February 6, 2019 Page 2
20190206 Addendum Questions File No. 3066.09
10.
11.
12.
The pre-existing conditions shown on Drawing 1 have not changed substantially since
2010.
Please confirm the boundary line for bid item number 24 topsoil and seeding.
Contractor takeoff is closer to 7 acres.
See attached Topsoil and Seeding Figure and revised Schedule of Values.
Note 1 on detail 2 on sheet 20 of 24 says to line pond 6 and the forebay with 12-
inches of screened till. Please confirm the limits of detention pond 6 and the
forebay to determine the limits of the screened till.
The limit of the forebay and Pond 6 is the elevation 210-foot contour. Pond 6 and its
forebay is estimated to have a surface area of about 28,700 square feet.
Note 1 on detail 2 on sheet 20 of 24 says to remove the sediment within pond 6.
How much sediment is anticipated to be removed from pond 6?
The depth of built up sediment within Pond 6 is unknown. For this bid, the bidders
shall assume removing sediment in the pond that is no more than 12 inches thick.
Please confirm that the secondary sand location on sheet 4 of 24 is accurate.
The secondary sand hatching shown on sheet 4 conflicts with the liner system
details on sheet 11 of 24. Is the 1’ sand layer across the entire cell?
Secondary Sand shall only be placed within areas of the liner system that are sloped at
2 and 4 percent as shown by the limits on Sheet 4 of the Construction Drawings. Areas
of the liner system sloped at 10 percent and 2(H):1(V) do not require Secondary Sand.
Please provide the as-built plans for the existing litter control fence so that
contractor can appropriately bid the removal and re-installation.
See the attached Structure As-built Plan, dated 3/31/2009 for the location of the litter
fence, and the description of the litter fence installation in the Phase II landfill QA/QC
report. Field measurements confirm that the posts are spaced 50 feet on center.
For bid Item #16, shall the contractor anticipate coming into contact with
leachate or will the leachate within the cell be pumped down to complete the
work?
It is not anticipated that the contractor will encounter leachate in making connections
to the Phase II leachate collection system. However, the contractor must take
appropriate worker safety measures while performing the work in case leachate
and/or landfill gas is encountered.
SANBORN il HEAD
