Carter Addn 3-LR130207IMEEME` FA&k\ W OW DEY, ANDERSON
& ASSOCIATES, INC.
CIVIL ENGINEERS
5125 Village Creek Drive
Suite 200
Plano, Texas 75093
972.93141694
972.931 -9538 Fax
February 7, 2013
Mike Garza, P.F.
City of Coppell
255 Parkway Boulevard
Coppell, Texas 75019
Re: Carter Addition Phase III - 22 Lots
Roadway Subgrade
Dear Mr. Garza:
I respectfully request a waiver to the City of Coppell's subdivision ordinance as it relates to
roadway subgrade requirements. The variance request is based on Sam Engineering & Testing,
L.P.'s Lime and Cement Series Test Report of Project No. 2TX813 dated February 7, 2013. The
report recommends 3% or approximately 18 Ibs of Portland Cement (Type 1) per square yard
per 8" of subgrade depth in lieu of using lime stabilized subgrade. Please let me know if you
have any questions.
Sincerely,
JCase�y R , P.E., C.F.M.
DOWDEV, ANDERSON & ASSOCIATES, INC.
State Registration No. F -399
Gec'
SAm ENGINEERING & TE,,.-;"r1NG, L.P. e
Serving The Geo-Industry Since 1974
1115 Luke Street, Suite 100
Irving, Texas 75061
Phone: (9:72) 790-1910 P FAX: (972) 790-0967
LIME & CEMENT SERIES TEST REPORT
2/712013 SAMPLE DATE, 2/5/200
CLIENT: Toll Brothers/Papagolos Dev, PROJECT NO,.: 2TXBK13
5225 Village Creek Dr., #300
Plano, Texas 75093 REPORT NO.,: 25
PROJECT: Proposed Carter Addition Ph-3 METHOD OF TEST, ASTM D-4972/4318 &
Carter Drive N. C. T: C. 0 . G , 4,6.1
Coppell , Texas
PAGE I OF I
ATTN: John Papagolos SE&T TECHNICIAN: Dusty McClendon &
Mathew Varuqhese
SAM Engineering & Testing, L.P. performed the following lime & cement testing services:
1. Performed a lime series test on a bulk sampie obtained from-. (A) consisting of reddish yeilow mottled light gray silty CLAY
with some/much fine sand & trace of F,M.C. river gravel. (6) consisting of dark & light brown mottled light gray silty CLAY
with some/much fine sand & trace of F.M.C. river gravel. The following results were obtained:
A) • Initial: LL = 34 PI = 18 USCS = CL B) - initial: ILL = 28 Pl:= 13 USCS = CL
LIME - +2% Lime: LL = 37 PI = 14 USCS = CL LIME . +2% Lime: LL = 29 PI = 9 USCS = CL-ML
. +4% Lime: LL = 36 PI = 10 USCS = CL • +4% Lime: LL = 30 PI = 6 USCS := ML
- +6% Lime: ILL = 34 PI = 4 USCS = ML
C) - Initial:
LL = 33
M = 17
USCS = CL
D) . Initial: LL = 28
PI = 13
USCS = CL
CEMENT - +2% Cement:
LL = 34
PI = 14
USCS = CL
CEMENT - +2% Cement: LL = 27'
Pi = 10
USCS = CL
+3% Cement:
LL = 33
PI=10
USCS=CL
0+3% Cement: LL=:29
PI! =9
USCS =CL
+4% Cement:
ILL = 33
PI = 7
USCS = CL
. +4% Cement.- LL = 30
PI = 4
USCS = CL
Z Based on the above data and our experience, a 2% or approximately 12 lbs, of lime per square yard per 8" depth is
considered suitable to reduce the subgrade soils to less than 15% as required by the N.C,T,C.Ol.G.4.6. 1.
3. Based on the above data and our experience, a 3% or approximately 18 lbs of Portland Cement (Type 1) per square yard per
8" depth is considered suitable to reduce the subgrade soils to less than 15,% as required by the N,C,T.C.0.G.4,6, 1 .
4. Due to low PI & sandy nature of the tested subgrade soils, adding lime will not be beneficial as lime is only effective in
reducing the PI of soils. Therefore, we strongly recommend the addition of 3% Portland Cement (Type 1) or 18 lb& of
cement per square yard per 8" depth, This will result in better stabilized subgrad:e under the proposed pavement,
4p
Very Truly Yours,
Sadik (SAM) All-Musawe, M.Sc Ph.D.s P.E., D,GE,, F.ASCE
F,
Civil & Environmental Engineer F
Vh,
7
Texas Registration Number 6189'3
Texas Professional Firm Registration Number-, F-001587
This report is for the sole use of the client addressed. The use of our company name must receive prior
141it" , .1 1
This report applies only to the sample tested and does not necessarily represent identical or similar sampies.
G12013/2N9ki 3/LumeSeries/LirreCementSeries25