7013 - Lake Lewisville Water Treatment Plant Phase II Improvements, Addendum 2- Modification to the Specs (3)Addendum No. 2 00 05 15 - 1
DTN18104 – Lake Lewisville Water Treatment Plant Phase II Improvements
CITY OF DENTON
LAKE LEWISVILLE WATER TREATMENT PLANT PHASE II IMPROVEMENTS
DTN18104
ADDENDUM NO. 2
May 13, 2019
BID DATE: Tuesday, May 21, 2019 at 11:00 A.M.
00 05 15 ADDENDUM NUMBER 2
The following additions, deletions, modifications, or clarifications shall be made to the appropriate
sections of the Contract Documents. Bidders shall acknowledge receipt of this Addendum in the space
provided on the Bid Form.
CONTRACT DOCUMENTS:
A2-1. SECTION 00 05 15 –ADDENDUM NO. 1
A. Reference Item A1-21 A.2 (LRW-9, Note 10)
1. Clarification: Reference to two 2-DSP-SS lines …in Section 3 is intended to mean the line
shown and corresponding line in the pipe to the upper intake (at El. 505).
B. Reference Item A1-21 B.1 (LRW-9, Section 3)
1. Modification: Delete the text “36-RW-PCC” and replace with “36-RW-PCC FROM 5’-0”±
OUTSIDE OF WETWELL TO THE INTAKES. 36-RW-CI FROM 5’-0”± OUTSIDE OF THE
WETWELL TO THE FLANGED CONNECTION”.
2. Clarification: Reference Appendix for drawing of wall sleeve in original construction.
5-13-2019
Addendum No. 2 00 05 15 - 2
DTN18104 – Lake Lewisville Water Treatment Plant Phase II Improvements
C. Reference Item A1-21 A.3 (LRW-9, Note 11)
1. Modification: Revise Note 11 to read: “THE CONTRACTOR SHALL INSTALL A 2” TAP ON
EACH 36-RW-CI BETWEEN THE WETWELL WALL AND THE GATE VALVE. CONTRACTOR
SHALL UTILIZE A STAINLESS-STEEL SADDLE (FORD METER BOX FS343-3870-TAP-Q STYLE
OR APPROVED EQUIVALENT). THE CONTRACTOR SHALL UTILIZE A FULL PORT 316SS BALL
VALVE OR 316SS CORPORATION STOP. THE 2-DSP-SS SHALL PASS THROUGH THE BALL
VALVE/CORPORATION STOP AND INTO THE 36-RW-CI AND 36-RW-PCC AS SHOWN ON
THE DRAWINGS. ”
D. Reference Items A1-23 and A1-24
1. Modification: The lines originally designated “CW” on Sheets RRW-CF-5 and RRW-CF-6
are PSW (Plant Service Water), downstream of a backflow preventer.
A2-2. SECTION 00 41 00 – BID FORM
A. Reference Bid Form
1. Modification: Replace the Bid Form with the revised Form attached.
B. Reference Exhibit 1 – IFB 7013 Pricing Sheet
1. Modification: Replace the Pricing Sheet following the Bid Form with the revised Pricing
Sheet attached, and use the updated spreadsheet for Bid Submission.
TECHNICAL SPECIFICATIONS:
A2-1. SECTION 01 29 01 MEASUREMENT AND BASIS FOR PAYMENT
1. Addition: Insert the new specification section attached.
A2-2. SECTION 33 31 13.16 HDPE PIPING
1. Addition: Insert the new specification section attached.
A2-3. SECTION 40 05 23.23 STAINLESS STEEL PROCESS PIPE FOR LIQUID SERVICE
1. Clarification: Several references are made to Sections 33 05 05 and 40 05 05, which are
not included in project. Comply with other conditions and specifications provided to
complete and verify the installation.
A2-4. SECTION 40 05 64 BUTTERFLY VALVES
A. Reference Paragraph 1.02 A. Acceptable Manufacturers:
1. Addition: Add “5. AV-Tek” as an acceptable manufacturer.
A2-5. SECTION 40 05 65.23 SWING CHECK VALVES
B. Reference Paragraph 2.01 SWING CHECK VALVES
1. Addition: Insert the new paragraph F:
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DTN18104 – Lake Lewisville Water Treatment Plant Phase II Improvements
“F. In lieu of Swing Check Valve with Air Cushion Cylinder, Rubber Flapper Swing Check
Valves may be provided. The valve body and cover shall be ASTM A536, Grade 65-45-12
ductile iron or ASTM A126 Class B gray iron. Valve shall provide flow area equal or
greater than nominal pipe flow area. The flapper shall be Buna-N having an O-Ring
seating edge and be internally reinforced with steel. Rubber flapper check valves shall
be Val-Matic Surgebuster, Series 7200, or pre-approved equal.”
A2-6. SECTION 40 90 00 INSTRUMENTATION AND CONTROL FOR PROCESS SYSTEMS
1. Reference: Par. 1.04.B
Modify the list of pre-qualified SCADA System Integrator Contractors for PLC
programming and system configuration to be the following:
1. “Prime Controls
2. Signature Automation (Contact: Rick Hidalgo, PH: 469-619-1241)
3. Walker Engineering (Contact: Stephen Gann, PH: 817-540-7777)
4. No others will be accepted.”
2. Reference: Par. 1.04.C
Modify the list of pre-qualified SCADA System Integrator Contractors for hardware to be
the following:
1. “Prime Controls
2. Walker Engineering (Contact: Stephen Gann, PH: 817-540-7777)
3. No others will be accepted.”
A2-7. SECTION 40 90 02 SUPERVISORY CONTROL AND DATA ACQUISITION (SCADA) SYSTEM
1. Reference: Par. 1.03.A
Modify the list of pre-qualified SCADA System Integrator Contractors for PLC
programming and system configuration to be the following:
1. “Prime Controls
2. Signature Automation (Contact: Rick Hidalgo, PH: 469-619-1241)
3. Walker Engineering (Contact: Stephen Gann, PH: 817-540-7777)
4. No others will be accepted.”
2. Reference: Par. 1.03.B
Modify the list of pre-qualified SCADA System Integrator Contractors for hardware to be
the following:
1. “Prime Controls
2. Walker Engineering (Contact: Stephen Gann, PH: 817-540-7777)
3. No others will be accepted.”
Addendum No. 2 00 05 15 - 4
DTN18104 – Lake Lewisville Water Treatment Plant Phase II Improvements
A2-8. SECTION 41 22 13.13 BRIDGE CRANE REHABILITATION
A. Reference: Par. 1.01 WORK INCLUDED:
1. Addition Insert the new paragraph B:
“B. The existing bridge crane is indicated to have a 10 ton capacity, with a span of 17’-10”
(center to center between the support rails) as indicated on original drawings. At
Contractor’s option, it is permissible to remove the existing equipment from the project
site to facilitate the rehabilitation work.”
A2-9. SECTION 46 35 11 COPPER ION SOLUTION GENERATOR
B. Reference: Par. 2.01 B.
1. Modification: In the last line of the table, for “Input Voltage”, modify entries for both
locations to read “240 VAC or 120 VAC, 60 Hz, 1 Phase”.
DRAWINGS:
A2-10. SHEET G-1, SEQ. 1
A. Reference: INDEX TO DRAWINGS:
1. Modification: Add the following text to the end of the INDEX TO DRAWINGS:
“STANDARD DETAILS
207 SD-1 MECHANICAL STANDARD DETAILS
208 SD-2 MECHANICAL STANDARD DETAILS
209 SD-3 PIPE TRENCH DETAILS”.
A2-11. SHEET G-6, SEQ. 6
A. Reference: INSET – VALVE DETAIL:
1. Clarification: Valve box and extension stem required for buried valves as specified.
2. Clarification: Record drawings of original pipe and valve construction added to
Appendix.
A2-12. SHEET HS-1, SEQ. 15
A. Reference: PLAN, Filtered Water Line:
1. Clarification: See 2014 Phase I project piping added to Appendix, including “Pipe
Connection Detail 5” on Sheet CP-11. East-west pipe segment currently consists of C-302
from original construction, to be removed and replaced with RCC, mortar lined and
coated steel pipe, or ductile iron pipe.
2. Clarification: Elbow from 2014 project to be replaced as shown with new tee and plug,
and south end of 2014 north-south run modified to delete reducer and add new
butterfly valve.
B. Reference: PLAN, Buried Butterfly Valves:
Addendum No. 2 00 05 15 - 5
DTN18104 – Lake Lewisville Water Treatment Plant Phase II Improvements
1. Clarification: Refer to Appendix for information on Owner provided butterfly valves and
for drawings of existing piping for appropriate end conditions. Field determine end
conditions where necessary.
A2-13. SHEET HS-5, SEQ. 19
A. Reference: NOTES BY SYMBOL:
1. Modification: Revise Note 2 to read: “NORTH VAULT ONLY. LOCATE VAULT TO
INCORPORATE EXISTING SAMPLE LOCATION. REPLACE PIPING FROM TAP CONNECTION
TO LABORATORY AS INDICATED ON SHEET HS-1, NOTE 5.”
B. Reference: SECTION 6:
1. Clarification: Note By Symbol No. 2 also applies to the small diameter piping at right side
of vault in this section.
A2-14. SHEET F-1, SEQ. 21
A. Reference: GENERAL NOTES, Note 8:
1. Clarification: Vertical extent of cleaning and painting shall be to the flange set shown in
Section 1 (lower left corner) to receive replacement hardware.
A2-15. SHEET F-4, SEQ. 24
B. Reference: GENERAL NOTES:
1. Modification: Revise Note 4 to read: “REPLACE THE NUTS, BOLTS, WASHERS, AND
COUPLING THRUST RESTRAINT RODS (TWO COUPLINGS) ON THE 30-INCH COAGULATED
WATER LINE WITH 316SS HARDWARE. THE LINE IS WELDED STEEL WITH FLANGES AT
EACH END. IN ADDITION TO THE REPLACEMENT OF THE HARDWARE, REPLACE THE
FLANGE GASKETS AT EACH END.”
A2-16. SHEET CF-1, SEQ. 25
A. Reference: POLYMER FEEDER PIPING:
1. Clarification: Neat polymer supply line is from adjacent tanks, and may be reused
beyond vicinity of new feeders.
A2-17. SHEET A-1, SEQ. 26
A. Reference: ROOM FINISH SCHEDULE:
1. Modification: Change Ceiling Material in Lake Lewisville WTP Raw Water Intake –
Chemical Building Rooms 101 and 102 to “PT-STLD” (painted steel deck).
2. Modification: Change Ceiling Material in Lake Ray Roberts WTP Raw Water Intake –
Chemical Building to “PT-GYP” (gypsum wallboard finished and painted).
A2-18. SHEET LRW-1, SEQ. 133:
A. Reference: OVERALL SITE PLAN – POTABLE WATER TAP:
1. Clarification: Water meter and meter box to be furnished by Lake Cities Municipal
Authority or Owner.
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DTN18104 – Lake Lewisville Water Treatment Plant Phase II Improvements
A2-19. SHEET LRW-5, SEQ. 137
A. Reference: Chemical Injection Vaults located on the northern side of the drawing.
1. Modification: Delete “2” HOT TAP WITH 316SS CHEMICAL INJECTION QUILL (REFER TO
NOTE 6)” and replace with “2” CHEMICAL INJECTION (REFER TO NOTE 6)”.
2. Modification: Delete “2” HOT TAP WITH 316SS FULL PORT BALL VALVE (CARRIER WATER
SUPPLY)” and replace with “CONNECT TO EXISTING TAP (REFER TO NOTE 9)”.
B. Reference: GENERAL NOTES.
1. Modification Add the following text to Note 6:
“THE CONTRACTOR SHALL REMOVE THE EXISTING 4-INCH FLANGE AND PROVIDE
FURNISH A 1”x4” 316SS THREADED REDUCING FLANGE FOR THE CHEMICAL INJECTION
ASSEMBLY. REFER TO SHEET LRW-CF-8 FOR ADDITIONAL DETAILS.”
2. Add General Note 9 to read:
“9. CONTRACTOR SHALL MODIFY CONNECTIONS TO EXISTING TAPS. REFER TO SHEET
LRW-CF-8 FOR ADDITIONAL DETAILS.”
C. Reference: OVERALL YARD PIPING PLAN, Penetration Detail Callouts.
1. Modification: Replace all references to “Detail 342 Type D” to “Detail 342 Type T”.
A2-20. SHEET LRW-9, SEQ. 141
A. Reference: SECTION 3, at top of Gate Valve Stem:
1. Modification: Delete reference to Standard Detail 374 and add “per manufacturer’s
recommendation.”
A2-21. SHEET LRW-CF-8, SEQ. 158
1. Modification: Replace the sheet with the new sheet attached.
2. Clarification: Utilize existing connections to transmission pipeline and revise piping
above floor slab as indicated.
A2-22. SHEET LRW-PI-2 SEQ. 180:
A. Reference: CHEMICAL FEED SYSTEM P&ID (Copper Ion Generation System):
1. Modification: The motor-operated modulating valve upstream of the system shall
precede the manual isolation valve, and is not part of the manufacturer-provided
system (similar to arrangement in RRW-PI-1).
A2-23. SHEET RRW-1, SEQ. 181:
A. Reference: PLAN – 4-PW-PVC piping west of Raw Water Pump Station (and Note 1):
1. Clarification: The potable water pipeline shall transition from HDPE to PVC outside
the building.
B. Reference: PLAN – 2-PSW-PVC and 1-PW-PVC piping inside Raw Water Pump Station and to
Chemical Feed Building:
1. Clarification: Both lines are fed by the 4” potable water line. The 2” line passes
through the RPZ and furnishes dilution water for the chemical feed systems. The 1” line
provides potable water to the fixtures in the Chemical Feed Building.
A2-24. SHEET SD-1, SEQ. 207
A. Reference: Attached Sheet SD-1; MECHANICAL STANDARD DETAILS
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DTN18104 – Lake Lewisville Water Treatment Plant Phase II Improvements
1. Modification: Add the attached SD-1.
A2-25. SHEET SD-2, SEQ. 208
B. Reference: Attached Sheet SD-2; MECHANICAL STANDARD DETAILS
1. Modification: Add the attached SD-2.
A2-26. SHEET SD-3, SEQ. 209
C. Reference: Attached Sheet SD-3; PIPE TRENCH DETAILS
1. Modification: Add the attached SD-3.
APPENDIX:
A2-27. SELECTED RECORD DRAWINGS
1. Selected record drawings from previous projects at the locations of proposed Work
have been added to the Appendix as follows:
a. 1954 LL RWPS Substructure and Inlet Details
b. 1955 4 MGD WTP Pump Room Drawings
c. 1955 4 MGD WTP Pipe Lay Sheets
d. 1972 WTP Expansion Piping
e. 1975 42 in Water Transmission Line (South)
f. 1975 Water Transmission Lay Sheets
g. 1984 HSPS Extension
h. 2014 LL WTP Phase I Improvements - Piping
END OF ADDENDUM NO. 1