Lakeside V2-CS 96010501/06,'96 SAT 09:36 F.~X 817 429 9322 JBM Fort Worth ~]002
2630 We~r Freeway,,. 5ui~ 100, Fen Wor'.h, TX 76102 · ($17141~9-7560 * 1817~429-9322 FAX
January 5, 1996
Mr. Mike Martin, EIT
Assistant City Engineer
City of Coppell
255 Parkway Blvd,
Coppell, Texas 75019
RE: Lakesid~ Village Phase II, Kroger Store
IBM No. 94-892.00
Dear Mr. Martin:
Enclosed for your reference is the technical data I received with regard to the polyethylene storm
drain pipe that David Christopher, Inc. proposes to use for the private portion of the storm drain
system.
I have used plastic storm drain pipe on other projects, and found it to be satisfactory. The
enclosed daIa and conversations with the manufacturer's representative have convinced me that
the pipe is designed to perform properly even in the shallow cover situation encountered on this
project. I support the use of the polyethylene storm drain pipe proposed by the contractor for this
project. The Kroger Co. has agreed to accept my recommendation.
I have advised the contractor and Kroger that all my contacts and information indicate that proper
embedment and backfill are essential to proper performance of the pipe. The pipe must be
embedded properly with a granular material and carefully compacted completely around the pipe
in order to provide the necessary structural support. Compaction on the sides is especially
important. This back_fill and embedment is much more critical to the performance of the pipe than
it is for RCP.
Please feel free to contact me if you have any questions or need further information.
Sincerely,
~_',~ · - .; ~.# ~'~,',~
IBM Engineers & Planners, Inc. ~'~'~--~.',: ,,~.~ "':~'.. e ''~''~,
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{:..'.:~V-. :' .-"; ,~. -.'..~ Ag',.."~'
Crary L. Vjltery, P.E. ~ ~;,...... :,,-..a:... ..o ..:.::.-~'-, ,;'
~'-' -'. '/ %~ . ..' :1 ." .~ '.-"
Project Manager
%'.-? ~,'2;~}~ ~:-"'-.::;~'
Kansas City, Missou~/Des Moines, ]o~atecDall~s:'Fort Wor'.h/.~ustin. Texast'Green~'ille. $o~lth Carolin~iOmaha. Nebraska
p:,~adlllin,Ll~ii:~EC.~q.~L~ola/L"nex,-a,:la'beml:Dodg~ Cits'.,'lndeper~dence/Gmat Bend, Kans~s.'Rlalelah, North Carolina
01.,'06,'96 SAT 09:37 F.~I 817 429 9322 JBM Fort Worth ~003
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Hl-~$ure-~k' ~ff-Locking COMPLY: .....
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Cor~O~ e~eri=, smoot~
hy=rau~= e~=ency ~ OF PAGES INCLUDING THIS SHEET:
Ufll~ue ~nfegral ~11 Joining
wifh ~-Iockl~ creafs for ;~cure
r~oble
Avoilo~e I~ slit-tight or wote~Qbt
,election, ~~ ~~~ /
· ~u~ equipment ~n~ Ioborco,~
~ro~ to ~or hl~wOy fro~c
I~Os with only ~' of ~v~ yet
wl~tonm fills up to ~' ~eep or
L~o design life
TO GET MORE INFORMATION
IF YOU HAVE ANY 1ROUBLE RECEIVING ANY OF THE ABOVE
PAGES, PLEASE CONTACT AT . _
_. .0. . .~:;' 0.6 / 9.6._ ~.T_~09:$7 F.~ 817 429 9322 JB~i Fort Worth
2-5 MINIMUM AND MAXIMUM COVER LIMITATIONS
The des)On procedure desoribed in the prior section can be time-consuming and
may pro/Me in unnecessarily high level Df detail for many in~llations. The
information in this sect;on is designed to provide answers to cover height
quos'dons much more quickly. The ~ =amman cover height e~ncerns are
minimum oaverin trafficked areas, and maximum burial depths, Both ~-an be
considered "worst case' situations from a load perspective.
MINIMUM COVER IN TRAFFICKED APPLICATIONS
Pipe in trafficked areas IAASHT0 H20 loads) should have at learn one foot of
c~ver o/er the pipe crown, tn theo~ the pipe can be buried vv~h slightly less
cover, but application variables are such that one foot ;s the conservative limit,
The ba=kfill envelope should provide a minimum E' value of 1000 psi. In Table 2-6,
this condition is represented t)y a Class III materiel compacted to cJ0% standard
Proctor density, although other material can provide similar strength at sligh~
lower levels of eompectior~. Structural backfill material should extend six inches
over the crown of the pipe; th. remaining six inches of cover should be
appropriate for the installation. If settlement or rutting is a concern, it may be
appropriate to extend the structural backfliJ to grade. Where pavement is
involved, subbase material can be used, Section 6 provides additional information
on the bacilli envelope, how tO accommodate paving equipment loads, end
minimum cover requirements Where flotation is a concern.
Tab/e
Minimum Co~r Requirements for Hiq~P, Hi.Q Sure-Lok", 8nd ~ Duty. AASHT-O
Pipe ~a~ed on C/ass Iil gackfil/ Compacted to 9~79~ ~andard Proct~r Density and
AASHTO F12~ Load
Im~ide bJ~m~t~r, Minimem lalidi Dianmllr: IVli~immw .....
6 1 -36 I
lO I 42 1
Note: Minimum covers presented hate were cah:uJa~ed assuming a minimum o~ 6-inches of
(~ackfill material ever the pipe crow~, as recemmancled in Sectio~ 5. wJt~ an additiQ~at Mye¢ of
compacted native 9oil for a tatal cover a~ shown. In shallow trafficked installation, especially w~ere
pavement is i~volved, it may be best to us~; good qualiW com:~acted material to wade to prevent
surface easement and ruttif~[I.
MAXIMUM COVER
The soil column load was assumed in the design procedure which results in very
conservative maximum cover limits. Highway loads Rave a negligible effect in
deep burials. Maximum cover limits for Hancnr Hi-O and Hi-O Sure-Lok pipe are
shown in Table 2-7 for a variety o~ backfill condibons, Similar information for
Heavy Outy-AASHT0 pipe ia located in Table 2-8,
01,"06.,'96 SAT 09:38 F.~ 817 429 9322 JBM Fort Worth ~005
........ _ ~x -- ~. ~
7'ab/e 2-7
Max/mum Cover" for Hancor Hi.~ and H/-O Sure-Lok' Pipe (f~.!
lQ ~ ~ 79
15 ~ 45 61
42 ~ 4g
Table
~ximum Cove~' far ~ Our~$~O P;~e (~.)
.,- 3 _ ~ ..... ~ ~ . .
6 _ ~ 49
9 ~ 47
15 2g
~ Cont~t Hencor f~ ~y inst~llglions in excess of
SAT 09:35 F.~X 817 429 9322 JBM Fort ~orth ~006
~-~ F~-- ~. ~
Ins~lJJaUOns · 6-8 Hancor, loc. Drainage Handbook
Backfill Class an# Quality
E'
. PIFE EMBEDME~ ~TEB~ _. ~r
cban ~ ~. erulh~ orlv41,
- lB ~e-' ~A ~bbrcrushld l~n.
Il CM~ ~ Wa-or'dBa plv.l.
grminud IG~m ~u ~r ~ l~
GP ~iy.lredpd ora~.
SP ~dy,grmddd
SC ABy~ wefld,. ~fl~clay
fing-~pifled fine saflda, rack I~r.
CL I~g,nic clave OI ~
~gmfllc C[IyI al h~
highly org~ic mglflic I~W el~ Al ~
DH ~gJnlc cMy~ al mod;urn
PT ~ll a~ ~r high
N~: Use not recommended by ASTM 02321 for ~rT of the ~ckfill envelope.
' Refer to ~TM ~321 tar more camplem ~il agar,pt o~s.
",Jsa under the ~i~c~iafl Df a soil~ e~.