Four Seasons 2R-CS040722H E C I T Y . 0 F
COPPELL
July 22, 2004
C. Jack Evans, P.E.
Pacheco Koch Consulting Engineers
8350 N Central Expy, Suite 1000
Dallas TX 75206
RE: Four Seasons Addition, Lot 2R (BCE Specialties)
Construction Plan Review Comments
Dear Mr. Evans:
The City of Coppell has reviewed the referenced plans and has the following comments to offer:
Dimension Control Plan - Sheet CI.I:
1. There is an inlet to be constructed on Sandy Lake Rd. that appears to conflict with your
driveway location. Coordinate with Matt Atkins of Teague, Nall& Perkins to get your
design in line with theirs.
2. There are radii in the fire lanes that do not meet our minimum requirements. Specifically the
one on the northeast comer that is 25' and one on the southxvest comer that is 25'. Those
need to e a 30 m~nimum radius each.
We would like to discuss the construction scheduling for this project with you to determine
whether the improvements to Sandy Lake Rd. will be under construction or complete when
you start your work. It will make a difference in how you approach the connections in Sandy
Lake Rd.
You may be required to construct temporary drives and drainage structures until Sandy Lake
Rd. is complete.
Grading Plan - Sheet C2.1:
1. You show some grading that will encroach in the drainage channel parallel to Sandy Lake
Rd. That will not be allowed until the drainage structures for Sandy Lake Rd. are completed.
2. The drive on Royal Ln. where you are proposing to relocate the low point inlet needs to have
a small grate inlet or slotted drain. Please provide calculations for anticipated flow to that
area.
Drainage Plan - Sheet C3.1:
1. Provide profiles for all storm drain lines and laterals.
2. Provide details for inlet relocation including paving and connection details, especially
demolition of the inlet and connection to the existing line.
3. The existing lateral for that line shows to be a 2l" RCP, you are showing to install an 18"
RCP. We need to see computations for all the storm sewer pipes themselves and all the
offsite drainage to be picked up by the two 4' x 3' boxes.
4. There are several connections to the proposed 7' x 3' box culvert "by others" that tie into an
existing 7' x 3' box. That box does not yet exist and may not exist by the time you construct
your facilities, so you need to plan for temporary structures to be constructed with this
project.
Storm Sewer Profiles - Sheet C3.2:
I. Profile all storm sewer lines.
2. There are several areas on the profiles you provided that show very little cover over culverts.
Specify appropriate strength for the culverts that carry direct traffic.
Water & Sanitary Sewer Plan - Sheet C4.1:
1. Connections to existing waterlines should have a valve between the service taps and the
vault.
2. The proposed connection to the existing waterline in Royal Ln needs to indicate by a method
other than open cut.
3. Verify that the water and sewer lines actually exist in those locations where you plan to make
connections. For example, you show a 6" waterline going all the way to the property line,
and a sanitary sewer line crossing Sandy Lake to the property line I'm not sure they exist.
If not, the sewer line will need to be bored under Sandy Lake and the waterline crossing will
need to be constructed such that it goes under those future box culverts.
4. Show the existing 24" water transmission main on the east property line.
5. Show the piping from the FDC back to the building.
6. Construct a manhole within the ROW adjacent to the property for the 8" sewer line so that
city crews can access our portion of the line if necessary.
Paving Plan - Sheet C5.1:
1. This is a primary image zone and as such should have a stamped concrete section adjacent to
the property line.
2. You show a connection to existing Sandy Lake Rd, but no detail of what kind of pavement
section that is.
3. You indicate the approaches connecting to the future paving are 6" flex base, yet your paving
section shows a lime-stabilized subgrade throughout the site. Please clarify.
4. Your paving plan will need to show the pavement replacement on Royal Ln for not only the
gutter transition of the old inlet, but show proper gutter transition for the new inlet also.
Erosion Control Plan - Sheet C6.1:
1. We may require some additional erosion control for the work adjacent to or in the existing
ditch along Sandy Lake Rd.
2. You need to comply at all times with TC£Q requirements.
Please make the necessary changes and submit these marked-up plans and two sets of revised
plans to the City for review. If you have any questions, please contact this office at your
convenience.
Sincerely,
Keith R. Marvin, P.E.
Civil Engineer
Office Phone: (972) 304-7044
Fax: (972) 304-3570