21B5502_A0001_Atch(1)_Pre-Bid_Inquiries.pdf

SOLICITATION NO. N4008421B5502

RENOVATE NORTH POND PHASE 1 AT U.S. MARINE CORPS AIR STATION IWAKUNI, JAPAN (ID#3711119)

GOVERNMENT PRE‐BID INQUIRY FORM Amendment 0001 Attachment (1)

Page Section Para.

1 13‐Jul‐21 GC102 We would like to know the height limit of each work area in the equipment work area of drawing number GC102. (1) Areas with a 7m limit, (2) Areas where night work is performed beyond the 7m limit, and (3) Areas where night work is performed regardless of the height limit.

Height limitations are identified by the 7:1 transitional surface contour for areas within.

Contractor will be responsible to submit the airfield waiver that identifies equipment height for airfield approval.

2 13‐Jul‐21 GC102

RUNWAY

OBSTRUCTION

NOTES: 5

It says "On‐Shore Soils Disposal Sites are Limited to 7m in Height", but where is 7m based on? Does it refer to the height of fill in the soil disposal or the height of construction equipment in the disposal site?

Both Equipment and fill material must be below the 7meter height requirment. This is based on the 7:1 transitional surface contour for areas within.

3 13‐Jul‐21 General Since the water level required for construction is different for dredging work and slope protection work, is it acceptable to install a temporary equipment at the existing outlet in the hollow to adjust the water level?

(Location of Drawing No. CN101, E1 EXIST. OUTLET

FOR BASIN)

We would like to install temporary large sandbags in the concrete area of the existing outlet for the basin, and adjust the water level in the basin with several submersible pumps.

Any temporary measure will require Government Approval after award of the project.

4 13‐Jul‐21 17 01 14 00 1.3.4.1 Is it possible to carry out dredging work during the daytime if the height of the equipment is less than 7m, although it is described as night work in the specification?

The airfield waiver will determine what features of work can be accomplished during day time and night time hours.

5 13‐Jul‐21 General What is the average water surface height in the dredging area? For the pump dredging barge, the 70cm draft (Vertical distance from the bottom of the hull to the water surface) needs to be secured, is it possible to adjust the water surface level?

It is not possible to adjust the water level, the water surface level is dependent on the Koimazu Pump operation, on at ‐0.5 m Tokyo Piel (TP) off at ‐0.7 m (TP)

6 13‐Jul‐21 General If using a pump dredging barge for dredging work, is it acceptable to install anchor blocks for moving the barge?

A floating crane exavator dredge will be used to perform all dredging work under contract per the specifications.

7 13‐Jul‐21 General If using a dewatering processor (filter press) for dredged sediment, is it acceptable to discharge wastewater generated by dewatering ptocess into the North Pond?

The proposed method is not allowed by the Government.

Amend No.

Question No.

Date Received REFERENCE QUESTION GOVERNMENT RESPONSE

GOVERNMENT PRE‐BID INQUIRY FORM Amendment 0001 Attachment (1)

Page Section Para.

Amend No.

Question No.

Date Received REFERENCE QUESTION GOVERNMENT RESPONSE

8 13‐Jul‐21 General If a dewatering processor (filter press) is used in the equipment storage area, the pipes for mud and drainage need to cross the road.

Is it acceptable as long as vehcle access is secured by temporary materials?

Yes this would be allowed on Skyraider RD and Humvee Road as long as the temportary materials include structural backfill and pavement. This would also need to be maintained for the duration of the project.

9 13‐Jul‐21 General In the case of using a pump dredging barge, based on past experience, it will take about 7 months to complete the project even if it is calculated at a maximum of 1,000m3/month. Is it possible to extend the construction period?

A floating crane exavator dredge will be used to perform all dredging work under contract per the specifications.

10 13‐Jul‐21 General It is assumed that the existing paved road facing to MIDDLE PIER will be used by Contractor while assembly and disasssembly of the pump dredge barge.

Is it acceptable?

This area can be used for the project. 0001

11 13‐Jul‐21 General For the dredged soil quantity confirmation and acceptance method, will the quantity of data calculated before and after dredging used? or will the quantity of soil disposal used?

Dredged soil quantity confirmation shall be based on the haul out volume of the sediment based on wet volume or weight. Disposal of cleared sediment shall be based on haul out volume of the sediment as loose dry volume or weight.

12 13‐Jul‐21 266 35 20 23 1.7

BASIS

FOR BIDS

It states "Base bids on the quantity of dredging indicated."

Please provide the quantity of dredging for bidding.

The bidder shall proivde base bid quantity for the dredging work, because the contractor is also responsible not to exceed the allowable overdreged depth quantity. Over dredge sediment quantity shall not be compensated due to the contrator's fault exceeding the allowable overdredge depth.

13 13‐Jul‐21 150 01 45 00.00 20 1.14

COMPLE

TION

INSPECTI

ONS

Please provide the information for what measurement method will be used to inspect the completed dredging area.

Method of depth measurements for the completed dredging area shall be submitted by the contractor for approval by the Government. Please use any industry standard survey method for water depth determination.

GOVERNMENT PRE‐BID INQUIRY FORM Amendment 0001 Attachment (1)

Page Section Para.

Amend No.

Question No.

Date Received REFERENCE QUESTION GOVERNMENT RESPONSE

14 13‐Jul‐21 267 01 45 00.00 20 3.2.3.1 Overdept h Dredging

Please clarify the contents of the description.

Does it mean that overdigging in dredging from T.P‐ 1.4m is only allowed ‐0.15m?

What is meant by "the maximum amount of allowable unpaid overdepth dredging"?

The allowance for overdreging shall not be more than ‐0.15M based on the original design depth. Any dredge sediment beyond the allowed overdreging depth shall be fault by the contractor and shall not be compensatable.

15 13‐Jul‐21 CN102 Are the two "Elevated Utilities Crossing" in the west channel dredging area electrical cables or water pipes?

Please provide pipe information (what utility, living or not in use) to consider the protection method.

These are buried electrical that are live to the best of our knowledge.

16 13‐Jul‐21 CN103 F1 There are two south end slope protection repair areas, one is between CP12 and CP14, and the other is between CP17 and CP20.

Is the Contractor's understanding correct?

Yes, this is correct. 0001

17 13‐Jul‐21 35 31 19.20 Para 2.1 and 31 05 19 Para 2.1.1

The product names of the new ACB blocks and geotextiles are not listed, can the contractor select materials if they meet the performance of the specifications?

If there are any recommended products, please disclose.

Winning bidder shall submit proposed material, for review and approval of the Government, that will meet the contract specifications requirements that shall meet the design intent of the use of the poropsed material.

18 13‐Jul‐21 GC102

RUNWAY

OBSTRUCTION

NOTES: 5

For both the south end pond slope protection repair area and the central bridge pier access road repair area, if the equipment used for construction is less than 7m above the road height, can the work be conducted during the daytime?

Height limitations are identified by the 7:1 transitional surface contour for areas within.

Contractor will be responsible to submit the airfield waiver that identifies equipment height for airfield approval.

19 13‐Jul‐21 CN103 and

CN104

Is it necessary to dry out the slope protection at the toe of the slope protection in both the south end pond slope protection repair area and the central pier access road repair area?

When installing the material in the dry condition, is it acceptable to place sheet piles at a distance of about 11m from the top of the cut slope?

Any temporary measure will require Government Approval after award of the project.

GOVERNMENT PRE‐BID INQUIRY FORM Amendment 0001 Attachment (1)

Page Section Para.

Amend No.

Question No.

Date Received REFERENCE QUESTION GOVERNMENT RESPONSE

20 13‐Jul‐21 CN104 A1 The bedding material is specified S‐20 single size crushed stone in the drawing note, but the bedding material illustration on the toe of the slope protection and the bedding material under the ACB blocks are different, is it same bedding material?

No, they are not the same, use crushed stone cover size 200mm ‐ 150mm.

21 13‐Jul‐21 CN104 A1 Is the laying height of the ACB blocks from 0.6m above the slope protection to the toe of the slope protection?

Yes. 0001

22 13‐Jul‐21 CN104 A1 Is the compaction soil at the top of the slope "Decomposed granite soil/masa‐tsuchi"?

Yes. 0001

23 13‐Jul‐21 150 CN104 A1 1.14

COMPLE

TION

INSPECTI

ONS

For both the south end pond slope protection repair area and the central pier access road slope protection area, is it necessary for the slope protection tip to be dry during the prefinal/final inspection after construction is completed?

Yes, Government requires areas to be dry during inspection.