Deforest Court-CS010327Sent By: O'Brien Engineering, Inc.; 972 312 0245; Ma~-28-01 11:24AM; Page 2/3
O'Brien
a.011 W. ~.no ~. Sui~ ~0~
P~, T~ 7~3
FA: (972) 312-~75
H~mul~mlo~
~nsuRinB
~ch 27, 2~1.
Halff~mc~es, Inc.
8616 No~w~st Plea ~ive
D~I~, Te~ 752254211 F~: (214) 361-5573
~: DeFore,t Co~ ~velopment P~ Dated, March 9, 2001
Dear JaJmc:
A~ you know, wc havc been retained by Mr. Bruce Birdsong, former property owner of thc
· residential tract west of Deforest Court Addition. Prior to the recent placement oFfill for proposed
Deforest Court, the natural drainage of the area was generally in an cast-southeasterly direction
ac'toss Mr. Birdsong's property. With the placement of fill along Mr. Birdsong's ca~ property line,
drainage of his property is blocked, resulting in an increase in water surface elevation of his pond and
the creation of bogs and ponding elsewhere onsite.
The City ol'Copp¢lL in its review of thc proposed subdivision plans, has defr'rr~d to Mr. Birdsong
for acceptance prior to giving their final approval. Our understanding is that once Mr. Birdsong has
indicated his approval of pertinent issues in the plans, the City will complete their review.
Mr. Birdsong sold the property to Mr. Scott Cooper on February 28, 2001, but has agreed with Mr.
Cooper to continue his involvement until this matter is resolved. With respect to the reference__ pinna,
we have the following comments:
1) Sheet (3-1 ~ Please list on the plans the acceptable alternates to keystone wall.
2) Sheet DA-2 - In our meeting earlier we had talked of a flapgatc on the detention
pond to eliminate flow from Denton Creek into the pond and storm
drain system. We would like this to be specified in these plans.
Site topography suggests that portions of the subdivision west of Mr.
Cooper's property drain to the west, through his tract, although your
drainage mca map doesn't indicate this. The DA map rather indicates
that the west property line of Mr. Cooper's tract is the westerly limit
of area draining to the east. If there is additional runofffromthe west,
the proposed storm drain sy~em may not be adequate. Please indicate
on th~ plans, how the w~st property linc has become thc new drainage
divide tbr thc area, or otherwise delineate all of the area which is
draining fi-om the west.
Sent By: O'Brlen Eng[neering~ Inc.; 972 312 0245; Mar-28-01 11:25AM; Page 3/3
Mr. Jaimc B~ard, E.I.T.
M~ch 27, 2001
Page 2
3) Sheet STM-1 ~ 24" a~d 12" landscape grate ~ets ~e ~lled om. P~ s~i~ on
~ p~ w~t ~ inlet (~.: ~u~er, ~el nnm~, etc.) ~11
~ ugd. ~ spcci~ tho co~ect ~t~ion procaine for ~ ~et,
grate ~d pi~.
4) Sheet PRF-1 - Plc~ ~atc t~ ~umc of thc 5 yc~ ~ wat~ s~ clearon
(43~).
On P~- 1 ~ P~- 1 A, the 5 ye~ HGL ~di~tcs pm~ flow ~ ~c
36" ~ 24" pipes, w~c ~e vcloci~ ~c~iom (V, V2~g) ~e ~
on ~ pi~ flow. Ple~ ~ow ~c ~ect c~c~tiom, ~ ~t
5) ~ co~ion cmr~e m the proj~t ~ffi blocks dra~c ~om ~. Bffd~ng's propc~.
~. Jor~ ~cated in om ~st ~t~ (Fcb~ 23) ~t ~ wo~d ~ m~ect~ ~
~ly ~ by ~m tho r~st week ofM~ch. ~n c~ wc c~ ~ to ~ co~t~?
In mvi~, appmv~ or d~ppm~ng of the~ p~ or ~y potion of th~eo[ ~it~r O'B~
Eng~ccr~g, Ira., Mr. Birding, ~r ~. Cooer imply nor ~ccpt ~ liability for thc dcsi~
~at~s, ~ or ot~ ~~n coma~d t~m~
If you ~vc ~ qucstiom or rcquke ~Hhcr ~omtio~ pl~ do not hesi~te to ~1.
S~erely,
O'B~EN ENG~EE~NG, INC.
xc: Mt'. Bruce Birdsong
Mr. Scott Cooper
Mr. Mike Martin, P.E., City of Coppell