Sandy L Add FL-CS 900921SHEET -- '
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~"^¢:,,~lt,~,~ tF NUMSEFt tNOLUDtI~G .~.q£A CODE)
UNI¥1:;SiT DEVELOPMENT COMPAN)/
12770 (:GIT RO.~.O · SUt'iE 12IS - DALLAS, TEXAS 75251
'relt:l}henr 214-23J.5771 / Fax 214-233-$881
Seplembe: 20, 1990
Mr. Steve Ge, ram
Director of Publio Wo~'ks
City of Coppell
255 Parkway ~,oui~u3n.l
Coppeli. 'Texas 7501
Mr. Buddy Ec~,o~s
Suporint~dont
Coppeil IS[)
P.O, [;ox q55
Coppeli, Te.~as 75019
Mr. Joe Fitch
C~ppell Church of Christ
733 South Coppell Rd.
Coppell, Texas 75019
Re: Dr'-,lirta§e Ptan - Property r~'crlf~ of Sandy [x¢~e al;d W~s! of Samuel Blvd.
Gentlemen:
This lette~ Is for the pu~poc, o of co;ginning uf cue conceptual approval of a method I0
resolve, In a cc opo~atlvo Gl!orr, a c~monlly existing drainage problem In the Cil~ of
Co~ell, Texas~ which Is occudng ir} tho sodthwo,,f comer of tim Muadow Ridge lownhomo
Development. You~ ey. octJtio~ ct thls letter ~ boii~g roqueslod in order to 1.) faciI~lale the
c0~tion of tho pl~tllng of tho properly hereir~ referred to as the Chumh Tract as well ns
other p~at ~e,:~uests farth con',;n9 hem what is heroin taloned to as the Corner Tract, and 2.)
to evidence our egr~ement t<~ pursue tliu ~olLH;On based on the preliminary Drainage Plan
attached, ~o ti;al the fil~,~l sngin~efing for the ~acil~lies envisioned can be aulhorlzed to
~mmonco.
THE PROBLEM
The Meadow Ridge Townho~:~c project ;.~ ic¢~(~d on ,'he west side of Samuel and can be
Identified on Ih;.: Io,':atior, in:;et n;ap on ¢~e attached Dr-ailaagO PI;.tla. It was constructed in the
mid 8O's and has been complr:led for some time. As pa~*, of Ihs Meadow Ridge developme,~t, a
drainage tnlei (tho "Existing ;r, tet") was. co!~st~uct~d in ~.he ~outhwest corner vt II~e
developrrlent which con,/eys su,"f2eo rurtotf into an und'?,rground 60" storm drainage system.
These faci!i~ios t'lllve beerl conslructc d and dudlcated to :he City el Ooppe!l,
RiChard E. Lee elementary ~,chooi (the "Sc,%ot Tract") lies adjacent to the South aide cf
Meadow Ridg~, boil;g rrm next p~opedy upstream hc.m 1he Meadow Ridge development.
Surface drainage water curt'cnW sheet f~ow3 across me Scl;o¢ Tract, following the
relativsly [!g~ ~)atural dratinage cou¢se into the Existin9 Inlet. Currel~fly no stem3 drainage
Sandy Lake Corners Joint Venture ("SLCJV") ar, d the Coppell Church of ChrlH respectively
own 9.2 3c~es (tl~9 "Ccmef 'l'~ct") and 1.57 acres (Ihs" Church Tract") al Ihe norl~wes/
corner of Samuels a~d Sar)dy Luk,~ on the south s~de of the SuhOOI Tract, being the next
upstream prop,,tries adjacen~ lo the ?cheer Traot, and essentially the top of Ihs overall
drainage area. Currently sl~rfa(:~ drub;age is ~.h~:et flowing generally to the ~orthwesl from
these pro~rties :~ud 3cr~.~s5 ~hO School Tracl and ultimately into ins ~xistlng inlet.
The City h3¢, ;'-dvl;~ed lilt of thr) p:idies her~.io U'~;'d a d,ainage problen3 Is occ~rino al the
floodiJ~g w~ihi{~ lbo Meadow R;dge dev~Jop,r, ef~L SLOJV retained its civil engineer, Dan
Dowdoy ~nd A::sooi~IeS ¢h~ "Engine, or") ~o study {his problem {o d~termlne lhe cause and ~o
suggest ~n approp,'~ale solut:o~. Pursua~l t~, the study' conducled by lbo Engineer It wa~
datelined [ha! the Existing {plot is undersized, evot~ for the current level of development
and more s,~ for ,~ fully developed st~off in the drainage area. The backup at the Existing
Inlet occurs, parlJy duo 1o th6 d~alnaoe acro~s.lhe Comer ]reel, the Church Tract and the
School TracL arid al~o patH/ t',ecau~e cf d~inuOo Ih~t IS rea~ing the Existing Inlet from a
separate d~a[n~ge ~.~eu lo lh6 west and ~;outhwos~ of these properties. This runoff Is coming
Io tho Ex{sting Inlet across that cedain property known locally as the Austin Tract, The
druina9e oomh~0 acro~s fl',6 Auf;fin T~act is Iso~a[od by the. natural topography into a different
drainage pal~err, until i~ re~ch{:~ lbo north bour~d~ry of lite Austin Tract and the School Tra~;I.
THE 80LUTION
The solution proposed by the Orainage Plan !s desi,'Jned to 1.) appropriately resolve the
problem to Ihe extent sa,.,s(:d by storm ri;neff coming across the Corner Tract, the Church
Tr~cl and tile School Tra~;t and 2.) to pmvide a facility to wi,ich n fulure connection ~an be
made la h,zndio ~. port,on of the sep~rat6 drai~:age area from Ihe southwest ~ming across the
Austin' Trac~ to the extent the City lale( deems Ii appropriate.
Attached 1o this lotl;;r Is a copy et the p~elmlinnry d,ainao,~ plan prepared by the Eeglneer
(lbo "Dr,~inafje Plan"). Tho basic elements lo tho Drainage Plan which are conceplually
1, F. xtunsion et the existing 60" stor,~] pipe from the Meadow Ridge development ;nfo
Ihe northwest comes of the School Tracl, sad conslructior~ at lhat location of a properly
sized wye Inlet (the "New lnle¢) Io except the full/ developed amount of slorm waler from
the School Trr~¢.l, the O~li.~rcl~ T:ac.l ¢nd the Comer Trz~oL
2, Ceri'Mructioo Of a d,'ainage Swale iJJi]hlng norJh arid SOulh ac~oss the west side of
the School Tract, to direct the sheet flow from the School Tract and the upstream properties
into the New Inlet, T~e parties agree that the drainage swale is an appr~rlale facilily al
this location because it is ;~c~os5 the wes~e~ mo~t side of the schcol playground area which
is 425 feet in width. The u?¢(de wili be conciructed with a 10 to one side slept o{~ Ihe
playground slda to prov{d~ sot easy m~dnienanco of lhe swale and an gradual tran~ tior~ to
the Sa/ground are~.
3. A pormanerd easement and dedicatlon of the flew Inlet to the City for
maintenance purpos¢.s.
4. A dra;naoe eesemen: from the "ohool district tO lhe Corner Tract and the Church
Tract along the location of il;e swale. The swaJe ,.,/iii be ntaintalned by the school district.
5. Agreement of tho Corner Tr~,cl a~d the Church Tract !o coordinate an onslte
dr&in,ge plan Sot their rusp~c*ive prope,t;es designed Io deliver srorro drainage from those
proped{8~ to the south er~d of the swale.
The pa[tie.~ berate ~cknowtedge that the;r i;.,prov~ of the Drair~a9e Plan fs at this time
conceptu~.d tn nature, and t~;~t lhey a,6 by this letter e~pressing their willingness 1o c~.;{.~, or
-2.
permit con~truc¢on of the various ~ppf~cabte elements in the Drainage Plan on the!r
respective properties. The parties hcrelo ac~'~owledge that their agreemeht to parti~lpate
tn th~ Drainago Plan is sub, eot to 1.) ~pproval of lhe final en0ineer;ng design of the D~alnage
Plan by the chv, and by each par~y to the ex~e~t lha f~ilities are located on its ~o~rty,
and 2.) ~greement amor~ the F.~rlies as lo how th~ cost of implementing the Drainage Plan
will be allocated ~t~or~g the parties. If this letter c~frec{ly fefleclS your position, please
execute !~ In tho space provided below ~nd r~tu~n one cc, py to the undersigned. For
~nver)ience, this letter ma~ be execuled In multiple counterp~ts. U~n receipt o~ all
signature% ~LCJV v~;1} cause a cost e~limate fo~ Ihe Drainage Plan to be prepared by the
Engineer and subm[~t~d to the pa(t~es with 5ugges[ed 311ocatlon of the cost. Upon a~roval
therenf, SLCJV w;ll cause lhe final engineering to be prepared end submitted to the panics
for their apc~ov,~l Please carl t[ you have a~y questions,
Yours vory truly,
Sar~dy Lake Corners Joln!.Venturf~
by Its Manager, Unl,.~sl Fin~noiaJ Co,potation
Michael
APPROVED iN CONCEPT:
Cit~/of Col)Pal
~t,3ve C~oram, Direc..i,:~r ol PuC, I;c Works Date
Coppell Indeper~dent .School
Buddy Echols, 8up,~;m~or, Jent Date
'Coppell Church of Chdsl
Joe '
Fitct~
Date
Enclosure
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