HomeMy WebLinkAboutLand Tech Engineer Report Stagecoach Hills Report 09-2012 ` G45otechnical F Environmental Engineering
Construction Materials Testing
EIS inEErs Laboratory Testing
September 7, 2012
Mr. Jarrod Greenwood
Town of Westlake
3 Village Circle, Suite 202
Westlake, Texas 76262
RE: Stagecoach lolls Streets — Town of Westlake
Dear Jarrod:
In accordance with your request, LandTec Engineers has prepared the following
report of our assessment of the pavement cracks on several of the streets in
Stagecoach Hills, Town of Westlake, Texas. The report includes results of our
observations, core samples, borings, tests, consultation with an independent
pavement expert, recommendations, and options for repair of the pavement
cracks and timing for repair.
Section 1.0 of the report presents a brief summary of the street construction
project, climate conditions, pavement cracking, cause of the cracking, and repair
options.
Section 2.0 of the report includes technical information on the core samples and
tests performed, as well as our observations, meetings, etc.
Section 3.0 includes information provided by the consultants, monitoring
recommendations, repair options and recommendations for remediation of the
pavement cracks.
LANDTr=C ENGINEERS, LLC 1700 Robert Road Suite 101 Mansfield,Texas 76063 817.572.2818 Fax 817.453.9984
1.0 Report Summary
The following is a brief overview of the Stagecoach Hills pavement project
including background, existing conditions, assessment of the pavement cracks,
and repair recommendations. Please see the other sections of this report for
specifics.
Prior to recent construction, the pavement in Stagecoach Hills consisted of
approximately 1 to 3 inches of asphalt pavement supported by approximately 2 to
8 inches of sand and gravel base material. This pavement section is fairly typical
for residential streets installed in the early 1970's.
The new pavement section in Stagecoach Hills typically consists of 4 inches of
asphalt pavement placed on an 8 inch thick layer of base material prepared by
rotary mixing the old original asphalt pavement and underlying sandy gravel base
with approximately 40 pounds of Portland cement per square yard to bind the
materials together. In the pavement construction industry this process is termed
Full Depth Reclamation or FDR.
Rather than remove and haul off the old asphalt pavement and base material, a
heavy duty re-claimer mixing machine was used to mix the existing asphalt
pavement and underlying base material. The mix of asphalt and base was then
mixed with cement and compacted. This is a common approach to reworking old
asphalt pavements to make good quality base to support new asphalt pavement.
FDR is used all over North Texas by Cities and Counties, the State of Texas, as
well as surrounding states.
The FDR method recycles the materials; no need to haul in aggregate or haul out
old materials for stockpiling or disposal. Typically there is no need for detours
since FDR can be accomplished under traffic, making the process more
convenient for local residents. At least one lane of traffic is open at all times.
Construction of the streets began in early April and was completed in late April,
2012, Weather conditions prior to April included cool to warm days with
temperatures ranging from the low 60's to the mid 80's. A few rain showers
occurred in April and the overall ground conditions were moist from rains in late
2011 and early 2012.
9745 Stagecoach Hills-Sept2012.doc 2 LANDTEC ENGINEERS
May was progressivel�r wanner with less rain and the temperature hitting 95
degrees on May 25t . By June the weather was hot, with some days
approaching the raid to upper 90's and the temperature hit 100 degrees on the
June 24th. June was a hot, dry month. July was also hot and dry with many days
of 100 degrees or snore. In summary, by the end of May and first of June, the
weather conditions suddenly changed to a hot and dry climate. This quick
change in climate caused drying of the subsurface soils.
On June 18, 2012 we were asked by Westlake and Graham Associates to meet
with the contractor Peachtree Construction on Janet Court to observe cracks in
the cul-de-sac. Cracks were observed within the asphalt between the fire
hydrant and the valve box, at the far west end of the court. This is also the
general location of a water line placed last year. On June 19, 2012 we returned
to Janet Court to perform two cores within the crack along the north side of the
cul-de-sac.
On July 11, 2012 new cracks were observed in Janet Court and along Thornton
Drive. At this time additional cores of the asphalt and base material were made
on these two streets. Boil borings were also taken on this date.
Observations made at the time the cores were taken indicated the cracks in the
pavement extended not only through the asphalt and base material, but also
deep into the subsurface soils well below the new pavement construction depth.
Our observations indicate the cracks opened in the pavement due to dry
climate conditions starting in May and continuing in June- 2012, causi_ nc,�the
gr_oun i'adjacent fo the street to dry out and shrink, putting tension on the soil
below the pavemen and within the pavement itself. The pavement cracks
rd-s�pond-e-dTo-Ifie-raih even s-be�een X(A ust 14 arid 18, and stopped increasing
in width, and in some cases closed by approximately 30 to 50 percent as
observed on August 21, 2012.
Per the request of the Town of Westlake, Graham Associates and LandTec
Engineers were asked to consult with an outside pavement expert. The name
and resume of Mr. Lawrence Kelly, P.E,, President of TQD Group was provided
to Graham Associates for review. Mr. Kelly has over 30 years' experience as an
engineer and manager with the Texas Department of Transportation (TxDOT) in
the Dallas and Fort Worth Districts, and also has many years in private practice
on major roadway and paving projects throughout the Dallas-Fort Worth area.
1745 Stagecoach Hills-Sept2012.doc 3 LANDTEC (ENGINEGR5
Mr. Kelly has observed the pavement cracking in Stagecoach Hills, discussed the
paving project with Peachtree Construction, Graham and LandTec, reviewed test
data, and attended the meeting at Town Hall on August 14, 2012. He has
concluded, and as stated in the meeting, that the asphalt street has been
constructed properly and is appropriate for the residential streets.
In his opinion the pavement cracks are the result of historic drought conditions
we are experiencing. He has observed this same cracking situation in many cities
and towns in North Texas. The soils are drier to deeper depths than we have
experienced over the past 30 years.
He also recommended that the cracks be monitored for at least 30 to 60 days
and let "seasonal weather" run its course. He suggested that we monitor the
cracks about every other week to determine the response of the cracks with
climatic conditions. In October he said that a final recommendation as to how to
best repair the cracks can be made.
Repair work should not be initiated until the crack monitoring is complete, which
will be approximately October 2012. Some adjustments within the crack repair
procedures may be made based on the monitoring work.
Options for repair of the larger pavement cracks include removal of a section of
the asphalt pavement along the crack with a milling machine; seal the crack
below the asphalt and within the subgrade soils using cement grout or another
type of material. A strip of elastomeric material would then be placed followed by
new Type D asphalt. Following repair of the larger cracks, portions of the
cracked area can be overlain by Plant Mix Seal, which is a thin layer of asphalt
that will cover repairs of the larger cracks as well as cover and seal the smaller
cracks.
An asphalt "rejuvenator" consisting of a sprayed on liquid application can be used
to make cosmetic repairs. The material basically seals the surface of the asphalt
and provides a consistent color to the surface.
4745 Stagecoach Hills-Sept2012.doc 4 LANDTEC ENGINEERS
200 Field Teats, laboratory Tests and Observations
On June 18, 2012 we were asked by Westlake and Graham Associates to meet
with the contractor Shawn Rieger with Peachtree Construction on Janet Court to
observe cracks in the cul-de-sac. Cracks were observed within the asphalt
between the fire hydrant and the valve box, at the far west end of the court. This
is also the general location of a water line placed last year.
On June 19, 2012 we returned to Janet Court to perform two cores within the
crack along the north side of the cul-de-sac. These two cores are identified as C-
1 and C-2. The asphalt pavement was found to consist of Type D, surface
course mix and Type B, base course mix. A total thickness of 4 to 4-1f4 inches
was measured at the two locations cored.
Results of the cores and a brief report were submitted on June 26, 2012. The
cracks were found to go through the 4 inches of asphalt, the 8 inches of base
material and to at least 3 feet below the top of pavement, indicating deep
shrinkage cracking. We recommended the cracks be sealed. On this date we
also drove over to Aspen Lane. We did not observe any cracks. Aspen Lane
was reconstructed in the summer of 2011 using the same pavement construction
procedures and thickness.
July 6, 2012: Met with Jarrod, Brian Avirett and Shawn Rieger on Janet Ct. and
Thornton Drive to observe the cracks. At this time, it was decided to perform
additional cores on Janet Ct. and Thornton.
On this date we also drove over to Mahotea Boone and cracks were discovered
in the asphalt today east and west of the top of the hill. Jarrod indicated a few
weeks prior to July 6, when they were installing a fire hydrant, there were no
cracks in the street. The street was reconstructed during the summer of 2011.
On July 11, 2012 additional cores of the asphalt and base material (CTB) were
made on Janet Court and Thornton Drive. Soil borings were also made on this
date with a truck mounted drill rig. The cores and borings made on this date are
identified as C-3 through C-11. Cores C-3 through C-7 was taken on the cul-de-
sac portion of Janet Court (approximately 5923 Janet Court). Cores C-8 and C-9
were made on the east end of Janet Court (approximately 5937 Janet Court).
Cores C-10 and C-11 were made on Thornton Drive just south of the Janet Court
intersection (approximately 13308 Thornton).
1745 Stagecoach Hills-Sept2012.doc 5 LANDTEC ENGINEERS
Soil samples were obtained with the drill rig in core locations C-5, C-6, C-7 and
C-3. Selected representative samples were tested for plasticity index, moisture
content, unit dry weight, unconfined compressive strength and swell. Samples of
the asphalt and Cement Treated Base (CTB) were tested for various physical
properties.
The cracks extend much deeper below the bottom of the base material. A thin
wire was used to push into the crack below the cement treated base, and the
crack extended as far as the wire was in length, approximately 24 inches.
Counting the pavement thickness of 12 inches plus the 24 inches, the crack is at
least 36 inches or more in depth.
Cracks were present within the old asphalt. Since the cracks developed over a
long timeframe and opened and closed seasonally with loose asphalt and sand
filling in the crack at the surface, they were probably not as pronounced. Cracks
are over 3 feet deep, and probably as deep as 5 to 10 feet. Tree roots were
found in the borings and moisture is being pulled out of the street subgrade by
the trees.
Soils encountered in the borings consisted of all types of soils. Expansive and
non-expansive soils are present within the development and underlie the streets.
Boring logs for each core and boring are attached in Appendix A.
Tree roots were found in several of the borings that were drilled in the street,
confirming the roots are reaching out to find moisture below the street, especially
where trees are not receiving water on non-irrigated lots within the subdivision.
Core samples of the CTB were obtained in several locations. Unconfined
compressive strength tests performed on the core samples indicate strengths
ranging from 230 psi to 650 psi with an average of 430 psi. The desired range is
250 psi to 800 psi per TxDOT. Therefore, the CTB has adequate range in
strength based on the test data.
Based on the results of the cores, borings, laboratory tests, etc. we revisited the
original pavement design calculations and have determined that the structural
integrity and design life of the asphalt and base material has not been
compromised by the cracks within the pavement and underlying soils. The
pavement remains a 20 year plus pavement section, as designed.
1745 Stagecoach Hills-Sept2012.doc 6 CANDIFEC ENGINEERS
The more pronounced cracks are located on Janet Court within the cul-de-sac at
address 5928; approximately 5937 Janet Court, which is the east end of Janet
near Thornton; and on the east side of Thornton near address 13308. In each of
the three locations the crack extends to depths greater than 5 feet. The area of
cracking on Thornton has relatively sandy soils. Janet Court has shallow
expansive clays on the west end.
August 2, 2012: Observed and measured cracks in Janet Ct. and Thornton.
Cracks were not observed within the asphalt pavement on Stagecoach Circle,
the section of Thornton from Stagecoach to just south of 13308 Thornton, and
Steve Court (except for two smalls cracks on the west end) on August 2, 2012.
Steve Court has shallow expansive soils on the west end and sandy soils on top
of the hill. Shallow expansive clays are present on Stagecoach Circle and the
south end of Thornton.
August 13, 2012: Conference call with Jarrod and Jeff to discuss current
observations, causes and recommendations.
August 14, 2012: Meeting at Town Hall with Tom Brymer, Jarrod Greenwood,
Joseph Lopez, Jeff Williams, Tom Baker, Lawrence Kelly and Roderick Wisham.
Discuss observations, tests, and reasons for cracks, solutions, options and
timing.
August 21, 2012: After more than a month without rain and many days with
temperatures above 100 degrees, Stagecoach Hills received rain on Tuesday
night August 14; Friday night August 17 and again on Saturday night the 18th.
The total rainfall was between approximately 3 and 4.5 inches in the general
area. Observations on Tuesday August 21 revealed some of the cracks were
already closing on Janet Court and Thornton Drive due to moisture increase
along edge of the street and in lawns.
The crack on Janet Court, Core Location #2, was measured to be three-quarters
(314) inch wide on July 11. On August 21 (after the rain) the crack is three-eight's
(318) inch to one-half (112) inch wide, closing approximately 30 to 50 percent.
The cracks closed about as quickly as they opened. However, if the climate
returns to hot and dry conditions, the cracks should be expected to reopen.
The larger crack on Janet Court and Thornton Drive are unusual and appear to
be different than typical reflective cracking. The crack on Janet Court generally
follows the water line and the larger crack on Thornton is in the same location
where in the past (about 2007) a fairly significant repair was made to the street
1745 Stagecoach Hills-Sept2012.doc 7 LANDTEC ENGINEERS
(as see in Googfe Earth). Both these cracks are not normal cracks and
something other than dry weather shrinkage cracking may be occurring. An
excavation may have been made in the street and may not have been backfilled
and compacted properly. The excavation could have been associated with a
utility line repair or some other type of subsurface occurrence such as a septic
tank lateral field.
Basically the cracks opened in the pavement due to hot, dry climate conditions
starting in May and continuing in June 2012, causing the ground adjacent to the
street to dry out and shrink, putting tension on the soil below the pavement and
within the pavement itself. The pavement cracks responded to the rain events
between August 14 and 18, and stopped increasing in width, and in some cases
they closed in width by approximately 30 to 50 percent as observed on August
21, 2012.
Roanoke Road, between State Highway 170 and the Roanoke City Limit (about
800 linear feet) was reconstructed in late June and early July 2012 by Peachtree
using the same construction procedure, and cracks have not appeared in the
asphalt surface as of August 21, 2012. This could be due to the fact that the
ground around and below the street was already dry when construction took
place.
North Texas cities are suffering through the hot dry summers with cracked
pavements. We have photos of pavements in Southlake (White Chapel Road
and FM 1709); Mansfield (Walnut Creek); Argyle, Fort Worth, and many other
roads in the Dallas-Fort Worth area with cracked asphalt pavement.
Several streets in Westlake are undergoing cracking due to the hot, dry weather
including Roanoke Road, just north of the entrance to Stagecoach Hills and the
section between the corporate office and Hwy 170; Ottinger Road adjacent to
Westlake Academy within the new section of asphalt pavement; and along
Ottinger north of the Westlake Academy entrance to the left hand curve (headed
north).
1745 Stagecoach Hills-Sept2012.doc 8 LANDTEC ENGINEERS
3.0 Recommendations, Repaor Options and Tuning
In accordance with your request to consult with a pavement expert, we provided
the name and resume of Mr. Lawrence Kelly, P.E., and President of TQD Group
to Graham Associates for review. Mr. Kelly has over 30 years of extensive
experience as an engineer and manager with the Texas Department of
Transportation (TxDOT) in the Dallas and Foil Worth Districts, and also has
marry years in private practice on major roadway and paving projects throughout
the Dallas-Fort Worth area. Upon Graham Associates review of Mr. Kelly's
resume, he was invited to attend the meeting in Westlake on August 14, 2012 at
Town Hall with Tom Brymer, Jarrod Greenwood, Joseph Lopez, Jeff Williams,
Tom Baker, Lawrence Kelly and Roderick Wisham.
Mr. Kelly has observed the pavement cracking and reviewed the core tests
results. He has concluded, and as stated in the meeting, that the street
pavement section has been constructed properly and is appropriate for the
residential streets. In his opinion the pavement cracks are the result of historic
drought conditions we are experiencing and he has observed this same situation
in many cities and towns in North Texas. We have not seen the soils this dry to
these deep depths in our experience over the past 25 to 30 years.
The historic drought conditions have caused the subsurface soils to undergo
extreme loss of moisture with deep drying and contraction of the soil, in some
cases to depths of 5 feet and often to depths of 10 feet or more. Loss of soil
moisture causes shrinkage of the soil mass, therefore creating deep cracks
within the ground. These cracks are reflected up into the ground surface and
through pavement. Little can be done to eliminate these deep seated shrinkage
cracks. This is especially true where trees near the street are in search of
moisture and extend their roots to distances of one to two times the tree height,
pulling moisture out of the pavement subgrade soils.
One of the suggestions made by Mr. Kelly during the meeting involved filling the
larger cracks with water from a water truck or fire hose to see if the cracks close.
We reported our "after the rain" observations to Mr. Kelly on August 24, 2012,
and the fact that some of the cracks were partially closing due to the rainfall
events. He indicated that his idea of filling the cracks with water did not need to
be done now, since the rain proved that the cracks are caused by the drought.
He further recommended not repairing the cracks, but, rather waiting and
monitoring the cracks for at least 30 to 60 days and let "seasonal weather" run its
course. He suggested that we continue to monitor about every other week to
1745 Stagecoach Hills-Sept2012.doc 9 Ls4NDTEC ENGINEERS
determine the response of the cracks. A final recommendation for repair of the
cracks can be made in October 2012.
The following information was discussed in the August 14th meeting.
We plan to monitor the more pronounced cracks on a twice per month basis to
determine the progression of the crack longitudinally along the street and the
width of the crack. The purpose is to determine whether the cracks are
increasing or decreasing in width as the soil moisture conditions change from dry
to moist and vice versa. Following the monitoring in September and early
October 2012, we will recommend a time to repair the cracks and the method(s).
Options for repair of the larger pavement cracks include the following.
1 . Remove a section of the asphalt pavement along the crack with a small
hand operated milling machine that removes approximately 12 inches of
pavement width and to the full depth of asphalt. The crack would need to be
sealed below the asphalt and within the subgrade soils using cement grout or
another type of material. A strip of elastomeric material would then be placed
followed by new Type D asphalt. Bather than using a grout to fill the crack, a
backer rod material can be used, depending on the width of the crack and
available sizes of backer rod material.
2. Following repair of the larger cracks as suggested in Item #1, portions of
the cracked area can be overlain by Plant Mix Seal, which is a thin layer of
asphalt that will cover repairs of the larger cracks as well as cover and seal
the smaller cracks.
3. Repair work should not be initiated until the crack monitoring is complete,
which will be approximately the end of September to mid October 2012.
Some adjustments within the crack repair procedures may be made based on
the monitoring work.
4. An asphalt "rejuvenator" consisting of a sprayed on liquid application can
be used to make cosmetic repairs. The material basically seals the surface of
the asphalt and provides a consistent color to the surface.
It is important to preserve the asphalt pavement and to catch deterioration early
and preserve the pavement to limit the amount of damage from environmental
causes including drought conditions, UV light rays and extended periods of
excessive heat. Preserving the asphalt involves crack sealing to seal water out
of the larger cracks, spot seals, strip seal coats such as Plant Mix Seals, and
rejuvenation material applications. Any emulsion seal should have good
adhesion and durability properties.
1745 Stagecoach Hills-Sept2012.doc 10 LANDTCC ENGINEERS
A minimum of two pavement assessments should be conducted each year, one
in the fall and one in the spring. This procedure will allow early detection of
defects and correction while the defects are still minor and before they cause
pavement failure. The assessments will identify the overall condition of the
asphalt and locations were spot repairs are needed. A sealer should be applied
about every five years to slow the rate of loss of oils from the asphalt due to UV
and heat exposure. Sealing will also limit the loss of oils due to penetration of
moisture into the asphalt and will help maintain the asphalts flexibility. Before
applying the sealer, any cracks within the asphalt should be cleaned and sealed
to prevent intrusion of surface water into the base and subgrade soils.
We have taken hundreds of photos during June, July and August 2012 and can
provide them to you on a CID, if you so desire.
The following information is attached and completes this report.
Attachment A - Boring Logs
Attachment B —Test Results
Attachment C — Photos of Core & Boring Locations
Attachment D — Notes and Conditions
If you have any questions or comments, please let us know.
Sincerely,
LANDTEC eN GENEMS, LLC
OF
7H D. MKER
.......11
400M
Thomas D. Baker, P.E., RPLS
TBPE Firm No. F-000329 TBPLS Firm No. 100956-00
Distribution: Above (pdf)
1745 Stagecoach Hills-Sept2012.doc 1 LAND EC ENGINEERS
ATTACHMENT A
(See Photo's in Attachment C for Locations)
Project: Stagecoach Hills
Westlake,Texas BORING LOG
C-01
Project Number: 1745
Sheet 1 of 1
LID Location: See Plan of Borings
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MATERIAL DESCRIPTION
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Date: 6119112 hand angered to 3 feet.
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stratification ivies represent the approximate boundary between soil types and the transition cart he gradual.
Project: Stagecoach Hills
Westlake,Texas BORING LOG
C_(}2
Project Number: 1745
Sheet 1 of 1
Location: See Plan of Borings
Surface El.:Top of Pavement a 0 v
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MATERIAL DESCRIPTION
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Date: 6119/12
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IANDTEC Soil and rock descriptions on this boring log are a con>pliation of data collected in both the field and the laboratory.Ille FIGURE
stratification lines represent the approximate boundary between soil types and the transition can be gradual.
Project: Stagecoach Hills
Westlake,Texas BORING LOG
C-03
Project Number: 1745
Sheet 1 of 1
Location: See Plan of Borings
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MATERIAL DESCRIPTION
4"HMAC&8"Cement Treated Base
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U2 4.5+ 10.0 113.1 15 10 5 27 1.7
U3 4.0 13.6 104.7 30 17 13 44 1.1
3.0
CLAYEY SAND,silty,brown,stiff whron ore
U4 particles&roots&w/sandy lean clay seams 4.0 15.4 98.0 39 19 20 49 0.9
4.0
CLAY,tan,stiff,dry w/roots
U5 3.5 16.3 115.9 56 21 35 91 1.9
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Date: 7/11/12
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LANDTEC Soil and rock descriptions on this boring log are a compliation of data collected in both the field and the laboratory. The FIGURE A3
stratification lanes represent the approximate boundary between soil types and the transition can be gradual.
Project: Stagecoach Hills
Westlake,Texas BORING LOG
C-04
Project.Number: 1745 Sheet 1 of 1
�, Location: See Plan of Borings x 0
Surface El.-. Top of Pavement o o °o o '�° �•a) y
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6 Date: 7111112
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LMDTEC Soil and rock dcscriptions on this boring log area compliation of data collected in both the field and the laboratory. ne FIGURE A4
stratification lines represent the approximate boundary between soil types and the transition can be gradual.
Project: Stagecoach Hills
Westlake,Texas BORING LOG
C-05
Project Number: 1745
Sheet 1 of i
r10 Location: See Plan of Borings x
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Surface El.: Top of Pavement o o w y
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MATERIAL DESCRIPTION
4"HMAC&8"Cement Treated Base
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o Date: 7/11/12
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LANOTEC Soil and rock descriptions on this boring log are a compliation of data collected in loth the field and the laboratory. The FIGURE A5
slrasification lines represent the approximate boundary between soil types and the transition can be gradual.
Project: Stagecoach Hills
Westlake,Texas BORING LOG
C-a6
Project Number: 1745 Sheet 1 of I
Location: See Plan of Borings ><
Surface El.:Top of Pavement a o o
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MATERIAL DESCRIPTION
4"HMAC&8"Cement Treated Base
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U2 4.5+
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Date: 7111/12
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LMDTK Soil and rock descriptions on this boring log are a comphatien of data collected in both the field and the laboratory.The FIGURE A6
stiralifioation lines represent the approximate boundary between soil types and the transition can be gmdual.
Project: Stagecoach Hills
Westlake,Texas BORING LOG
C-07
Project Number: 1745
Sheet 1 of 1
Location: See Plan of Borings y ;
Surface El.:Top of Pavement o 2 0 P 9 A i
CV
Gi. O fly "' G3 o •0 ,�', Lk P,
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MATERIAL DESCRIPTION
3 3/4" HMAC&8 1/4"Cement Treated Base
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SANDY LEAN CLAY,brown,very stiff,dly
U2 w/gravel&pieces of asphalt(POSSIBLE.FILL) 4.5+ 5.3 91.5 1.2
U3 4.0 9.7 98.7 35 13 22 72 1.0
U4 . 3.5 4.0
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o Completion Depth: 3.5 ft Remarks: 5928 Janet Court.
0 Date: 7/11/12
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0
b
oTec Soil and rock descriptions on this boring log are a compliation of data collected in both the field and the laboratory.'Me FIGURE A7
stratification lines represent the approximate boundary between soil types and the dansition can be gradual.
Project: Stagecoach Hills
Westlake,Texas 1ROPJ TG LOG
C-08
Project Number: 1745
Sheet 1 of 1
Location: See Flan of Borings
Surface El.: Top of Pavement o 0 0 4 'gip y 4.
U3 0 o P�° °gin
w a�i o
E o-ui U
o O
A � �"CQ � U
MATERIAL DESCRIPTION x
3 1/2"HMAC&8 1/2"Cement Treated Base
C1
1.0
SAND,silly,brown,dry w/crack running
U2. through sample 4.6 15
U3 2.5
SANDY LEAN CLAY&clayey sand,tan, 4.5 5.5
stiff,dry w/lean clay seams w/roots
U4 4.0 13.1 100.3 23 12 11 47 0.5
U5 3.5 117
5
U6 4.0
6.0
N
10
V
H
J
a
C'7
J
.a
X
x
O
CW7
Q
a
n_
J
C7
� 15
o Completion Depth: 6 tt Remarks: 5937 Janet Court. Drilled over crack in pavement,wire
Date: 7111/12 goes down into crack 3+feet.
0
m
IANDTEC Soil and rock descriptions on this boring log are a compliatiou of data collected in both the field and the laboratory.The FIGURE A8
stratification lines represent the approximate boundary between soil types and the transition can be gradual.
Project: Stagecoach Hills
Westlake, Texas BORING LOG
C-09
Project Number: 1745
Sheet 1 of 1
Location: See Plan of Borings ;
Surface EL Top of Pavement o 0 0 �� � � � �.� 0 y
� b 'mow A 'g 3w 01 H
CD
P.cn P. moo ° A U
Go Z
MATERIAL DESCRIPTION
4 1/8"HMAC&8"Cement Treated Base
Cl
1.0
5
N
N
a 10
r
U
H
p
d
a
vi
S
U
Q
U
W
C7
F
vi
M1
{r7.
3 15
a Completion Depth: 1 ft Remarks: 5937 Janet Court;pavement core taken 5 ft. south of C-8.
Date: 7/11112
fl
as -
LANDTEC Soil and rock descriptions on this boring log are a compliation of data collected in both the field and the laboratory, the FIGURE A9
stratification lines represent the approximate boundary between soil types and the transition can be gradual.
Project: Stagecoach Hills
Westlake,Texas BODING LOG
C-10
Project Number: 1745 sheet 1 of 1
Ln Location: See Plan of Borings X
U cut
Surface El.: Top of Pavement 4 4 a _
a . O �p3 Q a tea°
o ar o o ci p.., o
vV A �
o N U .
a z
MATERIAL DESCRIPTION
C1 3 118"HMAC(1 1121'D&1 518"B) 03
5
�.
10—
t~
A
t7
U
O
U
U
F
fa
15
o Completion Depth: 0.3 ft Remarks. 13308 Thornton. Cored over crack in pavement,wire goes
0 Date: 7/11112 down into crack 3-r feet.
0
m
LANDTEC Soil and rock descriptions on this boring log are a compliation of data collected in both the field and the laboratory.The FIGURE A 10
stratification lines represent the approximate boundary between soil types and thetrrrsitinn can be gradual.
Project: Stagecoach Hills
Westlake,Texas BORING LOG
C--11
Project Dumber: 1745 Sheet 1 of l
Un Location: See Plan of Borings 9
Surface El.:Top of Pavement c 0 0 0 y
MATERIAL DESCRIPTION x
C1 3 3/8"HMAC(1 7/8"B&1 112"D) 0_3
5
N
F-
R
a.
V
H
x
U
4
U
F
a
C7
15
0 Completion Depth: 0.3 ft Remarks: 13308 Thornton. Core is taken 3 ft.west of C-10.
Date: 7/11/12
a
ca
LMDTEC Soil and rock descriptions on this boring log are a compliation of data collected in both the field and the laboratory. The FIGURE A11
stratification lines represent the approximate boundary between soil types and the transition can be gradual.
The following Table presents a summary of the pavement section encountered in
the core samples and borings.
Table 1
Summary of Existing Pavement Conditions
Core Asphalt Base Total
No. Section Section Thickness
2.0"Type D 8.5" Cement
1 2.0"Type B Treated Base 12.5"
Total =4.0" (CTB)
2.0"Type D
2 2.25"Type B 8.0" CTB 12.25„
Total =4.25'
2.20"Type D
3 1.72"Type B 8.1" CTB 12.01"
Total= 3.92"
4, 5
and 6
1.76" Type D
7 2.01" Type B 8.25" CTB 12.02"
Total = 3.77"
8
1.83 ° Type D
9 2.30 " Type B 8.15"CTB 12.28"
Total=4.13"
1.50 " Type D See Asphalt
10 1.63" Type B CTB Not cored
Section
Total = 3.13"
1.88" Type D See Asphalt
1.1 1.50" Type B CTB Not Cored Section
Total = 3.38"
*Drilled through the pavement section with truck drill rig and no cores taken at these
locations. Already had core samples from adjacent hole.
1745 Stagecoach Hills-Sept2012.doc B-1 L4NDTEC ENGINEERS
SUMMARY OF RESULTS
SWELL TESTS
Stagecoach Hills
Town of Westlake, Texas
Project No. 1745
July 21, 2012
Initial Final Dry Overburden
Baring Depth, Moisture Moisture, Wgt, Swell, Pressure:,
No. Ft. , % % pcf % Psf
C-3 3-4 14.4 19.7 107.1 0 375
C-3 4-5 15.7 18.6 111,2 0.9 500
C-8 3-4 12.8 20.5 99.3 0 375
1745 Stagecoach Hills-Sept2012.doc B-2 LAeNDTEC ENGINEERS
GEOTECHRICAL AND CONSTRUCTION MATERIALS ENWHEERING-
7423 Airport Freeway, Fort worth ix 761 is
222 W. Exchange AVVOU0, Uite He, NZ, Fort Worth TX 16106
Tel, (817)-599-9933: (817) 616-0922; fax. W-590-4433
I)FTERMINATION Qf2L
.�NSITY OF COMPACTED WTU�,LUNOUSS
MATERIAL TEX-207-F
PROJECT: Stagecoach Hills PROJECT No- 1745
CLIENT s. 1.andtec REPORT No.;
DATE. 7/1612 TECHNICIAN: T,SMITH
R
SAMPLE I KNESS BULK MAX THO. PER E AI
NUMBER (INCHES) SPECIFIC -SPE.C. GRAV. D F N.?S I'l "VOIDS
GRAVITY
2.20 2.271 2.482
C-7S 1482 ., 97.91
C-9s 2.482 1 93,0
90�i
2.515
C-33 1.72 9.9*
4-
C-711 2.01 2.513 91.1 89
(._(._913 2.30 2.308 1 91.8 f 8.2
_9 2515
r
-------------
SPFQjE1_4;AT1-01 S, 5-9%air voids;91-95 percent densit,y
.LtfKtt,?_ "11-denotes deviation from soecifications
S-denotes surfw�c course,& B-denotes base course
LOCATION.
Resipectfwly Submimd,
Terry
TSIT
7353 Airpoff Freeway, Fort Wotth, Texas 76118
RF,PORTOF CORE COMPRESSIVE STRENGTH
PROJECT NAME: Sta-ccoach Hills REPORT No..
L�
PROJECT NUMBER: 1745 REPORT VATE- 07,116112
CLIENT: Landuc DATE TESTED: X37!11112
CLIENT CON-fACT: TECHNICIAN: 1'. Smith
DATE CORED; 07111:`12
Required Strength: PSI DATE PLACED., Not furnished
MIRII- COR[-'.D CAPPED cm-ft--- UD 11.,A)C RR TOTAL cumpre'sSive
u )ER LENGTH(IN LENGTH(jlfl�N�", IDIAM.(IN) RATIO I FACT. WAD(LBS) Site
n�!
C4 5.58 3.74 1,492 1 0.9588 4000 350
4.60 3.74 1.:30 0.9228 3 321 a 280
'
C9 6.45 3,74 1.725 0.9 776 7300 650
Avcmg,c Sireingth 430 PSI
CORE LOCATION:
3)
Nuiv;Thk mvn i�1'br 11W cxclusivA!ust:at the Clicii I ad&e-ssed.
'I his rclicri wty rjo;hr mproduced except in As calimy,without
the wittm consent ofTSIT, Results appiy only to abowtests.
Afthur Ether',, W 4'1 F
�° - ate• _�:` ,..�r -
�
L
Photograph 3
1745 Stagecoach Hills-Sept2012 Photos.doc G-2 l ANDTEC ENGINEERS
ATTACHMENT
NOTES ARIL CONDMONS
The services described in this report were performed consistent with generally accepted
geotechnical engineering principles and practices. No other warranty, express or
implied, is made. These services were performed consistent with our agreement with our
client. This report is solely for the use and information of our client unless otherwise
noted. Any reliance on this report by a third party is at such party's sole risk.
Opinions and recommendations contained in this report apply to conditions existing
when services were performed and are intended only for the client, purposes, locations,
time frames, and project parameters indicated. We do not warrant the accuracy of
information supplied by others, and the use of segregated portions of this report.
The conclusions and recommendations in this report are invalid if
* The report is used for adjacent or other property or streets
® Traffic type, loading and frequency change from estimated information.
o Grades, shallow subsurface seepage levels, or both, change between the
issuance of this report and construction
Any other change is implemented that materially alters the project from that
proposed when this report was prepared
The pavement and subgrade samples do not provide a warranty of the conditions that
may exist over the entire street. The extent and nature of subsurface soil and
groundwater variations may not become evident until construction begins. Variations in
soil conditions between samples could possibly exist between or beyond the points of
exploration or groundwater elevations may change, both of which may require additional
studies, consultation, and possible design revisions.
Reproduction of this report, or any part thereof, supplied to persons other than the client,
should indicate that these tests and subsequent report of findings and recommendations
are soil type specific only and may not represent other roadway conditions and soil
types.
The scope of our services did not include any environmental assessment or investigation
for the presence or absence of wetlands or hazardous or toxic materials in the soil,
surface water, shallow subsurface water or air, on or below or around this site.
1745 Stagecoach Hilts-Sept2012.doc D-i LAN®TEC ENGINEERS