6503- Construction of Water & Sanitary Sewer Improvements Phase 2 For the Denton Energy Center - ADDENDUM 1
Purchasing Department
901-B Texas St.
Denton, TX 76209
(940) 349-7100
www.dentonpurchasing.com
ADDENDUM #1
IFB # 6503
CONSTRUCTION OF WATER AND SANITARY SEWER
IMPROVEMENTS – PHASE 2 FOR THE DENTON ENERGY
CENTER
Issue Date: September 7, 2017
Response due Date and Time (Central Time):
Tuesday, September 12, 2017, 11:00 a.m.
IFB #6503
ADDENDUM #1
Addendum #1 to be returned with bid.
Following this document are changes and clarifications to the bid
specifications.
NO OTHER CHANGES AT THIS TIME.
Please acknowledge addendum on Attachment F of the
main IFB document when submitting a response.
Addendum No. 1 – Page 1 of 3
ADDENDUM NUMBER 1 TO
PLANS, SPECIFICATIONS AND CONTRACT DOCUMENTS FOR
CITY OF DENTON, TEXAS
INVITATION FOR BIDS
IFB 6503
CONSTRUCTION OF WATER AND SANITARY SEWER IMPROVEMENTS – PHASE 2
FOR THE DENTON ENERGY CENTER
Issued September 6, 2017
TO: PROSPECTIVE BIDDERS AND PLAN HOLDERS
The Plans and Specifications for IFB 6503 CONSTRUCTION OF WATER AND SANITARY
SEWER IMPROVEMENTS – PHASE 2 FOR THE DENTON ENERGY CENTER shall be modified
as follows:
ITEM 1 EXHIBIT 1 – IFB 6503 PRICING SHEET FOR WATER & SANITARY SEWER –
PHASE 2 DME DENTON ENERGY CENTER
1) Replace with the attached revised Exhibit 1
ITEM 2 EXHIBIT 3 – TECHNICAL SPECIFICATIONS
1) V. Special Contract Requirements and Price Item Definitions, B. Price Items
- Item 501.7 12”,16” and 20” R.J.D.I. Water Carrier Pipe and Item 501.7 10” R.J.D.I.
Sanitary Sewer Carrier Pipe, revised the section on “Wrap” to read as follows:
“Wrap: The ductile iron pressure pipe and fittings shall be wrapped in two layers of
polyethylene encasement butting directly up to the installed casing spacers. Each layer of
wrap shall be duct taped to the casing spacer to seal the encasement. The inner encasement
shall be 8 mil LLD polyethylene and the outer encasement shall be 4 mil cross link
polyethylene.”
- Add the following price item:
“ITEM WO4 - FLUSH AND DISINFECT EXISTING WATER SERVICE LINE
General: This item shall provide for all labor, equipment, and materials in order to properly
flush and disinfect the existing water service line for the Denton Energy Center Buildings.
The flushing and disinfection will be from the connection point to the water main at Sta
25+12.96 to and through the existing water meter and HDPE water service piping up to the
main building and the guard house building. Disinfection testing shall be included within
this work. This item shall include two complete flush, disinfect, and test operations. If
additional flush, disinfect, and test operations are needed in order to pass bacterial testing,
these additional operations will be by change order.
NCTCOG Reference: Item 506.7
Addendum No. 1 – Page 2 of 3
Payment: Payment shall be at the contract lump sum price for Flush and Disinfect Existing
Water Service Line.
2) City Amendment to NCTCOG Specifications,
- Item 503.2 Tunnel/Casing Pipe Spacers, add the following
“Casing Spacer lining shall be ribbed EPDM”
- Item 503.3 Boring and Tunneling, for water line bores revise as follows
Vertical tolerance shall be +/- 1.0% of indicated grade for water line bores. Horizontal
tolerance for water line bores shall remain as indicated in the specifications.
ITEM 3 EXHIBIT 4 – DRAWINGS
1) Sheet C1.06, revise the call at Sta 25+12.96 WL 2 to read as follows:
“INSTALL:
12”x4” MJ TEE
4” MJ GATE VALVE
4” AWWA C-900 DR-14 PVC, LENGTH AS REQUIRED
1- CONNECTION TO EXISTING 4” DR 11 HDPE FROM METER BOX, & FITTINGS AS
REQUIRED
N 7128046.241
E 2362894.460”
ITEM 4 CLARIFICATIONS
1) Work within the airport property for sanitary sewer improvements will be allowed during
daylight hours Monday through Saturday.
2) Scheduled City inspection that requires overtime will not be charged to the contractor for the
project.
3) The charged to the contractor for the City to provide and install the 16 inch tapping sleeve and
valve is $13,554.00.
4) Suitable soil spoils from the water and sewer line improvements can be transported to the
existing stockpile just north of the Denton Energy Center as directed by the Engineer.
Unsuitable soils such as large rocks, rock fragments, etc can also be transported to the existing
stockpile to a separate location as directed by the Engineer. Brush from clearing and grubbing
can be chipped into mulch and spread onto the work area after hydro seeding is performed or
brush shall be removed from the site with all other clearing and grubbing materials. The
consistency of the mulch produced must be suitable for use as a mulch as required by the
Engineer. The manner and depth of mulch spread onto the work area must be approved by the
Engineer.
5) Restrained joint ductile iron pipe shall have the same exterior coating and interior lining as
specified in the City Amendment to the NCTCOG Specification Item 501.7 Ductile Iron
Pressure Pipe.
6) No interior liner is required for the sanitary sewer manholes.
Addendum No. 1 – Page 3 of 3
7) Cost for initial welding inspection of casing pipe will be by the City at no expense to the
contractor. Welding inspections by the City welding inspection service after corrective welding
is made will be at the expense of the contractor and no expense to the City.
8) The Contractor awarded the project shall be required to attend a 1 hour safety meeting with the
Denton Energy Center Contractor, Burns & McDonnell.
9) The contractor shall protect the tree canopy from damage within the Jim Christal road right of
way during the transport of equipment and materials to and from the project. The contractor
shall take necessary preventive action in advance and inform the Engineer of the preventive
actions to be taken prior to construction.
10) There is no federal Buy America requirement for the project. Also refer to the City Material
Submittal Checklist – Oct 2016 which shows acceptable manufacturers/products.
11) A 20” diameter steel casing is an acceptable size alternative to the 18” steel casing by open
trench for the sanitary sewer line improvements.
All other items and provisions of the contract documents not modified herein shall remain the same.
THIS ADDENDUM IS MADE PART OF THE PLANS, SPECIFICATIONS AND CONTRACT
DOCUMENTS AND SHALL BE ACKNOWLEDGED ON THE PROPOSAL.
By: Robin Harris, P.E. (TX No. 110694)
TEAGUE NALL & PERKINS, INC.
Attachments:
END ADDENDUM NUMBER 1