for

Ready-Mixed Concrete

ASTM C309 (2019) Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete

ASTM C536 (1983; R 2018) Standard Test Method for

Continuity of Coatings in Glassed Steel Equipment by Electrical Testing

NATIONAL INSTITUTE FOR OCCUPATIONAL SAFETY AND HEALTH (NIOSH)

NIOSH 81-123 (1981) Occupational Health Guideline for

Chemical Hazards, (Vols. I, II, and III)

1.2 SUBMITTALS

Government approval is required for submittals with a "G" or "S" classification. Submittals not having a "G" or "S" classification are [for Contractor Quality Control approval.][for information only. When used, a code following the "G" classification identifies the office that will review the submittal for the Government.] Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

As-Built Drawings;

SD-06 Test Reports

SECTION 34 73 13 Page 3

Concrete;

SD-07 Certificates

Mooring Devices

Reinforcing Steel

1.3 AS-BUILT DRAWINGS

Submit as-built drawings that provide current factual information, including deviations from and amendments to the drawings and changes in the work, concealed and visible.

PART 2 PRODUCTS

2.1 MATERIALS

Do not use a combination of materials that forms an electrolytic couple, which accelerates corrosion in the presence of moisture, unless moisture is permanently excluded from the junction of such metals.

2.2 MOORING DEVICES

Cast mooring devices in ductile iron 80-55-06 in accordance with ASTM C536, unless otherwise indicated. Show the device in the contract drawings.

Submit certificates of compliance on the devices stating that the mooring devices meet the specified requirements.

2.3 CONCRETE

Submit complete concrete mix design including all cement, aggregate, and concrete tests and compliance certificates. Use concrete in accordance with the Section 32 13 14.13 CONCRETE PAVING FOR AIRFIELDS AND OTHER HEAVY-DUTY PAVEMENTS, ASTM C94/C94M. Use air entrained concrete having a minimum compressive strength of 6000 psi. Use concrete with the following properties: nominal maximum aggregate size of 1 in, air content of 6 percent, and a maximum slump of 4 in for drilled piers and 2 in for all other applications.

2.4 REINFORCING STEEL

Use reinforcing steel in accordance with ASTM A615/A615M Grade 40 or 60 for #4 tie bars and Grade 60 for #6 vertical bars. Weld steel into cages in accordance with AWS D1.4/D1.4M and insert securely in the piers, in position and alignment, as shown in the drawings, prior to concrete placement. Submit certificates of compliance stating that the reinforcing steel meets the specified requirements.

PART 3 EXECUTION

3.1 MOORING POINTS IN NEW RIGID PAVEMENTS OR CONCRETE PADS

Install the mooring device within plus or minus 2 in of the location shown on the contract drawings. Set the top of the mooring device within 1/4 in of the plan pavement surface elevation, but not higher than the pavement surface. Install the mooring device prior to placement of the concrete pavement. Place concrete and reinforcement in accordance with Section 03 30 00 CAST-IN-PLACE CONCRETE. Keep hand finishing of the concrete around the mooring devices to a minimum.

SECTION 34 73 13 Page 4

3.1.1 Cleanup

Control all operations to minimize the amount of dust, dirt, debris and laitance in the work area. Clean all dirt, dust, debris, or laitance from coring or concreting operations, from the pavement surfaces prior to final acceptance.

3.2 SAFETY

In addition to Safety Requirements contained in the Contract Clauses;

prevent employee respiratory, eye or skin contact with Portland cement.

Provide and require employees to use and dispose or clean the following in accordance with the provisions of the National Institute for Occupational Safety and Health NIOSH 81-123:

a. Impervious clothing, boots, and gloves.

b. Splash-proof safety goggles and face shields.

c. Respiratory protection equipment.

-- End of Section --

G. REED

J. BERGERON G. REED

MAHG21-112720 APRIL 2023K.PAHLAVAN

Repair Apron 3

N / A

N / A

PLAN VIEW LAYOUT

SCALE: 1" = 20'-0"

GENERAL NOTES

1. CONTRACTOR ENCOURAGED TO FIELD VERIFY ALL DIMENSIONS AND CONDITIONS PRIOR TO BID

AND START OF CONSTRUCTION. NOTIFY CONTRACTING OFFICER OF ANY CONDITIONS

DETRIMENTAL TO THE COMPLETION OF THE WORK AS DESIGNED.

2. PROTECT ALL ELEMENTS TO REMAIN SUCH AS EXISTING UTILITIES, FACILITY, ROADS, CURBS, DRIVES, SIDEWALKS, METAL CARPORTS, SOLID SOD, ETC. CONTRACTOR TO RESTORE ANY

DAMAGED ELEMENTS TO THE ORIGINAL CONDITIONS.

3. CONFINE ALL WORK TO SPECIFIC AREAS AS DESIGNATED IN THE SCOPE OF WORK AND

SCHEDULE.

4. REFER TO MATERIAL SPECIFICATIONS IN SCOPE OF WORK FOR REQUIREMENTS AND

APPLICATIONS.

5. PRIOR TO CONSTRUCTION THE CONTRACTOR SHALL LOCATE ALL UTILITIES, ANY UTILITY

ADJUSTMENTS, EXISTING OR PROPOSED, REQUIRED TO COMPLETE CONSTRUCTION IS THE

RESPONSIBILITY OF THE CONTRACTOR. THIS ITEM INCLUDES, BUT IS NOT LIMITED TO; THE

TEMPORARY RELOCATION OF EXISTING OVERHEAD POWER LINES. ALL WORK IN THE VICINITY

OF OVERHEAD POWER LINES SHALL CONFORM TO OSHA REQUIREMENTS AND ANY OTHER

APPLICABLE (LOCAL) SAFETY REQUIREMENTS. THE CONTRACTOR IS TO REPAIR ANY DAMAGES

TO EXISTING UTILITIES THAT ARE TO REMAIN IN SERVICE IMMEDIATELY AT NO ADDITIONAL

COSTS OR EXPENSE TO THE GOVERNMENT.

6. CONTRACTOR SHALL COORDINATE ACTIVITIES THROUGHOUT THE PROJECT IN A MANNER THAT

ALLOWS EMERGENCY ACCESS TO ALL EXISTING ROADWAYS AT ALL TIMES WITHOUT DELAYS TO

EMERGENCY VEHICLES RESPONSE TIMES.

7. CONTRACTOR IS REQUIRED TO GPS LOCATE ALL UTILITY LINES AND APPURTENANCES

IMMEDIATELY AFTER INSTALLATION FOR UPDATING RED-LINE AS-BUILT DRAWINGS MAINTAINED

ON-SITE BY CONTRACTOR.

8. ALL CRANES COMING ON BASE MUST BE FIRST COORDINATED WITH WITH COE/BASE TO GET

FULL EXTENSION AND EXPECTED DURATION. THIS MUST BE SUPPLIED TO THE AIRFIELD 6

WEEKS PRIOR TO CRANE'S ARRIVAL. CONTRACTOR MUST HAVE FAA TEMPORARY CRANE PERMIT

IN HAND PRIOR TO ANY CRANE ACTIVITY.

9. CONTRACTOR SHALL APPOINT A CONSTRUCTION SUPERINTENDENT, SUBJECT TO THE

APPROVAL OF THE CONTRACTING OFFICER, WHO SHALL BE PRESENT ON THE

CONSTRUCTION SITE AT ALL TIMES DURING WORKING HOURS WHILE JOB IS IN PROGRESS. THE

SUPERINTENDENT SHALL BE DESIGNATED THE RESPONSIBLE CONTRACTOR'S REPRESENTATIVE

WHO SHALL BE AVAILABLE ON A 24-HOUR BASIS. WHEN THE CONTRACTOR'S REPRESENTATIVE

IS NOT AVAILABLE ON THE CONSTRUCTION SITE, AN ALTERNATIVE REPRESENTATIVE SHALL BE

PROVIDED.

10. EROSION CONTROL DEVICES SHALL BE USED FOR THE STAGING AREA AND ANY MATERIAL

STOCKPILES WHEN NECESSARY TO CONTROL EROSION AND STORMWATER RUNOFF.

11. LIMITS OF CONSTRUCTION IS DEFINED AS THOSE AREAS AFFECTED BY THE CONTRACTOR'S

OPERATIONS INVOLVING EXCAVATION, EMBANKMENT AND FINAL GRADING REQUIRED TO

COMPLETE THE WORK IN ACCORDANCE WITH THE ELEVATIONS, GRADES AND SECTIONS SHOWN

IN THESE DRAWINGS.

12. CONTRACTOR SHALL UTILIZE EROSION CONTROL DEVICES AND PROCEDURES AS SET FORTH IN

MDOT STANDARD DETAILS, 2018 EDITION.

13. BE ADVISED THAT CONTRACTOR'S WORK MAY BE SUSPENDED WHEN LIGHTNING IS WITHIN 5

MILES.

14. CONTRACTOR SHALL MAINTAIN SAFETY PRACTICES THAT CONFORM TO OCCUPATIONAL SAFETY

AND HEALTH ADMINISTRATION (OSHA) REGULATIONS AND USACE SAFETY MANUAL EM385-1-1.

15. ANY VEHICLE BEING DRIVEN ON AIRFIELD APRON MUST BE DRIVEN BY AN AIRFIELD LICENSED

DRIVER. AIRFIELD DRIVING CLASSES MUST BE SCHEDULED AND TAKEN THROUGH AIRFIELD

OPERATIONS BEFORE AIRFIELD DRIVING LICENSE WILL BE ISSUED.

BUILDING 4278

Project AreasProject Area

K.PAHLAVAN C2

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Project Area

MOORING POINTS

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