ST9301-CS 981019Bverdrup
Civil, Ino. - D~II4~, Tex~l~ Offloe
8150 N. Central Expy · Suite M-1150 · Dallas, TX 75206 · Tele: (214) 696-3433 · Fax: (214) 696-3499
MEMORANDUM
TO:
FROM:
DATE:
SUBJECT:
Project #011889 Sandy Lake Road
We have reviewed the comments received from the City of Coppell for the Sandy Lake Roadway
Improvements from MacArthur Blvd. to Kimbel Kourt. The following are our responses to the
comments.
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~l~.OJ~l. COMMENT.' The typical roadway width is 27 foot back of curb to back of curb, not 28 foot.
¥~ -l\~n_,~,~ RESPONSE: The typical section shows that the project is 2.12.5 ft. lanes, with a 3 ft. bike lane'~ '
which equals'28 ft. The City of Coppell Standards show that the typical section for this arterial
( should be 25 ft. wide, which we have complied with. The 3 ft. bike path was added during the
project.
COMMENT: The City's Sandy Lake Road plans show that the existing 16" water line needs
to be lowered. The 16" water line should be shown in your profile to insure that there are no
conflicts with the proposed improvements. There is also a City of Coppell proposed 30" water
line that should be shown on your plans to insure that it does not conflict with the proposed
improvements.
RESPONSE: Will comply.
COMMENT: The transition to the free right lane is shown at approximately Sta. 17 + 42 on
the City of Coppell Sandy Lake Road plans. In essence, the transition should begin in your
section not in the City of Coppell section. Our roadway eastbound as we approach this section
of Sandy Lake is only 27 foot back to back, not 40 foot back to back, as shown.
RESPONSE: This is a change. All previous submittals have shown no transition to a free right
mm lane. Prior coOrdination showed the transition on Kimley-Hom's plans.
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COMMENT: The top of curb elevations as shown do not match the top of curb elevations in
the cross sections.
RESPONSE: All elevations will be checked and corrected as required.
COMMENT: The approach grade on the City of Coppell Sandy Lake portion is 3.54% and the
beginning grade on this section is 3.89%. Is that an instantaneous change or an error in the
grade?
RESPONSE: This is a change. Prior coordination showed a 3.89% grade on Kimley-Horn's
plans. Please provide final resolution as to who will be required to change their plans.
COMMENT: The note at Sm. 17 + 50, that states "begin brick pavers" should be removed; the
pavers should only be at the nose of the median.
RESPONSE: Will comply.
0
COMMENT: The intersection at MacArthur Blvd. and Sandy Lake Road should be a full brick
paver intersection, not a banded intersection as shown.
RESPONSE: Will comply.
Se
COMMENT: The radius at the intersection should be 40 foot, not 50 foot as shown.
RESPONSE: This is a change. Our previous submittal had the radius at the intersection at 40
feet. The radius at the intersection were increased per comments from previous submittal. 50
foot radius provides better turning space for the design vehicle. Please provide final resolution.
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COMMENT: The traffic signal poles and controller location should be shown on the plan view
to insure that they do not conflict with any other improvements.
RESPONSE: Will comply.
10. COMMENT:
Kimbel Court.
RESPONSE:
turning radius.
The left mm lane for Kimbel Kourt ends approximately 35 feet away from
Why? It appears that it should be lengthened approximately 25 feet.
The left turn lane ends at the location shown on the plans to provide for a 50 feet
We will provide 40 feet turning radius and increase the storage to 50 feet.
11. COMMENT: The 50 foot elevation should be provided at Sta. 22 + 50 and 23 + 50.
RESPONSE: Will comply.
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12. COMMENT: The transition from Sra. 24 + 11.82 to approximately 25 + 40 shows what appears
to be a curb line. Is it in fact an asphalt curb, striping or buttons?
RESPONSE: Curbs are not provided along the transition, see typical section and cross sections.
13.
COMMENT: The contract between Sverdrup and the City of Coppell states that the
deliverables for the Sandy Lake sewer design is plan and profile drawings and a parcel site plan
at the Sandy Lake Road lift station. The site plan should show the sewer line interface and
connection requirements at the pump station. The parcel site plan and the profile are not
provided for the proposed 21" sewer line. That information should be provided.
RESPONSE: The sanitary sewer plan and interface with the pump station will be shown on the
Sandy Lake Roadway Improvements from Kimbel Kourt. to City of Coppell East City Limits.
The As-Built information received from the City is inadequate and shall require a survey. This
survey was not included in the fee proposal as stated in the contract between the City of Coppell
and Sverdrup. Per the contract, a fee proposal will be submitted to the City of Coppell to
complete required field surveys, in order to complete the above request and sewer design.
14.
COMMENT: Please comment as to why the removal of the section of MacArthur Blvd. north
of Sandy Lake starts at Sta. 3 + 05 and 3 + 60. Is it possible that both of those could start at the
transitions to the inlets? Also, with a steeper grade on both sections, i.e. around approximately
2 % as opposed to 1.6%, it appears that trees and the existing brick wall could be saved. They
also might be salvageable under the existing design when your cross sections are corrected. It
appears that the cross section at Sta. 3 + 60 on MacArthur is incorrect.
RESPONSE: It appears that the same grade from MacArthur northern road was being
maintained. Since the design is adequate, our desire to keep the present slope rather than make
a change to several plan sheets, is preferred at this stage of design. Also, cross section 3 + 60
was drawn incorrectly. When drawn correctly, the sign and trees are not impacted.
15.
COMMENT: No cross sections were provided for the section of MacArthur south of Sandy
Lake from Sta. 6 + 06 to approXimately 8 + 50. Is there a grade difference that would necessitate
the removal of trees or will some type of retaining wall be needed?
RESPONSE: From Sta. 6 + 06 to 8 + 50, the roadway improvements are to match the existing
pavement elevations as shown on the typical section. Therefore, cross sections will show
redundant information, which is already shown on the typical sections. The grade difference is
only 2.5 inches, which would not require tree removal. However, tree removal is. required
because of the lef~ turn lane required by the City.
16. COMMENT: The drive approach at Sta. 17 + 46 appears to be steeper than necessary. It is
quite possible that the removal and replacement may need to extend to Sta. 0 + 87, as opposed
to 0 + 74.
RESPONSE: The limit of 0+ 74 is to the proposed slope easement. To continue the
reconstruction of the driveway to 0 + 87 is additional pavement and curb removal which is
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unnecessary and adds cost to the project.
provide final resolution.
The slope complies with the City's Standards. Please
17. COMMENT: The driveway located at Sra. 24 + 37 appears to be steep. It is quite possible that
the replacement may need to extend to the proposed right-of-way line.
RESPONSE: The driveway shown on the plans is temporary. The final driveway extends to
the right-of-way line. The temporary driveway slope can be extended to the right-of-way if
desired, but it will be removed later.
18. COMMENT: The cross section shown at Sta. 3 + 40 on MacArthur probably should be 3 + 90.
RESPONSE: The cross section shown at Sta. 3 + 40 is on Kimbel Kourt.
19. COMMENT: The cross section shown at Sta. 4 + 15 on Kimbel Kourt doesn't match the profile
view. Several numbers are given as 454.36, however, the actual elevation appears to be closer
to 447.4.
RESPONSE: Will correct.
20.
COMMENT: The drainage pipes discharging into the channel on the south side of Sandy Lake
should discharge more with the direction of flow i.e. approximately a 45' discharge if possible
as opposed to a 90° discharge.
RESPONSE: Based on the size of the culverts, the operation of the outlets are functional.
Generally, if the culvert outfalls into a bar ditch, the angle is 45° , however, in a wide channel,
a 90° connection is acceptable. Any revisions will be considered extra work. Please provide
final resolution.
21. COMMENT: The hydraulic grade line should be shown on all storm drain systems profiled,
along with the pertinent hydraulic information.
RESPONSE: Will comply.
22. COMMENT: Details for the street name blade should be provided.
RESPONSE: Will comply.
23. COMMENT: The signal heads on the traffic lights should align with the lanes. There should
also be a light provided for each lane.
RESPONSE: Will review and make any necessary changes.
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24. COMMENT: Are advance detectors going to be provided for the traffic lights on north and
south bound MacArthur Blvd.? It appears that they may be needed.
RESPONSE: Will provide.
25. COMMENT: The opticom is not to be provided by the City of Coppell. It is part of the signal
installation and should be provided as part of an overall turnkey signal installation by the
contractor.
RESPONSE: Will comply.
26. COMMENT: When additional traffic lights are added, it is quite possible that the mast arms
as proposed may be too short. Also, cable and signal heads will need to be recalculated
RESPONSE: Will review and make any necessary changes.
27. COMMENT: Typically, any mast arm over 36 feet requires a 36" diameter drill shaft. This is
even shown on the TxDOT Pole Foundation sheet included with these plans.
RESPONSE: Will correct.
28. COMMENT:
diagram.
RESPONSE:
It appears that the ground boxes A & C do not match what's shown on the
Will correct.
29. COMMENT:
pavers..
RESPONSE:
Pull boxes and the controller should be relocated outside the limits of the brick
Will change.
30. COMMENT: The first loop detector for westbound Sandy Lake should be relocated west of
Kimbel Kourt, so turning movements onto Kimbel Kourt do not activate the MacArthur traffic
light.
RESPONSE: Will correct.
31. COMMENT: Please be advised that the City of Coppell does not use the standard TxDOT
traffic signal structure. The City of Coppell mast arms should be used.
RESPONSE Will correct and note City of Coppell mast arms.
32. COMMENT: It appears that most of the cross sections as provided do not match the profiles.
The top of curb elevations given on the profiles are different than the top of curb elevations given
on the cross sections.
RESPONSE: All of the cross sections were checked out and appear to be correct, except Sta.
3 + 60 on MacArthur Blvd. See comment 35. Median elevations shown on the profile at Sta.
23 + 00 will be revised.
33. COMMENT: It appears that at several locations, the transition from the sidewalk to the existing
channel on the south side of Sandy Lake Road is approximately 2 to 1. This is too steep.
RESPONSE: Will review and make any necessary changes.
34. COMMENT: It appears that at several locations, the transition from the sidewalk to the existing
channel on the south side of Sandy Lake Road is approximately 2 to 1. This is too steep.
RESPONSE: Will review and make any necessary changes.
35.
COMMENT: The elevation for the cross section at Sta~ 3 + 60 is incorrect. The cross section
as shown shows you are cutting approximately 1 ½ foot out of the median of MacArthur north
of Sandy Lake, which would eliminate all of the trees, the brick sign, etc. However, upon
investigation, it appears that the top of curb as shown on your cross section is incorrect. The
profile shows the top of curb as 455.8, while you are showing the top of curb elevation at 454.12.
Please reevaluate and correct this.
RESPONSE: Will evaluate and correct as needed.
36. COMMENT: Please provide cross sections from Sm. 6 + 06 to Sm. 8 + 50 along MacArthur
Blvd. south of Sandy Lake Road.
RESPONSE: See comment 15.
cc: 011889 Correspondence
Kma Griffith, City of
S. Hebb
M. Goode
R. Baum
P:011889/500corn/501 memo/memomears 101998.doc