6366C - Construction of Pecan Creek Water Plant Hydraulic Improvements, Addendum 1 ClarificationsHazen and Sawyer • 8350 North Central Expressway, Suite 775 • Dallas, TX 75206 • 214.382.5750
Addendum No. 1
Jobno60702-000March 1, 2017
Re: Addendum No. 1 for RFP #6366 Construction of Pecan Creek Water Plant Hydraulic
Improvements for the City of Denton Project
The following are clarifications to the Request for Proposal (RFP) #6366 based on the questions raised
during the non-mandatory pre-bid meeting and site visit held on February 22, 2017 at 1:30 pm.
Question: Does the contract require dewatering and cleaning of the RSPS2 wet well?
Response: Yes, the Contractor is responsible for completely draining the RSPS2 wet well and
forcemain to complete the Work. The wastewater can be pumped to either Grit Trap Box No.
1 or No. 2 so that the bypass pumps pump it to the treatment plant. The Contractor is
responsible for cleaning the wet well suficiently to perform the Work required as described in
the documents.
Question: Could the junction box upstream of Grit Box No. 2 (Junction Box No. 1) be utilized
for bypass pumping?
Response: The City is flexible on the installation location of bypass pumps to complete the
Work. Grit Trap Box No. 1 (west of RSPS2) must be used at a minimum to keep solids from
settling at the interceptor low point. If an additional bypass pump installation location is
required either Grit Trap Box No. 2 or the Junction Box No. 1 may be utilized. The invert
elevation of Junction Box No. 1 varies between 537.60 and 538.60. The water surface
elevation shall not exceed 547.00 during operation. The record drawings for Junction Box
No.1 are included as part of this clarification for information purposes only.
Question: Could the Contractor install a permanent tap on the existing forcemain with a flange
above grade to connect the bypass pump forcemain?
Response: The Engineer and Owner will not dictate means and methods for bypass pumping
logistics. However, the installation of a permanent tap on the forcemain to facilitate bypass
pumping would be acceptable. See addendum changes below for further requirements on pipe
taps. The record drawing information available for this forcemain is attached: “Modified Yard
Piping – Area 1” Sheet C-11 from the PCWRP Expansion, September 2001. Profile
information for this forcemain is not available at this time.
Question: Is the existing access hatch the only access location for retrieving and installing
equipment?
Response: The existing access hatch and door are the only locations for equipment and material
egress.
Clarification: The 15 days of bypass pump operations included in the lump sum bid item
number 5 assumes the Contractor working 24/7 to complete the Work.
March 1, 2017
RFP 6366 Addendum #1 Page 2 of 2
The following are changes to the Request for Proposal (RFP) #6366:
Section 01043: Table MAINTENANCE OF UTILITY OPERATION DURING
CONSTRUCTION SCHEDULE;ADD the following paragraph to the end of the
“CONSTRAINTS AND REMARKS” column:
“Contractor shall utilize Grit Trap Box No. 1 for bypass pump installation at a minimum. If
additional structures are required then Grit Trap Box No. 1 and Junction Box No.1 may be
utilized. The maximum WSEL for these structures is the same as Grit Trap Box No. 1 listed
above.”
Section 15000:ADD the following paragraph after Paragraph 2.02:
“2.03 TAPPING SLEEVES AND TAPPING SADDLES
A. Tapping sleeves shall be similar to Mueller Outlet Seal, American Uniseal or Kennedy
SquareSeal. All sleevesshall haveaminimumworkingpressureof150psi. All sleeves
larger than twelve (12) inches shall be ductile iron. All taps shall be machine drilled;
no burned taps will be allowed.
B. Tappingsaddlesmaybeusedonmainssixteen(16)inchesandlargerwheretherequired
tap size does not exceed one-half the size of the main (i.e. 8-inch tapping saddle for use
on a 16-inch main). Tapping saddles shall be manufactured of ductile iron providing a
factorofsafetyofatleast2.5ataworkingpressureof250psi. Saddlesshallbeequipped
with a standard AWWA C-110-77 flange connection on the branch. Sealing gaskets
shall be "O" ring type, high quality molded rubber having an approximate seventy
durometer hardness, placed into a groove on the curved surface of the tapping saddles.
Straps shall be of alloy steel. The tapping saddle shall be the American tapping saddle,
U.S. Pipe tapping saddle, or equal. All taps shall be machine cut, no burned taps will
be allowed.”
There are no other changes at this time.
Please acknowledge Addendum No. 1 on the Attachment F in the Main RFP document when submitting
your proposal.
Thank you,
Brandt Miller, PE
Project Manager