ST9301-CS020122 T H E · C I '1" Y · 0 F
c-OPP-Ei L
January 22, 2002
Debbie Kiger, P.E.,
Sverdrup Civil, Inc.
Campbell Centre II
8150 North Central Expressway
Suite M-1150
Dallas, Texas 75206-1815
RE: Sandy Lake Road Project Dallas Project #91-830 / Coppell Project #ST 93-01
Dear Ms. Kiger:
I have received and reviewed the revised Sheet 24, which you submitted, that contains changes
necessitated by the Trinity Shores Development on the south side of Sandy Lake Road.
I have the following comments to offer:
1. Please provide the centerline station of the new street. The Trinity Shores plans show the
centerline to be at Sta. 65 + 83.12. If you changed the location we need to know.
2. Please label the radius for the new street. The Trinity Shores plans show a 30-foot radius,
therefore these plans should reflect a 30-foot radius.
3. Please provide the centerline stationing of the inlet. Per my calculations, the centerline
stationing should be at 65+14. Your cover letter states that it is at approximately 65+20. My
calculations are as follows:
One-half of the street width is 14 feet, 30-foot radius, 1 O-foot straight curb section, 1 O-foot
transition, and ~ of a 10-foot inlet is a total of 69 feet. Sixty-nine feet west 0f Sta. 65+83 is
approximate Sta. 65+14.
4. When the low point inlet is shifted, the profile should also be revised to reflect the new low
point location. This will necessitate changing the grades of Sandy Lake Road.
5. Please provide stationing for the beginning, mid-point and ending of the transition east of the
street. Also, please note how long the transition is.
6. You should provide revised sheets for all sheets impacted. Per my review of the Sandy Lake
Road plans, Sheets 24, 46, 90, 91, 92 and 94 will be impacted by the addition of this street at
this location. Therefore, revisions to all those plans should be provided to this office and to
Dallas County.
7. At Station 66+44.02 you state "to match existing concrete", however, because the transition has
been moved east of the proposed street, it appears that additional concrete will need to be added
to the south side of Sandy Lake Road. If this is correct please provide a quantity of concrete to
be added, as this cost will be bome by the developer to the south.
I am unsure what direction you were provided by the developer of Trinity Shores, however, the
above cornments need to be addressed prior to the City approving the Trinity Shores plans. If you
should have any questions or need any clarification please feel free to contact this office at your
convenience.
Sincerely,
Kenneth M. Griffin, P.E.
Director of Engineering and Public Works
CC:
John Mears, P.E., Project Engineer Dallas County
Houshang Jahvani, Trinity Shores Engineer
2125 North Josey Lane #202B
Carrollton, Texas 75006
file/kgriffin/st93-0 l/sverdrup0201 .doc