Amberpoint BP 2R-CS050701 (2)ill HalffAssociates
ENGINEERS · ARCHITECTS · SCIENTISTS
PLANNERS · SURVEYORS
8616 NORTHWEST PLAZA DRIVE
DALLAS, TEXAS 75225
(214) 346-6200
FAX (214) 739-0095
July 1, 2005
23022
Mr. Keith Marvin, P.E.
City of Coppell Engineering Department
255 Parkway Blvd.
Coppell, Texas 75019
Amberpoint Business Park/Lot 2R, Block A, Buildings 4, 5, and 6
Response to City comments.
Dear Mr. Marvin:
Halff Associates has addressed the review comments of June 15, 2005, provided by Charlene La
Mattina, E.I.T., for the above project as follows:
Plat
1.
Clarify the type of "utility easement" that is defined by line segments 35-61. Private
utilities such as water and sewer may not be located within public utility easements.
Response: "Utility easement" has been clarified, noting it is for "Gas, Cable TV, and
Telephone."
General Notes
2. General Project Notes: Add to note 10 "No lane of traffic may be closed prior to 9:00
a.m. or after 3:30 p.m.".
Response: Note added.
Grading Notes: Add to Note 7 "Refer to City of Coppell Standard Details for minimum
subgrade prepration (lime stabilization) requirements."
Response: Note added.
Water & Sanitary Sewer Notes: Modify note 11 to read "All fire hydrants in paving shall
be protected with four pipe bollards," unless hydrants located in green-spaces will also be
protected with bollards.
Response: Note added. Only fire hydrants located in pavement or areas where it was
deemed necessary to provide protection will have bollard protection.
Paving Notes: Add to Note 8 "Refer to City of Coppell Standard Details for minimum
sub-grade preparation (lime stabilization requirements." Any variances to the standards
must be requested to the Engineering Department in Writing.
Response: Note added.
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TRANSPORTATION · WATER RESOURCES · LAND DEVELOPMENT · MUNICIPAL · ENVIRONMENTAL · STRUCTURAL
MECHANICAL · ELECTRICAL · SURVEYING · GEOGRAPHIC INFORMATION SYSTEMS
ARCHITECTURE · LANDSCAPE ARCHITECTURE · PLANNING
1 Halff Associates
ENGINEERS · ARCHITECTS · SCIENTISTS
PLANNERS ° SURVEYORS
Mr. Keith Marvin, P.E.
City of Coppell Engineering Department
July 1, 2005
Page 2
Paving Detail
6. Detail the barrier free ramps so that they will be compatible with the future Hike and
Bike Trail.
Response: Ramps have been detailed to a width of l2-feet to be compatible with the
future Hike and Bike Trail.
Refer to City of Coppell Standard Details for minimum concrete specifications and sub-
grade preparation (lime stabilization) requirements. Modify the paving Legend
accordingly.
Response: City of Coppell Standard Details for concrete specifications are referenced
for project areas in the right of way, and a written request will be made requesting
waiver of the lime stabilization requirement based on the project geotechnical report
recommendations. The paving legend has been modified calling for all concrete to be
Class "C".
8. Provide dimensions for all parking spaces on the site.
Response: Typical dimensions forparking spaces have been provided.
The portion of the northernmost driveway onto Sandy Lake Road that is part of the fire-
lane should be hatched to show the installation of 7" thick concrete.
Response: None of the driveways onto Sandy Lake Road are part of the fire lane. The
Plat has been modified to reflect this.
Mass Grading Plan, Future Building 3
10. Note on the plan that there shall be no fill placed in Zone AE.
Response: Note regarding Zone AE ( lO0-yr floodplain) has been added.
11. Adjustments greater than 12" of sanitary sewer manholes should be performed by
methods other than the addition of grade rings.
Response: A note has been added indicating grade rings are not allowed to adjust
S.S.M.H. 's when adjustments are greater than 12-inches.
1 Halff Associates
ENGINEERS · ARCHITECTS · SCIENTISTS
PLANNERS · SURVEYORS
Mr. Keith Marvin, P.E.
City of Coppell Engineering Department
July 1, 2005
Page 3
Drainage Area Map, Buildings 4, 5 & 6
12. Include the Drainage Area Calculation Table.
Response: Drainage Area calculation tables have been included on both drainage area
maps.
Storm
13.
Drainage Profiles
There should be a minimum of 24" of vertical clearance at pipe crossings.
Response: Vertical clearance at pipe crossings has been verified and concrete
encasements have been added where necessary.
The hydraulic calculation for Line G has been revised.
Water & Wastewater Plan
14. Show the 20'x30' Utility Easement along Northpoint Drive on this sheet.
Response: A 20-foot x 30-foot utility easement has been added to the sheet.
15. A gate valve should be placed between the water services and the vault along Northpoint
Drive to prevent possible interruption of water service to the buildings.
Response: A gate valve has been added.
16. The private irrigation line at the south end of Building 4 should be removed from the
public utility easement. The meter should be placed in an easement like the one for the
domestic meters and the fire meter.
Response: The private irrigation line has been moved out of the public easement. The
meter has been placed in the 20-foot x 30-foot easement.
17.
There appears to be a conflict with the proposed 2" irrigation meter at the south end of
Building 4 and the existing 2" water line. Please clarify.
Reponse: The meter has been moved to avoid conflict.
18. A full 20' stick of pipe should be installed from the tee and plugged at the southwest
comer of the water loop. Refer to the mark-ups.
Response: A 20-foot stick of pipe has been added.
ll Halff Associates
ENGINEERS · ARCHITECTS · SCIENTISTS
PLANNERS · SURVEYORS
Mr. Keith Marvin, P.E.
City of Coppell Engineering Department
July 1, 2005
Page 4
19.
Portions of the private fire line and private sanitary sewer line appear to be located in the
"utility easement" described on the plat by line segments 35-61. Private utilities cannot
be located in public utility easements (see comment 1). If the utility easement is
considered public, then remove the portions of the private lines that are within the
easement.
Response: Public andprivate easement conflicts have been resolved.
20.
Provide profiles for all main sanitary sewer lines. Include all storm and water pipe
crossings. There should be a minimum of 24" of vertical clearance at crossings. Should
sanitary sewer line "S" also be encased where it crosses water line "B" at approximately
station 3+50? Ensure separations meet TCEQ requirements.
Response: Profiles for main sanitary sewer lines are provided on sheet C4.02.
Encasements applied where necessary.
21. Sanitary sewer lines should have clean-outs located every 100'.
Response: The current design of the 6-inch and 8-inch sanitary sewer lines appear to be
acceptable under the building code, per telephone conversation with Mr. Keith Marvin
on June 21, 2005. Manholes in the sanitary sewer lines provide access for maintenance.
22. The call-out for the connection to the existing 12" water line off of Sandy Lake Road
specifies an 8" gate valve. Show this valve on the plans.
Response: Correction made as noted.
23.
Consider adding a 12" gate valve before the cap and thrust block in the location of the
connection to the existing line off of Sandy Lake Road. (Refer to the mark-ups.). This
will prevent interruption of service during future construction of the 12" water line along
Freeport Parkway.
Response: A 12-inch gate valve has been added.
Erosion Control Plan
24. Provide erosion control measures for the construction of the driveways along Sandy Lake
Road and Freeport Parkway.
II Halff Associates
ENGINEERS,ARCHITECTS.SCIENTISTS
PLANNERS*SURVEYORS
Mr. Keith Marvin, P.E.
City of Coppell Engineering Department
July 1, 2005
Page 5
Response: Erosion control measures have been provided in plans including one
construction entrance. During construction, the contractor will provide a SWPPP and
will indicate any additional erosion control measures or construction entrances as
needed.
Erosion Control Details and Notes
25. Silt fence should be wire-backed and steel posts should be used instead of wood stakes.
Response: Erosion Control Details sheet has been modified to specify the use of wire-
backed silt fences and steel posts instead of wood stakes.
If we can be of further assistance, please do not hesitate call me at (214) 346-6244.
Sincerely,
HALFF ASSOCIATES, INC.
Mark W. McGraw, P.E.
Project Manager
cc: Jim Gaspard, Transwestern Commercial Services