Sacramento RFI and Answers.pdf

SACRAMENTO DWSC DREDGING PROECT

YOLO & SACRAMENTO, CALIFORNIA

AS OF: 26 May 2021

QUESTIONS & RESPONSES

SOLICITATION NUMBER W912P721B0005 2 June 2021

The intent of this section is to provide questions & comments received from interested parties on the above solicitation, and our responses to those questions and comments. It is possible that the information below does not reflect 100% of the questions and responses. The questions and comments do not necessarily represent questions received from any particular contractor.

Questions and responses are provided for information only and are not made part of the solicitation. Only a formal amendment (SF30) to the solicitation changes the solicitation.

Changes to any previous responses in this document will be struck-through and new, updated responses will be provided as appropriate

RFI # Spec Section RFI (Question) Responses

1 35 20 23

Section 35 20 23 Paragraph 3.5.4 stipulates that a minimum of 24” of freeboard must be maintained along all exterior dikes.

What is the crown height of the existing exterior dikes that the 24 inches of freeboard is relative to?

All the disposal sites shown on the pricing schedule have sufficient capacity for the estimated quantities in the bid. Please see attached pdf maps for additional details on placement sites.

2 What is the authorized fill elevation of the Dredged Material Placement Sites?

Per the MOU with the waterboard, 2 feet of freeboard is needed at all sites.

3 What is the existing elevation of the Dredged Material Placement Sites?

See RFI #1

4 Please provide coordinates and any available documentation for all Dredged Material Placement Sites provided for this Contract.

Please use the maps provided. All the placement sites have sufficient capacity for the quantities in the bid.

5 What is the available capacity of each of the placement sites for this Contract?

See RFI #1

6 35 20 23

Section 35 20 23 Paragraph 3.5.2 states, “Modifications to the placement site's levees including raising or constructing new dikes to accommodate the dredged material will be the responsibility of the respective Port District.” Is it possible that modifications needed to the external dikes, that are the responsibility of the Port, could delay the start of dredging?

The placement sites are 100% the responsibility of the Port the Corps team coordinates with the Port to ensure the sites are functional and all modifications are complete prior to dredging.

7 Biological Opinion

Table 1 f rom the Biological Opinion provides ponding areas and volumes for the Dredged Material Placement Sites a Is the Contractor to assume that this is the usable fill area that will be available for material placement?

Yes

AS OF: 26 May 2021 b Are there any conflicting operations within any of the placement sites that would reduce the fill area and capacity available to the Contractor?

No c The ponding areas provided don’t appear to match the areas shown in the plans. Can the USACE please verify the fill area of each of the material placement sites?

The map in the plans shows the overall area of the placement site.

8 Biological Opinion

Table 1 f rom the provided Biological Opinion indicates “special requirements” for the placement areas which include ongoing mining operations, trucks hauling throughout the site, and heavily wooded areas a Will portions of the placement areas need to be avoided due to these conditions?

Currently there is no known portions of the placement areas that need to be avoided.

b If so, can the USACE please provide coordinates of any avoidance areas?

See 8a

9 35 20 23 Table 1 f rom the Specifications provides a “landing point station” for each disposal area. Paragraph 3.4.1.2 from Section 35 20 23 states, “The stationing of the landing point is determined by a perpendicular projection of the channel's centerline stationing onto this point.”

a Is the stationing provided intended to be the point where the discharge pipe makes landfall to the disposal area?

Yes, however, the landing points are up to the dredging contractor and f ield conditions.

b A perpendicular projection from Station 795+00 does not appear to intersect the Grand Island placement area. Will the USACE please add all landing points to the plan view drawings?

The landing points are up to the dredging contractor and field conditions.

Please see attached pdf maps for additional details on placement sites.

c Landing point 518+00 is provided in Table 1 of the Biological Opinion but omitted from Table 1 of the Specifications. Is Station 518+00 available as a landing point for the Rio Vista placement area?

Yes, station 518+00 is available as a landing point. The landing points are up to the dredging contractor and field conditions.

Please see attached pdf maps for additional details on placement sites.

d Landing point 768+00 is provided in Table 1 of the Biological Opinion but omitted from Table 1 of the Specifications. Is Station 768+00 available as a landing point for the Grand Island placement area?

Yes, station 768+00 is available as a landing point. The landing points are up to the dredging contractor and field conditions.

Please see attached pdf maps for additional details on placement sites.

10 Plan Plan sheets C-07 and C-08 show the discharge pipeline for DMPS S-31 located at Stations 1511+00 and 1564+00 respectively.

a Are these the only locations where the discharge pipeline is permitted to enter S-31?

There are additional locations away from the reaches shown on the plan.

The landing points are up to the dredging contractor and field conditions.

Please see attached pdf maps for additional details on placement sites.

b These locations do not correspond to the “landing point” for S-31 provided in Table 1 of the Specifications. Will the USACE please clarify where the discharge pipe is permitted to enter the disposal area?

Landing point varies since this site is long and narrow. The landing points are up to the dredging contractor and field conditions. Please see attached pdf maps for additional details on placement sites.

AS OF: 26 May 2021

QUESTIONS & RESPONSES

SOLICITATION NUMBER W912P721B0005 2 June 2021

11 Plans

Plan sheet C-07 shows a “proposed gravity drainage path for decant water” for DMPS S-31. However, Table 1 from the Biological Opinion indicates “pump” as the method of return water for the S-31 placement site. Will the USACE please clarify the method of dewatering required for S- 31?

The method of dewatering for the site is “gravity”. The material pumped into the site will dewater itself by percolation.

12 35 20 23

3.4.1.2 of Section 35 20 23 discusses the designation “E” for the disposal sites and the mounding and elevation allowance but is unclear regarding the physical characteristic of the disposal area that it describes. Please clarify the purpose of the designation “E” and the mounding and elevation allowances as it relates to the disposal sites.

Contractor can mound above the nominal 18 ft elevation (mean sea level) on all the placement sites.

13 35 20 23

Paragraph 3.4.2 of Section 35 20 23 states that the Contractor shall remove and replace in-kind chain link fence that separates the Rio Vista DMPS from the city park facility. Will the USACE please provide the linear footage of fence to be replaced and show the location on the plans

There is no drawing for the fence location.

14 Plans Plans sheets C-07 and C-08 show an orange dashed line running through the eastern side of DMPS S-31. What is this dashed line indicative of?

Orange line is access road. Please see attached pdf maps for additional details on placement sites.

Will the USACE please provide the location and details of any existing dewatering structures in the Dredge Material Placement Sites?

Please see attached pdf maps for additional details on placement sites.

16 35 20 23/FE

Section 01 32 23 Paragraph 1.7.3 states, “The Government will perform volume computations based on the third-party contractor's (furnished by the Contractor) final Before-Dredge (BD) and After- Dredge (AD) surveys under this contract.” However, FAR Clause 52.236-16 Part (b) states, “The Contractor shall conduct the original and final surveys and surveys for any periods for which progress payments are requested.” May payment surveys be performed by the Contractor or must a third-party survey company be utilized?

The payment surveys must be performed by a third party survey company.

17 Please give us the breakdown of any cells at each of the disposal sites.

Please see attached pdf maps for additional details on placement sites.

18 Please provide any pre and post surveys of the Government furnished placement sites.

Pre and post surveys are not available at this time

19 Please identify any private land or contractors furnished placement All disposal sites shown on the pricing schedule are Government

AS OF: 26 May 2021 site locations used in the past. Furnished 20 Please provide any pre and post surveys for contractors furnished placement site locations used in the past.

See #18

Will the USACE please consider allowing the Contractor to place dredged material at the DMPS of the Contractor’s choosing, provided that the site is one of the four provided in the Plans?

See Section 35 20 23, Paragraph 3.4.6 (Page 11) and Paragraph 3.4.1.1.

Reaches and disposal sites are specified in the contract pricing schedule.

May the Contractor pump into one or more DMPS concurrently or is the Contractor required to exhaust one reach and/or DMPS before moving to the next?

See Section 35 20 23, Paragraph 3.4.6 (Page 11). Reaches and disposal sites are specified in the contract pricing schedule.

23 Does a reach have to be completed and accepted before dredging can begin in another reach?

Government plans to administer in accordance with the contract requirements

Where are the Landing points for reach 8 & 9?

• The table on page 321 (PDF counter) in the Attachments to Section 01 57 19 to the Technical Specifications indicate the station landing as “Variable” and “Landing Point Will Move Along Site” for S-31 class I.

• Attachment 8-c included at the end of the Technical Specifications indicate the Landing Site area between approximate mile marker 33.5 through 40.5 for S-31.

• The provided plans do not indicate a landing point for reach 8 or 9.

There are numerous cells along the S-31 site. The contractor may utilize any of the cells provided that there is sufficient capacity and the berms are in good shape

25 Can water be decanted by gravity for reach 7, 8 & 9? Yes. Water can be decanted by gravity for cells on S-31

AS OF: 26 May 2021