November 16, 2016 Page 3
20161116 Addendum No 1.docx 3066.07
Clarification on Work Performed
1. During the pre-bid meeting, a potential bidder suggested that repairs to penetrations
(shown on Detail 3 on Sheet 7 of the Construction Drawings) in the Draintube™ model
600CW LFG4 D25 Surface Collection Layer be extrusion welded. This was considered,
however; based on discussions with the material manufacturer after the pre-bid
meeting, it was recommended that butyl tape be used instead of welding. This method
has since been discussed with and approved by the City of Nashua.
To clarify, Draintube™ that is cut and removed in order to fit the Draintube™ over the
existing wellheads shall be saved and re-installed/secured with butyl tape. The tape
will be used to rejoin the material and create a seal around the existing risers to the
extent practical. Breaks in the 1-inch diameter Draintube™ pipes shall be reconnected
using snap couplers provided by the Draintube™ manufacturer.
Very truly yours,
SANBORN, HEAD & ASSOCIATES, INC.
R pba
Project Manager
RLC/ESS:rlc
Encl. Table A: LFG Well Depth Summary
cc: Kerry Converse, Jeff Lafleur, Dan Kooken, Kathleen Carragan - City of Nashua
P:\3000s\3066.07\ Source Files\2016 LFG Const\Bidding\Addenda\1\20161116 Addendum No 1.docx
SANBORN HEAD
