SC-Pinkerton E1-CS080115
141 GLENN
[ZJ ENGINEERING
ATTN: Michael Garza, E.I.T.
Engineering
City of Coppell
255 Parkway Blvd.
Coppell, Texas 75019
January 15,2008
Re: Pinkerton Elementary Parking Expansion
Plan Review Response Letter
Mr. Garza,
In response to your Pinkerton Elementary Parking Expansion review comments, we offer
the following responses to your individual comments. Your comments are listed in
italics; our responses are in a plain font.
Grading Plan
1. Show detail of the swale.
Added details to the grading plan and the drainage area map. The Detail includes
the 100 year water surface in the ditch.
S WPPP Plan
2. Show where the concrete washout will be?
Added washout area along with the spoil area to the SWPPP plan.
3. Ensure that silt fence through the swale will be adequate for erosion control.
Added additional silt fence. Also with such flat slopes (0.50% in Grass) the
velocities are very low and we feel the silt fence will be adequate.
~'- it;"LN 016
GLENN ENGINEERING CORPORA TION
LETTER.doc
105 Decker Court, Suite 910, Irving, Texas 75062
972.717.5151 FAX 972.717.2176
PINKERTON PLAN REVIEW
Drainage Area Map
4. The new drainage area map should show the parking lot as separate drainage
with the appropriate "e" factor...
We added sheet CG 1.05A and drainage area map for the new construction
showing the revised "C" factor and the revised drainage areas for the new and
existing parking lot.
5. Show the proposed swale and provide and submit the calculation for the run-ff
from the parking lot and the properties to the east that discharge into the
swale...
Added details to the grading plan and the drainage area map. The Detail includes
the 100 year water surface in the ditch for the existing and new parking lot. See
Sections "A-A" and Section "B-B".
If you have any questions please give me a call,
Sincerely, . /l .
/___--..... ~ I
/ I I i j ! I
" l.r" /' '.' / "I / I
j )Jl.i / .-~I 0 ',-
Robert A. Howman
Project Manager
CC: Mr. Mike Elmore, SHW Group, Via Fax
GLENN ENGINEERING CORPORA TlON
LETTER doc
105 Decker Court, Suite 910, Irving, Texas 75062
972.717.5151 FAX 972.717.2176
PINKERTON PLAN REVIEW