Carter Addn 3-CS120508 (2) DOWDEY, ANDERSON
rr
& ASSOCIATES, INC.
CIVIL ENGINEERS
5225 Village Creek Drive
Suite 200
Plano,Texas 75093
972.931.0694
912.9319538 Fax
May 8, 2012
George Marshall, P.E., C.F.M.
City of Coppell
255 Parkway Boulevard
Coppell, Texas 75019
Re: Carter Addition Phase Ill
Construction Plan Review Comments - 3rd Submittal
Dear Mr. Marshall:
I have reviewed your comments and have addressed all of them. I offer the following
explanations and revisions corresponding to the comment number:
General -
1. Revise plat to show any necessary easement modifications. Dimension and label
easements circled.
Comment addressed.
2. Where possible show pot-hole elevations on gas main.
Comment addressed.
3. Where possible show retaining walls in plan views.
Comment addressed.
Paving Plan -
4. Reference City details, don't include your own unless the City does not have one.
The paving notes and erosion control details have been removed as requested.
5. In a cul-de-sac we typically carry the 11' parkway around.
Due to the mountable curbs in the project, the 11' parkway is still proposed.
6. Show the BFRs for the sidewalk along Heritage Oak Court at the intersection of Carter Dr.
Comment addressed.
7. The City will still require written approval from gas company for road and utility crossing.
I am still coordinating with Atmos to receive approval on the road and utility crossings.
8. Legacy CT - Show Driveways on narrow lots - Interaction with utilities.
Comment addressed.
DOWDEY,ANDERSON&ASSOCIATES,INC.
State Registration No.F-399
w--i k DOWDEY, ANDERSON
Mt% & ASSOCIATES, INC.
CIVIL ENGINEERS
5225 Village Creek Drive
Suite 200
Piano,Texas 75093
972.931-0694
972.931.9538 fax
9. At the Intersection of Legacy & Heritage Oak there appears to be a 4.76 A PVI. Quite
large without a vertical curve.
I've used this type of A-value at an intersection in the past. I believe this is adequate for
an intersection because the vertical sight visibility is typically not an issue at an
intersection.
Drainage Plan —
10.Show the retaining wall cross section on the profiles.
Comment addressed.
11.Show the profile of the storm drain extended to the creek and put the headwall on piers
with necessary erosion protection.
Comment addressed.
12.With the future driveways along Carter and needing a trapezoidal channel to carry 28.1
CFS, it may be prudent to include storm through this section & maintain a visual ditch on
the surface.
The ditch is still proposed, but design alterations have been made. The ditch has been
moved further into the lots along Carter Drive and a drainage easement has been added
to the plat to incorporate the drainage ditch. Also a note has been placed on the
drainage area map to state the future driveways of the three lots on Carter Drive will be
required to install a 21" RCP with sloped end headwalls.
Water Plan —
13.Water tie into Carter Dr, show as previously with a valve between connections.
Comment addressed.
14.We do not want water circling lot lx. Please tie water in Legacy Ct to Water behind lots.
Comment addressed.
15.For off-street water, we will need locators placed on lots to identify pipes.
Comment addressed.
Sanitary Sewer Plan/Profile —
16.See comments on Plans.
Comments addressed.
DOWDEY,ANDERSON&ASSOCIATES,INC.
State Registration No.F-399
DOWDEY& , ANDERSON
rr ASSOCIATES, INC.
CIVIL ENGINEERS
5225 Village Creek Drive
Suite 200
Plano,Texas 75093
972.931-0694
972.931.9538 fax
Grading Plan —
17.Include a wall detail, you may need a railing in some locations.
Structural retaining wall details are now included in the construction plans.
18.Show steps if being included now or later.
Comment addressed.
19.Grading on lot 16 Block A needs to be reviewed. 478.1 FP to elevation 473.8 in few feet
within a drainage and utility easement.
Comment addressed.
20.We don't want to drainage going over the walls.
There will be three lots with drainage going over the retaining walls. We must accept
drainage from our neighbors so we request that you permit the water to go over the
retaining walls in this area.
I respectfully request approval of the construction documents. If you have any questions
please call me at 972-931-0694 at your convenience.
Sincerely,
i //j lerz.\_____
J. Casey ',SS, P.E., CFM
DOWDEY,ANDERSON&ASSOCIATES,INC.
State Registration No.F-399