MAHG_121191_Repair_Airfield_Storm_Drains_RFIs_Vol_2_Answers.pdf

MAHG 121191 Repair Airfield Storm Drains

Additional Reference material:

Related Solicitation, Drawings and Specifications.

Questions with Answers Volume 2:

1.In Section 00103, Page 00103-01, Part 1.1.A.II.b & d, the contract documents state that all water lines, power lines, and gravity sewer lines found to be in conflict with construction will be relocated or accommodated with a conflict box. Are we correct to assume that the costs for any required utility relocations or conflict boxes will be borne by the Government?

Answer:

Damage to utilities which are not marked or marked incorrectly within the job site shall be repaired by the contractor and reimbursed by the Government.

2.The total contract time is stated as 365 days while the safety and phasing plans have 30 days, 45 days, 30 days, and 30 days for all phases 1-4 respectively, with a note that this is shown only for planning purposes. Please clarify that the contractor will not be held to the days shown on the Safety and Phasing Plans?

The Contractor will not be held to the days shown on the Safety and Phasing Plans as the days are for scheduling purposes only. If the number of calendar days in a phase will be exceeded, the Contractor must provide at least seven (7) days written notice to the Contracting Officer and Base Operations.

3.At station 5+00 in area 10B on sheet RM-02, please verify the note concerning existing electrical for lights only requires replacement if damaged by this construction?

Yes electrical for lights are only to be replaced if damaged by construction.

4.CIPP Installation is governed by ASTM F1216 which allows water or air/steam installation. In the specification language, water is referenced, but air/steam is not. We would like acknowledgement that air/steam is permissible.

Hydraulic inversion shall be the only approved installation method as described in ASTM F1216 Part 7.4.1

5.The specifications require the CIPP to be designed as Fully Structural. If this is the case, we would need live load information to adequately design the thickness of the CIPP. Generally in RCP drainage pie, joints are the problem and the CIPP is designed partly deteriorated to accommodate the hydraulic and groundwater loads.

It is our understanding Live loads for Airports have been provided for Thickness design under engineering guidance document provided to the bidders.

6.We recommend the base should require design calculations to be submitted with the bid to confirm adequate thickness design, which in larger pipe as this, significantly drives material costs.

Contractor shall be responsible for determining conformance with project documents, calculations shall not be required to be submitted with bid package.

7.We recommend the CIPP Testing prescribed in the specification should also include thickness testing to assure the finished product meets the design requirement.

Plate samples shall be thickness tested per section 02765 part 3.04.B

8.Do the subcontractors need the Construction Quality Management Certifications?

Yes

9.Bypass Pumping in CIPP, Specifications state that slow shall not be interrupted or stopped. During installation the storm drain will be blocked by the nature of the installation. Bypass pumping these sizes of storm drainage pipe is usually cost prohibitive as the flow rates are undefined and unknown. Prudent construction practices are to install during windows of good weather as we have at the base in the past. We request that bypassing be the responsibility and at the discretion of the Contractor. As stated otherwise in the documents, the interruption of flows are to be discussed with the contracting officer in advance.

It is our opinion the contract language should not be modified. It is the responsibility of the Contractor to provide the necessary “bypassing” of storm sewer in the event rainfall occurs during the process of pipe lining.

10.As there are several sections of large diameter pipe under the taxiway and plane apron that are marked for replacement, would the Base consider allowing CIPP as a construction alternate on these lines? This would greatly reduce pavement disturbance as well as reduce construction time dramatically.

CIPP is used in the concrete pavement areas except in instances that slope is inadequate and/or pipe is unable to be rehabilitated.

11.Are the existing CCTV video's of these lines that would be available for viewing?

Yes existing CCTV’s are available.

12.Sheet ECD 01 drawing 47 shows 12" barricades, was 10" intended (standard size is 10")?

10” barricades are acceptable.

13.Will a LCNOI or SCNOI be required by contractor from MDEQ or will PAE provide?

Yes SCNOI is Required.

14.Will construction photographs be required per sec 01380?

Yes.

15.Will each crew be required to have radio contact with the control tower and if so will Air Force provide radios?

No there will be a free zone established and construction will be done under escort by PAE.

16.Will marking of all utilities be responsibility of base or contractor? Please clarify 00103 1.2

The base.

17.Will orange fence be required by runways when digging is close by. There is no real way of making it jet blast resistant or high wind.

l hazardous areas (such as excavations or stockpiled materials) on the airfield must be delineated with lighted barricades on all exposed (visible or accessible) sides.

18.Will phase 1 work be performed only at night?

Phase 1 A work can occur at any time while remaining outside all taxiway construction activity setbacks. Phase 1 B will only require night work while working within the runway construction activity setback (within 100’ of the runway).

19.Can contractors use water from hydrants?

Yes, and backflow preventer is required and meter is not.

20.Will all employees be required to take airfield safety course from Base Opps?

No

21.Will all employees be required to wear picture identification badges and if so will base supply?

No

22.This RFI is in regards to the requirement for Cured-in-Place-Pipe. I have a subcontractor available who could provide a proprietary HDPE culvert lining system which appears to provide the same or similar performance to

CIPP at a significant (30 - 40%) cost savings. Would the government be open to reviewing this product as an alternative to CIPP for this project?

CIPP is the only approved method for this project.

23.The construction duration for the Repair Airfield Storm Drains project is 365 calendar days. However, the drawings indicate a certain number of days for each phase. This is as follows:

Phase 1 – 30 days

Phase 2 – 45 days

Phase 3 – 30 days

Phase 4 – 30 days

This provides a total of only 135 days. Are contractors going to be held to the limited days indicated in each phase?

In reviewing the scope of work, the days indicated in each phase are insufficient for the work involved. Can the days for each phase be increased to a reasonable time for the work involved?

The durations in the safety and phasing plan are for scheduling purposes only and the contract duration of 365 days governs for the project. If the number of calendar days in a phase will be exceeded, the Contractor must provide at least seven (7) days written notice to the Contracting Officer and Base Operations.

24. Drawing 05 – The last note references the total contract time as 365 days and that the time referenced on drawings 06 thru 09 is for planning purposes only (135 days). Will liquidated damages be assessed on a phase by phase basis or on the overall contract time?

Liquidated damages will be assessed only on the overall contract time not phase by phase. The durations in the safety and phasing plan are for scheduling purposes only and the contract duration of 365 days governs for the project. If the number of calendar days in a phase will be exceeded, the Contractor must provide at least seven (7) days written notice to the Contracting Officer and Base Operations.

25. Drawing 02 – Reference is made to the government keeping the 20 low profile barricades in the summary of quantities. If more than 20 barricades are required on the project, will we only be required to provide 20 to the government?

Yes, if more barricades are required on the project, they will be provided to the government.

26. Drawing 48 – Typical Concrete Section With Reinforcement – Is the intention of the drawings to have all new

PCC reinforced? Please clarify note 3 since WWF and dowels are unrelated pavement embeds.

Reinforcing steel or equivalent WWF shall be used when joint spacing exceeds 20’. Dowels can be substituted for reinforcing steel where joint spacing is less than 20’.

27. Can you provide drawings for the new concrete pavement joint layout including the joint types to be used based on the details provided on drawing no. 48? For example, Type A, B1, D1 and E1 all depict how to tie new concrete to existing concrete. Please clarify which new concrete and existing concrete interfaces correspond with these details.

Drawing no. 12 through 19 show the approximate location of the joint layout for the existing concrete pavement.

However, additional concrete pavement may be affected due to the actual trench width needed by the Contractor to remove and install the drainage pipe and structures. The Contractor shall field verify the existing pavement joints to be replaced and adhere to Specification Section 02520 – Portland Cement Concrete for the joint pattern submittal required and Specification Section 03395 – Grade Calculation and Construction Staking prior to starting work.

Sawed dowelled contraction Type F, or construction joints Type D2 are everywhere except the exterior portions of a slab section. Any slab that is placed adjacent to existing concrete or asphalt must have an isolation joint

B1 and 25% thickened edge. Any slab that is placed adjacent to an unpaved shoulder must be tied horizontally Type

E1/2 to the adjacent row of slabs to prevent movement of the slab away from the pavement section overtime. Any slab that is placed adjacent to a drainage or other structure that has significantly different stiffness from the pavement slab must also be isolated from that substructure with a thickened edge and isolation joint

B1. Any odd shaped or irregular quadrilateral slabs must also be reinforced to prevent cracking over time as well.

See reinforced detail.

28. The Portland Cement Concrete Pavement specification 02520 seems to be geared towards a large quantity/high production concrete paving project. If a different specification cannot be provided, will you consider the following changes to the current specification?

i. 02520‐2.10‐A – It would be impractical to set up a portable concrete plant on site for this size project. Will local ready mixed suppliers all be eligible to supply concrete on this project if they do not meet the 15 minute haul time and central mix plant requirements?

i. The 15 minute haul time and portable concrete plant on site requirements will be waived for this project.

ii. 02520‐2.10‐E – The use of a slipform paver will be impractical on the majority of this project due to several factors (short length of lanes, grate inlets in lanes, varying widths and individual slab pours). Will the use of a roller screed and or vibratory screed be allowed as a primary paver for this project?

ii. Use of a roller screed and vibratory screed has resulted in issues related to uniform consolidation of concrete on some past projects. We will allow this method provided the Contractor submits a construction and testing plan to verify they will achieve proper consolidation of concrete throughout.

29. The quantity for pay item no. 32 on drawing no. 02 (399 lf) appears to be understated – the quantity of 48”

CIPP from pages 37, 38 and 45 is 717 lf.

The total length of 48” CIPP should be 697 linear feet, see Addendum No. 1 revised sheet IN_01.

30. Will this be a lump sum contract or are we to use the pay items on drawing no. 02?

This is a lump sum contract. Contractor is to bid the quantities he determines from the plans and specifications.

31. Drawing No. 47 – Type I Barricade Detail; Notes 1 and 4 appear to contradict one another regarding the spacing of the barricades. Please clarify which note is correct.

The barricades shall be spaced with 4’ gaps. Barricades can be reused throughout the phases.

32. Specification 01000‐1.6.C and 01000‐20.0 requires a 6’ chain link fence around laydown/staging areas.

Drawings 05 thru 09 require the use of orange snow fence around laydown/staging areas. Please clarify which is correct.

No chain link fence will be required on the project. Drawings 05 thru 09 are correct

33. Sheet 02, Summary of Quantities – Pay Item 39 Tie Downs and Static Grounds: A quantity is provided by there is not a location plan contained in the drawings to verify.

Tie downs and static grounds shall be field verified and Contractor shall replace all that are affected by

Construction. The quantity is approximate.

34. Sheet 02 Summary of Quantities – Pay Item 43 Low Profile Airport Runway Barriers with Solar Lights: The quantity provided conflicts with the required number based on the depicted locations on Safety and Phasing Plans.

Quantities must be determined by the Contractor. Not all locations are shown due to scale and barriers can be re-used for different phases.

35. Sheet 03 General Notes No. 8: References the contractor shall absorb all cost associated with damage utilities. If a utility is not marked by the base personnel and/or utility provider during the 103A process or unknown to either entities and damaged during construction; is the contractor still responsible for absorbing all cost?

Damage to utilities which are not marked or marked incorrectly within the job site shall be repaired by the contractor and reimbursed by the Government.

36. Sheet 03 General Notes No. 11: Does this note pertain to delays with other contractors that may be the result of the government?

The airfield will remain in operation during the project. Delays due to aircraft operations will not be cause for monetary claim or reimbursement. However, time will/may be added to the contract time to compensate for delays.

37. Sheet 03 General Notes No. 13: Is the contractor responsible for obtaining base specific permits/waivers (i.e.

Free Zone Waivers and Construction Waiver).

Construction waiver will be provided.

38. Sheet 03 Haul Routes and Material Storage Note 7: References marking access routes and storage areas. Please provide information related to type, size, and frequency as the pertinent information has not been provided in the drawings or specifications.

Orange snow fence shall be used to outline the perimeter of all staging areas. The locations are shown on the Safety and Phasing Plans.

39. Sheet 03 Security Note 9: Will the government provide radio or does the contractor need to provide. If provided by contractor is there required make/model that is required?

No. Area will be a free zone.

40. Sheet 03 Utility Note 3: References the contractor shall field verify exact location of utilities. However, this note conflicts with General Note 7 which references the contactor shall with PAE as to the exact location of utilities.

Please clarify this discrepancy.

The Contractor shall coordinate with PAE and any other outside utility company to determine the location of existing utilities.

41. Sheet 03 Utilities Note 6: What is the government approved location for obtaining water for construction activities.

Nearest Fire Hydrant and Government allows.

42. Sheet 03 Erosion Control Note 2: Reference the requirement to install and maintain silt fence around the perimeter of all vegetated areas. These is not contained in the erosion control plan and appears could be a FOD issue within the airfield environment.

Yes and will be evaluated for free zone requirements.

43. Sheet 06 Scope of Work Note references 30 calendar days for all work in Phase 1. Does this include the necessary cure time of 28 days for the new concrete pavement?

The durations in the safety and phasing plan are for scheduling purposes only. If the number of calendar days in a phase will be exceeded, the Contractor must provide at least seven (7) days written notice to the Contracting Officer and Base Operations.

44. Sheet 07 Scope of Work Note references 45 calendar days for all work in Phase 2. Does this include the necessary cure time of 28 days for the new concrete pavement, which will be required in two phases, 2A and 2B, which cannot be performed concurrently? Therefore, the pavement pours would have to be separate resulting in more total cure time.

The durations in the safety and phasing plan are for scheduling purposes only. If the number of calendar days in a phase will be exceeded, the Contractor must provide at least seven (7) days written notice to the Contracting Officer

45. Sheet 08 Scope of Work Note references 30 calendar days for all work in Phase 3. Does this include the necessary cure time of 28 days for the new concrete pavement?

The durations in the safety and phasing plan are for scheduling purposes only. If the number of calendar days in a phase will be exceeded, the Contractor must provide at least seven (7) days written notice to the Contracting Officer

46. Sheet 17 Concrete Slabs located with Area #17 at Sta 2+90 and 3+10 (north of pipe) and Sta 2+70 (south of pipe); Sta 4+70 (north and south of pipe) are not depicted to be removed; however, the proximity to the structure/pipe to be removed and the required depth for removal does not allow for trench box, shoring or embankment benching in accordance with EM 385-1-1 and safe construction practices. It is recommend to have an additional 5 slabs removed.

The slabs shown to be removed are approximate. Contractor to determine the number of slabs that will be affected by Construction. If additional panel removal is required, it will not be measured for separate payment.

47. Sheet 18 Concrete Slabs located with Area #22 at Sta 14+50 (north of inlet) are not depicted to be removed;

however, the proximity to the structure/pipe to be removed and the required depth for removal does not allow for trench box, shoring or embankment benching in accordance with EM 385-1-1 and safe construction practices. It is recommend to have an additional 2 slabs removed.

The slabs shown to be removed are approximate. Contractor to determine the number of slabs that will be affected by Construction. If additional panel removal is required, it will not be measured for separate payment.

Sheet 47 Type 1 Barricade: Note 1 references barricades to be spaces with 4’ gaps at locations indicated on the plans or directed by engineer. Note 4 references barricades must be places a maximum of 50’ apart with dual barricades and lights at corners and ends. The spacing requirement is conflicting and the safety and phasing plans that depict the location of the barricades do not provide additional guidance. Please clarify this discrepancy.

Barricades shall be spaced with 4’ gaps.

48. Sheet 48 Joint Details: Plan depict joints that shall be used in construction but guidance through a joint layout plan or specification has not been provided. Please provide clarification when and where detailed joint shall be used.

The Contractor shall field verify the existing pavement joints to be replaced and adhere to Specification Section

02520 – Portland Cement Concrete for the joint pattern submittal required and Specification Section 03395 – Grade

Calculation and Construction Staking prior to starting work.

49. Sheet 48 Type “B2” Thickened Edge: Depicts a 6’ shoulder to be graded at the edge of pavement but a slope has not been provided.

Sheet 48 has standard details that may or may not be needed as in this case. Refer to UFC Guideline UFC 3-260-02 when additional joints types or information is needed.

50. Sheet 48 Type “B3” Thickened Edge: References the thickened edge to be tapered from the match point of the existing pavement to the nearest joint (10’ minimum. Numerous slabs are 12.5’ to 15’, which would effectively create a thickened slab. In addition, this does not match the thickened edge detail (Fig 12-32) contained in UFC 3-

260-02 Pavement Design for Airfields.

Sheet 48 are standard details that may or may not be needed based on UFC Guidelines. It is not expected that every type of joint listed on the sheet will be encountered, but if encountered, the details provided are recommended for construction. The thickened edge detail (Fig 12-32) contained in UFC 3-260-02 can also be used.

51. Sheet 48 Typical Concrete Pavement Section: Detail references 650 psi flexural concrete pavement.

Specification 02520 Section 2.11A specifies 750 psi flexural strength. Please clarify discrepancy.

650 psi flexural strength is acceptable.

52. Sheet 49 Static Ground Detail: Note 2 references these will be used as exterior static ground points for Army rotator wing aircraft. Please clarify this discrepancy or provide a revised detail for Air Force aircraft.

Note 2 can be omitted since it doesn’t apply to the project.

53. Sheet 49 Aircraft Tiedown Profile Detail: Note 1 references if the tiedown is intended to also be used as a static ground. Please provide confirmation whether the tiedowns will be used as a static ground. If so, which tiedowns are to be static ground and will pavement markings be required to indicate static ground capabilities.

Contractor must field verify which tiedowns are intended to be used as a static ground that will be impacted by

Construction. Pavement markings to indicate static ground capabilities will be required unless waived by the

Contracting Officer.

54. On the "Repair Storm Drainage " project that bids tomorrow at Keesler AFB, will a single component self leveling silicon be permitted to seal the joints in the concrete pavement?

Silicone sealant which complies with ASTM D 5893 is permitted.