ST8402-CN 881122(Instructions on reverse side)
CHANGE ORDER
PROJECT: Denton Tap Road Improvements DATE OF ISSUANCE:
from Belt Line Road to Sandy Lake Road
OWNER: City of Coppell
P.O. Box 478
(Name.
Address) Coppell, Texas 75019
CONTRACTOR:
CONTRACT FOR:
L.H. Lacy Co. OWNER's Project No.
P.O. Box 541297
Dallas, Texas 75354 ENGINEER: Ginn, Inc.
17103 Preston Rd., Suite
, Denton Tap Road Improvements L.B. 118
from Belt Line Rd. to Sandy Lake Rd. Dallas, Texas, 75248 J-378
ENGINEER's Project No.
You are directed to make the following changes in the Contract Documents.
Description: Substitute Portland Cement at $50.00/TON for Lime Slurry, Ty. A, 5%, 22.5#/SY
at $61.00/TON (Pay Item 264); and Cement Treatment, mat. in place, 'for L/me Treatment,
mat. in place at the same unit prices (Pay Item 260).
Purpose of Change Order: To achieve an estimated reduction in Estimated Contract Amount of
$7,624.10, while providing a constructed project which will be equal to that which was
originally specified.
Attachments: (List documents supporting change) 1. L.H. Lacy Co. letter of October 8, 1988 to Ginn, Inc.
2. ~lohn H. Hames ,5 Associates, Inc. October 17 1988
· etter to Ginn, Inc. '
CHANGE IN CONTRACT PRICE:
Original Contract Price
$. 3,362,580.00
Previous Change Orders No. N/A to No.
$. N/A
Contract Price prior to this Change Order
3,362,580.00
$
Net Increase (decrease) of this Change Order
$ approx. ($7,624.10)
Contract Price with all approved Change Orders
3,354,955.90
$.
CHANGE IN CONTRACT TIME:
days or dale
Original Contract Time
365
Net change from previous Change Orders
0
days
Contract Time Prior to this Change Order
365
days or date
Net Increase (decrease) of this Change Order
0
Contract Time with all approved Change Orders
days or date
RECOMMENDED:
EJCDC No. 1910-8-B (1983 Edition)
APPROVED:
by
Owner
APPROVED:
Prepared by thc Engineers' Joint Contract Documents Committee and endorsed by Thc Associated General Contraclors of America.
' , CHANGE ORDER
(Instructions on reverse side)
No.
PROJECT:
OWNER:
(Name,
Address)
Denton Tap Road Improvements DATE OF ISSUANCE:
from Sandy Lake Road to Denton Creek
City of Coppell
P.O. Box 478
Coppell, TX 75019
CONTRACTOR: L.H. Lacy Co. OWNER's Project No.
10888 Shady Trail
Dallas, TX 75354-1297 ENGINEER: Ginn, Inc.
17103 Preston Road, Suite 100
CONTRACT FOR: 'Denton Tap Road Improvements Dallas j TX 75248
from Sandy Lake Road to Denton Creek
ENGINEER's Project No. J379
You are directed to make the following changes in the Contract Documents.
Description: Substitute Portland Cement at $50.00/TON for Lime Slurry, Ty A, 5%, 22.5 #/SY
at $67.00/TON and Lime Slurry TY A, 5%, 34 #/SY (9" thick) at $63.00/TON (Pay Items 264
and 264.1); and Cement Treatment, mat. in place for Lime Treatment, mat. in place at the
Purpose of Change Order: sRme unit prices, (Pay Item 260)
To achieve a reduction in estimated Contract Amount of approximately $6,808.00 while
providing a constructed project which will be equal to that which was originally specified.
Attachments: (List documents supporting change) 1. L.H. Lacy Co. letter of October 8, 1988 to Ginn, Inc.
2. John H. Haynes & Assoc,, Inc. 'letter of Oct. 17, 1988
CHANGE IN CONTRACT PRICE:
Original Contract Price
$ 1. 789.363.03
Previous Change Orders No. N/A
$
to No.
Contract Price prior to this Change Order
$ 1,789~363.03
Net Increase (decrease) of this Change Order
$ approx. ($6,808.00)
Contract Price with all approved Change Orders
$ 1~782~555.03
N/A
CHANGE IN CONTRACT TIME:
d~.ys or date
Original Contract Time
365
Net change from previous Change Orders
0
Contract Time Prior to this Change Order
365
days or date
Net Increase (decrease) of this Change Order
0
Contract Time with all approved Change Orders
365
days or date
RECOMMENDED:
/ Enginrer
EJCDC No. 1910-8-B (1983 Edition)
APPROVED:
by
APPROVED:
by
Prepared by the Engineers' Joint Contract Documents Commiltee and endorsed by The Associated General Contractors of America.
GINN, INC.
November 22, 1988
Mr. Russell R. Doyle, P.E.
City Engineer
City of Coppell
P.O. Box 478
Coppell, Texas 75019
CONS INEERS
Re:
Denton Tap Road Improvements from Belt Line Road to Sandy
Lake Road; and from Sandy Lake Road to Denton Creek.
Dear Mr. Doyle:
This letter is a follow-up to my November 16, 1988 letter and
your November 18, 1988 response concerning the proposed Change
Order No. 1 to both projects for the replacement of Lime with
Cement for subgrade stabilization. I am enclosing a copy of John
H. Haynes and Associates, Inc. Laboratory Report No. 18, dated
November 4, 1988, which states the conditions under which the
Cement Stabilization will be acceptable on this project. In our
discussions with the Contractor, L. H. Lacy Co., they have agreed
to abide by the John H. Haynes and Associates Inc.
recommendations and to apply the additional cement required near
Station 91+00 to reduce the Plasticity Index to 12 or less, at
no additional cost to that proposed for 5% treatment.
Since this item has been reviewed and approved by our
Geotechnical Engineer, and we have previously informed you of the
potential cost savings of approximately $ 14,072.10 associated
therewith, we feel that it is in the best interest of the City of
Coppell to approve the proposed Change Orders and allow the
Contractor to proceed at once with his subgrade preparation.
Please call me if you have any questions.
Sincerely,
John C. Karlsruher, P.E.
Project Engineer
enclosures
cc:
Alan D. Ratliff, City Manager
Frank Trando, Deputy city Manager
H. Wayne Ginn, P.E.
David M. Snyder, P.E., L. H. Lacy Co.
Randy Fleming
J378/379
17103 Preston Road ® Suite 100 · LB 118 · Dallas, Texas 75248 · Phone 214/248-4900
GINN, INC.
CONSULTING ENGINEERS
November 16, 1988
Mr. Russell R. Doyle, P.E.
City Engineer
City of Coppell
P.O. Box 478
Coppell, Texas 75019
Re:
Denton Tap Road Improvements from Belt Line Road to Sandy
Lake Road; and from Sandy Lake Road to Denton Creek.
Dear Mr. Doyle:
I am transmitting one copy each of Change Order No. 1 for each
project for approval by the City Manager. These Change Orders
cover the use of Cement for subgrade stabilization in lieu of the
Lime which was originally specified. The end result of approval
of these Change Orders will be that a net savings of
approximately $14,072.10 will be realized by the City on the two
projects, while achieving a finished product which is equal to
that originally specified. The Change Orders have been executed
by both Ginn, Inc. and L. H. Lacy Co., and may be executed by the
City Manager without Council action since each is a reduction in
Estimated Contract Amount, and neither exceeds a change of more
than $ 10,000.00.
For your review we have attached supporting documentation upon
which our recommendation for approval of the Change Orders is
based. Time is of the essence, since the Contractor intends to
begin stabilization within the next couple of weeks and must have
a definite decision within the next few days in order to avoid
delays in completion of this project. I apologize for the short
notice, but we have been holding this item pending the
Contractor's receipt of test reports from his laboratory
confirming their verbal affirmation that the proposed subgrade
treatment will be acceptable. The report has just been received,
and the Contractor has asked us to proceed with processing the
Change Orders. As we had verbally been assured, the proposed
Cement Stabilization is acceptable, and therefore we recommend
proceeding with approval of Change Order No. 1 for each project
at this time.
Page 1 of 2
17103PrestonRoad · Suitel~ · LBll8 · Dall~,Tex~75248 · Phone214/248-49~
If acceptable to the City Manager, please have him execute the
original Change Orders and return two copies: one for issuance
to the Contractor; the other for our files. You should file the
Original Change Orders with your Original Contract Documents.
Please call me if you have any questions.
Sincerely,
~ohn C. Karlsruher, P.E.
Project Engineer
enclosures
cc-
Alan D. Ratliff, City Manager
Frank Trando, Deputy City Manager
H. Wayne Ginn, P.E.
David M. Snyder, P.E., L. H. Lacy Co.
Randy Fleming
J378/379 (a:dtcemco.)
Page 2 of 2
JOHN H. HAYNES ~, ASSOCIATES, INCOFIPOFIATE~O
Geoteohnical Engineers
November 4, 1988
L. !!. Lacy Company
10888 Shady Trail
P. O. Box 541297
Dallas, Texas 75354-1297
Attention: Mr. David M. Snyder, P.E.
Re: Cement Stabilization Tests
Denton Tap Road Improvements
Coppell, Texas
Job No. 3198(b)
Report No. 18
Gentlemen:
As requested, we have checked the roadway subgrade along the referenced
alignment to locate representative clay samples with high Liquid Limits in lhe
range of about 48 to 56. Two samples were obtained and tested to evaluate their PI
reduction with the use of cement. The results of these studies are shown on Plate
No. 1. It was found that the dark gray clay sample having an LL of 47.5 was
effectively stabilized with 5% cement addition having a reduction in PI to 10.9.
ltowever, in the case of lhe sample with an LL of 55.8, 5% cement only reduced the
PI to 13.3 whereas 7% cement reduced the PI to 10.7. With the exception of this
lalter sample obtained at Station 91+00, all other areas of subgrade checked
appeared to have lower plasticity than the other sample tested.
Therefore, it is our opinion that 5% cement can be substituted for 5% lime as
requested by the contractor in all areas with equal reduction in PI to below 12 wilh
the exception 'of lhe area around Station 91+00. In this area (and probably up and
down station maybe 100'), it is recommended that the cement factor be raised to 7%
for adequate PI reduction. The actual extent of the area underlain by the higher
plaslic clay (identified as light gray, dark gray and tan CH clay) should be
identified on the ground by our engineering lechnician and marked for the
higher concentration if cement is substituted for the specified lime material.
The compaction specification that L. H. Lacy suggested to use for lhe cement
stabilization work (COG Spec Item 4.9) indicates Ihe use of the THD lI3-E method. In
order to reduce costs, it is our opinion that a substitution could be made whereby
the Modified Proctor Method (ASTM D-1557) could be used and a minimum
reqnirement of 95% Modified compaction is required. It is believed that very little
difference in density will occur if this substitution is made and 95% compaction is
still required.
2424 Stutz Drive · I~.0. Box 35481 · [3alias, Texas 75235 · (214) 350-5600
JOHN H. HAYNES & ASSOCIATES, INC.
Geotechnical Engineers
Oinn, Inc. - 2 -
November 4, 1985
If we can be of furlher help, please let us know.
Jlttl/jeh
(2 copies submitted)
cc: Mr. Randy Fleming (1 copy)
Ginn, Inc.
Yours very truly,
JOHN H. HAYNES & ASSOCIATES, INC.
- II]$ Illl I I[~ - 11111 Il [Il [
-- JOHN H. HAYNES & ASSOCIATES, ,NC.
--I
~. n3
0 ~-"'
Geotechnic81 Engineers
JOHN H. HAYNES ~, ASSOC:IATES, INCOFIPOFIA~
GeoCeohnioal Engineers
October 17, 1988
Ginn, Inc.
17103 Preston Road, Suite 100, LB 118
Dallas, Texas 75248
Attention: Mr. John Karlsruher, P.E.
Re: Cement Stabilization Substitution
Denton Tap Road Improvements
Coppeil, Texas
Job No. 3198(b)
Gentlemen:
In accordance with your letter request of October 12, 1988, we have reviewed L.
H. Lacy's request for a substitution of 5% cement for the specified 5% lime for
subgrade stabilization on this project with the change in procedural specifications to
the North Central Council of Government Standard Specification Item 4.9.
We believe this substitution would be acceptable provided that it is
demonstrated that 5% cement will reduce the PI of all the subgrade soils along the
project to not greater than 12. In our original geotechnical reports, we identified
some number of plastic clays along the alignment which had Liquid Limits of 50 to 58
and PI's of 27 to 34. In order to prove lhat 5% cement is adequate, we suggest that the
subgrade be checked and at least two samples of untreated clay be obtained for
laboratory tests that have a Liquid Limit greater than 50. The untreated PI of these
clays should be on the order of 30 to 35 and this should be proved by laboratory test.
These plastic clay samples should then be treated with 5% cement and it should be
demonstrated that this is sufficient to reduce the PI to not more than 12. If this is not
possible, additional cement should be added until this PI reduction is achieved. All
areas should then be uniformly treated with at least 5% cement or more if it is found
that a greater cement factor is required to stabilize these plastic clay soils.
It should be pointed out that COG Spec. Item 4.9 requires compaction to be
controlled by Test Method THD l13-E. The cost of this 24 hour M6dified Proctor test is
2424 Stutz I-)rive · 1~.O. I--lox ~154EI1 · Dallas. Texas 75235 ·
JOHN H. HAYNES & ~/~'~SOCIATES, INC.
Geotechnical Engineers
Oinn, lnc. 2-
August 23, 1988
higher than the 24 hour Standard Proctor test ($200 vs. $140) so a slight difference in
cost will be incurred.
If you have any questions concerning this report, please let us know.
Yours very truly,
JHll/jeh
JOHN H. llAYNES & ASSOCIATES, INC.
GINN, INC.
October 12, 1988
CONSULTING ENGINEERS
Mr. John H. Haynes, P.E.
John H. Haynes & Associates, Inc.
2424 Stutz Drive
P.O. Box 35481
Dallas, Texas 75235
Re: Denton Tap Road Improvements, Coppell, Tx.
Dear Mr. Haynes:
I am enclosing a copy of a letter from L. H. Lacy Company which
is requesting that Cement Stabilization be used for subgrade
treatment in lieu of Lime Stabilization as specified in your
geotechnical investigations and our design for the projects. If
Cement Stabilization can be used on this project, there may be a
considerable savings in both construction time and cost to the
City of Coppell. I would like for you to review and evaluate L.
H. Lacy Company's request. In our previous conversations
regarding this subject you mentioned that in order to evaluate a
request such as this, some information indicating the rates of
application, thickness, and acceptance criteria should be
included. In reading the attached letter it is not apparent what
the acceptance criteria should be, but the rates of application
and thickness proposed appear to be the same as that proposed for
the Lime Stabilization. If you need the results of tests, such
as Ph/PI, Proctors and etc. to evaluate this request, please
respond accordingly.
In order to justify his request the Contractor must pay for and
provide us with any test data or design data which will
adequately convince you that what they are proposing will result
in a finished product equal to or better than that originally
specified. Please call me if you have any questions.
Sincerely, ·
--?1 ~-~ j'. ×,' /'
/" .; I /t /~_. ~.~..,.
pr¢~ ect Enqineer
JCK/j k
enclosures
cc: H. Wayne Ginn, P.E.
David M. Snyder, P.E. - L. H. Lacy Co.
Randy Fleming
17103 Ih'cston Road ·Suitc 100 $ IBII8 · I')allas. Tcxas 75248 · Phone 214/248-4900
GINN, INC.
October 13, 1988
CONSULTING ENGINEERS
Mr. David M. Snyder, P.E.
L.H. Lacy Company
10888 Shady Trail
P.O. Box 541297
Dallas, Texas 75354-1297
Re: Denton Tap Road Improvements from Belt Line Road to Sandy
Lake Road and from Sandy Lake Road to Denton Creek, ~oppell,
Texas.
Dear Mr. Snyder:
In response to your letter of October 8, 1988, concerning the use
of Cement Stabilization in lieu of Lime Stabilization for
subgrade treatment for the above mentioned projects, we have
submitted the information you furnished us to John H. Haynes and
Associates, Inc. for their review and comment. A copy of the
letter we sent to John H. Haynes is enclosed for your use.
We will await the comments from John H. Haynes and Associates,
Inc. before giving further consideration to your proposal. In
the meantime if more information supporting your request
develops, please feel free to forward it to us. Please call me
if you have any questions.
Sincerely,
Pro] ect ~:ng~neer
JCK/jk
cc: H. Wayne Ginn, P.E.
Randy Fleming
17103 Prcston Road ·Suitc 100 · I.,1{ IIg · l)alla.s, Texas 75248 · Pho,c 2141248-4900
I:J 1NN.~ ].NU.
1 / 1 il).:!. F>RES i LiN RURD
L)RLL. R~, I X 7~=.'48
I)ENIUN 1~4P Rt]~.~l.) IMPRLJVEMEN'f F'ROJE[:T'S FI-(DM I:tEL'i LiNE '1'0 I)EN'ION CREEl,::
I:-'fd]Jl=.[;'l b (:~.F~::I ,~,: .'";/'::~
.ql"TN: JOHN C. KARLSRUHFR, P·E.
JOHN.,
THE L. H. LACY CO. WOULD LIKE TO FORMALIZE IT'S REQUEST FOR THE FOLLOWING
ALI'ERNAI"IVE MEI'HOD OF SUBGRADE SI'ABILIZA]'ION ON BOTH OF THE ABOVE RFFERRENCED
PRO,] EC l'S:
SANDY LAKE 'TO DENTON CREEK
PRO,] ECT (.379)
i) ll'EM 264 - LIME~ 1~8 TON TO
lA) I'T'EM 2~4. 1 -- LIME (9")., 504 1'ON TO
ITEM 2&4 - CEMENT, 1&8 'r'ON
ITEM 2&4. 1 - CEMEN'I', :~0~ ]'ON
BELT LINE TO SANDY LAKE
PROJECT '(578)
i) ll'EM 2~4 -- LIME.', 69.3. 1 TON
"FO ITEM 2~4 - CEMENT~ 695. 1 I'ON
I'HE RL"fERNA1E METHOD AND SUBSEQUENT PRICE REDUCTION ARE PREDICATED ON
F'OL.L~OW I NG:
1) AL.L WORK TO BE DJ]NE IN ACCORDANCE WITH THE ATTACHED NORTH TEXAS COUNCIL
OF GOVERNMENT SI"ANDARD SPECIFICATIONS FOR F'UBLIC WORKS CONSI'RUCI"iI3N.
(ITEM 4.9)
2> A ONE' -FO ONE (1 'TO 1) SUBSTITUTION OF CEMENT FOR LIME (AS REFLECTED
ABOVE ) .
I'HE L. H. LACY COMPANY PROPOSES THE FOLLOWING PRICE REDUCTIONS IN CONSID-
ERAI'ION I]F' THE PROPOSAL. AS IT IS S'I'A'I'ED iN 1HIS LETTER, ANY CHANGE IN MEI'HOD
OR QUAN'I'ITIES FROM "FHOSE F'ROF'OSED WILL REQUIRE A RESPONSE FROM L. H. LACY CO.
L H, Lacy Company
General Contractors
214/357-0146
"Quality Construction for over 65 Years"
10888 Shady Trail
P.O. Box 541297
Dallas, Texas 75354-1297
SI~NDY LAKE fO [,~EN'T'[IN CREEK
I='F(O,] E(:T (:~.79)
1) I'"I"EI'I ?,':/I - £:Ei]'Ii~:N'I'.~ lg:,[:] "I"ON ,~ $SC).I'~-)/"I"ON (FIF"I'Y DOL. LARS i::'L=.R "I"L3N)
l~'a) ~"I"EI'I 2~/I-. ]. - CEl"lli:..l'~'f' (9"): ?',0,1 "I'ON ;~) '~SC).O0/"['ON (I:'~FTY DOL. LI.~f(S F'EF(]"ON)
1:-'1:'¢03 EC'I' ( :378
:~ ~t~50.OL)/'¥ON (FIF'"I'Y DOL_L~'-~F¢S [:'ER TON)
IN ADDITiI]N 'l"O THE CC)~;'f' S~'~VINGS F:OIR THE CITY OF COPPELI. IN SUPPL. Y INL~
EQUAL [')1~ J~:~ET'I'ER F'F((:)[)UCT.~ THE L. H. L.~CY COHI:'t.~NY LdOLJLI) LIKE Gi'NN.,
I'.:ONSI£)I?.'R ]'HP' '/IHI":]..Y Nt.~TU['~I~ 01:: THt'::SI~.: PI:~O,]E£:'I'S., THE I~t. IVI3R/.~£~LI:: TYPES OF THE
V~-~RIE)L.J'3 SU~3(']R~:~DE Ht-~'I'E~:~P..,L.S PRESE'NT ON THE ,]OL~S TO }liE ST~B[L/ZED.,
L. H. L~CY;'S PREV):E)US SUCCE:SSES WI'I'H S[Mli_~R (:EHENT-TREA"T'ED StJB6R(-~DE AI_T-
I'~ATES F./ND THE INHER~EN'I I"I'HE-'3~.'~VINI3S £]U;-~LI'¥IE..S OF THIS METHOD OF
L I ZA'T l EJN.
Af5 ~ REHJNDER TH]'S I,,JL:)RI.::. IS SCHEDULED FOR 'THE NE/AR FUTURE~ NE~ REf2LJE'ST THE
F:/~M(:JF:~ 01=' Y[:JUI:~ F~Ef:'I_Y SI} NE CI-'~N I~:ZXECU'I'E I='UF~(:Hf.~,SE OR])I':F(S F'OF( 'I"HI::' I~1(A'1'1~:1:¢~tl_~ [""T(:.
'I'H¢-~NI::.-.-YOLJ ~:'12)[{ YL]LJ[{ COl,l':;J DER/-'~T iON 1N TH!S ~L..'I'ERNATE IqE'I'HOD OF'" 'CDNs'rRUCT ZON.
I:)~4VID Pl. SNYL)ER: F".E.
EI',IC: liNE (1) (::OF'Y [')F Nt:)[~'l'l-t -I'EX~-tS CoIJr,ICIL OF GOVEF~r,II'IE-.'NT
Sl::'[{C 1 F' 1 I".'(-YI' ]: [INS F'CJF( f:'tJ£q_ 1 C I,,JOl:~K.c:'i I:(::ll~lEi'l"l:~tJl:'l 1 ON., ~ I 'l"Erq '~t. ~1 ) .
CC:
I-:~ []lXl Hc/-~VO Y
[:' 1 Lli: :1 10 CO[~I:'qi:.'SI::'OI',IDENC[ii.
tance by the OWSER. Repairs are to be made in a manner which shall
insure restoration of a uniform surface. Durability of the part required
shall be measured in its final position and the volume computed in cubic
yards (Ms) by the method of average end area.
Soil-asphalt course shall be measured by the square yard (M~) of sur-
face area of completed and accepted work based on the width of the
soil-asphalt course as shown on the plans, or as established by the
owsER. Asphaltic material of the type and grade shown on the plans
shall be measured In gallons (liters) at the applied temperature at the
point of application on the road.
Work performed and materials furnished as prescribed and measured
by this item shall be paid for at the unit prices bid for soil-asphalt
course and additional soil, which priees shall be full compensation for
cleaning the roadbed or the surface of the previously completed base
course; for furnishing all materials; for loosening excavating, loading,
hauling and delivering additional soil on the road; for loosening, mixing
and pulverizing of the soil; for shaping, sprinkling and compacting the
subgrade; for all processing, mixing, drying, incorporation of asphaltic
material, aerating and drying, spreading, sprinkling, shaping, compact-
lng, and finishing; for maintaining under traffic; and for all manipula-
tions, labor, equipment, fuels, tools and incidentals necessary to com-
plete the work except as hereinafter provided.
Asphaltic material measured as provided in this item shall be paid for
at the unit price bid for asphaltic material, which price shall be full
compensation for furnishing the material; for all freight involved; for all
unloading, storing, heating, hauling and applying on the read; and for
all labor, equipment, fuels, .tools and incidentals necessary to complete
work.
ITEM 4.9.PORTLAND CEMENT MODIFICATION OF
SUBGRADE SOILS
4.9.1. DE~RIPYION: This item shall consist of the treating the sub-
grade soils by pulverizing, addition of portland cement and water,
mixing and compacting the mixture to the required' d~nsity. This item
applies to natural ground or embankment encountered in the con-
struction. The cement-modified soil layer shall be constructed as
specified herein and in conformity with the typical sections, lines and
grades as shown on the plans or as established by the
4.9.2. MATERIALS:
(a) Portland Cement. Cement shall conform to the requirements of
Item 2.2. L, "Cement."
(b) Water. Water shall conform to the requirements of Item 2.2.4.,
'%Vater."
(c) Soil. The soil shall consist of approved soil, free from vegetation
or other.objectionable matter. It may be either the material encountered
in the existing section, material secured from approved sources shown
AUGUST 1M7
on the plans or as designated by the ow~-a, or a combination of existing
and additional soil from approved sources, as shown on the plans, or az
directed by the ovm~a.
4.9.3. EOUIPM£NY: All equipment necessary to properly prosecute,
perform and complete the work within the contract time, shall be on the
project and shall be approved by the owsza as to type and condition be-
fore the cosr~Acrog shall be permitted to begin construction operations
on which the equipment is to be used.
The cement-modified soil layer may be constructed with any machine
or combination of machines and auxiliary equipment that shall produce
the results meeting the requirements for soil pulverization, cement ap-
plication, water application, mixing, incorporation of materials, compac-
tion, and finishing as specified herein. The CONTR~tCTOR shall at all times
provide sufficient equipment to enable continuous performance of the
work and its completion in the required number of working days.
4.9.4. CON$?IqUCTION Mh-I'HOD$:
(a) C_,eneral. The primary requirement of this specification is to
secure a complete course of treated subgrade material containing a
uniform portland cement mixture, free from loose or segregated areas,
of uniform density and moisture content, well bound and compacted for
its full depth with a smooth surface suitable for placing additional sub-
base, base or surface courses. It shall be the responsibility of the
¢os~'aAcvoa to regulate the sequence of his work to process a sufficient
quantity of material so as to provide full depth as shown on plans, to use
the proper amount of portland cement, maintain the work and to rework
the courses as necessary to meet the foregoing requirements.
Before other construction operations are begun, the roadbed shall
be graded and shaped as required to construct the portland cement
modified subgrade layer in conformance with the lines, grades, thickness
and typical cross sections shown on the plans. Unsuitable soil or material
shall be removed and replaced with acceptable soil. The subgrade shall
be firm and able to support without displacement the construction equip-
ment and the compaction hereinafter specified. Soft or yielding subgrade
shall be corrected and made stable before construction proceeds.
(b) Application of Cement. Portland cement shall be spread uni-
formly by an approved dry or slurry method on the soil at the rate
specified on the plans or as determined by preliminary laboratory tests.
If a bulk cement spreader is used, it shall be positioned by string lines or
other approved method during spreading to insure a uniform distribu-
tion of cement. Cement shall be applied only to such an area that all the
operations can be continuous and completed in one operation.
The percentage of moisture in the subgrade soil at the time of
cement application shall not exceed the qmmtity .that shall ~permit
uniform and intimate mixture of soil and cement during dry-mixing oper-
ations; and it shall not exceed the specified optimum moisture content
for the soil and cement mixture.
No equipment, except that used in the spreading and mixing, shall
be allowed to pass over the freshly spread cement until it is mixed with
the soil.
AUGUST lg87
' J 4.e.4 2e3b
(c) Mixing and Processing. The mixing procedure shall be the same
for "Dry Placing" or "Slurry Placing" as described herein. The material
and cement shall be thoroughly mixed by approved road mixers or other
approved equipment and the mixing shall continue until, in the opinion of
the Engineer, a homogeneous, friable mixture of material and cement is
obtained, free from all clods or lumps. Materials containing plastic clays
or other material which will not readily mix with cement shall be mixed
as thoroughly as possible at the time of the cement application and
brought to the proper moisture content. The material shall be kept moist
as directed by the Engineer.
The cement-soil mixture shall meet the following gradation require-
ments when tested dry by laboratory sieves:
Minimum Passing 1" Sieve ........................... 100%
Minimum Passing l/z~ Sieve .......................... 70%
Minimum Passing No. 4 Sieve ............. ~; ....... 45%
(d) Compaction. Compaction shall begin immediately after final mix-
ing. The material shall be compacted to 95% of the maximum density, as
established, and in accordance with Test Method Tex I13-E. It shall be
aerated or wetted as necessary to provide optimum moisture. Moisture
tolerances shall be as described below.
Prior to the beginning of compaction, the mixture shall be in a loose
condition for its full depth. Compaction shall begin at the bottom
and shall continue until the entire depth of the mixture is uniformly
compacted.
Description Density, Percent Moisture, Percent
For cement treated Not less than 95, Within 2.5 of
subgrade that will except when shown optimum unless
receive subsequent otherwise on the otherwise shown
courses, plans, on the plans.
In-Place Density tests shall be as outlined in Test Method Tex l14-E
or Test Method Tex llS-E. In-Place Density tests shall be performed at
the rate of one per 300 linear feet of paving for two (2) lanes. The suita-
bility of the stabilization shall be confirmed by Atterberg Limit testing
at the rate of one test per 2,500 cubic yards of processed material.
In addition to the requirements specified for density, the full depth
of the material shown on the plans shall be compacted to the extent
necessary to remain firm and stable under construction equipment.
After each section is completed, tests as necessary will be made by the
Engineer. If the material fails to meet the density requirements, it shall
be reworked as necessary to meet these requirements. Throughout this
entire operation the shape of the course shall be maintained by blading,
and the surface upon completion shall be smooth and in conformity with
the typical section shown on the plans and to the established lines and
grades. Should the material due to any reason or cause, lose the stabll-
ity, density and finish before the next course is placed or the work is
accepted, it shall be recompacted and refinished at the sole expense of
the CONTRACTOR.
(e) Finishing and Preparation for Surfacing. After the final layer or
course of the cement-modified subgrade has been compacted, it shall be
brought to the required lines and grades in accordance with the typical
sections. The completed section shall then be finished by rolling as di-
rected with a pneumatic tire or other suitable roller sufficiently light to
prevent hair cracking. Preparation for final surfacing may begin ira-
mediately.
4.9.5. MAINTENANCE: The COSrP.~CrOR shall be required, within the
limits of his contract, to maintain the cement-modified soil in good cendi-
tion from the time he first starts work until all work shall have been
completed. Maintenance shall include immediate repairs of any defect
that may occur after the cement is applied. Such maintenance work shall
be done by the CO~?RACrOa at his own expense and repeated az often as
necessary to keep the area continuously intact. Repairs are to be made
in such a manner as to insure restoration of a uniform surface for the full
depth of treatment. Any low area shall be remedied by replacing the
material for the full depth of treatment rather than adding a thin layer of
stabilized material to the completed work.
4.9.6. MEASUREMENT AND PAYMENT: This work shall be measured
by the square yard (M") of completed and accepted cement-modified
soil. Measurement for cement shall be by the ton, 2,000 pounds (900 kg)
of dry weight, as determined by certified weight tickets. No allowance
shall be made for any materials used or work done outside the Limits as
established by the ow~.a. The work performed and material furnished
as prescribed by this item and measured as provided in this item shall be
paid for at the unit price bid for cement-modified soil, which price shall
be full compensation for pulverizing the soil material; for handling; haul-
ing and spreading the dry or slurry cement mixture; for mixing the
cement with the pulverized soil; furnishing, hauling and mixing water
with the cement-soil mixture; spreading and shaping the mixture; com-
pacting the mixture, including all relling required for this compaction;
surface finishing;, and for all manipulation, labor, equipment, appliances,
tools and incidentals necessary to complete the work and carry out the
maintenance provisions in this specification. Cement material measured
az provided in this item shall be paid for at the unit price bid for cement
material, which price shall be compensation for furnishing the material;
for all freight involved, for all unloading and storing; and for all labor,
equipment, fuels, tools and incidentals necessary to complete the work,
all in accordance with the plans and these specifications.
AUGUST
d
~ F~o?, pv,~4'?.
5F_~-I-I OIN ~ b---FA. 191 +~0
BIT "B"
¢-rZd 14. ~ It':~' V. /
/1
/
NOTE: STUBOUT -3a IS
USE 8~ WILL D FOR FUTUR~
SERVICE PORTIONS OFI
AREAS I0 AND II.
CAUTION l!
EXIST. GTE DUCT
AREA. TO BE EEl
BY OTHERS.
THIS
ii= 456.97
PAY ITEM 475.21
OTE= EXTRA DEP~
7'-
x RCBC
II
LAT.
24"R(
2- 8' x4' RcBc
147 LF ea.
R.O.~. L/ne
· fer E'sm'!
I
AD'JUS-T F.H..-;'.q'?! 1
.?_L.,'r E.. 5s&sj:,,.:'
F~'DJUST
[PAY ITEM'
ADJUST W.
PAY ITEM
2-2" PVC 221 L
STA. 191 +94.64
2-10' REC'D. INLETSJ
T.C 52.89
w
CI-IA~E 0EPt~-~, I'
Ii
¢
Z
~_.CT~O NI e.
5T4. 1~5+ O0
I STA. 194+50
I1-10' REC'D. INLET {,MOD]
I i~C. = 4 64.46
= 456.96
IPAY ITEM 475.21
L~TE: EXTRA DEPTH INLET
r
EXIST. G.T.E.M.H. TO BE I
ADJUSTED BY OTHERS i
I
b = 2° 30' 00" LT.__ --.--J
I STA. 196+ 80 P.I.- 38.5' LT. I
I A = 2° 30' 00" RT.
Wa/er Esm '!
F..~ &" ?~c -.,
IADJUST F H.~ ~.V.-]
[PAY ITEM 582_.3
?-~L~: I"= ~0~