Townhouses-CS010521 21d7395961
Ma~-~l U1 Ol:~_?p M? ~an I] Maier C.E. ~' '73~8~1
CONSULTING ENGINEERS, INC.
.Mr. Keith Reinhart
C~N Letup Development
Via Fax No. (972) 404-1833
Mr. Steve Topletz
Andante Development,/nc.
Via Fax No. (972) 414-6613
Ms. Jean Boney
Site Concrete, Inc.
Via Fax No. (972) 513-0661
Mr. Mike Martin, P.E.
City of Copper
Via Fax No. (972) 304-3500
Re: Townb_ouses of Coppell
lq]DM Job No. 99-10-113
Please be advised that Ken Griffin has approved our request to eliminate the lime
treatment under our private paving. To compensate, the fine lane paving increases fi'om
6" to 7" in thickness and the other private paving increases from 5" to 6" thick. This
does not affect any paving within the public right-of-xvay.
Mike Daniel
Two NorthPark ] 8080 Park Lane ! Suite 600 / Dallas. Texas 75231 [ (214) 739-4741
CONSULTING ENGINEERS, INC.
oo,
Mr. Ken Griffin, P.E. ~.~ (.) ,~~ ~'"'"~'
City of Coppell /
Coppell, Texas 75019 .
Re: Townhouses of Coppell
~MJob No.: 99-10-113
Dear Ken:
Please accept this letter as a formal request for a variance to that part of the subdivision
ordinance that requires lime stabilization under private paving in the City of Coppell.
Based upon the reconmaendations o£our Geotechnical Engineer (attached), we propose to
construct 6 inch 3000 PSI concrete paving on a compacted but unlimed subgrade. We
propose this section for all private paving including the fire lane.
Thank you for your consideration of this request. Please let us know if you have any
questions.
Sincerely,
NATHAN D. MAIER
~ERS, INC.
Mike Daniel, P.E., R.P.L.S.
MD&lb
cc: Mike Martin, P.E.
Garreth Campbell
Keith Reinhart
Steve Topletz
Two NorthPark I 8080 Park Lane ! Suite &00 ,/ Dallas, Texas 75231 ! (214) 739-4741
May 18 O10:~;~Oa Nathan
~ENT BY: ANDANTE DEVELOPMENT; §75 414 6613; ,%lAV-~,7-01 .5;4;3Pk.~; PA~3E 3
GEOTECHNICAL EXPLORATION
OII
TOWNllOUSES OF COPPELL
Off MacArthur Boulevara
Coppeli~ Tex~z
ALPHA Report No. 00430
Prepared Eot:
C N LEMP DEVELOPMENT
G.P. for Lcmp Enterprise.~
4101 McEwen, Suite 110
Dallas, Texas 7524,$
Attention: Mr. Craig Lcmp
November 10. 2000
Prepared By:
ALPHA TESTING. INC.
2209 Wisconsin Road. Suite ! 00
Dallas, Texas 75229
M~ 18 O] O~4Oa D~than D Maier C.E. 21..473~5~61
~ENT BY: ANDANTE DEVELOP~IEI,IT; 97~ 4,14 6613; ~-,.1AY-17-01 5:42P~,.'.; PA0~ 2
ALPHA TESTING, INC.
2209 Wisconsin Sr.. Suite
O~llos. Texo~ 7..~22~
- 972/~911 - 97~2~37 (~) ~ovcmb~r ] O, 2000
FAX: q72/4~23
C N I.E~P DEVEI.OPNJENT
(~ P. for I_¢mp
4101 McF. wcn, SuHc
Dallas, 'l'¢x~ 75344
Attcn[ion: Mr, C'r~S Letup
Kc: Gcotcchnicul E~ploration
TOWNHOUSE$
Off Mac~har Boulevard
CoppcJl, Texas
ALPHA ~cpo~ No.
Attached ts thc mpon of thc ~technica] exploration perfom~ for the pl'ojuCt rc~ur~nced above.
Tins sl~dy has been au~onzcd by ~r. Crag Lcmp on October 3. ~000 and pcrtb~ed m
accordance wilh ALPHA Proposal No. GT 7668 date~ October ~. 20(}0.
Tln~ rcpo~ cont$ns
~nte~rct~lio[~ of thcsc w~lh rcspccl
have been used to develop recommendations
A[,PHA ]'ESTING, ~C. appreciates thc oppo~unity to be ~f ~e~ice on this projcc[. If we can
bc of t~nhcr assistance, such as providing materials testing sc~iccs during construction, please
contact ot[r
~ ........ ~:~%~.~ ALPHA TESTING, INC.
~. ~%~ ...... ,~ ~, ~.. .
t,f Engineering Scrvices
Hidhouse.
P~ident
DAl.~JI.H/hva
(1 ~ And~tc (Mr. Stc~e Topl~tr)
(2) Colonnade Homes {Mr. Doy, 1 ~icks)
~NT BY: ANDANTE D~VELOPMENT; ~)72 414 66131 MAY-17-O~ 5:43P~,1; PABE 6/7
ALPHA Repor~ No 00430
Texas l'riaxial <'lassificat)on {ests have not becn performed Ibr this specific project,
but ot~r previous experience wilh similar soils indicates the Texas Triaxial value
lime stabilized clay wall be about four (4) while ibc Texas Tn~ial value for naiura)
un~realed clay will ~ a~ul six (6). Using Ihe above values ~d assumin~ no~at
traffic /hr a /5-year project I, Fe, the fo~lowin8 asphallic concrete pavement s~t~ons
arc recommendS:
1. In light duxy traflic areas (up to about 100,OO0 la-Hp equivalent axle load
rcpctilions), thc pavement s~tion in parking areas can consist of at least 5
:nches of asphallic concrete composed of 3.5 inclles 0I' bill,er under 1.5 roches
of surf~e course or, lying a mechanically lime stabilized clay subgrade.
2. In heavy dui)' traffic ar~ (up lo a~ut 400,000 18-kip cquiv~ent axle load
repetitions). 6 inches of ~phaltic concrete (4.5 inches or binde~ under 1.5
roches of surface course) overlying a mechanically lime stabilized clay
subgr~c should bc ad,unit.
3.Thc co,sc aggregate in ~e surl~ce coume ~ouhl be composed of angular
co, shed limestone rather than smoolh grave/
~~.2 Portland Cement Pavement
~f' ct,,,~*cte pavement zs util~ above rccommcndcd procedure for m~h~ucal
lime stabilization (see S¢c~~ would be ~quircd. Pavement c~ th~ consis~
of 5 inches of ~e~uately reinfore~ concrete in bo~h light duty and heavy duW
areas. Theoretically. a thmn,r pavement s~tion is possible in lighl duty traffic areas;
~er, to provide adequate co,fcic cover for b~ reinforcing steel, a 5-inch thick
pavumcn~ section i~ [~quir~. Joints in concrmc paving should n~)t exceed 15 ft.
~ Allcmatcly, m~hantcal lime stabili/~lion could be eliminated by increasing thc
~ concrete fl~ickness as tbllows.
In both light duty and heavy duty tra~c areas, thc concrete thickness should
be increased by I inch to a total of 6 invhcs ifmechanical lime stabilization
the clay subgrade so~i is deleted.
~ ~' x ~ 2. Prmr tn construction of pavement on unwonted clay subgrade sod. the exposed
~O ~ ~ ~'~ subgrMe should be sc~ified to a d~th of at least 6 inches ~d compact~ to
~.'~ at least 95 % of s~andard Proctor maxim~m d~ dens~y (AS'i'M D 698) ~d
~.ithin ~hc raise of 1 perceneaae point below to ~ perc¢litag¢ points above
D ~ ~ material's optimum motstu~e content.
SENT BY: ANDANTE DEVELOP;,~ENT; §7~ 414 66i3; )~tAV-tT-011 5:43P~J; PA~E 7/7
AI.PHA Report No. 00430
6.4.3 Pav¢lllcnt Spcctlications
Pavement shotlld be spccificd, constructed alld tesled to ~'nt:t:l Ibc fi)llowing
rcqmrcmcnts:
I. l lot Mix Asphaltic Concrete: Texas SDHPT Item 340, Typ~ ~ Bass Coarse
{binder), Type D Surface Coarse.
2. Pmlland Cement Con~rctc: Texas SDI-tP'r Item 360. gpccify a minimun)
compressive s~englh oi' 3,000 lbs pet sq tach at 28 days. Concrele should be
designed w)th 5 )- I percent enlraincd
3. I.imc Stabilized Su~ade' 'l'exas SDHP'F Item 260. ~ es(]mated 6 ~rcenl
hydrated lime (by d~' soil wcighD should be applied to existing soil which hag
been scarified to a d~lh of 6 i~hcs. Thc ~lt~al amount of lime required should
be confi~ed by ~ditional laborm0ry tgsts prior to consl~ction.
a. The soil-lime mixtu~ should bc gompactcd lo at least 95 percent of
st~d~ Proctor m~Jmum dry' density (ASTM D 698) ~d within (he
range of 0 Io 4 percenlagc ~ints abovc oplimum m(nslure. The moJst,~
content of the subgr~e shm~ld be maintained until thc pavement surface is
placed,
b. In all ar~as where hydralcd lime ~a uhlizcd to stabilize ~c attbgrad~ soil,
murine ARcrb~g-limit lests should bc perfom~ pfio[ to complmion of
conslmction to ~surc the resulting plasticity index of (he soil-lime
mixtt~re will be agor b~low 15. ~dat~on, Atterberg-limits and dms~t>.
le~ts should be pcrformcd al a frequency of I test per 5000 sq l~ of
pavement.
4. Re-compacted Subgrade: ~-sile materials should be sc~ilied Io a deplh of at le~t 6
mchgs a~ vc-comp~tcd ~o al least 95 percent or ~tand~d Proctor m~mum
density (ASTM D 69g) and wi~in the range of I percentage point below to 3
pe~cntage poims above the material's oplimum moisture content. The moisture
content or' thc sub~ade should ~ mainlaincd until thc pavement surr~e is pl~cd.
Density tcsls shotdd be ~rformod al a ~equency of 1 test p~ 5000 sq R of pavemen(.
6.5 Drainage
Adcqt[a~e draillage should b~ p)'ovid~ Io fcdt~c¢ seasonal varm~ions m moisture cofllcnl
of tbtmdation ~)ils. All pavement and sidewalks within l 0 ft of thc slmetures should bc
sloped away flora the buildings to prevent ponding of water around the buildings. Final
8radcs wi~n 10 fl of the st~ctu[~ should b¢ adjustt~ to slop~ away fi'om tll¢ ~uclurcs
a* a minimum slo~ of 2 percent. ~a~l~llg po~ifive ~arta¢e aralaag{ throughout
the lift of the st~ctures is ~sen~al,