ORDER NO. 17150
CITY OF KERRVILLE AUTHORIZED TO ADVERTISE AND ACCEPT BIDS
FOR PHASE II SANITARY LANDFILL CLOSURE
On this the 9th day of March 1987, upon motion made by
Commissioner Ray seconded by Commissioner Baldwin ,
the Court unanimously approved that the City of Kerrville
be authorized to advertise and accept bids for PHASE II
SANITARY LANDFILL CLOSURE.

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BUSINESS OF THE CITY COUNCIL
CITY OF KERRVILLE, TEXAS
SUBJECT:
Authorization of Bids for Phase II
Sanitary Landfill Closure
PROCEEDINGS:
Authorization to request bids
AGENDA MAILED'TO:

FOR AGENDA OF: 3/10/87
SUBMITTED BY: J. Menn a
DATE SUBMITTED: 3/5/87
CLEARANCE,S~1 ~
R. Conne Terrell, ~~,
R. Thoma
EXHIBITS:
Landfill Closure Plan Map
(Landfill Closure Plan'on file
in Public Works office) dlh
APPROVED FOR SUBMITTAL: ,~!/1~
~:xpenaicure current tsalance wmount /wccount
Regd: _____ _-in Acct: $51_,000 ( Bdgted: $51,OOO~~No.: 01-35-8501
SUMMARY
This is a budgeted expenditure #01-34-9501.
Estimated expenditure amount for equipment and labor necessary to close
out areas B, C, and D on the attached Landfill Closure Plan map is
$51,000. Areas B, C, and D comprise approximately 55$ of Permit 510 that
contains solid waste. ~-
RECOMMENDED ACTION
Authorize staff to accept bids. (County concurrence required.)
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CONTRACT
CITY OF KERRVILLE
This agreement made this day by and between the City of
Kerrville, sometimes called "City," and
named "Contractor", as follows:
1. TAE WORK
The work to be done under this contract includes the
furnishing of all superintendence, labor, material,
transportation, tools, supplies, plaht equipment, and
appurtenances necessary .for placing earth cover as herein
specified~bn the area designated as Phase II.
The following are incorporated herein by reference:
a. Invitation to Bid
b. instructions to Bidders
c. Proposal
d. General Conditions
e. Special Conditions
f. Plat of Areas
g. Written addenda may be issued before bids are due;
if so, they become part of this contract.
2. CONTRACT SUM
The City shall pay the Contractor the Contract Lump Sum of
The amounts actually accomplished shall not affect the amount
due the Contractor. The Contractor's bid form is
incorporated herein by reference.
3. TIME
The work to be performed hereunder shall commence on date
Notice to Proceed has been given by City. Thereafter,
substantial completion shall be achieved in no more than
calendar days.
4. LIQUIDATED DAMAGES
Liquidated damages are hereby established in the amount of
twenty-five dollars ($25.00) per calendar day for each
calendar day after the above-stated date that the work is not
substantially complete. City may offset any such liquidated
damages against any sums from time to time due by City to
Contractor. ~.
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The completion time assumes that fifteen percent (15~) of the
calendar days are "bad weather days," days on which the work
cannot proceed; therefore, the time for completion shall not
be extended on account of bad weather until the said number
of assumed "bad weather days" has been exceeded. Any
additional days that work cannot be performed because of bad
weather shall cause an extension in the contract .for the same
number of days.
The time for completion shall not be extended except by
written memorandum executed by the Contractor and the City
Manager,,, except as allowed above. The Contractor shall make
written application to the City within ten days of the day,
event, or cause claimed by the Contractor to be a delay.
Failure to make such written claim within such time shall
result in a waiver by the Contractor of an extension for
those particular days, events, or causes. If, for example, _
this Contract assumes twenty bad weather days and Contractor
desires a one-day extension for the twenty-first day of rain, _
the Contractor shall make a written claim within ten days of
such twenty-first day.
The said amount per day is not a penalty but an agreed amount
of actual damages, which is difficult to calculate. Such
damages include loss of staff time, answering complaints
by citizens who have been inconvenienced by the work, City
Council time, and other damages difficult to anticipate.
5. PROGRESS PAYMENTS
The City shall pay the Contractor ninety percent (90$) of
that portion of the Contract Lump Sum properly allocable to
labor, materials, and equipment incorporated in the Work and
ninety percent (90$) of that portion of the Contract Lump Sum
properly allocable to materials and equipment suitably stored
at the site or at some other location agreed upon in writing
_ ~ by the City Engineer, less the aggregate of previous payments
made by the City and, upon Substantial Completion of the
entire work, a sum sufficient to increase the total payments
to ninety percent (90~) of the Contract Lump Sum. All
' retainages from progress payments shall be withheld without
liability for interest.
6. LIABILITY
The Contractor shall indemnify and save harmless the City and
its employees from any and all liabilities arising out of the
work, even though it be alleged or proved that the City's
negligence caused, solely or in part, such liability.
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Page 3
7. CASUALTY INSURANCE
In the event the work includes structures or buildings
susceptible to fire damage, windstorm, or other casualty,
then the Contractor, before being authorized to begin work,
shall furnish the City a duplicate original of an insurance
policy, naming the City as an additional insured. Such
insurance shall insure both the City and the Contractor
during the term of the work against loss by fire, windstorm,
vandalism, theft, or other casualty. Such policy shall be in
the total amount of this Contract.
8. UAQ LITY OF WORK
All work shall be of good workmanship. The Contractor shall
comply with the City Building Code and all applicable
professional and technical standards.
9. CHANGE ORDERS
No change of this Contract, whether for additional work,
additional compensation, or other, shall be effective unless
prior thereto a written change order has been authorized by
the City Council. Employees of the City do not have the
authority to issue change orders.
1~. SUBCONTRACTORS
The Contractor shall employ no subcontractor until City
Engineer or his superior has approved such subcontract in
writing. The City shall not withhold unreasonably such
approval.
Signed as of this
- Attest:
Sheila Brand, City Clerk
Attest:
CORPORATE SEAL
day of
19
CITY 0~' KERRVILLE, TEXAS
BY:
Glenn Brown, City Manager
CITY SEAL
CONTRACTOR:
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Paqe 4
Approved as to form:
Tom Terrell, City Attorney

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INVITATION TO BID
Sealed bids addressed to the City of Kerrville will be received
by the office of the City Clerk, City Hall, 800 Junction Highway,
Kerrville, Texas, 78028, and then publicly opened at 3:00 p.m. on
1987, in City Hall Meeting Room No. 1 for furnishing
all labor and equipment and performing all work required for
SANITARY LANDFILL CLOSURE - PHASE II

in accordance with plans and specifications of the City of Kerrville.
Bids will be received by the office of the City Clerk until 3:00 p.m.
on the date of bid opening, or bids may be delivered to the City Hall, _
Meeting Room No. 1, at 3:00 p.m. on that date. Any bids received after
this date and time will be returned unopened. All bids must be plainly
marked "PROPOSAL FOR SANITARY LANDFILL CLOSURE - PHASE II - DO NOT
OPEN" on the outside of the envelope. When sent by mail, the sealed -
proposal marked as indicated above should be enclosed in an
additional envelope. Plans, specifications, and bidding documents are
on file in the office of the Public Works Department, City Hall,
Kerrville, Texas, 78028. Plans and specifications furnished for
bidding purposes remain the property of City of Kerrville and shall
be returned in good condition within five (S) days after bids are
opened.
All bids shall be accompanied by a Cashier's or Certified Check in
an amount of not less than ten percent (10%) of the total maximum bid
price, payable to City of Kerrville, or an acceptable bid bond in the
same amount as a guarantee that bidder will enter into a contract and
execute performance bond and labor payment bond within ten (10) days after
notice of award to him.
The successful bidder must furnish a performance bond in the amount
of one hundred percent (100%) of the contract price and a labor payment
bond in the amount of one hundred percent (100%) of the contract price
from a surety company acceptable to City of Kerrville.
The City reserves the right to accept only that proposal which is in
the best interest of the City of Kerrville and to accept or reject any or
all..proposals.
To be published
Kerrville Mountain Sun
Sheila L. Brand, City Clerk
City of Kerrville, Texas

INSTRUCTIONS TO BIDDERS
1. PROPOSAL AND CONTRACT FORMS - All bidders shall use only the
proposal form furnished herein which will state the location and description
bf the proposed work, approximate quantities of the various items of work to
be performed for which a lump sum price is asked, and the time in which the
work is to be completed. The proposal form will also contain any special
conditions of agreement or special provisions.
blanks.

The Bidder shall execute the Construction Contract and complete any
2. ESTIMATES OF QUANTITIES - This is a lump sum job. The estimate of
quantities listed in the proposal form shall be considered as approximate and
will be used for comparison of proposals only and not for measurement and
payment. It is understood that quantities may be more or less than the City's
estimate.
3. PLANS, SPECIFICATIONS, AI3D SITEIS) OF WORK - Before submitting a
proposal, the bidder shall examine carefully the proposal, plans, -
specifications, special conditions of agreement, special provisions,
contract forms and site(s) of the proposed work. He shall satisfy himself
as to the character, quality, and quantities of work to be performed. The
submission of a proposal by a bidder shall be conclusive evidence that he
has complied with these requirements. Claims for additional compensation
due to variations between conditions actually encountered in construction
and as indicated by the plans will not be allowed.
4. PREPARATION OF PROPOSAL - The bidder must submit his proposal on
the form furnished herein. The blank spaces in the proposal shall be
correctly completed in ink, as well as the correct name of the individual,
firm, or corporation making the proposal, with signature(s) by the person or
persons authorized to bind the individual, firm, or corporation. The bidder
shall properly acknowledge all addenda in the spaces provided therefor on the
proposal form.
The lump sum bid price shall include sales tax on supplies and
equipment used or consumed in the performance of the contract.
Persons desiring further information or interpretation of the plans
or specifications must make a written request for such information to the
Engineer prior to seven (7) days before the time set for the opening of
proposals: The person submitting the request will be responsible for its
prdtnpt delivery. Any interpretation of the plans, specifications, and
contract documents will be made by addendum only, and a copy of each addendum
will be mailed or delivered to each person to whom a set of such documents
has been furnished. The Engineer will not be responsible for any other
interpretations of the plans, specifications, or contract documents.
5. REJECTION OF PROPOSALS - Proposals containing any omission,
alteration of form, additions or conditions not called for, incomplete bids,
or proposals otherwise regular which are not accompanied by acceptable
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proposal guarantee will be considered irregular and may be rejected. In any
case of ambiguity or lack of clearness in stating the price in the proposal,
the City of Kerrville reserves the right to consider the most advantageous
construction thereof or to reject the proposal. An unreasonable bid price
may be cause to reject any proposal.
6. PROPOSAL GUARANTEE - Each proposal must be accompanied by a
Cashier's or Certified Check, payable to the City of Kerrville or an
acceptable bid bond in the amount of not less than ten percent (10~) of the
total amount bid, as a guarantee that bidder will enter into a contract and
furnish bonds on the forms provided within ten (10) days after notice of award
of contract to him.
7. DELIVERY OF PROPOSAL - Each completed proposal shall be placed,
together with the proposal guarantee, in a sealed envelope clearly identified
on the outside as a proposal for the City of Kerrville, project description,
and name and address of the bidder. 'When sent by mail, the sealed proposal
marked as indicated above should be enclosed in an additional envelope.
Proposals will not be considered unless submitted on or before the time
designated in the Invitation to Bid.
8. WITHDRAWAL OF PROPOSALS - Any bidder, upon his written request,
will be given permission to withdraw his proposal not later than the time set
for the opening thereof.
9. CONSIDERATION OF PROPOSALS - For the purpose of
proposals are opened and read, they will be compared, and
made public. They will then be presented to the City Coin
City of Kerrville reserves the right to reject any or all
technicalities as may be considered for the best interest
Kerrville.
the award, after the
the results will be
zcil for award. The
proposals and waive
of the City of
10. RETURN OF PROPOSAL GUARANTEES - The proposal guarantees accompanying
the proposals may be retained until the contract is awarded and the successful
bidder executes the contract and furnishes the required bonds; after which
they will be returned to the bidders.
11. FURNISHING BONDS - Within ten (10) days after award of the contract,
the successful bidder shall execute the contract and furnish the City of
Kerrville with performance bond and labor bond, each in the full amount of the
contract price, executed by a surety company acceptable to the City of
Kerrville. The bonds are to be furnished as a guarantee of the faithful
performance of the work and for the protection of the claimants for labor.
Should the bidder to whom the contract is awarded refuse to furnish the
required bonds within ten (10) days after notice of award of the contract to
him, the proposal guarantee shall become the property of the City of
Kerrville, not as a penalty, but as liquidated damages.
12. BID INCLUDES EXECUTING CONTRACT - As part of the bid, Contractor
shall execute the "Construction Contract, City of Kerrville" and fill in all
blanks.
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13. APPROVAL OF CONTRACT - The contract will be approved and signed by
the Mayor of the City of Kerrville, Texas. The contract will not be binding
upon the City of Kerrville until it has been executed by the City of Kerrvill~
and delivered to the Contractor.



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PROPOSAL TO THE CITY OF KERRVILLE, TEXAS
Date 1987
Mr. Glenn D. Brown, City Manager
City of Kerrville
800 Junction Highway
Kerrville,, Texas 78028
Dear Mr. Brown:

The undersigned, in compliance with your invitation to bid for the "Sanitary
Landfill Closure - Phase II" for the City of Kerrville, Texas, having examined
the plans, contract documents and specifications, and the site of the proposed
work and being familiar with all of the conditions surrounding construction of
the proposed project, proposes to furnish all labor and equipment and perform
all work required for construction of the project in accordance with the plans
and contract documents and specificiations for the following lump sum price:
				Estimated Quantities	-
Item	Description of		(Not for Measurement	
No.	Project ~ Area ~		and Payment)	Units
1.		Leveling/Smoothing			
		Areas B, C, and D		21	Acres
2.		Embankments (cover),	Area C		
		Ordinary compaction	- 6"	1,093	Cu.Yds.
3.	a.	Embankments (cover),	Area D		
		Ordinary compaction	- 6"	2,694	Cu.Yds.
	b.	Area D, S & SE Perimeter		
		Ordinary compaction	- 24"	2,100	Cu.Yds.
4.	a.	Proof Roll Subgrade,	Area B		
	b:	Impermeable Lift -	6", Stockpile 1		
		.(not less than 100	density of ATSM	D-698-78	
		with maximum moisture)	4,676	Cu.Yds.
	c.	Embankment (cover),	Area B		
		Ordinary Compaction	- 6"	4,676	Cu.Yds.
TOTAL LUMP SUM BID

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Enclosed with the proposal is a (Cashier's or Certified Check payable to the
City of Kerrville) (Bid Bond) in the amount of
(Dollars) (S ).
It is agreed that in the event this proposal is accepted by the City of
Kerrville and the undersigned bidder fails to execute a contract and furnish
performance and payment bonds within ten (10) days after notice of award of
contract to him, the proposal guaranty shall become the property of the City
of Kerrville as Liquidated Damages for delay and inconvenience; otherwise,
said check or bond shall be returned to the bidder after the successful
bidder has executed a contract and furnished the required bonds.
SANITARY LANDFILL CLOSURE - PHASE II
Working Days
The undersigned acknowledges receipt of the following addenda:
Addendum No. 1 dated received
Addendum No. 2 dated received
Addendum No. 3 dated received
tractor
Title
Address
Telephone Number•

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SECTION GC
GENERAL CONDITIONS
GC.1. PERMITS, CERTIFICATES, LAWS, AND ORDINANCES
The Contractor shall, at his own expense, procure any and all
permits, certificates, and licenses required of him by law for the execution
of his work. The owner will furnish permits from the Texas Department of
Highways and Public Transportation and railroad companies for crossing their
properties with utility extensions if such are required.
GC.2. MANUFACTURER'S CERTIFICATES ~.
All manufacturer's certificates required herein are to be
furnished by the Contractor at his own expense.
GC.3. BOUNDARIES OF WORK
The Owner will provide land and rights-of-way for the work -
specified in this contract and make suitable provisions for ingress and
egress, and the Contractor shall not enter on or occupy with men, tools,
equipment or materials any ground outside the property of the Owner without
the written permission of the Owner of such ground. Other contractors and
employees or agents of the Owner may for all necessary purposes enter upon the
work and premises used by the Contractor, and the Contractor shall conduct his
work so as not to impede unnecessarily any work being done by others on or
adjacent to the site.
GC.4. PROTECTION OF THE SITE
The Contractor shall protect all structures, walks, pipelines,
trees, shrubbery, lawns, and other improvements during the progress of his
work and shall remove from the site all debris and unused materials.
GC.S. TESTING OF MATERIALS
All testing shall be performed by an approved agency for testing
materials. The selection of the laboratory and the payment for such services
sha•11 be made by the Owner.
GC.6. EXAMINATION OF SITE OF THE PROJECT
Prospective bidders shall make a careful examination of the site of
the project, soil and water conditions to be encountered, improvements to be
protected, disposal sites for the surplus material not designated to be
salvage materials, and methods of providing ingress and egress to private
properties.
GC - 1

GC.7. BARRICADES AND DANGER SIGNALS

Where the work is performed in or adjacent to any street, alley, or
public place, the Contractor shall (at his own cost and expense) furnish and
erect barricades and/or fences and lights and/or danger signals for the
protection of persons or property. Barricades shall be painted with a
reflectorized paint or scotchlite tape. From sunset to sunrise the Contractor
shall furnish and maintain lights at each barricade. Barricades shall be
erected to endeavor to keep vehicles from being driven on or into any work
under construction.
The Contractor will be held responsible for all damage to the work
because of the failure of barricades, signs, lights, and watchmen to protect
it; and whenever evidence is found of such damage, the Engineer may order the
damaged portion immediately removed and replaced by the Contractor at this
cost and expense:' The Contractor's responsibility for the maintenance of
barricades, signs, and lights and for providing watchmen shall not cease until
the project has been accepted by the Owner.
GC.B. COMPETENT WORKMEN
The Contractor shall employ only competent workmen for the
execution of this work, and~all such work shall be performed under the direct-
supervision of an experienced superintendent.
GC.9. CONTRACTOR'S INSURANCE
The Contractor shall not commence work until he has obtained all the
insurance required under this paragraph and such insurance has been approved
by the City and evidence of paid policies has been filed with the City.
A. During the life of the Contract, the Contractor shall furnish
and maintain Workmen's Compensation Insurance meeting statutory limits to
include employers liability with a limit of $100,000 for each accident
and Comprehensive General•Liability (to include contractual liability
endorsement), and Broadform Property Damage Insurance. General Liability and
Property Damage Insurance shall be in amounts as follows:
$500,000 Combined Single Limit Bodily Injury and
$500,000 Excess Coverage Property Damage
The City of Kerrville is to be listed as additionally insured.
.. B. Scope of Insurance and Special Hazards
The insurance required under Subparagraph A hereof shall provide
adequate protection for the Contractor and the City, respectively, against
damage claims which may arise from operations or hazards under this contract,
whether such operations were by the Insured or by anyone directly or
indirectly employed by him in the performance of this contract, in the amounts
as shown in Subparagraph A above.
GC - 2

C. Proof of Carriage of Insurance
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Current, valid insurance policies meeting the requirements
herein identified shall be maintained during the duration of the named
project. Renewal certificates shall be sent to the City thirty days prior to
any expiration date. Certificates will reflect amounts of coverage and
expiration dates. Certificates will be written to reflect the above (not
endeavor), and/or policies will be endorsed to reflect the above. Every
certificate (whether original or renewal) shall provide that the policy
cannot be cancelled except upon thirty days' written notice to the City.
GC.10. PERFORMANCE BOND
The Contractor must furnish a performance bond in the amount of one
hundred percent (100$) of the contract price and a labor payment bond in the
amount of one hued"red percent (100$} of the contract price from a surety
company acceptable to the City of Kerrville.
furnished
constitute
GC.11
This Contract shall not be effective until the Contractor has
the above-mentioned bond. Failure to keep the same in force shall
a default of this Contract. -
WAGE RATES
The attention of the bidder is directed to the fact that the
Contractor must pay wages which comply with any state or federal wage law that
may be applicable. The Contractor shall pay the local prevailing wage for
work of this section.
GC.12. COMPLIANCE WITH O.S.H.A.
Contractor shall comply with all provisions of the Safety and Health
Regulations for Construction and any other applicable sections of the
Occupational Safety and Health Act of 1970. Neither the Owner nor the
Engineer sha11•be responsible for advising the Contractor of specific
requirements or for enforcing any requirements of the Act.
GC - 3

SECTION EC
SPECIAL CONDITIONS - EMBANKMENT (COVER)
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EC.1. DESCRIPTION
This item shall govern the placement and compaction of all materials
obtained from borrow excavation for utilization in the construction of
landfill final cover.
EC.2. CONSTRUCTION METHODS
A. General
Prior to placing any embankment cover, leveling operations shall
have been completed on the areas over which the embankment is to be placed.
Depressions in the limits of the embankments shall be backfilled with suitable
adjacent material and compacted by approved methods before commencing
embankment construction. All surfaces of the landfill within the "Limits of
Leveling and Smoothing" shown on the plans shall be bladed or smoothed.
Trees, stumgs, roots, vegetation, or other unsuitable materials
shall not be placed in embankment.
Except as otherwise required by the plans, all embankments shall
be constructed in layers approximately parallel to the finished and smoothed
grade of the existing landfill.
• Embankments shall be constructed to the grade established by the
City's Closure Plan, and completed embankments shall correspond to the general
slope(s) of the Closure Plan. After completion of the embankment cover, it
shall be continuously maintained to its finished section and graded until the
project is accepted.
•
B. Classification of Embankments
Embankments shall be defined as those composed of all
material(s) including rock and shall be constructed of accepted material from
approved sources provided by the City on the site.
Except as otherwise specified, embankments shall be constructed
in successive layers for the full dimensions of the landfill section and in
such lengths as are best suited to the sprinkling and compaction methods
utilized. •
Layers of embankment may be formed by utilizing equipment which
will spread the material as it is dumped, or they may be formed by blading or
other acceptable methods from piles or windrows dumped from excavating or
hauling equipment in such amounts that material is evenly distributed.
EC - 1
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Minor quantities of rock encountered in constructing earth
embankments shall be incorporated in the specified embankment layers. Rock
also may be placed outside the limits of the completed landfill cover area
where the size of the rock prohibits their incorporation in the normal
embankment layers (as directed by City).
Each layer of embankment shall be uniform as to material,
density, and moisture content before beginning compaction. Where layers of
unlike materials abut each other, each layer shall be feather-edged for at
lease one hundred feet or the material shall be so mixed as to prevent abrupt
changes in the soil. No material placed in the embankment by dumping in a
pile or windrow shall be incorporated in a layer in that position, but all
such piles or windrows shall be moved by blading or similar methods. Clods
or lumps of material shall be broken, and the embankment material mixed by
blading, harrowing, disking, or similar methods to the end that a uniform
material of uniform density is secured in each layer. Water required for
sprinkling to bring the material to the moisture content necessary for maximum
compaction shall be evenly applied, and it shall be the responsibility of the
Contractor to secure a uniform moisture content throughout the layer by such
methods as may be necessary. In order to facilitate uniform wetting of the
embankment material, the Contractor may apply water at the material source iŁ.
the sequence and methods used are such as not to cause an undue waste of
water. Such procedure shall be subject to the approval of the City. Water -
will be furnished by the Contractor.
Compaction of embankments shall be obtained by the method
hereinafter described as "Ordinary Compaction."
EC.3. ORDINARY COMPACTION
When the Ordinary Compaction method is specified, the following
provisions shall govern: Each layer shall not exceed eight inches of loose
depth and shall be compacted until there is no evidence of further compaction.
Prior to and in conjunction with the rolling operation, each layer shall be
brought to the moisture content ordered by the City and shall be kept leveled
with suitable equipment to insure uniform compaction over the entire layer.
EC.4. DENSITY CONTROL
When the Density Control method of compaction is specified, each
layer.shall be compacted to the required density by any method, type, and
size of equipment which will give the required compaction. The depth of
layers prior to compaction shall depend upon the type of sprinkling and
compacting equipment used. Prior to and in conjunction with the rolling
operation, each layer shall be brought to the moisture content necessary to
obtain the required density and shall be kept leveled with suitable
equipment to insure uniform compaction over the entire layer. Testing for
density will be in accordance with A.S.T.M. D-698-78.
For each layer of embankment and select material, it is the intent
of this specification to provide the density as required herein, unless
otherwise shown on the plans. Swelling soils (soils with plasticity index of
EC - 2



20 or more) shall be sprinkled as required to provide not less than optimum
moisture and compacted to the extent necessary to provide not less than one
hundred percent of the density as determined in accordance with A.S.T.M
D-698-78. Field density determination will be made in accordance with
approved methods.
After each layer of earth embankment or select material is complete,
tests will be made by the City, as necessary. If the material fails to meet
the density specified, the course shall be reworked as necessary to obtain the
specified compaction, and the compaction method shall be altered on subsequent
work to obtain specified density. Such procedure shall be determined by and
subject to the approval of the City.
A. Proof Rolling
Proof rolling to test the uniformity of compaction of the
subgrade prior to placement of embankment cover is required. Proof rolling
must follow leveling or smoothing and is not a separate pay item. All
irregularities, depressions, and weak or soft spots which develop shall be
corrected immediately by the Contractor. The ordinary compaction method shall
be followed for subgrade proof rolling. _
Should the subgrade, due to any reason or cause, lose the
required stability, density, or finish before the embankment cover is placed,
it shall be recompacted and refinished at the sole expense of the Contractor.
Excessive loss of moisture in the subgrade shall be prevented by sprinkling,
sealing, or covering with a subsequent layer of material. Excessive loss of
moisture shall be construed to exist when the subgrade soils moisture content
is more than four percent below the optimum of compaction ratio density.
B. Acceptable Machinery
1. Rolling (heavy tamping) compaction equipment shall consist
of two or three metal drums, rolls, or shells of sixty inches minimimum
diameter. If the two-drum type is furnished, each drum shall be not less than
sixty inches in length. If the three-drum type is furnished, the roller shall
consist of two forward drums and one rear drum, the drums to be so arranged
that. the rear drum will compact the space between the two forward drums.
Rollers of this type shall have an overall width of not less than ten feet.
The.dr'ums shall be unit-mounted in a rigid frame in such manner that each drum
may oscillate independently of the other.
Each drum shall be surmounted by metal studs with tamping
feet projecting not less than seven inches from the surface and shall be so
spaced as to result in one tamping foor for each 0.65 to 0.70 square foot of
drum area. The area of each tamping foot shall be approximately seven square
inches. All rollers shall be provided with cleaning teeth so designed and
attached as to prevent the accumulation of material between the tamping feet.
The roller shall be so designed that by ballast loading the
load on each tamping foot may be varied up to at least 550 pounds per square
inch of cross-sectional area. The load per tamping foot will be determined by
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dividing the total weight of the roller by the number of tamping feet in one
row parallel to or approximately parallel to the axis of the roller.
One tamping roller, consisting of two drums or three drums,
conforming to the above requirements shall be drawn by a tractor of adequate
tractive effort capable of moving the roller unit at variable uniform speeds
up to approximately three miles per hour. Where turning is impractical or
detrimental to the work, the roller shall be attached to the front end of the
power equipment. When operations are confined to narrow widths, one roller,
either pushed or pulled by adequate power equipment, shall be considered a
roller unit.
2. Rolling (pneumatic tire) compaction equipment shall consist
of not less than seven pneumatic tire wheels, running on axles in such a
manner that the rear group of tires will cover the entire gap between adjacent
tires of the forward group and mounted on a rigid frame provided with a
loading platform or body suitable for ballast loading. The front axle shall
be attached to the frame in such a manner that the roller may be turned within
a minimum circle. Under working conditions, the pneumatic tire roller shall
have an effective rolling width of approximately sixty to eighty-four inches
and shall be so designed that, by ballast loading, the total load may be -
varied uniformly to suit soil conditions and compaction requirements. The
roller shall be equipped with tires that will afford ground contact pressure -
of forty-five pounds per sugare inch or more with the ground contact pressure
governed by the ballast loading.
The operating load and tire air pressure shall be within the
range of the manufacturers charts or tabulations showing the contact areas
and contact pressures for the full range of tire inflation pressure and for
the full range of loadings for the particular tire furnished. The roller
under working conditions shall provide a uniform compression under all wheels.
Individual tire inflation pressures shall be within a plus or minus five
pounds per square inch of each other. The pneumatic tire roller shall be
drawn by either a crawler-type or a pneumatic tire tractor or may be self-
propelled. The power propulsion unit shall have adequate tractive effort to
properly move the roller unit at variable uniform speeds up to approximately
five miles per hour.
3. Rolling (heavy pneumatic) compaction equipment shall consist
of not less than four pneumatic tire wheels, running on axles carrying not
more than two wheels, and mounted in a rigid frame and provided with a loading
platform body suitable for ballast loading. All wheels shall be arranged so
that they will carry approximately equal loads when operating on uneven
surfaces.
Under working conditions the roller shall have a rolling
width of from eight feet to ten feet and shall be so designed that, by ballast
loading, the gross load may be varied uniformly from twenty-five tons to fifty
tons. The tires shall be up to one hundred fifty pounds per square inch. The
operating load and tire air pressure shall be within the range of the
mnaufacturer~s charts of tabulations showing the contact areas and contact
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pressures for the full range of loadings for the particular tire furnished.
Tires shall be practically full of liquid. (Tires shall be considered as
being practically full when liquid will flow from the valve stem of a fully
inflated tine with the stem in the uppermost position.)
The heavy pneumatic tire roller shall be drawn by either a
crawler-type or a pneumatic tire tractor or may be self-propelled. The power
propulsion unit shall have adequate tractive efrort to properly move the
roller unit at variable uniform speeds up to approximately six miles per hour.
EC.S.
AND PAYMENT
The quantities in the Proposal have been estimated by the City
and are. not for measurement and payment. To determine project completion,
measurement of cover material depth will be done by the City on areas C and D.
Measurement of Area B will be accomplished by an independent testing
laboratory at the expense of the City.