NL Cypress-CS110923 ❑ � Kim ley-Horn 12700 Park Central Dr.
y Suite 1800
and Associates, Inc. Dallas, TX 75251
TEL 972 770 1300
FAX 972 239 3820
Transmittal
Date: September 23, 2011 Job Number: 063973006
Project Name: Cypress Waters Phase 1 — Lift Station
To: Kenneth M. Griffin, P.E.
Director of Engineering and Public Works
255 Parkway Boulevard
P.O. Box 9478
Coppell, Texas 75019
We are sending these by
❑ U.S. Mail ❑ FedEx ® Hand Deliver
❑ Other:
We are sending you
® Attached ❑ Under separate cover via the following items:
❑ Shop Drawings ❑ Prints/Plans ❑ Samples ❑ Specifications ❑ Change Orders
❑ Other:
Copies Date No. Description
2 09/2011 1 99% Submittal for 24 "x36" 10" Force Main & Lift Station Design Sheets
z2 09/2011 2 3r Submittal for 10" Force Main & Lift Station Preliminary Design Report
09/2011 3 Lift Station Specifications
✓1 09/2011 4 Comment Response Letter
These are transmitted as checked below:
❑ For your use ❑ Approved as submitted ❑ Resubmit ❑ Copies for approval
O As requested ❑ Approved as noted ® Submit ❑ Copies for distribution
® For review and comment ❑ Returned for corrections ❑ Return ❑ Corrected prints
Remarks:
Copy to: File Signed: Marty S. Paris, P.E.
Page 1
Comments Regarding the "Engineering Design Report, Cypress Waters
Lift Station & Force Main, Dallas, Texas" dated August 2011.
Page 1
Introduction: Reference is made to an agreement between Billingsley and the City of Coppell regarding the
10 -inch Force Main out - falling into an existing 12 -inch gravity main in Beltline Road.
1. I do not recall seeing a final version of this agreement. Does it exist and is the COD a party to this
agreement? (Same comment as previous comments)
KHA: The agreement is actively being finalized.
2. How much will COD have to pay for the ability to dispose of Cypress Water's wastewater in this
sewer line? (Same comment as previous comments)
KHA: See response to #1.
3. Is the amount COD will have to pay to dispose of wastewater in this line acceptable? (Same
comment as previous comments).
KHA: See response to #1.
4. Without questions 1, 2, and 3 answered, this project cannot continue further.
KHA: See response to #1.
5. In the opening paragraph, there is mention that the total area is 1661 acres. It is further
mentioned that the lake will assume approximately 362 acres and the development site will
assume approximately 928 acres — which leaves approximately 371 acres (almost 0.6 square
miles) un- counted in the project design. Where did these acres go and will the lack of inclusion
affect the design of the proposed and future elements of this project?
KHA: The total acreage includes some property owned by the City of Coppell around the lake
that will not be served by the Cypress Waters lift stations and collection system. The current lift
station is designed to handle the first two phases of the development. Future phases will be
handled by a larger lift station to be designed at a later time.
6. (From Shawn Halle, P.E.) Have easement documents been provided for review & approval? Please
do this as soon possible.
KHA: Yes these have been provided.
I. Design Flow Calculations: No comments at this time.
Page 2
II. Pump Head Calculations: No comments at this time; however, the ability to reopen this topic is reserved
should new information become available.
Page 3
III. Cycle Time Calculations:
Comments on 95% Cypress Waters Lift Station and Force Main Submittal.
Page 1 of 33
7. In the second paragraph (on page 4), it is pointed out that a 12 -foot diameter wet -well contains
about 846 gallons of effluent per Vertical Liner Foot. Simple calculations bear this out. In the
profile (Section 2) view shown on Sheet C -07 of the construction plans, there is shown 2000 -psi
grout filling in the bottom of the wet -well to provide positive drainage to the pumps. A slope of
5:2 is shown on the top of the grout. In the plans for Electrical Details III -E07 (No page number) is
shown a 2000 psi grout with a top slope of 1:1. Which is the correct grout slope? If the electrical
drawing is the correct slope, the volume storage calculations will likely be affected. Please show
the correct slope of the bottom of the wet -well.
KHA: The correct slope is shown on Sheet C -07. The electrical drawings will be updated
accordingly.
Page 4
IV. Net Positive Suction Head
8. After spending a little time trying to understand what, exactly, the NPSH is, I am not sure I
understand the calculation presented in this section, nor in the appendix. Apparently, the
appendix table 7 is where the NPSH was calculated. Apparently, the calculation of Barometric
pressure came from an Interpolation of Table A -7. Where and what is Table A -7?
KHA: Table A -7 is a table of atmospheric pressure at various elevations above sea level. We
have clarified in the report that we calculated the barometric pressure by taking the
atmospheric pressure at an elevation of 480.29 above sea level, which is the suction elevation
of the pump.
The Vapor Pressure was "assumed 100 °F as the maximum temperature ". Recently, considering we
had an almost 40 -day stretch of greater than 100 - degree days, perhaps this should be revised to
115 °F?
KHA: Complied.
In the text, please indicate what chart or table is being referenced rather than just stating, "See the
appendix ".
KHA: Complied.
Neither Table Appendix 7, nor the text in the paragraph indicates whether the NPSH shown is a
viable or adequate amount. Please include a conclusion statement indicating that this is an
acceptable design feature.
KHA: Complied.
V. Electrical
General
9. At this point, this is a Design Report rather than a Design Investigation. Therefore, I expect to see
how the design was accomplished, not what the parameters of the design will be. Using phrases
such as "will be" and "would be" leave me wondering if the design has been accomplished. Please
rewrite this Section to indicate what was actually done.
KHA: Complied.
Service
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 2 of 33
10. Is the design of the main breaker 200 -amps — or is it something else? Using terms like "would be"
leaves doubt in my mind as to what is being specified. The same holds true for a 260 -amp
automatic transfer switch — will this be specified or is it specified?
KHA: We revised this section to use present tense instead of future tense.
Page 5
Motor Control
11. Again, it makes more since to say something like "The Lift Station has been design with power
factor correction capacitors; each capacitor is sized to come on with one pump."
KHA: Complied.
Backup Power
12. "The generator was sized ..."
KHA: Complied.
13. Did you recommend the Generator, or who did?
KHA: This has been revised to state that "the generator size is 100 kw ".
Instrumentation and SCADA
14. No comments at this time.
Page 6
Site Lighting
15. Has the Site lighting been designed or not? "The lighting on the site should be designed ..."
KHA: Complied.
16. "Cut -off type fixtures are recommended ..." Are the "cut -off type fixtures" recommended or
specified?
KHA: Complied.
Electrical Equipment
17. In the discussion meeting we had, it was pointed out by Jim Henry that overhead rain shields were
necessary over the Electrical Panels. As the rain shield will likely be installed on the rigid
galvanized poles, the rain shields should be mentioned here.
KHA: Jim Henry provided some photographs of an example rain shield. The plans have been
revised to include a similar rain shield structure over the electrical panels.
VI. Other Considerations
Site Access
18. No comments at this time
Comments on 95% Cypress Waters Lift Station and Force Main Submittal.
Page 3 of 33
Page 7
Security
19. No comments at this time
Flood Protection
20. Because the lake is to be lowered, there is some ambiguity regarding which 100 -year water level
is being referenced in the statement "The 100 -year elevation of the lake is 510..." Is this the
current condition or is this the proposed future lake condition?
KHA: This is the current condition. We will add "current" to the report.
21. I note that the plans show the ground elevation of the lift station to be at an elevation of 513.70
feet. However, the plans are not clear as to what the elevation of the top of the lift- station is. The
design report shows what the actual Top of Slab elevation is for the lift station as being 515.00
(sheet E -07). On Sheet C -07 of the plans, the elevation of the top is ambiguous; the Natural
Ground is shown at 513.70. In the text in the Design Report, it is mentioned that the Top of Slab is
513.70. Which is it?
KHA: The top of slab is 514.45. This will be clarified in the report and on the plans.
22. TCEQ Chapter 217, item 217.35 gives guidance on what should be provided when a site is within
1000 feet of a 100 -year flood plain. Please show the floodwater limits and indicate the FEMA map
from which this information was obtained on a site plan of the lift station. (Sheet C -08 may be an
attempt to show this; however, the FEMA Map number is not shown.)
KHA: The FEMA map number has been added to the plans.
Ventilation and Odor Control
23. There is an ambiguity concerning the volume of the wet -well. The elevation of the top of the wet -
well seems to be either 515.00 or 513.70. If the wet -well is assumed to be a 12 -foot diameter
cylinder, the volume is either 3,958 ft (35 feet tall) or 3,811 ft (33.70 feet tall), neither of which
are the volume mentioned in this report. How did you calculate this volume? Will a minor
discrepancy in the volume of air to be exchanged make any changes in the media life calculation?
KHA: The volume will be corrected in the report. This will not affect the media life.
Piping and Valves
24. In addition to what is stated in this paragraph, All brackets, fixtures, and other appurtenances
shall be Type 316 Stainless Steel.
KHA: Complied.
Page 8
Metering
25. How will the meter vault be secured? Will there be a pad -lock, a hasp and key arrangement, etc?
KHA: The meter vault hatch doors will be padlocked similar to the access gate. We will add this
information to the report.
26. In the meeting wherein we discussed the comments, I believe a comment was made regarding
having the flow meter read -out on a pole near the facility. How will this be secured? Has the
external meter readout been specified?
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 4 of 33
KHA: A detail for the pedestal has been added to the plans.
27. I do not see the meter box on the site plan on the "Lift Station Site Plan (no sheet number) ".
Where is this?
KHA: The site plan has been updated to show the meter box.
Emergency Provisions
28. In comment number 10 of the 30% review (dated 07/06/11), it was pointed out that in an
emergency situation, it may be difficult for maintenance personal to travel from the closest
Maintenance center to the lift station location. Further, it was mentioned that the storage of
wastewater in the wet well would be required to be about 150,000 gallons (approximately 20,054
cubic feet). In our discussion meeting, several alternatives were considered as to how to provide
this amount of emergency storage. It was left with the Design Engineer to find a way to provide
this additional storage.
TCEQ, Chapter 217, Item 217.63. Emergency Provisions for Lift Stations (d)(2) offers that an On-
Site Generator may be used, "if the peak flow can be stored in the collection system ". I am not
clear on how the emergency retention numbers were calculated. According to Page 3, III. Cycle
Time Calculations, a 12 -foot diameter wet -well has a potential storage of about 846 gallons per
vertical foot. According to the design plans (sheet C -07), the bottom of the wet -well is at an
elevation of 480, with a minimum water surface elevation of 482.00. The top of the lift station
appears to have an elevation somewhat higher than 513.70 — meaning that the lift station is
approximately 31.7 feet deep. 31.7 feet deep times 846 gallons per VLF equals 26,818 gallons —
roughly one -half of what is shown in these calculations. Of course, without design plans of the
conventional wastewater lines, I cannot calculate the storage in the pipe. However, the problem
still remains that we cannot get to the lift station during an emergency. The lift station wet -well is
too small. This must be redesigned.
KHA: This was discussed at the 95% comments review meeting and KHA provided the
calculations for the storage. The total capacity takes in to account the storage in the gravity
system in addition to the wet well, as allowed by TCEQ. The issue of response time was also
discussed. KHA showed that the response time was 1.5 hours during average flow in Phase 2.
DWU agreed that this is adequate. The design report now includes response times for Phase 1
and Phase 2.
Comments on 95% Cypress Waters Lift Station and Force Main Submittal.
Page 5 of 33
Comments Regarding the 10" Wastewater Force Main ad Lift Station from
S. Beltline Road to Lift Station Cypress Waters — Phase I - TIF (95% Review)
Cover Page
1. Please obtain 4110 Numbers and sheet numbers for all pages.
KHA: Sheet numbers have been requested from the DWU vault.
2. Although the Contract Number has probably not been assigned, do not forget to place it in the
appropriate spot.
KHA: We will add the contract number once it is assigned.
Sheet C -01
General Notes
3. Number 1: Change the reference to the Dallas Addendum to the "Latest Version of City of Dallas
Addendum to the NCTCOG Public Works Construction Standards"
KHA: Complied.
4. Number 2: Change the reference to the DWU Standard Drawings to "Latest Edition ".
KHA: Complied.
5. Number 4: Add sentence: It is the Contractor's responsibility to locate any existing utilities prior to
beginning construction. NO SEPARATE PAY ITEM."
KHA: Complied.
6. Number 5: Misspelling — "Location" should be "Locating ".
KHA: Complied.
7. Number 6: Replace the word "HIS" and replace with "The Contractor's ".
KHA: Complied.
8. Number 11: Is the engineer not going to produce a Traffic Control Plan for the street cut on
Beltline?
KHA: No street cut is necessary at Beltline since the force main does not cross anymore. Some
minor traffic control may still be necessary on Beltline, and the Contractor will coordinate that
through City of Coppell as instructed in this note.
9. Number 12: NCTCOG Item 6.7.2.(1).(3) is in reference to 1998 NCTCOG Spec. Please update this
reference to Version 4, 2004 edition.
KHA: Complied.
10. Number 15: Change the wording to "Latest Edition ", rather than "January 2010 Edition ".
KHA: Complied.
11. Number 17: What is effective difference between numbers 4 and 17?
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 6 of 33
KHA: These notes will be combined.
12. Number 18: I think there have been so many problems with Manhole rims that we are removing the
0.5' above ground in landscaped areas.
KHA: Will be revised to say all manhole rims shall be adjusted according to DWU standard
drawings.
13. Fill In 411Q Numbers
KHA: Sheet numbers have been requested from the DWU vault.
14. Place State Plain (NAD 88) Coordinates on Benchmarks. (Elevations will remain NAD27).
KHA: Benchmarks are for vertical control only. Control points will be added to the Overall Site
Map sheet for horizontal control.
Sheet C -02
15. I understood from Number 11 of the General Notes that the City of Coppell was requiring this
Developer to bore Beltline Road. The Plans do not seem to be showing this. We will need a copy of
the Approved, Signed, and Sealed, As -built (Record) Drawings of the proposed WW lines in Beltline
prior to beginning construction.
KHA: The WW line we are tying into is currently under design. Signed and sealed plans will be
provided when they are available.
16. City Limit Lines Style not DWU Standard. Please correct.
KHA: Complied.
17. There are several "dashed- Line" sets, which often indicate easements, shown on this drawing. Often
we need an easement to cross power lines, gas lines, etc. Are these easement lines? If so, please
label what type of easement they are and their recording information. Additionally, please provide
signed and recorded crossing easements for the Force Main.
KHA: Complied.
18. DWU has a set of Drafting Standards. Please use the DWU Symbology for these plans. Specifically,
the PC, curve information, and PT are not shown according to DWU standards.
KHA: Complied.
19. There are at least 2 waterline / Force Main crossings. The water lines will have to be encased.
KHA: The water lines are above the force main, so no encasement is necessary.
20. There appear to be no future plans for non - potable water lines in the streets. I thought this was one
of the reasons we were reducing the amount of water required. Please make appropriate provisions
for non - potable water lines in the street. This will likely demand a redesign. The Project cannot
continue without following through with the agreement.
KHA: The irrigation lines have been designed and are be shown on the plans.
21. What is the nominal Street Width? Please show in several places along the streets.
KHA: Complied.
22. Place State Plain (NAD 88) Coordinates on Benchmarks. (Elevations will remain NAD27).
Comments on 95% Cypress Waters Lift Station and Force Main Submittal.
Page 7 of 33
KHA: The benchmarks are for vertical control only. We will add control points to the Overall Site
Map sheet for horizontal control.
23. There is a crossing between station 7 +63 and 8 +03 where the Force Main has been depressed. Show
"tic" marks and make callouts in Plan View. Please follow DWU Drafting standards.
KHA: Complied.
24. The slope between stations 8 +03.26 and 9 +89.96 calculates to 0.76% rather than 0.80 %.
KHA: Slope is correct.
25. (From Shawn Halle) Match Mark at Station 10 +00 should be C -03 rather than C -02. Please correct.
KHA: Complied.
Sheet C -03
26. There are at least 3 waterline / Force Main crossings. The water lines will have to be encased.
KHA: The water lines are above the force main, so no encasement is necessary.
27. At Station 19 +41 a Plug Valve is being spec'ed. What is a Plug Valve? I do not think that DWU allows
a Plug Valve.
KHA: Plug valves are common in force main applications. KHA provided some documentation on
this at the 95% review meeting. Additionally, plug valves are already in use on other DWU
facilities. DWU agreed that the plug valves are okay.
28. (new) There is a combination air -vac calve shown at approximately 19 +95. It seems to be called out
as station 19 +90.15. Please adjust either the call -out or the graphic.
KHA: The callout for the air -vac valve is combined with the bend. The station shown is for the
location of the bend, and the air -vac valve is adjacent to it as shown on the plans.
29. Don't forget Sheet Numbers.
KHA: Sheet numbers have been requested from the DWU vault.
30. At station 16 +42 is an 8" WW line that is 18 feet deep. Why so Deep?
KHA: The depth is correct. The gravity lines for this project are quite deep in some areas.
31. Don't forget 411Q Page Numbers.
KHA: Sheet numbers have been requested from the DWU vault.
32. Please show street widths.
KHA: Complied.
33. Place State Plain (NAD 88) Coordinates on Benchmarks. (Elevations will remain NAD27).
KHA: The benchmarks are for vertical control only. We will add control points to the Overall Site
Map sheet for horizontal control.
34. There is a crossing between station 19 +49 and 19 +90 where the Force Main has been depressed.
Show "tic" marks and make callouts in Plan View.
KHA: Complied.
35. The VPI at station 12 +05 lacks an elevation (I calculate 517.50). Please provide.
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 8 of 33
KHA: Complied.
36. The segment between station 14 +14.52 and 14 +18.76 calculates to a slope of 4.48 %.
KHA: Slope is 4.43 %. This will be labeled on the plans.
37. (From Shawn Halle, P.E.) At station 19 +50, there is a high point with the potential to trap air and no
way to release it. Please include a combination air -vac valve at this location. Please correct.
KHA: This was discussed at the 95% review meeting and it was decided that the current
arrangement of air -vac valves was adequate and thus this comment was discarded.
38. (From Shawn Halle, P.E.) Match Mark at station 20 +00 should be C -04 rather than C -03. And, the
Match Mark at station 10 +00 should be C -02. Please correct.
KHA: Complied.
Sheet C -04
39. There are at least 2 waterline / Force Main crossings. The water lines will have to be encased.
KHA: The water lines are above the force main, so no encasement is necessary.
40. Please show Street Widths.
KHA: Complied.
41. Place State Plain (NAD 88) Coordinates on Benchmarks. (Elevations will remain NAD27).
KHA: The benchmarks are for vertical control only. We will add control points to the Overall Site
Map sheet for horizontal control.
42. There is a crossing between stations 29 +59 and 30 +00 where the Force Main has been depressed.
Show "tic" marks and make callouts in Plan View.
KHA: Complied.
43. The Crossing between Station 29 +59 and 30 +00 appears to be crossing a WW line. Why is the WW
Line so deep?
KHA: The depth is correct. The gravity lines for this project are quite deep in some areas.
44. Station 29 +59 indicates there is a PVI. My calculations do not show a PVI at this location.
KHA: This is a vertical bend, which is called out as a PVI according to DWU cad standards.
Sheet C -05
45. Use Standard DWU Symbology and Notation. Note that at about Station 31 +00 and again at station
33 +00, the profile calls for a Vertical Curve. Please use standard notation and include the tern
"Vertical" on the call out.
KHA: Complied.
46. Between Station 35 +43 and 36 +68 is a crossing. Please show the "tic" marks in the plan view and
make call -outs.
KHA: Complied.
Comments on 95% Cypress Waters Lift Station and Force Main Submittal.
Page 9 of 33
47. At Station 38 +02 and 38 +05 is a crossing. Please show the "tic" marks in the plan view and make
appropriate call -outs.
KHA: Complied.
48. Place State Plain (NAD 88) Coordinates on Benchmarks. (Elevations will remain NAD27).
KHA: The benchmarks are for vertical control only. We will add control points to the Overall Site
Map sheet for horizontal control.
49. The elevation at Station 30 +00 has been deleted. Please provide.
KHA: Complied.
50. The elevation at Station 31 +50 appears to be incorrect. (I calculate 523.73.) Please correct.
KHA: Complied.
51. The elevation at Station 33 +62.13 appears to be incorrect. (I calculate 509.12.) Please Correct.
KHA: Complied.
Sheet C -06
52. There is an Electrical Pad shown on the Lift Station with the call out "Electrical Transformer Pad Per
Oncor Detail ". What Detail is that? Is it a part of the plans? Please include the Transformer Details in
the plan and a sheet call out.
KHA: A detail for the transformer pad has been added to the plans.
53. See Comment under Electrical Equipment on Page 6 of the Engineering Design Report. A Rain Shield
will be required over the Electrical Panels.
KHA: Complied.
54. I do not see a meter reading pedestal shown on the site plan near the Meter Vault. Please show. See
comment for Page 8, Metering.
KHA: Complied.
55. Contour 516 at the entrance to the Lift Station does not appear to be correct. Please look at this and
adjust.
KHA: Complied.
56. In the area where it is marked "No Grading In This Area ", is this the lake as it now exists? Please
mark as 100 -year flood plain and show FEMA Map information.
KHA: Complied.
57. The Electrical Equipment Rack calls out a reference on page E -01. This is probably in error. Sheet E-
01 does not detail or show very much about the Electrical Rack. Please provide the correct
reference.
KHA: Complied.
58. (From Shawn Halle, P.E.) Lift station site draings to the north. Will an offsite drainage easement be
provided?
KHA: The site drains to the lake, so an offsite drainage easement is not necessary.
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 10 of 33
59. (new) In general notes numbers 2 and 9, reference is made to NCTCOG Fourth Edition Technical
Specifications. In each case, this should read: "North Central Texas Council of Governments, Public
Works Construction Standards, October 2004 edition, as amended by the latest edition of the City of
Dallas Addendum to the North Central Texas Council of Governments, Public Works Construction
Standards."
KHA: Complied.
Sheet C -07
General Notes
60. Number 1: What does this mean and why is this necessary?
KHA: This refers to the openings around the access hatch frames. More detail will be added to the
note.
61. Number 2: "Bilco or equal" is mentioned. What Part number?
KHA: This information is provided in the equipment list. We will revise the note to reference the
equipment list.
62. Number 3: Should the Contractor submit verification Drawings to the Engineer or the OWNER
(Billingsley or DWU)?
KHA: Typically they are submitted to the Engineer.
63. Number 4: What does this mean? Why is it here? Do you mean to say something else?
KHA: This note will be revised to include the full name of the specification in reference.
64. Number 5: What kind of couplings — Electrical, Structural, Railroad, etc?
KHA: Will add "pipe" before couplings for clarification.
65. Number 7: What diameter are the Type 316 Stainless steel restraining rods?
KHA: The detail on Sheet C -10 provides specifics on the lateral pipe supports.
66. Number 9: All brackets, fixtures, and other appurtenances shall be Type 316 Stainless Steel. See
comments for Page 7, Piping and Valves. There should be no dissimilar metals allowed in the wet -
well. If this comment is referencing those areas not in the wet well, then this should be said.
KHA: This note will be revised to clarify.
67. Number 10: This item discusses penetrations through the wet -well wall and that penetrations shall
be "... sealed to prevent leakage ". TCEQ, 217.60. Lift Station, Wet Well, and Dry Well Design, (b) Wet
Well, (2) states: "Penetration through a wet -well wall must be gas tight." In the context presented,
it appears that only water tightness is being required. Is the material being specified going to
provide a gas tight seal? Please specify that the seals must be gas tight seals.
KHA: Complied.
68. Number 13: The type and thickness of the Ductile Iron Pipe does not appear to be specified. Please
provide such.
KHA: Complied.
69. Number 15: In comment number 3, you reference the Engineer; in this comment, you reference the
Owner. Please be consistent.
Comments on 95% Cypress Waters Lift Station and Force Main Submittal.
Page 11 of 33
KHA: Complied.
70. Number 18(b): The units on the thickness of the coatings has been left off. Please correct.
KHA: Complied.
71. Number 19: I believe that Raven Lining Systems is incorrectly spelled. (The "L" in lining and the "S"
in system, should be capitalized.)
KHA: Complied.
72. I do not understand something and I hope you can help me with it: I see that there is an 8" Quick
Connect on the upstream side of the Valve Vault. The Valve Vault contains Valves, which control the
flow of fluid in the force main. Why is the emergency vacuum nozzle at this location? I have
thought the emergency vacuum should be close to the wet -well and before a valve. Please explain
this design.
KHA: This was explained at the 95% review meeting.
73. Again, I do not understand something: Under the Base Slab, there is a note calling for a 5" thick
Mud Slab. What does this mean? Is this Bentonite — Flowable — 4F? Do you need more
specifications than simply Mud? Water Content, Atterberg Limit, etc?
KHA: This was explained at the 95% review meeting.
74. I am a little concerned about this design in that it does not appear to be concerned with the highly
plastic soil in the area. I will need to see some structural calculations concerning how the
foundation, walls, and pavement slabs will be kept from potential shrink and heave.
KHA: The structural design was based on findings from the geotechnical report. KHA will provide
DWU with the report for their records.
75. TCEQ; Chapter 217, Item 217.60. Lift Station, Wet Well, and Dry Well Designs (f) Hoisting Equipment,
indicates that a wet -well will have permanent hoisting equipment or be assessable to portable
hoisting equipment for removal of pumps, motors, etc. Because the finished elevation of the top of
the lift station is in doubt, the finished elevation may be as much as 1.3 feet above the ground
(515.00 — 513.70), which means that a hoist mounted on the back of a truck would not be able to
reach the wet -well. Please provide a permanent hoist to remove the pumps and motors.
KHA: Per conversation with Jim Henry on 9/20/11, a permanent hoist will not be necessary.
76. On the Upper left side of the wet -well detail there is an indication of Ductile Iron Pipe and Stainless
steel pipe; however, it is somewhat ambiguous where the transition actually occurs. Additionally,
there is no indication as to how this transition is to occur. Please provide an indication where,
exactly, the transition is to occur and how, exactly, this transition is to be made (welded, pipe- fitted
or some other method. What about dissimilar metals — General Note number 8 demands an
"installation kit" but it is not clear where an installation kit will be used. Please clear this up.
KHA: Complied.
Page C -08
77. I see a line that is delimiting the "Existing Lake Water Surface "; however, neither the FEMA map
number nor the normal pool water surface is identified. Please show these. Additionally, please
show the 100 -year water surface elevation and the FEMA Map Numbers.
KHA: Complied.
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 12 of 33
78. I don't know what "potential lake water surface" means. Perhaps "planed ", "purposed ", or "future"
are better terms?
KHA: Complied.
79. There are, apparently, what are supposed to be easements shown near Phase 1. Pleas indicate what
these lines represent.
KHA: Complied.
80. A 300 scale is a rather odd scale. Because it is so odd, please indicate in numbers what the scale on
this map is (continue to include the Bar Scale).
KHA: Complied.
Page C -09
81. Section 3 — Meter Vault — Left Section: Reference is made to Structural Notes. Where are the
Structural Notes? Please include a reference document and page number.
KHA: Complied.
82. Section 6 — Odor Control: Are Item 4 and Item 8 the same part? If they are, why call them out
differently?
KHA: Items will be combined.
83. Section 9 — Removable Bollard: Make the 12" bolts being set into the concrete Type 316 Stainless
Steel rather than type 304.
KHA: Complied.
Page C -10
Structural Notes:
84. Number 1: This item sates that the structural design is in accordance with the 2006 Edition of the
International Building Code. The City of Dallas' Website
(http: / /dallascityhall.com /building inspection /plumbing mechanical.html) shows amendments to
the following:
a. 2006 International Residential Code
b. 2006 International Plumbing Code
c. 2006 International Fuel Gas Code
d. 2006 International Mechanical Code
e. 2006 International Energy Code
However, there is no mention (that I can find) of the 2006 International Building Code or any
amendments thereto.
On the International Code Council's website (the authors and guiding body for the International
Building Code) located here: http: / /www.iccsafe.org/ Store /Pages /20121- Codes.aspx ?r= 2012icodes.
Only the 2009 and 2012 Versions of the International Building Code are available — meaning that
the 2006 version, apparently, has been retired. Has this project been designed to appropriate
standards? Is there a City of Dallas requirement to use the 2006 version of the International
Building Code?
Comments on 95% Cypress Waters Lift Station and Force Main Submittal.
Page 13 of 33
According to the City of Dallas Charter, Chapter 52, Administrative Procedures for the Construction
Codes (Current through January 2011)
( http : / /www.dallascityhall.com /pdf/ Building /Chapter52Booklet.pdf), page 1, the Dallas Building
Code is the code that governs the construction of buildings. Which is correct, the Dallas Building
Code (chapter 53 of the Dallas City Code) or the International Building Code?
KHA: According to The City of Dallas' website
(http: / /dallascityhall.com/ building_ inspection /construction_codes.html), the 2006 International
Building Code with Dallas Amendments is the adopted code. Will revise note accordingly.
85. Number 2: This item states "Backfill shall be identified on the plans." On this page, section 6
shows "Select Fill" and referrers back to Structural Note #21, which uses several "should" words.
What, in this context, does the word "should" mean? (It is an unenforceable word and should not
be used in contracts.)
KHA: Will revise to use "Shall ".
86. Number 3: "... in accordance with the Technical Specifications ". Which specific Technical
Specification is being referenced?
KHA: Will revise to be more specific.
87. Number 4: Given the potentially extreme nature of the insitu soil, should we say something more
than this? Perhaps, we should specify lift heights, density requirements, moisture requirements,
etc? (Similar to Item #21)? Should a specific bracing be used?
KHA: The backfill requirements are identified in the NCTCOG Specification and the geotechnical
report. The Contractor will be required to submit a trench safety plan that identifies the
bracing.
88. Number 11: I thought that Fly Ash is generally a substitute for Cement, not Concrete. Please
correct.
KHA: Complied.
89. Number 21: See comment on Number 2 Above.
KHA: Complied.
90. Section #1: Overlaps of the steel are shown. Please indicate the minimum lengths of the overlaps.
If a chart is required for various conditions, please provide.
KHA: The overlaps do not provide structural support. They are shown for constructability. The
slab can be constructed without the overlaps.
91. Section 31: A Water Stop is being requested; however, I do not see a detail or callout as to what
water stop is required or how it should be included. Please provide.
KHA: A note has been added to read, "All Water Stops Shall be 6" Heavy Duty PVC (Minimum
3/8" Thickness) Or Sikaswell -S Sealant (20 MM Min.) Unless Otherwise Noted."
92. Section #2: The note states: "Opening Diameter shall be Opening Diameter plus Class "B" lap
splice." Please indicate what this distance is.
KHA: This distance will depend on the size of the reinforcement and the opening diameter. A
Class "B" lap splice shall be 1.3 x Development Length (Id) in accordance with ACI 318 -05
Section 12.15.
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 14 of 33
93. Section #2: The note states: "For opening diameters of Tess than 12 ", Provide No. 6 X (Opening
Diameter = 4' -0 "). I do not understand what this is calling out. Please explain.
KHA: The contractor shall provide a No. 6 bar, and the length of the bar shall be the opening
diameter plus four (4) feet
94. Section #3: Same comments as for Section #2.
KHA: See above.
95. Section #4: Note at bottom states "Adjustable Pipe Roll Support Grinnel Fig. 171 Or Equal (Typ).
Provide in stainless steel..." This should read: Adjustable Pipe Roll Support Grinnel Fig. 171 Or
Equal (Typ). Provide in type 316 stainless steel..."
KHA: Complied.
96. Section #4: Should the type of epoxy be specified?
KHA: A note has been added to read, "Epoxy Shall Be Manufactured By Sika Or Approved Equal.
Installation Of Epoxy Shall Be In Accordance With Manufacture's Recommendation ".
97. Section 6: Not to be overly meticulous, but is there no soil or concrete on the outside of the
beam wall? How high up the outer beam is the soil (or concrete, depending on where it is to be
placed) to be backfilled? Is the soil or concrete to be sloped for drainage from the Exterior Beam?
KHA: The slab will be 6" above grade.
Sheet Unknown — Site Plan E01
98. Please number the sheet in an appropriate manner.
KHA: Complied.
99. This site plan is different from the Civil Plan. Which is correct? Specifically, Item 05 (detailed on
Sheet E -08) is shown on this plan and not shown in the Civil Drawings. Please show as
appropriate.
KHA: Complied.
Sheet Unknown — One Line Diagram — E02
100. Please number the sheet in an appropriate manner.
KHA: Complied.
101. Item number 2008, in the wiring column appears to be missing a " # ". Please correct.
KHA: Complied.
102. No additional comments at this time; however, the ability to comment in the future is reserved.
103. Item Number 3007 refers to SBC Telephone Line. Is this in reference to Southwestern Bell
Company Telephone Line — which no longer exists? Who will be providing telephone service?
KHA: Will revise to be AT &T.
Sheet Unknown — Control Schematics 1— E03
104. Please number the sheet in an appropriate manner.
Comments on 95% Cypress Waters Lift Station and Force Main Submittal.
Page 15 of 33
KHA: Complied.
105. No additional comments at this time; however, the ability to comment in the future is reserved.
Sheet Unknown — Control Schematics II — E04
106. Please number the sheet in an appropriate manner.
KHA: Complied.
107. No additional comments at this time; however, the ability to comment in the future is reserved.
Sheet Unknown — Electrical Details I — E05
108. Please number the sheet in an appropriate manner.
KHA: Complied.
109. Neither the Civil Details nor this detail has enough information to construct the slab for the
equipment stand. Please provide enough information to construct the Electrical Panel
foundations (steel, dimensions, etc).
KHA: Detailed information was added to Sheet C -11.
110. How will the electrical wires penetrate the foundation slab? Will these be replaceable? Will there
be long -sweep ells under the foundation? Will all the wires be combined in a conduit that leads to
the pump controllers?
KHA: The prefabricated Romtec shelter and slab details the openings for the conduit. The
Contractor shall submit shop drawings for approval.
111. How will the rain shield (roof) be supported?
KHA: Refer to Sheet C -11.
112. No additional comments at this time; however, the ability to comment in the future is reserved.
Sheet Unknown — Electrical Details II — E06
113. Please number the sheet in an appropriate manner.
KHA: Complied.
114. All bolts, tie -down straps, etc, not located in wet -well shall be either type 316 stainless steel or
hot - dipped galvanized. Please be consistent with the callouts — in some places stainless steel is
STN STL, or SST. Please correct.
KHA: Complied.
115. Section 5: Notes — Number 2 — Bolts to be type 316 Stainless Steel, not 306.
KHA: Complied.
116. Section 5: Notes — Number 4 — this will be a "wet" location, should the "Damp" location type
material be allowed?
KHA: The damp condition has been removed.
117. Detail 8: What does the term "N.O. Contacts Close on High Water" mean? (What is N.O. ?)
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 16 of 33
KHA: This means "normally open ".
118. Detail 8: A Mounting bracket is called out, but there are no materials or methods of mounting the
bracket. Please call out.
KHA: Conduit clamp was added to the detai.
Sheet Unknown — Electrical Details III — E07
119. Please number the sheet in an appropriate manner.
KHA: Complied.
120. Section 04: This section is titled "Valve Wall Mount Incandescent Fixture ". How is this title
relevant to the detail shown? I do not see an Incandescent Fixture shown.
KHA: This has been revised with the appropriate title.
121. General: All lights should be converted to Compact Florescent or some other light source because
by the end of 2012, incandescent lamps will no longer be available.
KHA: Complied.
122. Section 04: On the top of the wet -well is a notation indicating FFE= 515.00. I assume this to mean
Finish Floor Elevation equals 515.00. In several other locations throughout this plan set and in the
Design Report, the finish elevation is shown to be 513.70. Which is it? Please correct in all
locations.
KHA: Complied.
123. Section 04: I am a little confused by the elevation locations of the control switches. According to
the Design Report, these switches should be placed at elevation 486.00 (Pump On), 482.00 (Pump
Off), and an alarm at 489.00. The elevations shown on this section appear to be at 481.20 (FSL2),
481.70 (FSL1), and 488.00 (FSH). Additionally, in the chart to the left of the section there are other
elevations shown. Why is there a difference?
KHA: The table now matches the design report.
124. Section 04: According to the chart that is left of the section, there is supposed to be a 15" influent
line coming at elevation 490.00. The section does not have this elevation shown. Please correct.
KHA: Complied.
125. Section 04: In the chart to the left of the Section detail, there are 8 control sensors and I only
count 3 control sensors in the detail. How is this lift station going to be controlled?
KHA: The level transducer accounts for 5 of the control points.
126. Section 04: On the left side at the bottom is a note indicating "BASE SLAB, REF: STRUCTURAL
SHEETS FOR DETAILS. Because there appears to be some discrepancy, please place the drawing
and section number here.
KHA: Any structural references have been removed.
127. Section 04: This detail is calling out a 12" Crushed stone beneath slab. Drawing C -07 is calling out
5" Mud Slab. Which is it?
KHA: See above.
Comments on 95% Cypress Waters Lift Station and Force Main Submittal.
Page 17 of 33
128. Section 05: Apparently, the footing of the Pole Mount is to include #6 rebar; however, there is no
spacing associated with the longitudinal rebar. Please show the spacing.
KHA: More information has been added to this detail.
Sheet Unknown — Electrical Details — E08
129. Please number the sheet in an appropriate manner.
KHA: Complied.
130. On the 150 KVA Transformer pad, it appears that the piers are not going to be tied to the pad. Is
this the design? With as much potential for shrink swell as this area presents, the steel from the
piers to the pad should be tied to the slab. Please show calculations indicating this is not required.
KHA: This detail will be revised to show the steel from the piers being tied to the slab.
131. Section 04: The dimensions on the Sun Shade of the Meter are rather confusing. Please place
actual dimensions on the sun shade. (Particularly the "M" dimension. It appears that the meter is
as deep as it is wide and the detail is not telling how far the shade is to extend to provide the
shade for the meter.)
KHA: Complied.
132. Is the Meter not located inside a closed and locked box? What about security? How long will the
equipment last if it is not is a closed and locked box?
KHA: Note 3 describes the enclosure as lockable.
133. Section 02: Notes #2 — What is a "Hard Surface "? How hard is a "hard surface "? Perhaps this
should say "bedrock ", or something like that?
KHA: This has been revised to say "rock or other hard surface ".
134. Section 02: Notes #4: Please state the exact size of rebar that is required.
KHA: Complied.
135. Section 05: There is a note stating: "1/2" x 10" x10" Base Plate with four %2" Expansion anchor
bolts, Levelling nuts and washers (Typ). "Levelling" is misspelled; please correct. Indicate the
bolts, washers and nuts are to be galvanized or 316 stainless steel.
KHA: Complied.
136. Section 05: In the detail, there is a note stating "Ref: Civil for vault Detail ". Please indicate what
sheet and section.
KHA: Complied.
Sheet 1 -01
137. The meter shown on the Electrical Site plan E -01 is not shown here. Please show.
KHA: Complied.
138. Shouldn't the diameters of main corner posts and gate posts be specified?
KHA: Complied.
139. What is the diameter of the other posts?
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 18 of 33
KHA: A note will be added that all fence posts shall be 4" square.
140. What is the exterior treatment of the fence? Will the fence be galvanized, powder - coated,
painted, or something else? Please specify.
KHA: Fence will be power- coated black. This will be added to the notes.
141. There is a note indicating "Fence Sections Should be Evenly Stepped at Post Locations ". Please
include wording indicating that the minimum height of the fence in all locations will be 8 feet. (If
the contractor steps the fence, then the short side will continue to be a minimum of 8 feet. The
tall side could be taller than 8 feet.) Please change the word "should" to the word "shall ".
KHA: Complied.
142. There is a 150 KVA electric line entering the lift station area. The fence is to cross the 150 KV line
and there is no note indicating the contractor should be careful to avoid the 150 KVA line. Please
include such a note.
KHA: Complied.
143. I do not see a maximum spacing for the fence pickets. Please include a maximum spacing on the
fence pickets.
KHA: Complied.
144. Are the fence "runners" welded or bolted to the pickets? Please indicate which.
KHA: A note has been added that all connections shall be welded.
Sheet 1 -02
145. The meter shown on the Electrical Site plan E -01 is not shown here. Please show.
KHA: Complied.
146. I note that the interior of the Lift Station (the area not under concrete and inside the fence) has
no landscape treatment specified. I thought the gravel / flex bas was going to be only in, around,
and on top of the wet -well and the valve vault. I thought the area around the transformer and
generator would be grass. Is this not the case?
KHA: As specified on Sheet C -06, everything inside the fence will be flex base unless otherwise
noted.
147. (new) I note that the mature shrub line will be covering the meter vault location, making it
difficult to open the doors to the meter vault. Please specify vegetation that will not be covering
up the vault lid.
KHA: This is a maintenance issue. Trees can be trimmed back if necessary to expose the meter
vault.
148. No additional comments at this time; however, the ability to comment in the future is reserved.
General Comments
149. Next time a 95% set of plans is submitted, the Quality Control / Quality Assurance check should
have been done. These plans, at best, are at about 80%.
Comments on 95% Cypress Waters Lift Station and Force Main Submittal.
Page 19 of 33
KHA: Complied.
150. I am very concerned about the structural components of this design. It appears that quite a bit of
the structural design is missing. Perhaps I missed it, but if these designs are to be precast on the
vertical, and the slab is to be cast in place, what and where are the designs of the tops of the wet -
well and the meter vault?
KHA: The Contractor will submit shop drawings for these items which will be reviewed by the
Engineer.
151. I am very concerned about the calculations concerning the shrink and swell potential of the soil.
Please provide an Engineer's Report indicating that the structures have been designed to
withstand the forces involved with the type of soil in the area. Please provide calculations and an
engineer's seal.
KHA: The geotechnical report has been provided.
152. Be sure to follow ALL DWU standards - Both Drafting and Design. Show slopes on all pipe
segments (See Exhibit K2).
KHA: Complied.
153. I do not see a method by which the flow to the lift station may be cut off.
KHA: The manhole on the influent line can be plugged in order to cut off the flow.
154. I do not see a detail of the foundation or pad for the Odor Control System. Neither do I see a
control panel or electrical equipment stand for the Odor Control. Am I missing something?
KHA: The Contractor shall submit shop drawings for the slab. This note has been added to the
detail for the odor control.
Comments Regarding Cypress Waters Phase I Lift Station, Technical Specifications
Division 13 — Special Construction and Division 16 — Electrical
Cover Page: No Comments at this time.
Contents: No Comments at this time.
Section 13100 — Sanitary Sewer Lift Station
Part 1— General Specifications
102 Reference Standards
Various Standards and Controlling organizations are listed in this specification that are not listed
here. Please list the agencies that are referenced by initials in this specification.
KHA: The referenced organizations and agencies are now listed in this section of the specification.
1.03 Submittals
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 20 of 33
(1) To whom and when will the Contractor submit these materials?
KHA: Division 1 of the specifications covers the submittal process in detail.
Part 2 — Product
2.01— Materials
A. Pumps
2. Add: "... no less than two type 316 stainless steel guide bars as specified in the Construction
Drawings, extending from ... "
KHA: Complied.
4. Mix Flush Valve
Second Paragraph: word "greasy" is used, should probably be "grease ".
KHA: Complied.
Third Paragraph: I do not see in the plans where a Mix Flush Valve is going to be. Where is this
valve?
KHA: Refer to Sheet C -07 of the plans. It is identified as Item "Q" on the Equipment /Fitting List.
B. Motor
2. "The motor shall be designed for continuous operation in up to 40 °C". 40 °C converts to 104 °F,
which may be a bit low considering the rather warm summer we are having. What would the
manufacturer think about specifying 115 °F (46 °C)?
KHA: This has been confirmed with the pump manufacturer and modified as requested.
3. "The motor shall be capable of continuous submergence underwater to a depth of 65 feet or
greater." The wet -well appears to be 35 feet deep (515 -480). A factor of safety of 2 would require
70 feet. Please specify 70 feet or greater.
KHA: Complied.
C. Bearings
"The minimum L10 bearing life shall be 50,000 hours ... ". 50,000 hours is approximately 5.7 years of
continuous operation. Assuming a 50% duty cycle, this is approximately 11.4 years, which seems
reasonable to me. Does anybody have a concern about this time frame?
KHA: No concerns have been mentioned.
H. Wet Well Piping
Comments on 95% Cypress Waters Lift Station and Force Main Submittal.
Page 21 of 33
"Said Supports and braces shall be 316 stainless steel and sized to withstand anticipated forces." The
job of the engineer is to size these braces. The plans do not show the required sizes. Please indicate
the size, locations, and quantities of the braces.
KHA: This statement has been deleted from the specification. The location and quantity of the
braces are identified in Detail 2 / Sheet C -07 and the Equipment /Fitting List on Sheet C -07. A
detail of the brace is provided on Detail 4 / Sheet C -10.
I. Ductile Iron Pipe
"Ductile Iron Pipe, fittings, and joints shall conform to the requirements specified in the Plans." I do
not find any specifications in the plans indicating what type and thickness of Ductile Iron Pipe is
supposed to be. Please provide such.
KHA: The General Notes on Sheet C -07 have been updated to specify the ductile iron pipe and
fittings requirements.
K. Plug Valves
I am not familiar with what a Plug Valve is. I do not believe these are approved by DWU for use in
any system. Further, in situations like this, Plug valves provide no throttling abilities, are not well
thought of in the industry, and appear to be poorly suited in this application. Please provide
justification for the use of a Plug Valve.
KHA: Eccentric plug valves are used frequently in wastewater applications, such as lift stations and
wastewater treatment plants, because of their ability to provide a tight shutoff in applications
that contain high concentrations of solid material (they keep solids out of the seating area). They
are often times preferred over gate valves for municipal wastewater infrastructure for their
shutoff ability and because they tend to have a longer operating life in these applications. They
have been used for prior DWU lift stations as well as at DWU treatment facilities.
N. Warranty
In this paragraph, there is a discussion of a one -year warranty. Since it is likely that the lift station
will be completed in advance of the apartments it is to serve, when will the warranty begin?
KHA: This section of the specification has been revised to specify the following:
• The warranty shall be provided by the Developer.
• The warranty shall be for a period of 1 year.
• The warranty is to begin on the date of substantial completion.
• The project shall be considered substantially complete after acceptance by the City, which
will include 30 -days of successful operation by the Contractor as a proof of suitability.
Part 3
3.03 Testing
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 22 of 33
This paragraph deals with "Site testing ". In the paragraph, there is a call for tests to be completed by
the manufacturer; however, no specific tests are mentioned. What specific tests should be
performed? Are there ASTM type tests on this type of equipment? How will we know if the tests are
successful or fail? In other words, I think this needs a little more detail.
Because this lift station is likely to be completed before there are any occupants in the apartments to
be serviced by the Lift Station, how will acceptable tests be completed?
KHA: This section of the specification now includes an additional offsite Hydraulic Institute test to
be performed by the pump manufacturer. The specifications now identify that the test results
shall be provided to the Owner. Water from the proposed hose bib will likely need to be utilized
in order to fill the wet well for testing if the inflow is not sufficient at the time of testing.
Section 13200 — ODOR CONTROL EQUIPMENT
Part I - GENERAL
1.07 WARRANTY
The warranty for this equipment is for two years. Why is the lift station warranty for one -year?
How will the OWNER enforce a two -year warranty when the Contractor will be out of warranty?
Does the warranty cover the expendable parts (Odor control media)?
KHA: This section of the specification has been revised to specify the following:
• The warranty shall be provided by the Developer.
• The warranty shall be for a period of 1 year.
• The warranty is to begin on the date of substantial completion.
• The project shall be considered substantially complete after acceptance by the City, which
will include 30 -days of successful operation by the Contractor as a proof of suitability.
The warranty would not include the chemical media. This is now identified in the specification.
Part 2 - PRODUCTS
2.01 ACCEPTABLE MANUFACTURERS
Mention is made that the Engineer is able to approve materials. I think the OWNER should approve
the Materials.
KHA: Complied.
2.02 General
A. General
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 23 of 33
1. Mention is made that the Engineer is able to approve materials. I think the OWNER should approve
the Materials.
KHA: Complied.
B. Drums
10. The engineer should specify whether or not a grounding rod is necessary. Is one?
KHA: Grounding rods are shown on the Electrical Site Plan sheet E -05. This section will be revised to
say that grounding rods are shown on the plans.
C. Blower Section
1. "30 cfm" means that it will take 125 minutes (a little over 2 hours) to exchange the air in the lift
station. Is this appropriate? According to TCEQ 217.60 Lift Station, Wet Well and Dry Well Designs, (d)
Lift Station Ventilation, (2) Mechanical Ventilation, (B) Wet Wells (ii) "The ventilation equipment must
have a minimum capacity of 12 air exchanges per hour and be constructed of corrosion resistant
material." I am concerned this TCEQ requirement is not being met.
KHA: After coordinating with Purafil, the blower air flow rate has been updated to 320 -608 cfm.
4. "Motor shall be prewired with a 6 -foot grounded power cord" — Will a covered outdoor wall outlet
be provided within 5 feet of the motor? On Site Plan — E01 and Site Plan - E02, reference is made to
the following power leads:
1005 — Pump Starter Panel Pump #1 J -Box
1006 — Pump Starter Panel Pump #2 J -Box
1007 — Pump Starter Panel Pump #3 J -Box
2004— Wet Well Control Panel Motor Rated Switch (1HP)
3001 — Wet Well Control Panel Wet Well Instrument J -Box
3006 — Wet Well Control Panel Meter Vault Level Float
No reference is made to the Odor Control Panel wiring, although a line, possibly indicating the need
for power to the Odor Control, is shown. It is also possible that lead 2004 is intended to supply the
Odor Control system; however, it does not appear to be clear on the plans. Please make the
specifications and the Plans match.
KHA: The odor control will be wired with a switch so that the blower can be turned off to perform
maintenance. This will be reflected on the electrical plans.
Part 2 - EXECUTION
3.01 INSTALLATION
B. In this paragraph is mention that the Manufacturer's Factory Representative will write a letter
"outlining all installation and startup procedures." This letter shall be included in a separate, and
distinctly marked, section of the Operations and Maintenance Manual. Additionally, the Operations and
Maintenance Manual shall be provided in both paper and electronic forms — Microsoft Word (current
version), or PDF (Portable Document Format — Current Version) are acceptable.
KHA: Complied.
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 24 of 33
SECTION 13300 — TRANSIT TIME FLOW METER
PART 1— GENERAL
1.02 Quality Assurance: In this paragraph, it is mentioned that the manufacturer "Shall be responsible
for the adequacy and compatibility of all components including transducer ". Included shall be the
following sentence: "The term 'adequacy and compatibility' shall mean not only the adequacy and
compatibility of the equipment within the lift station, but also the adequacy and compatibility of the
new equipment in regards to working with the existing Dallas Water Utilities SCADA systems.
KHA: Complied.
1.03 Environmental Conditions: Please change the operating temperatures from between 10 °F and
105 °F to 10 °F and 115 °F. Please change the water temperatures from between 50 °F and 80 °F to 50 °F
and 90 °F.
KHA: Complied.
1.04 Submittals:
B. Submittals required to final walk through:
1. This comment should read "Three copies of the Operations and Maintenance Manual in paper
format and one copy of the Operations and Maintenance Manual in Microsoft Word (Latest Version)
or Searchable PDF (Latest Version) format, will be required."
KHA: Complied.
1.05 Shipping Instructions
E. Storage and Protection:
A. What does the term "Special Care" mean? Please define what the term "Special Care" means or use a
term that has specific meaning.
KHA: Complied.
1.06 Warranty
A. The Warranty period is for two years, but the Contractor has only a one -year warranty commitment.
Who will the warranty be in favor of and how will that person seek satisfaction? If the warranty is in
favor of the Contractor (the actual purchaser of the equipment) then how will the City seek satisfaction
if there should be a concern during the period from the end of year =one to the end of the warranty?
The warranty is to begin on the date of substantial completion. It is entirely likely that the lift station will
not be used for several months (maybe longer) after the date of substantial completion. Please include
wording indicating that the warranty period will begin after acceptance by the City, which may include
30 -days of successful operation by the Contractor as a proof of suitability.
KHA: This section of the specification has been revised to specify the following:
• The warranty shall be provided by the Developer.
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 25 of 33
• The warranty shall be for a period of 1 year.
• The warranty is to begin on the date of substantial completion.
• The project shall be considered substantially complete after acceptance by the City, which
will include 30 -days of successful operation by the Contractor as a proof of suitability.
PART 2 — PRODUCTS
2.01 Transit Flow Meter:
C. The range of operation up to 50 fps within a pipe seems rather excessive. It is unlikely that the
effluent in the pipe will ever exceed 20 fps. Is it typical for this specification to be 50 fps? If so, OK; but I
would rather a range between 0 and 20 fps, with the lower end of the velocity scale be more accurate.
KHA: The referenced range of velocity is identified in order to provide a benchmark for the accuracy
and performance of the flow meter. The flow meter is accurate to +- 0.5% of full velocity scale.
G. This item shall read: "Programming software shall be included with the flow meter, shall be
Microsoft Windows compatible, and shall work with the existing Dallas Water Utilities SCADA Systems."
•
KHA: Complied.
PART 3 - EXECUTION
3.01 Installation
B. In this paragraph is mention that the Manufacturer's Factory Representative will write a letter
"outlining all installation and startup procedures." This letter shall be included in a separate, and
distinctly marked, section of the Operations and Maintenance Manual. Additionally, the Operations and
Maintenance Manual shall be provided in both paper and electronic forms — Microsoft Word (current
version), or PDF (Portable Document Format — Current Version) are acceptable.
KHA: Complied.
SECTION 16010 — ELECTRICAL PROVISIONS
PART 1— GENERAL
1.1 General Conditions
C. Who shall "Furnish all work, labor... "?
KHA: Revised to state that "Contractor shall furnish..."
D. Who shall "Be responsible for visiting the site and ... "?
KHA: Removed from specification.
E. Please make this sentence read: "It is the intent of the Contract Documents, that upon completion of
the electrical work, the entire system shall be in a finished, working condition, and integrated into the
Dallas Water Utilities SCADA and Control system."
KHA: Complied.
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 26 of 33
I. Mention of "Division 16" is made. What is Division 16? If this is not referenced, please correct.
KHA: Division 16 is the electrical specifications as noted on the cover sheet and index.
1.2 Permits and Codes
B. Please make this sentence read: "The minimum requirements of the electrical system installation
shall conform to the latest edition of the National Electrical Code, as amended buy Chapter 56 of the
Dallas City Code, as well as applicable State and Local Codes."
KHA: Complied.
PART 2 - PRODUCTS
2.2 Shop Drawings and Submittals
E. "Review of submittals or shop drawings shall not remove the responsibility for furnishing materials or
equipment or proper dimensions, quantity and quality, nor will such review remove the responsibility for
error in the shop drawings or submittals." Who own this responsibility? Please state who is accepting
this responsibility.
F. "Assume all costs and liabilities which may result..." Who will assume all costs and ...?
G. Who will "report this information for each submittal ..." and to whom will they report it?
I. "Shop drawings and submittals will be returned and unchecked if the specific..." What does this
mean? How can something be unchecked?
J. "When requested, furnish samples of materials for acceptance review." Who will do this?
"... if it is found that the installed item is not equal, then replace all such items with ..." Who will replace
all such items?
KHA: All language removed and a reference to section 01340 was added.
2.3 Acceptance and Substitutions
A. "All manufacturers are a basis as a standard of quality ..." Is this worded correctly?
The OWNER (DWU) will make the product substitution decisions, not the engineer.
Note: The grammar and the definitions of whose responsibility each function are confused and difficult
to understand; this entire specification section must be rewritten. Please correct and resubmit.
KHA: Section 2.3 removed.
SECTION 16110 - RACEWAYS
PART 1- GENERAL
1.1 Scope
B. Include "National Electric Code, as amended by the latest edition of the City of Dallas, Chapter 56 of
the City Charter ".
KHA: Complied.
PART 2 — CONDUIT FITTINGS
2.4 Pull and Junction Boxes
A. Please furnish all metal enclosures in corrosive areas as NEMA 4X 316 Stainless Steel.
KHA: Complied.
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 27 of 33
B. Please furnish all metal enclosures in corrosive areas as NEMA 4X 316 Stainless Steel.
KHA: Complied.
C. All Hardware shall be type 316 Stainless Steel.
KHA: Complied.
2.6 — Supporting Devices
B. Clamp nuts for use with channels shall be grade 316 stainless steel.
KHA: Complied.
C. Where indicated furnish grade 316 stainless steel slotted channel members ...
KHA: Complied.
F.... lockwashers and bolts for use with channels shall be type 316 stainless steel ...
KHA: Complied.
H. Hanger rod shall be 3/8" minimum diameter, type 316 stainless steel all thread.
KHA: Complied.
M. Conduit "U" bolts shall be hot galvanized steel with 316 stainless hex -head bolts.
KHA: Complied.
SECTION 16120 — WIRE AND CABLE
Part 3 — EXECUTION
3.1 Power and Control Cable
G. I thought they have much better ways of doing this now -a -days, including placing the entire splice in a
plastic cap of silicone. Why is this old fashioned method of wrapping tape around the splice being used?
KHA: This is the method that still in use.
H. See above comment.
KHA: This is the method that still in use.
N. Add: "Nylon tie straps shall be trimmed of excess materials and tie straps will present a neat and
orderly appearance."
KHA: Complied.
3.3 Ground Wiring
A "... Comply with Article 250 of the N.E.C., as amended by the latest edition of Chapter 56 of the City of
Dallas City Code, except where ..."
KHA: Complied.
SECTION 16199 - MISCELLANEOUS
PART 2 - PRODUCTS
2.4 EQUIPMENT STANDS
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 28 of 33
B. "Enclosed circuit breaker enclosures shall be NEMA 4X type 316 stainless steel ..."
KHA: Complied.
SECTION 16210 — ELECTRICAL UTILITY SERVICE
No comments at this time.
SECTION 16220 — STANDBY GENERATOR SET
PART 1— GENERAL
1.1 Scope
A. "Furnish to the City... ?" Is this correct? Perhaps: "Furnish to the site ... "?
KHA: Complied.
1.4 SUBMITTALS AND SHOP DRAWINGS
D. To whom does the Contractor furnish the submittals?
KHA: Division 1 of the specifications covers the submittal process in detail.
PART 2 — PRODUCTS
2.7 WEATHER ENCLOSURE
D. Please change the ambient of 40 °C to 46 °C (115 °F).
KHA: Complied.
H. "Locks must be keyed alike" and to the City of Dallas Standards.
KHA: Complied.
N. Incandescent type lights are being obsoleted. Please use some other type of Tight and light fixture.
KHA: Complied.
2.8 CONTROLS
KHA: The controls section is out - dated and has been removed from the specifications.
Page 12 of this Specification — why is there an almost empty page? Please remove the additional space.
1. System Programming
2. "... using an IBM Compatible personal computer ". What does this mean? IBM no longer makes
personal computers so this does not have a meaning. Perhaps an "Intel processor based portable
computer running a current Windows based operating system environment "?
J. Communications
Add item: 5. The system must be capable of being remotely monitored and controlled by use of the
existing City of Dallas SCADA system if requested.
K. Communications & Personal Computer Software
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 29 of 33
1. These operating system are very much out of date. Please update to include modern operating
systems. See comment I. System Programming; 2. above.
7. Is this appropriate? Universal Serial Buss (USB) Connectors carry their own power. The USB is far
more common than old RS -232 or RS -485 connectors.
KHA: Revised entire section.
PART 3 — EXECUTION
3.2 Owner's Manuals
A. Add: "These must be supplied in a printed form and one electronic version in Microsoft Word (Latest
Version) or Searchable PDF (Latest Version) format."
KHA: Complied.
3.7 SUBMITTALS
Is this the same as Item 3.2? If so why repeat. If not, include an electronic version (Word or PDF) of the
materials.
KHA: Complied.
Section 16230 — Automatic Transfer Switch
Part 2 — PRODUCTS
2.01 AUTOMATIC TRANSFER SWITCH
C. "The automatic transfer with bypass switch (ATS) shall consist of an inherently double throw power
transfer..." Is "inherently" correct in this sentence?
KHA: Inherently has been removed.
2.05 MONITORING, PROGRAMMING, AND COMMUNICATIONS CAPABILITY
KHA: This section is out -dated and has been removed from the specifications.
B. Personal Computer Set -up / Monitoring Software
These specifications are ancient. I doubt that a supplier will be able to find these products. IBM no
longer makes personal computers so this does not have a meaning. Perhaps an "Intel processor based
portable computer running a current Windows based operating system environment "? Additionally, RS-
232 Communications format have been almost completely replaced by Universal Serial Bus (USB) ports.
Please update this to be a little more modern.
Add 5. Event monitoring shall be available over an Ethernet based Internet connection.
PART 3 — EXECUTION
3.03 WARRANTY & MAINTENANCE
A. What is a "basic extended warranty"? Please be a little more specific regarding what a basic extended
warranty is.
KHA: This has been revised to say a "one year extended warranty ".
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 30 of 33
3.04 OPERATION AND MAINTENANCE MANUALS
B. Add: "6. Operations and Maintenance Manuals shall be supplied in a printed form and one electronic
version in Microsoft Word (Latest Version) or Searchable PDF (Latest Version) format."
KHA: Complied.
3.07 TRAINING
E. Grammar in this paragraph is poor. Please correct.
KHA: Section revised.
SECTION 16310 — WET WELL CONTROL PANEL
PART 2 — PRODUCTS
2.03 COMPONENTS
B. There is an extra "period" (.) in this paragraph. Please remove it.
KHA: Complied.
SECTION 16330 — PUMP STARTER PANEL
PART 1— GENERAL
1.01 SCOPE
D. This item references "the Civil Specification, Submersible Pumps." Where is this? I do think I have
reviewed this specification, yet. Please provide.
KHA: The pumps are specified in section 13100.
F. Add: "... NEC, as amended by Chapter 56 of the City of Dallas City Code, ..."
KHA: Complied.
1.02 SUBMITTAL AND SHOP DRAWINGS
C. This section requires that manufacturer information be submitted. To whom should this information
be submitted and when?
KHA: Division 1 of the specifications covers the submittals process in detail.
PART 2 — PRODUCTS
2.03 COMPONENTS
C. In previous specifications, I believe a manufacturer other than Square D was specified for circuit
breakers and electric boxes. Please make all circuit breakers and boxes the same manufacturer.
KHA: Electrical engineer to review.
Reference is made to "on the Drawings ". Please be specific as to which drawings and details are being
referenced.
KHA: Complied,
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 31 of 33
2.04 DRY TYPE TRANSFORMER
A. Reference is made to "as shown on the Drawings ..." Please be specific as to which drawings and
details are being specified.
KHA: Complied.
D. reference is made to 304 Stainless Steel. Please change to type 316 Stainless Steel.
KHA: Complied.
G. (2). Add: "... NEC, article 250, as amended by Chapter 56 of the City of Dallas City Code, ..."
KHA: Complied.
SECTION - ELECTRICAL UNDERGROUND
Part 1— GENERAL
1.4 RELATED WORK SPECIFIED UNDER OTHER SECTIONS
D. There is a reference to "appropriate specifications for concrete ". What specifications are these?
Please provide.
KHA: Complied.
PART 3 — EXECUTION
B. A "density ratio" is not defined. Do you mean a Standard Proctor Density Ratio, or something else? If
you mean something else ,please state what density ratio is being specified; if you mean Standard
Proctor Density, please state so.
KHA: Complied.
C. What is a "secure field density ratio "?
KHA: Revised to state standard proctor density.
D. What does the term "as far as possible" mean? Is the term "these" explicit?
KHA: Section revised.
E. Please specifically reference the drawing where the concrete raceways are specified.
KHA: This line has been removed from the specifications between concrete conduit is no longer being
specified.
SECTION 16450 — GROUNDING
PART 1— GENERAL
A. Add: "... National Electrical Code, as amended by the latest version of Chapter 56 of the Dallas City
Code., as shown ..." Please be specific as to which drawings are being referenced.
KHA: Complied.
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 32 of 33
PART 2 - PRODUCTS
2.3 Ground Test Wells
A. The grammar is poor in this sentence. Please correct.
KHA: Section revised.
2.4 Chemical Ground Wells: What are chemical ground wells? Are they needed in this application?
KHA: This item has been removed from the specification because they are not needed in this
application.
Part 3 — EXECUTION
I do not see any requirement for Ground Mats in the plans. Did I miss something or are these not being
required. If they are not being required, why have this specification?
3.2 Wiring Systems Grounding
G. Add: "... NEC, as amended by the latest version of Chapter 56 of the Dallas City Code., as shown ..."
Please be specific as to which drawings are being referenced.
KHA: Complied.
SECTION 16910 — INSTRUMENTATION
PART 1— GENERAL
1.3 Submittals
B: When should this submittal take place?
KHA: Division 1 of the specifications covers the submittal process in detail.
PART 3 — EXECUTION
3.2 OPERATION AND MAINTENANCE MANUALS
A. Add: "Operations and Maintenance Manuals shall be supplied in a printed form and one electronic
version in Microsoft Word (Latest Version) or Searchable PDF (Latest Version) format."
KHA: Complied.
Comments on 95% Cypress Waters Lift Station and Force Main Submittal. Page 33 of 33