Villas of SW-LR140217 �)GeoScience
February 17, 2014
Hampi LP.
1916 Cottonwood Valley Circle S
Irving, Texas 75038
RE: Lime Series Test Results
Proposed "Villas of Southwestern"
272 Southwestern Blvd
Coppell, Texas
On February 10,2014, a GETI Technician obtained two (2) soil samples from the exposed surface of the
graded proposed Streets to undergo a Lime Series testing program on the soil sample determined to
have the highest plasticity index.
The results of the Lime Series Tests are as follows:
Sample Location: Exposed surface of the graded proposed Streets at the referenced project site
Sample Description: Brown and Tan Clay
PERCENT LIME ADDED
0 4 6 8
Liquid Limit 63 53 48 47
Plastic Limit 24 29 33 34
Plasticity Index 39 24 15 13
Based on the laboratory test results, the optimum lime additive contents for soil stabilization where
the plasticity Index reduces to 15, is approximately 6 percent of the dry weight of the soil. However,
Geoscience recommends adding 7.5 percent of dry weight of the soils at a minimum application rate of
approximately 32 pounds of hydrated lime per square yard for 6-inch subgrade thickness. Specifications
2712 Satsuma Drive,Suite 400*Dallas,Texas 75229♦ 972.488.3500(P)*e-mail:eeti @sbcglobal.net
Lime Series Test Results
Proposed Villas of Southwestern"
272 Southwestern Blvd
Coppetl,Texas
by the City of Coppell for mixing and application of lime should be adopted, however, in the event that
the city does not have any set procedures, the following procedures should be used:
• Application
The hydrated lime should be applied only in the area where the first mixing operations can be
completed during the same working day.
The hydrated lime should be placed by the slurry method. The hydrated lime should be mixed with
water in trucks or tanks and applied as a thin water suspension or slurry. The distributor truck or tank
should be equipped with an agitator that will keep the time and water in a uniform mixture. By
calculating the number of square yards in each area and by knowing the amounts per truckload, the
rate of application can be checked very closely.
• Mixing
The material and hydrated lime should be thoroughly mixed by a rotary mixer or other device to obtain
a homogeneous, friable mixture of material and lime free from all clods or lumps and left to cure from
one to four days. From our experience, we have found that a curing period of 48 to 72 hours is
adequate. During the curing period, the material should be kept moist.
• Final Mixing
After the required curing time, the material should be uniformly mixed with a rotary mixer capable of
reducing the size of the particles so that when all non-slaking aggregates (asphalt particles) retained
on the No. 4 sieve are removed, the remainder of the material shall meet the following requirements
when tested dry by laboratory sieves:
Minimum passing 1-3/4"sieve — 100%
Minimum passing No. 4 sieve — 60%
During the interval of time between applications and mixing, the hydrated lime should not be exposed
to the open air for a period of over six hours.
• Compaction
Compaction of the mixture should begin immediately after final mixing, and in no case later than three
calendar days after final mixing. The material should be aerated or sprinkled as necessary to provide
the optimum moisture. Compaction should begin at the bottom and continue until the entire depth of
Geoscience Inc.
Lime Series Test Results
Pro[Med'Villas of Southwestern'
272 Southwestern Bled
Coppell,Texas
mixture is uniformly compacted. All irregularities, depressions, or weak spots which cevetop must be
corrected immediately by scarifying the areas affected, adding or removing material, and reshaping
and recompacting by sprinkling and rolling. The surface should be maintained in a smooth condition—
free from undulations and ruts.
The subgrade should be compacted to a minimum of 95 percent cf Stardard Pro'-tor .!=nsity (ASTM D
698), at moisture content within 4 percentage points of optimum moisture content "nmpaction add
moisture checks should be taken within all paving areas at the rate of one field density test ner lift,
per each 2,500 square feet. These tests are necessary to determine if the recommended moisture and
compaction requirements have been attained. After the required compaction is reached, the subgrade
should be brought to the required lines and grades and finished by rolling with a pneumatic tire or
other suitable rollers sufficiently tight to prevent hair tine cracks.
We trust the information provided is sufficient for your present use please feel free to contact us with
any further questions or if you requi-e any additional information.
Respectfutty,
Geoscience Engl.-leering/4'i esting, Inc.
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