PWD CIP NO. 21-796 Page 1 of 6 6/19/2015 June 19, 2015 ADDENDUM NO. 3 TO CONTRACT DRAWINGS AND SPECIFICATIONS FOR EAST END WASTEWATER TREATMENT FACILITY AERATION UPGRADE PWD CIP NO. 21-796 PORTLAND WATER DISTRICT, PORTLAND, ME A. GENERAL 1. The attention of all prospective Bidders submitting proposals for the above- referenced project is called to the following Addendum to the Contract Documents. The items set forth therein, whether of omission, addition, substitution, or clarification, are all included in the proposed work. 2. Inclusion of this Addendum must be acknowledged by inserting its number on the appropriate page(s) of the Bid Forms. Failure to acknowledge any and all Addenda in the above-specified Bid may be cause for rejection by the District on the grounds that it is non-responsive. B. CHANGES TO SPECIFICATIONS 1. Section 00100 – INSTRUCTION TO BIDDERS a. In Item 6, DELETE the following text: “700 calendar days” and REPLACE with the following: “730 calendar days” a. In Item 22, DELETE the following text in the second paragraph: “Error! Reference source not found” and REPLACE with the following: “within ten (10) working days” 2. Section 00300 – BID FORM a. DELETE the following text in Article 3.01.D: “; and the Site-related reports and drawings identified in the Bidding
25
Embed
June 19, 2015 ADDENDUM NO. 3 TO CONTRACT … · piping within the blower room.” b. ... basis of design are alphasorb high impact acoustic ... 5. drawing m05 b.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
PWD CIP NO. 21-796 Page 1 of 6 6/19/2015
June 19, 2015
ADDENDUM NO. 3
TO
CONTRACT DRAWINGS AND SPECIFICATIONS
FOR
EAST END WASTEWATER TREATMENT FACILITY AERATION UPGRADE
PWD CIP NO. 21-796
PORTLAND WATER DISTRICT, PORTLAND, ME
A. GENERAL
1. The attention of all prospective Bidders submitting proposals for the above-
referenced project is called to the following Addendum to the Contract Documents.
The items set forth therein, whether of omission, addition, substitution, or
clarification, are all included in the proposed work.
2. Inclusion of this Addendum must be acknowledged by inserting its number on the
appropriate page(s) of the Bid Forms. Failure to acknowledge any and all Addenda
in the above-specified Bid may be cause for rejection by the District on the grounds
that it is non-responsive.
B. CHANGES TO SPECIFICATIONS
1. Section 00100 – INSTRUCTION TO BIDDERS
a. In Item 6, DELETE the following text:
“700 calendar days”
and REPLACE with the following:
“730 calendar days”
a. In Item 22, DELETE the following text in the second paragraph:
“Error! Reference source not found”
and REPLACE with the following:
“within ten (10) working days”
2. Section 00300 – BID FORM
a. DELETE the following text in Article 3.01.D:
“; and the Site-related reports and drawings identified in the Bidding
THE PORTLAND WATER DISTRICT
PWD CIP NO. 21-796 ADDENDUM NO. 3
PWD CIP NO. 21-796 Page 2 of 6 6/19/2015
Documents”
b. Refer to the revised Specification Section 00300 in Attachment No. 2.
3. Section 08710 – FINISH HARDWARE
a. DELETE Article 1.02.A
b. RENUMBER 1.02.B to 1.02.A
4. Section 11132 – SUBMERSIBLE PROPELLER PUMPS
c. REPLACE Article 2.04.A
“A. Each pump shall be provided with a lifting davit floor pedestal mounted at each
pump location. Davit to be nominal 1200# capacity with minimum 48” horizontal reach
and 96” vertical lift. Davit crane frame material to be painted steel and winch to be worm
gear type. Each davit crane shall be provided with 36 feet of Type 316 stainless steel lifting
cable with one end attached to the pump lifting bail. Davit to include stainless pedestal
base for field anchoring in location as directed by engineer. One drill drive kit shall be
provided with a 1-1/8” hex socket drive. Davit hoist to be Thern 5PA10-M2, or equal.”
5. Section 15100 – VALVE OPERATORS AND ELECTRIC VALVE
ACTUATORS
a. DELETE the following text from Article 2.03.A.1 and Article 2.03.A.2:
“Series 2000”
and REPLACE with the following:
“Series TEC2000”
b. DELETE Article 2.03.O
6. Section 15390 – SCHEDULES
a. DELETE Piping System Schedule Note (2) and REPLACE with:
“PROVIDE INSULATION AS SPECIFIED IN SECTION 15290 ON ALL
PIPING WITHIN THE BLOWER ROOM.”
b. DELETE Piping System Schedule Note (3).
7. Section 26 13 13.10 – MEDIUM VOLTAGE METAL-CLAD SWITCHGEAR
(CIRCUIT BREAKER)
a. REPLACE Article 1.01
“Contractor shall provide labor, tools, equipment and materials necessary to
refurbish the medium voltage feeder compartment as identified in the contract
drawings. The refurbished compartment shall be compatible with GE PowerVAC
THE PORTLAND WATER DISTRICT
PWD CIP NO. 21-796 ADDENDUM NO. 3
PWD CIP NO. 21-796 Page 3 of 6 6/19/2015
15kV Metalclad Switchgear construction.”
b. DELETE Article 1.02.F
c. RENUMBER 1.02.G to 1.02.F
d. RENUMBER 1.02.H to 1.02.G
e. RENUMBER 1.02.I to 1.02.H
f. RENUMBER 1.02.J to 1.02.I
8. Section 26 24 19 – INTELLIGENT MOTOR CONTROL CENTER
a. ADD Article 3.01.D
“D. The Intelligent Motor Control Center shall undergo an Acceptance Testing
at the Vendor location. The Vendor shall make provisions to receive the
PLC control panel and test in conjunction with the Intelligent Motor
Control Center to comply with Portland Water District SCADA Standards
prior to final shipment to the Facility. MCC and PLC Control shall be
powered up, and communications shall be tied together for comprehensive
testing by owner and SCADA integrator.”
9. Section 40 91 00 – INTELLIGENT MOTOR CONTROL CENTER
a. REPLACE Article 1.03C
“C. PLC control panels supplied under this contract shall comply with the
Specifications and the Portland Water District SCADA Standards. PLC
control panels shall undergo Factory Acceptance testing at the panel
manufacturer facility for I/O functionality based on the specifications of the
Portland Water District SCADA standards. Additional Factory Acceptance
testing will be required of the Motor Control Center in conjunction with the
PLC panel onsite at the MCC vendor location. PLC panel will be required
to transport to the MCC vendor for this testing and then delivered to the
client site once testing is complete.”
10. Section 40 91 00
a. ADD Data Sheet 40 91 00 2.06A – Alarm Signaling Light. Refer to Data Sheet
in Attachment No. 2.
C. CHANGES TO DRAWINGS
1. Drawing A01
a. DELETE Notes 5 and Note 6 and REPLACE with:
"5. PROVIDE A 2" THICK ACOUSTIC PANEL AT THE UNDERSIDE OF
THE PORTLAND WATER DISTRICT
PWD CIP NO. 21-796 ADDENDUM NO. 3
PWD CIP NO. 21-796 Page 4 of 6 6/19/2015
PENTHOUSE LOUVER CEILING ON WEST END OF BLOWER
ROOM. SEE SECTION A/A-2. SIZE OF ACOUSTIC PANEL SHALL
MATCH THE SIZE OF PENTHOUSE LOUVER AND SHALL BE
PROVIDED BY LOUVER MFR.
6. INSTALLATION TO BE COMPLETED IN ACCORDANCE WITH
MANUFACTURERS SPEFICICATION. OWNER SHALL SELECT
COLOR FROM MANUFACTURERS FULL RANGE OF COLORS.
BASIS OF DESIGN ARE ALPHASORB HIGH IMPACT ACOUSTIC
PANELS AS MANUFACTURED BY ACOUSTICAL SOLUTIONS OR
APPROVED EQUAL."
2. Drawing A02
a. ADD the following to the end of Note1:
"... SURFACE PREPERATION FOR CRYSTALLINE WATERPROOFING
INSTALLATION SHALL BE IN ACCORDANCE WITH MFR WRITTEN
INSTRUCTIONS."
3. Drawing A03
a. Drawing A03 is reissued. Refer to the revised drawing A03 in Attachment No. 1.
4. Drawing R04
a. Drawing R04 is reissued. Refer to the revised drawing R04 in Attachment No. 1.
5. Drawing M05
b. Drawing M05 is reissued. Refer to the revised drawing M05 in Attachment No. 1.
6. Drawing M07
c. Drawing M07 is reissued. Refer to the revised drawing M07 in Attachment No. 1.
7. Drawing E10.01
a. DELETE Keyed Note 1 and REPLACE with:
“1. DISCONNECT AND REMOVE EXISTING MEDIUM VOLTAGE
CIRCUIT BREAKER, CTS, RELAY, DISPLAYS AND DOOR UNIT.
PROVIDE NEW COMPARTMENT WITH CIRCUIT BREAKER, CTS,
NEW DIGITAL PROTECTIVE RELAY UNIT AND DOOR. PROVIDE
ALL NECESSARY ADDITIONAL HARDWARE AND SUPPORTS
FOR INSTALLATION. REFER TO SPECIFICATIONS FOR TRIP
TYPES AND SETTINGS. REFER TO VENDOR DOCUMENTATION
FOR INSTALLATION REQUIREMENTS.”
E. Bidding Questions
The following questions and answers are questions received as of June 17, 2015.
THE PORTLAND WATER DISTRICT
PWD CIP NO. 21-796 ADDENDUM NO. 3
PWD CIP NO. 21-796 Page 5 of 6 6/19/2015
Q1: Does the fill under the slab between sedimentation basin 2 and 3 contain
hazardous soil?
A1: No, the note on C-02 only covers the soil removal shown on the C-01 and C-
02. The fill above the tunnel roof is assumed to be clean.
Q2: What is the weight limitations for construction equipment between the end of the
aeration basins and the sedimentation basins?
A2: Weight limitations for construction equipment are up to the contractor’s means
and methods such that no damage is caused to existing structures and
utilities. Refer to Specification Section 01170 paragraph 1.03.A, and General
Conditions articles 7.01.A and 7.12.A.3. If contractor desires to temporarily place
or move heavy loads on or adjacent to existing structures and utilities that in the
opinion of the Engineer may cause damage to the existing structures and utilities,
the contractor shall submit for approval to the Engineer plans and calculations
signed and sealed by a Professional Engineer licensed in the State of Maine
indicating that the application of the temporary loads will not exceed the load
capacities of the existing structures or utilities. Archive record drawings of the
existing structures and utilities will be available for review after the contract has
been awarded.
Q3: What is the weight limitation for construction equipment between sedimentation
basin 2 and 3 over the tunnel?
A3: Prior to any demolition work or modification of the tunnel roof between
sedimentation basin 2 and 3, and after the completion of all structural
modifications to the tunnel roof as shown on the contract drawings, the tunnel
roof can safely support a uniform load of 250 pounds per square foot over its
entire area in addition to the existing fill material on top of the roof. During the
work, the load that the tunnel roof can safely support depends on the contractor’s
construction sequence and means and methods of performing the work. See the
response to the question above for additional information.
Q4: Please clarify the process insulation and heat trace. Note 2 on sheet 15390-3
appears to be in error. “Provide heat trace insulation as specified on all exterior
exposed piping within the blower room.”
A4: Insulation only is to be provided for all air piping within the blower room.
Specification notes updated.
Q5: Reference drawing C-02. Note 6 indicates soils to be excavated and disposed of as
a special waste. Does this also apply to the soil to be excavated above the
proposed blower room shown on drawing S-10?
A5: No, the note on C-02 only covers the soil removal shown on the C-01 and C-
THE PORTLAND WATER DISTRICT
PWD CIP NO. 21-796 ADDENDUM NO. 3
PWD CIP NO. 21-796 Page 6 of 6 6/19/2015
02. The fill above the tunnel roof is assumed to be clean.
Q6: Ref drawings A-2, S-12 and M-07. Please furnish a detail for the pipe and HVAC
penetrations thru the roof of the tunnel. Will these sleeves need to be flashed or
sealed? Are sleeves for the future blower to be installed and capped?
A6: Pipe penetrations through the roof of the tunnel are detailed in Section D-D on
drawing S12. HVAC penetrations through the roof of the tunnel are detailed in
Sections G-G or H-H on drawing S12, depending on location. The sleeves need
to be sealed with a silicone seal. The sleeves for the future blower shall be
installed and capped.
Q7: Reference drawing A-2. Please clarify the note “Acoustical Panel” on the HVAC
Inlet
A7: See note 5 on A-1.
Q8: Reference drawing A-2, Note 1. Please clarify the surface prep, required for the
crystalline waterproofing to be applied on top of the tunnel roof. Has this surface
been previously coated?
A8: See revision to Note 1 on sheet A-2 in Addendum 3. Record Drawings do not
show any existing coatings above the tunnel between Primary Sedimentation
Tanks 2 and 3.
Q9: Reference drawing A-3, Finish Schedule. Please clarify the note Gyp Bd / Pt for
the walls in the electrical room. Will the north wall of the blower room require
sealer?
A9: See attached revised A-3 drawing.
Q10: Reference drawing S-40 thru S-46. Please indicate the location and quantity of
pipe support types 6, 6A, 6B, 7, 8 and 9 on the plan view drawings.
A10: The Air Pipe Support Schedule on drawing S40 indicates the pipe support type to
be used at each pipe support number. The table of Air Pipe Support Dimensions
on drawing M09 and the mechanical drawings indicate the location of the air pipe
supports. Contractor to coordinate.
Q11: Are the structural steel pipe support frames to be painted or galvanized?
A11: Galvanized, in accordance with note PA-2 on drawing S40.
Q12: Reference drawing S-42. Section F/S-44 is not on drawing S-44.
A12: Section F is on drawing S44, between Sections E and G and above Section S.
THE PORTLAND WATER DISTRICT
PWD CIP NO. 21-796 ADDENDUM NO. 3
PWD CIP NO. 21-796 Page 7 of 6 6/19/2015
Q13: Reference drawings M-01 and M-10. Would it be acceptable for pipe penetrations
thru existing concrete walls be core drilled and linc sealed and the pipe
penetrations thru new concrete walls be made with a D.I. wall pipe, with flanges
drilled and tapped, cast within the wall? Wall pipes that penetrate gang forms are
not advisable.
A13: Yes, pipe penetrations can be core drilled and link-sealed for existing walls and
drilled and tapped flanged wall pipes cast into the wall for new walls. Mechanical
joints shall be utilized for underground piping.
Q14: Please indicate the distance between the 36’’ x 24’’ cross shown on drawing M-
04 and the support number S-005 on the 36’’ header shown on M-05.
A14: The distance between the cross and support number S-005 is 23'-4".
Q15: Reference spec. 15390, page 3. Please clarify which piping is to be heat-traced
and insulated.
A15: Insulation only is to be provided for all air piping within the blower room.
Specification notes updated.
Q16: Please provide a specification for the pipe sleeves between the top of the tunnel