Park West CC(1)-CS 870929 M, BERT H. ILM, FF ASSOCL/tTES, INC.
ENGINEERS .~XD SCIENTISTS
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-:::---- .... :::' ~::=----':':' September 29, 1987
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City of Coppell
1515 Bethel
Coppell, TX 75019
Att:Ms. Taryon Bowman
Re: Gateway Park at Coppell Final Plat
Dear Ms. Bowman:
This letter is in response to the comments from City of Coppell
Engineering Staff received on September 25, 1987 concerning Gateway Park at
Coppell construction drawings. See attached copy of written comments.
1. Regarding the size of Gateway Boulevard please see attached a
letter from T. N. Searcy, Assistant Vice President of Southern
Pacific Transportation Company.
2. Grapevine Creek has been channelized through this project. The
City of Coppell has a Conditional Letter of Map Revision from
Federal Emergency Management Agency (F~A) on file.
3. A drainage area map showing the offsite drainage is being
prepared.
4. Grading of the site will be performed in phases. A copy of the
grading plans showing phase limits will be incorporated into the
next submittal.
5. A runoff coefficient of 0.7 was agreed to be acceptable at the
meeting between the City of Coppell City Staff and Albert H. Balff
Associates, Inc., Friday, September 25, 1987.
6. Time of concentration for the drainage areas has been added to
Sheet DA-1. T.P.-40 was used to determine intensities.
, BERT H. HALFF ASSOCIATES, INC.
ENGINEERS .,LN'D SCIENTISTS
City of Coppell
September 29, 1987
Page 2
7. Street scape plan requirements are being addressed in construction
plans unless a specific variance has been requested.
8. A 1" sand cushion is being utilized over reinforced concrete
pavement to set brick pavers per the City of Coppell standard
detail.
9. The width of the drainage easements were deemed to be satisfactory
at the above mentioned meeting.
10. Phasing notes and delineation are shown on the construction plans.
The phasing lines will be emphasized to make the divisions more
clear.
11. Street lighting including conduit size and location is shown on
paving plans.
12. Fire hydrants are spaced at 300' maximum. Two fire hydrants will
be added on Southwestern Drive between Metro Drive and Belt Line
Road.
13. We are seeking approval from the City Engineer to allow horizontal
curves in sanitary sewer lines as per City of Coppell Subdivision
Ordinance Appendix A - Section III, paragraph A, subparagraph
15. Please find attached a copy of a letter from the Fort Worth
Water Department outlining their policy on sanitary sewer
alignment. Bill Foster, Section Supervisor, T.V. Section of
Dallas Water Utilities can provide additional information upon
request. He can be reached at 670-0770.
14. Ail drawings will be signed and dated by the appropriate engineer
when the review process is complete.
The following are answers to comments made by Shohre Daneshman on the
copy of the engineering set.
1. Sheet SS-4: As discussed in the above mentioned meeting the use of
bends in the storm sewer is acceptable to the City.
2. Sheet SS-5: Information for lateral pipe LD-5 is being added to
the plan view.
M BERT H. HALFF ASSOCIATES, lNG.
ENGINEERS .4~'~D SCIENTISTS
City of Coppell
September 29, 1987
Page 3
3. Sheet SS-8: City of Coppell Type B storm sewer manholes will be
placed at Sta 13+61 and Sta 14+83.
4. Sheet SS-9: As discussed at the above mentioned meeting the
connection of the double 60" R.C.P. to the existing box culvert is
acceptable to the City as shown on the plans.
5. Sheet SS-13: The intersection of storm sewer liner TG-1B and
TG-3A is at an angle of approximately 60°.
6. Sheet SS-15: Ail pipe discharging into Grapevine Creek will have a
slope end section per detail Sheets SD-1 through SD-3.
The following are answers to comments made by Steve M. Morton.
1. Sheet FP-I: Regarding the maintenance agreement for Grapevine
Creek please see attached letter from T. N. Searcy.
2. Paving Sheets: A note designating the proposed user of the
conduits to be installed will be added to the plans.
3. Sheet P-l: 2" Water meters shown on plans are for irrigation
purposes ·
4. Brick Pavers Intersection Details: The brick pavers at the
turnouts are being revised to be on a straight line next to the
right-of-way ·
5. Sheet P-6:
a. Bullock Drive is a two way street.
b. Brick pavers are being removed from Bullock Drive. The
pavement will be reinforced concrete per City of Coppell
s t and ards.
c. East bound right-turn only lane will be marked by a solid
white button pattern.
6. Sheet P-8: The connection to Southwestern Drive is asphalt
pavement to allow for a smooth tie-in when Southwestern Drive is
improved to reinforced concrete pavement.
, BERT H. HALFF ASSOCIATES. INC.
ENGINEERS .~ND SCIENTISTS
City of Coppell
September 29, 1987
Page 4
7. Sheet PD-3: Please see typical section A-A on Sheet PD-2 for
median crossing.
8. Sheet WS-1 and WS-2:
a. 2" water meters will be added to this sheet, all conduits
will be as shown on paving plans.
b. Three fire hydrants will be added to the south side of
Southwestern Drive between Metro Drive and Belt Line Road.
c. Phase lines for the project will be shown on Sheets WS-1 and
WS-2.
9. Irrigation Plans: Irrigation plans are being revised per the
mark-up from the City.
To date we have not received written comments for the Construction
Drawings from Ginn, Inc., City Engineers for Coppell. Per our conversation
with Shohre Daneshman and Kevin Peiffer on Monday, September 28, it is our
understanding that revised plans should be submitted to the City of Coppell
before 5:00 p.m. on October 9th.
We hope these changes will be satisfactory and we look forward to
continue working with you.
Sincerely,
ALBERT H. HALFF AS SOC IATES, INC.
Stefa~o Costantini
\
/Jj
At tachments
cc: T. N. Searcy