RFI_1-62_FA440718R0003.pdf

RFI No.

Date

Received Question / Comment SME Response Response Date

Publish Action

Action Date

R0001 7-Mar-18

Sheet 49, Note 2 (Elect General notes) states: All open excavations shall be covered with metal plates or backfilled at the end of the shift. Does this note apply in paved areas only? Does it apply to grassed areas while waiting for the duct bank concrete to cure? Snow fence around open trenches would normally be provided at open trenches.

Snow fencing will suffice if area(s) have been designated contractor clear zones.

28-Jun-18 A01 3-Jul-18

R0002 7-Mar-18 Is the counterpoise to be installed in concrete? Please explain Elect. Eq. Note 1, Sheet 49 (3rd paragraph).

Per UFC 3-535-01, paragraph 12-1.6.1:

"If this is not practical, install counterpoise 4-6 inches above the duct or direct buried cable." It is deemed impractical to trench the counterpoise in a separate trench requiring additional asphalt pavement displacement and patching. Counterpoise shall be routed a minimum of 2 feet around light bases and other relevant equipment.

28-Jun-18 A01 3-Jul-18

R0003 7-Mar-18

Re: Sheet 107, Detail 4. If the counterpoise must be installed 24” from the base can in lieu of within the excavated / core drilled area for the light a huge amount of additional asphalt will have to be removed and replaced. Perhaps as much as $500,000 to $1 Million. Compare to Detail 1 on Sheet

107 (EL521) where counterpoise is over ducts. Can the counterpoise be placed over the PVC duct in asphalt patched areas?

See R0002 Response 28-Jun-18 A01 3-Jul-18

R0004 Revised

7-Mar-18

Sheet 99, Detail 2 shows the in-pavement R/W, T/W edge light detail. It seems to us that pouring the concrete around the light base to 4” below the asphalt level creates a tremendous amount of additional

(unnecessary) work. Pouring the concrete around the base up to finished asphalt grade would eliminate substantial extra costs to include asphalt coring, L868 Light base extensions, high strength non-shrink grout, and make keeping the snow plow ring at the proper height much easier.

Install in accordance with drawings, Sheet 99, Detail 2.

13-Jul-18 A03 13-Jul-18

R0005 7-Mar-18 Are the light bars on Sheet 69 at Stations

180 + 09.03 new or existing?

New 28-Jun-18 A01 3-Jul-18

R0006 7-Mar-18 On Sheet 80 Note K refers to Sheet CD301 for trenching in PCC. We believe Note K should refer to a different sheet.

Refer to sheet 41, Drawing # CP501.

Place counterpoise conductor in same trench. See R0002 Response.

28-Jun-18 A01 3-Jul-18

R0007 7-Mar-18 On Sheet 82 should horizontal directional drilling be shown for the 2-2”-for FO cable? (top right)

There are (2) existing 4" depth asphalt, 10' wide access roads in this area.

Contractor has the option to trench and patch.

28-Jun-18 A01 3-Jul-18

Request for Information (RFI) Subject Matter Expert (SME)

R0008 7-Mar-18

Sheet 6 (GP101) indicates the new duct bank coming from the vault crossing an existing short runway between the West

Ramp and T/W A. That existing runway is not shown on Sheets EC112 or EC113. Are we to bore under that runway via Horizontal Directional Drilling?

Contractor has the option to trench and patch across rarely used Foxtrot

Parking ramp. Match existing. Assume

8" HMA.

28-Jun-18 A01 3-Jul-18

R0009 7-Mar-18

With regard to questions 2 and 3 above we request better details on exactly how the existing R/W asphalt shoulder (11” HMA plus 6.5” HMA) are to be cut and patched.

Particularly with regard to counterpoise and 2” conduit placement.

For removal refer to CD501 Detail 1.

Contractor shall remove existing HMA , PCC and material required to maintain

3 1/2" conduit separation from excavation envelope and 5 1/2" spacing between conduits. Minimum depth to top of duct-bank is 2'.

28-Jun-18 A01 3-Jul-18

R0010 7-Mar-18 Sheet 107, Note 2 (last sentence) under

Detail 3, is confusing. Please clarify meaning.

Counterpoise shall be placed in same trench pertaining to structural pavements.

28-Jun-18 A01 3-Jul-18

R0011 7-Mar-18

Sheet 108, Please confirm whether or not the 2W2” R/W and 1W2” T/W duct banks in the existing 11” + 6.5” HMA shoulders are to have #4 rebar reinforcement for all edge light conduits.

Per note 1 sheet # 108, drawing EL522, reinforcement is only required under full strength pavements.

Reinforcement is not required in the shoulder areas.

28-Jun-18 A01 3-Jul-18

R0012 7-Mar-18

Sheet 38 (CD501), Does the Step 1 and Step 2 process apply to the 1W2” T/W and 2W2” R/W shoulder cutting and patching for the new edge lights?

Contractor shall remove existing HMA , PCC and material required to maintain

3 1/2" conduit separation from excavation envelope and 5 1/2" spacing between conduits. Minimum depth to top of duct-bank is 2'.

28-Jun-18 A01 3-Jul-18

R0013 7-Mar-18

From Drawing EC113 we cannot tell how far it is from MH01 to the AF Lighting Vault. Please show AF Lighting Vault location on EC113.

Distance from west ramp edge to AFLV is approximately 120'

28-Jun-18 A01 3-Jul-18

R0014 6-Jul-18

Are L-823 connectors (splices) required to be installed on every #6 L-824 5KV conductor cable in every HV manhole and HV handhole where the conductors pass through or can circuits pass through some of the manholes and handholes without splicing (at the contractors option)?

Contractor option per maximum cable pulling tension limitations.

9-Jul-18 A02 11-Jul-18

R0015 6-Jul-18 Do the equipment ground conductors require cable tags as shown on drawing

EL501?

No. 9-Jul-18 A02 11-Jul-18

R0016 6-Jul-18

Is the #4 counterpoise conductor to be installed with all ductbank runs? Drawing

EG001 “Electrical Equipment Notes” 1 indicates that the counterpoise is only required along with primary series circuits supplying power to airfield lighting equipment. Drawing EL521 “Notes” #3 contradicts this indicating that the counterpoise shall be installed with all duct banks. For example, does a counterpoise need to be installed with the ductbank that is run to the control tower containing only

FO cable?

Counterpoise is required for primary series circuits supplying power to airfield lighting equipment.

9-Jul-18 A02 11-Jul-18

R0017 6-Jul-18

Drawing EG001 “Electrical Equipment Notes” paragraph 5 indicates that counterpoise ground rods shall be out of sync with base can ground rods by 500 feet.

How can that happen when base cans for R/W lights are 200 feet apart?

Follow direction that counterpoise ground rods shall be spaced no more than 1000 feet.

9-Jul-18 A02 11-Jul-18

R0018 6-Jul-18 Where does the counterpoise terminate or go when it gets to MH-01?

Terminate with ground rod at MH-01 9-Jul-18 A02 11-Jul-18

R0019 6-Jul-18

Does the counterpoise need to be installed with ductbanks that are routed in pavement such as for ALSF-1 centerline approach lighting?

Yes. Refer to R0010 Response 9-Jul-18 A02 11-Jul-18

R0020 6-Jul-18

How should the counterpoise terminate at the end of ductbank/conduit runs? The only definitive indication in the contract documents is to install a ground rod at every 1,000 feet. Should every counterpoise run have a ground rod installed at the very end of the run?

Yes. 9-Jul-18 A02 11-Jul-18

R0021 6-Jul-18

In regards to the above questions regarding the counterpoise, could a set of drawings be provided that show the routing of the counterpoise and where the ground rods are to be installed?

Contractor to follow direction per notes, details and drawings.

9-Jul-18 A02 11-Jul-18

R0022 6-Jul-18

For the manholes and handholes as shown on drawings EL532 and EL535, does the 4” thick concrete apron need to be installed around the entire perimeter of the manholes and handholes? Also, the handhole apron is specified to be 3 foot wide, but the manhole apron width is not specified.

Please specify the width.

Yes. 3' is Typical 9-Jul-18 A02 11-Jul-18

R0023 6-Jul-18 Do the L-824C cables need to have fireproof tape installed in manholes and handholes?

No. 9-Jul-18 A02 11-Jul-18

R0024 6-Jul-18

Are the existing underground lighting circuit conduits direct buried or concrete encased? Are they PVC conduit, GRS conduit, or other material? Specifically, we are concerned about the existing runway edge light and taxiway edge light circuits.

The new 2x2” concrete encased duct bank is shown to be installed in the same location where the existing underground lighting conduits are located and we are concerned about what will be encountered when excavating for the new ductbank.

Best available information is direct buried PVC conduit.

9-Jul-18 A02 11-Jul-18

R0025 Revised

6-Jul-18

Is railroad protective liability insurance required for the work to be performed on the southeast side of the runway (drawing EC110)? If so information will have to be provided by the government prior to bid time about the railroad in order to get a quote from insurance carriers (railroad company, number of trains per day, speed, etc.). Will railroad flagmen be required and who will provide them?

The government is applying for RR ROE access and is providing the application instructions for informational purposes only. No flagman are required unless work is being performed within 50 feet of RR centerline. Offerors shall plan accordingly.

13-Jul-18 A03 13-Jul-18

R0026 13-Jul-18 What is meant by “flagger crossing procedure” shown on drawing GP103?

Airfield Operations personnel will train contractor personnel on airfield procedures and control tower communications when it is required by the contractor to cross active taxiways or other airfield clearance requirements.

18-Jul-18 A04 24-Jul-18

R0027 13-Jul-18

Should horizontal auguring or boring of steel casing be considered for “directional boring” shown with duct banks with a large number of conduits such as runs with 12 to 24 conduits? If so, can a specification or detail be provided for the casing work.

Also, can the spacing between conduits be reduced on bores?

Follow guidance on Drawing EL523, Sheet 109 of 147, Details 1, 2& 3.

18-Jul-18 A04 24-Jul-18

R0028 13-Jul-18

Are the 365 calendar days for project completion only for phase 1? If phase 2 is awarded, how many additional calendar days will be granted?

Offeror's are not limited to 365 days to perform the work. Offeror's shall propose the number calendar days for each phase.

18-Jul-18 A04 24-Jul-18

R0029 18-Jul-18

The contract drawings indicate that the conduits in the duct bank should have 5- 1/2” spacing between the conduits. For manufacturers of duct bank spacers, the standard largest size of a duct spacer is one with a 3” spacing between the conduits.

Can the distance between the conduits in the duct bank be reduced to accommodate standard size spacers. Not only will this reduce the cost of fabricating the spacer, but also save in additional concrete quantity and excavation/backfilling for the duct bank.

3" standard size spacers are acceptable. 18-Jul-18 A04 24-Jul-18

R0030 18-Jul-18

Specification section 33 05 23.13 “Utility Horizontal Directional Drilling” specifies a sophisticated guidance system in paragraph

3.1.5. Can radio transmitter “walk-over”

system such as Subsite TK Recon be utilized for guidance in lieu of a wireline and “tru-tracker” magnetic guidance systems? Also, paragraph 2.2 indicates that the location of the bore shall be made every 2” along with other information.

Does the logging of the location need to be this precise or can location be provided at every 3-5 feet?

Radio Transmitter system and locates every 3 feet is acceptable.

18-Jul-18 A04 24-Jul-18

R0031 19-Jul-18

Sheet EG001, Elect Gen note 2 says all open trenches shall have steel plates or backfill – no open excavations at end of work shift. Does this apply to R/W and

T/W edge light trenches in the shoulders?

See R0001 Response 23-Jul-18 A04 24-Jul-18

R0032 19-Jul-18

Regarding sheet EL522 – center to center duct measurements are shown as 7 ½”. We believe that is in error for ductbanks with

2” conduits. 7 ½” center to center duct spacing is correct to achieve 3” concrete encasement with 4” duct. For 2” ducts to achieve 3” concrete encasement the center to center duct measurement is 5 ½”.

Spacers to achieve 7 ½” center to center spacing on 2” ducts are not available.

Specifications agree with our reasoning calling for 3” off concrete between ducts.

Which is correct?

See R0029 Response 23-Jul-18 A04 24-Jul-18

R0033 19-Jul-18

Sheet EC103 call out I (circled) points to T/W and R/W new conduits under existing shoulders (in 2 locations). Keynote I (circled) says see sheet EL522, detail 2 for trenching in HMA pavement. However, detail 2 on EL522 refers to trench in non-paved areas. Please provide correct detail reference.

EL 522, detail 2 for asphalt shoulders should be modified from 6" of top soil to minimum 4" HMA and additional 2" of compacted backfill to match existing shoulder pavement.

23-Jul-18 A04 24-Jul-18

R0034 19-Jul-18

The new R/W edge light center line (and duct bank center line) are 5’ from the R/W edge. The existing R/W Edge lights are about 7’ from the existing runway edge.

Depending on type existing edge lighting duct (or duct bank) these two could be too close together. Can the new edge lights be closer than 5’ from the runway edge?

No. Edge lights are to be placed at 5' from runway/load bearing pavement edge. Best available information is existing airfield lighting circuits are in direct buried PVC conduit(s).

23-Jul-18 A04 24-Jul-18

R0035 19-Jul-18

Sheet CD501 where does detail 1 apply?

We believe it applies to the overrun pavement only and not the shoulder pavement.

Contractor to only remove/cut existing shoulder asphalt required to install new ductbanks and conduit.

23-Jul-18 A04 24-Jul-18

R0036 19-Jul-18 Will the Air Force pay for stored materials on this project?

Typically the government will pay for on site stored material once confirmed by government personnel.

23-Jul-18 A04 24-Jul-18

R0037 19-Jul-18

Amendment 0001, R0002 states the #4 counter poise is to be a minimum of 2’ around light bases…this is not possible. At light bases where the core drill and concrete base diameter is 24” as shown on sheet EL502 or 30” on sheet EL503. The counterpoise will be within 6” of the light bases at those locations.

Reference drawing EL521, sheet 107 of 147, detail 4.

23-Jul-18 A04 24-Jul-18

R0038 19-Jul-18

Reference Amendment 0001, R0009 indicates 5 ½” spacing between conduits.

We assume that dimension is “center to center” and 3” between ducts as stated in section 26 56 20.00 01, para 3.5.3.

See R0029 Response 23-Jul-18 A04 24-Jul-18

R0039 19-Jul-18

Drawing A-1 issued with amendment 0003 has a LEGEND in the bottom right hand corner. The last item in the legend refers to Tertiary/Non-Load-Bearing pavement (See

A-5). Can we get a copy of sheet A-5?

Yes. Contractor to assume 4" AC shoulders. Reference attachment A-5.

24-Jul-18 A04 24-Jul-18

R0040 19-Jul-18

Section 26 56 20.00 10, paragraph 2.3.5 specifies Lightning Arresters. We assume they are for series lighting circuits?.

Quantity and spacing of the arresters is not shown on the plans. Are they required? If so, please provide spacing on the series circuits so we can determine quantities.

Items not indicated on plans/drawings are not included.

23-Jul-18 A04 24-Jul-18

R0041 19-Jul-18

Taxiway lighting work is part of Phase 2, and is a bid option according to the bid forms. How long do prices have to be held firm for award of Phase 2 as an option? 120 days per the solicitation or longer?

Pricing for Phase 2 shall be good through 31 DEC 2018.

24-Jul-18 A04 24-Jul-18

R0042 19-Jul-18

Details on sheets EL532 and EL535 indicate the precast handholes and manholes to be cast as monolithic structures. As precast structures, this may not be possible, especially for the manholes unless they are cast in place.

Sectional precast Manholes/Handholes are acceptable per size limitations.

Contractor to provide adequate sealant between sections where required.

23-Jul-18 A04 24-Jul-18

R0043 19-Jul-18

Sheet EL 503, Detail 1 & 4 “Elevated Runway / Taxiway Edge Light Detail” The detail shows an L-868B light can with a conversion ring to an L-867B. Can an L- 867B can be used in lieu of the L- 868B can? This would eliminate the need for the conversion ring.

Install per detail #1 and #4. 23-Jul-18 A04 24-Jul-18

R0044 19-Jul-18

Sheet CD301 Phase I indicates the depth of existing asphalt & Concrete on the Runway and Overruns. There is not a detail showing the depth of asphalt on the shoulders of the Taxiway in Phase II. What is the existing depth of the shoulders for the Taxiways in

Phase II?

Contractor shall assume 4" AC 23-Jul-18 A04 24-Jul-18

R0045 19-Jul-18 Does a Transfer Vehicle need to be utilized for Shoulders, Patching and Overrun Asphalt Paving operations?

No. Not required. Contractor discretion. 23-Jul-18 A04 24-Jul-18

R0046 19-Jul-18 Does the 400 foot test strip for Concrete patching need to be constructed?

Requirements of section 32 13 11 paragraph 1.3.6 are not relevant to this project.

23-Jul-18 A04 24-Jul-18

R0047 19-Jul-18 There is a contradiction on the dowels. Do they need to be epoxy coated or plain steel.

Plans/specs identifies both.

Contractor option. 23-Jul-18 A04 24-Jul-18

R0048 19-Jul-18

Can vibratory Morrison screeds be used for apron and overrun concrete installation.

This is acceptable in the UFC but these specs aren’t clear.

Yes 23-Jul-18 A04 24-Jul-18

R0049 19-Jul-18

Is hot pour joint sealant acceptable for concrete joint sealant? The spec is calling for cold pour but Scott AFB currently uses hot pour material to seal concrete joints.

Contractor Option. 23-Jul-18 A04 24-Jul-18

R0050 19-Jul-18

Is broom finish acceptable on concrete slabs and patches. UFC for concrete repair sites broom or burlap acceptable for surface finish on concrete repairs.

Yes 23-Jul-18 A04 24-Jul-18

R0051 20-Jul-18

Phase II, Sheet EC115 shows what appears to be shoulders on the inside of the islands.

We believe these areas do not have a concrete or an asphalt shoulder. Please confirm that our assumption is correct. We also believe the government's intent is not to install new asphalt shoulders. Please confirm this assumption is also correct.

Yes and Yes. 23-Jul-18 A04 24-Jul-18

R0052 2-Jul-18

We note in the project specifications that there are a number of sole sourced proprietary airfield electrical requirements.

Those are the:

L829 switchgear regulators L890 control system upgrade

We are requesting that these items be listed in the bid tabulation as an allowance item with a predetermined cost to any contractor that is bidding the project. By providing these items as allowance items the balance of the material can be competitive bid providing the Base with the most competitive pricing in the market. Without segregating these items in the bid with a predetermined cost there is little point in any other airfield lighting manufacture quoting the project and the Air Force will have to take any price the sole source manufacturer elects to provide.

We replaced the regulators and control system on a previous project. The contractor does not need to supply any additional switchgear regulators L829 items. They are required to use the existing regulators in the switchgear.

The lighting vault controls modification, L890 item, involves proprietary ADB software.

23-Jul-18 A04 24-Jul-18

R0053 3-Jul-18

If there are no modifications or additions to the switchgear CCR's the issue would then be the L890 ALCMS. Any changes or upgrades to the system would have to be performed by ADB and therefore proprietary. We would request that the

ALCMS scope of work have a predetermined cost and that cost be made part of the bid tabulation as an allowance item allowing the successful contractor the ability to purchase the balance of the electrical package from the manufacturer of their choice without the concern of being able to procure the proprietary software and or services from ADB. This will effectively create a fair and open bidding environment for all qualified manufacturers and provide the Scott AFB the ability to select the most economical proposal that meets their requirements.

At this time, the Government does not intend to create a separate line item with a predetermined cost for the ALCMS scope of work. Airfield lighting fixtures are not limited to one manufacturer. The current control system is compatible with products from other manufacturers. This RFP is a best value trade-off so Offerors are welcome to propose the best solution in conformance with the SOW and Design

Documents.

23-Jul-18 A04 24-Jul-18

R0054 20-Jul-18 Will the 24 way 2” under TXWY F require reinforcement? It appears to be in an unused portion of the Taxiway.

The TXWY F will require reinforcement per full strength pavement requirements.

23-Jul-18 A04 24-Jul-18

R0055 20-Jul-18

During what phases will the Lighted X’s need to be up and running? Fueling for these will be required, is that the responsibility of the Contractor or will the

375 fill these generators?

During runway shut down Phase 1 work coordinated with base airfield ops. Contractor shall provide for all power and fueling requirements.

23-Jul-18 A04 24-Jul-18

R0056 20-Jul-18

From existing MH01 to the vault and there is a 10 way 4”, is it acceptable to keep existing MH01 in place and use it from a tie-in point for the new 10 way 4”? This method will allow for all existing circuits to remain in place and a cut over to take place in existing MH01 when needed.

Yes. 23-Jul-18 A04 24-Jul-18

R0057 20-Jul-18

There is a storm structure currently in the threshold bar on the north end, will this structure be built into the new threshold bar?

Yes 23-Jul-18 A04 24-Jul-18

R0058 20-Jul-18

Currently there is no call out or drawings for demolition of cable from the North

MALSR shelter to the vault, will this need to be included?

Contractor shall demo complete existing MALSR shelter, equipment, pads and grade/seed to existing site conditions. Existing MALSR cabling/conduit from AFLV shall be abandoned in place. Contractor shall return transformer to the government along with generator and ATS.

23-Jul-18 A04 24-Jul-18

R0059 20-Jul-18 Are the duct banks feeding the ALSF structures in the north overrun reinforced?

See R0011 Response. 23-Jul-18 A04 24-Jul-18

R0060 20-Jul-18 Will each ALSF circuit need a dedicated #6 green (per drawing EL603 1 -#6 GRD is needed for 8 - #6 5KV)?

Yes. Each airfield lighting circuit requires a dedicated 2" conduit and ground.

23-Jul-18 A04 24-Jul-18

R0061 20-Jul-18

Drawings GS101 through GS109 show silt fence listed in the symbol legend, however, no silt fence is shown on the drawings. Is the contractor to determine the silt fence required and include in price, so are we only to include what is shown?

It is not envisioned that a EPA permit will be required for the project since total excavation should be less than 1 acre in square footage. Silt fence would only be required for excavated material stockpiling on "downstream" side of site.

24-Jul-18 A04 24-Jul-18

R0062 20-Jul-18

Legend on CP-101 through CP-103 lists 4” Thick HMA. Detail on CP301 shows two lifts of 4” HMA. Does the HMA on the north end of the 14R overrun consist of 1 or 2 lifts of 4” of HMA?

North Overrun requires two lifts of 4"

HMA.

23-Jul-18 A04 24-Jul-18