Sandy L Add L2BA-CS 960925 P.O. Box 168166 - I~g, Texas 75016-8166
Phone: 214-659-9910
Michel A. M~, E.I.T. ~x ~ ~
Assis~t Ci~ Eng~eer ~ ~ ~
Ciw of Coppell ~
P.O. Box 478
Coppell, Tex~ 75019
Re: S~dy L~e Addition Lot 2, Block A (Children F~t Academy)
De~ ~. M~M:
In accord~ce wi~ yo~ leRer of September 16, 1996 to Guille~o J~ of Dowdy ~derson &
Ass~ia~s, Inc., we hereby request a v~i~ce to ~e ciw ordM~ce requ~g 6" l~e smbil~ed
sub.de. In suppo~ of ~is v~ce reque~, we propose to pave ~e ~ea as shown on ~e plus
accordMg to ~e soils repo~ as provided by ~e H~per Group, Inc. - Geotec~ical Engineering
Consulm~ as quoted below:
"Pavemem Sub.de Prep~ation
~e l~al e~pter of~e Cons~ction Specifications Institute issued a repo~ on concrete
pavMg, ~d ~is repoa gives guidelMes for concrete pavemem ~ic~ess for differem soil ~s ...
· e repo~ reco~ends a five Mch mM~m concrete pavemem ~ic~ess for li~t ~d medi~
~c p~kMg ~e~ ~d ligM ~c ~ive ~d se~ice ~eas. Note ~at ~icker pavemems ~e
reco~ended for hcaW wa~c p~kMg ~e~ ~d medim to hcaW waffle ~ve ~d semite
Prior to placMg ~e concrete pavemen~ ~e top ~eNe Mches of sub.de soil should be
sc~ified, water added ~d recompacted. The on-site soil should be compacted to the r~ge of 95
to 100 ~rcem ASTM D698 (Smd~d Pr~to0 max~m densi~ at a mois~re contem withM
~ee percent of opt~m. ~e sub.de soil should be tested M-place for densiW ~d moisture
contem at a ~equency of one test ~r 5.000 square feet to ~s~e ~at ~e sub.de is properly
p~p~ed. ~e testMg should be ~ffo~ed wi~M fo~ ei~t ho~s of pavement cons~ction.
Concrete pavemen~ placed on ~e prep~d sub.adc should use a sub.de modulus of 100 for
· ic~ess desi~."
~ you for your consideration.
D~ Wewer
~ner