HomeMy WebLinkAboutBID - 5361 HOWES STREET OUTALL PHASE 1 AND 2 (2)City of Fort Collins
AML
Admi. trative Services
Purchasing Division
CITY OF FORT COLLINS
BID ADDENDUM NO. 2
MAY 5, 1999
Bid No 5361
Project Name Howes Street Outfall - Phase I and 11
Opening Date 2 00 p in (our clock) May 5, 1999
NEW OPENING DATE 2 00 p in (our clock) MAY 13, 1999
NOTICE TO ALL KNOWN PLAN HOLDERS AND BIDDERS
The OWNER issues this addendum to all known individuals, Finns, or corporations who have obtained
or received Drawings and Contract Documents for the above referenced project
THIS ADDENDUM SHALL BE MADE A PART OF THE CONTRACT DRAWINGS AND
CONTRACT DOCUMENTS. BIDDERS SHALL ACKNOWLEDGE RECEIPT OF THIS
ADDENDUM IN THE APPROPRIATE SPACE PROVIDED ON THE BID FORM. FAILURE
TO ACKNOWLEDGE RECEIPT OF AN ADDENDUM MAY BE CAUSE FOR REJECTION
OF THE BID. ALL OTHER TERMS AND CONDITIONS OF THE CONTRACT
DOCUMENTS REMAIN UNCHANGED. THIS ADDENDUM CONTAINS 87 PAGES.
Bid Addendum No. 2 is as follows:
A ']'he bid opening date and time is changed to May 13, 1999, at 2 00 p in Location
remains the same
B Division I— General Requirements Revisions
C Division II — Site Work Revisions
D Drawing Revisions
E List of Attendees to Pre -Bid Conference
F Geotechnical Report for the Project
G List of Plan Holders
A synopsis of the Pre -bid Conference and Meeting Agenda is attached to this addendum for
informational purposes These items are not considered a part of Bid Addendum Number 1
256 W Mountain Avenue • PO Box 580 • LWA;i&Pi M'2�?0980 • (970) 221-6775 • FAX (970) 221-6707
HOWES STREET OUTFALL— PHASE I & H
PRE -BID MEETING
APRIL 29,1999, 9:00 AM
AGENDA
1 Introductions
2 Project Owner is the City of Fort Collins Water Utility Department
ICON Engineering, Inc' is the design engineer and will have a full time inspector on site and will
provide construction observation and schedule materials testing for the Owner Bates Engineering
Inc and Jim Sell Design will also provide observation for structural & landscaping work items
Doug Williams, of ICON, can be contacted at (303) 221-0802 for questions prior to bid opening
Bid Opening scheduled for May 13, 1999 at 2 00 pm
Bid requirements — comments by City Purchasing Department
A Site visit will be conducted at the end of the meeting for all interested parties
7 The project is being constructed on property owned by the City of Fort Collins and the Burlington
Northern Santa Fe Railroad (BNSF) The project limits are Martinez Park on the north, to the south
side of Cherry Street on'ithe south end of the piolect
8 Contract Time is 120 consecutive calendar days for Phase I work (Substantial Completion) Within
this period the following must be completed (refer to 00520 and 01145)
a Work in Martinez P U D
b Work in BNSF R-O-W
c Work in Cherry Street
Contract time is 45 consecutive calendar days for Phase II work (Substantial Completion) Work for
Phase II will commence ion September 15, 1999 (refer to 00520 and 01145)
10 Items to note
a Measurement and payment section refers to each item on the bid schedule (01270)
b Coordination, will be important
Work in BNSF nght-of-way to be coordinated City has/will have permit Note
insurancc�reguirements (00800) and construction requirements (01145)
North Weld County waterline has been encased Contractor shall coordinate with
North Weld County when constructing over line
City`s Electrical Department has a major electrical duct bank that crosses the pr4ject
lust north of Cherry Street Specialty requirements are outlined for work in this area
(01535)
Page 4 of PAe-bid Conference Synopsis
Contractor will have to coordinate his work with Public Service for removal of an 8-
inch high pressure gas line in Cherry Street
I
Contractor will have to coordinate with the City's water utility for lowering a 6-inch
waterline in Cherry street
Contracts r shall coordinate with City's Parks Department when working in Martinez
Park
c Staging areal may be available on the east side of the bike path adjacent to Martinez Park
d Protection of trees and vegetation are important (01715)
e The Traffic I Control and Erosion Control Plans are included for bidding purposes
Contractor will have to submit his own plans for approval
11 Review of construction drawings
12 Questions
I
13 Site visit (Park in area east of path, north of Cherry Street)
Page 5 o/ Pi e-bud Goa/erence SynopmA
Ah
PARTI GENERAL
101 SEC 1 ION INCLUDES
SECTION 02740
FLEXIBLE PAVEMENT
A This section covers paving of all new and existing asphalt surfaces Existing
pavement is to be replaced with similar material as herein set forth
102 RELATED SECTIONS
A Section 02315 —Trenching, Bedding, and Backfillmg
B Section 02710 — Aggregate Base Course
103 QUALITY ASSURANCE
A Test samples will be taken in the field by the OWNER'S independent testing
service Mix designs and material samples are to be submitted for review at least
4 weeks prior to material placement All sampling and testing shall be done in
accordance with the latest methods of AASHTO, unless otherwise specified
B When placing the asphalt trench patch, saw cutting of the existing asphalt will
not be permitted within the wheel path of a travel lane All asphalt patches shall
conform to the specifications outlined in the City of Fort Collins Design and
Construction Standards for Streets of Public Right-of-way, "Construction
Details" section
PART PRODUCTS
201 MATERIALS
A Cationic Emulsified Asphalt The cationic emulsified asphalt for the tack coat
shall be CSS-lh and shall meet the requirements of AASHTO M 208 (ASTM C
2397)
B Asphaltic Concrete Surface Course
1 Description — The asphaltic concrete surface shall consist of a mineral
aggregate, uniformly mixed with asphalt cement The mineral aggregate
shall be 100% crushed gravel
2 Materials
a Crushed Gravel The crushed gravel shall consist of clean, hard,
durable particles which have been crushed to the following
gradations (In accordance with the City of Fort Collins Design
and Construction Standards for Street and Public Right-of-way)
Howes Street Outfall 02740-1 Flexible Pavement
Phase I & II
4-05-99
I
TABLE 1
MATERIAL SPECIFICATIOS FOR
HOT BITUMINOUS PAVEMENT
,tn {i(t „t„` •+` t;„(It ,+,,�;u; PFS t"•,;�•,,,i -,�S;-{8 +d, ;;;,••y{,•, i, „r",,,,,•,,•x„ t
s t E`,�,t•,' tr tit
�,�, `' _„{t ;a,Gli' ��9,1 { ,4 {,, ,i' i'"i'',i,{ ,t•• ' ta3';.$;'a''�,,,{tt, I ",n
`i�e'k, ,,,,{,,,f ,,,� a'4i'' ,a.'i" .,j1tll,r; a;•',+ti; Xtk'E ,k'x4s � rc;', ,ei� ,t}i,,,t,„k a ,,,
H,•,a,.Sieve'Size'tor,TesYErocedur,e a''',;� ,t Per"cent;Passing;or'TestRegmrement`,-''^?'";liti'
i`�hii,i,,r,eea'h, r'+,,
i,,,yt „Sil; �itsu! {t"' i''I� R}i,", ytlty,�• t, „" t, ��E�,•`t,'I;! y {u'"vS¢VP
;P}';'l 2P'„`;•Vwl!',x--n, 'l,� Y,'r „tlY
>',G{ MIX.('; 4p„+' 1hr;iE; (�; �; C; M1X^,Eit'!''v„ j ;,iah,,;�' '�1,F''Mlxs I,t ,0"
E{ki{N'hh;;;f; ° i;i `;''i d+ ;; ' ;;tyiq'1 i{S;E, `'{` {� 3yd��';'� 1`�'S{` pi•� '{9 -;I ,} a �;i; "';;! `-i
,oaS°sQ;'+F" 'i'Yd 1.,,dd;Ja; i 21,.,dtp,'„{'• ,.,,;,,,lid,t�,;,}6, ,, t![ Se��;'� d; ai• ,.t =d i•
1 '/2" 100
V 90-100 100
3/4" 63-85 90-100 100
%" 46-78 70-89 90-100
3/$1,
60-88 74-89
#4 22-54 44-72 50-78
#8 13-47 30-62 32-64
#30 4-26 12-38 12-38
#200 1-7 3-7 3-7
% Wear, AASHTO T-86 45, Max 45, Max 45, Max
Two or moreFractuxed Faces on +4 50, Min 50, Min 50, Min
Tensile Strength Ratio 75, Min 75, Min 75, Min
ASTM D 14867 Lottman Test
Plasticity Index 6, Max 6, Max 6, Max
b Aggregates shall not contain clay balls, organic matter,
or other deleterious substances
c An additive may be used to meet the requirement for
Index of Retained Strength, if necessary Such additives
may be hydrated lime, Type I Portland Cement, or anti -
stripping agents approved by the Colorado Department
of Transportation
d The asphalt cement used shall be Grade AC-10 unless
otherwise directed by the City of Fort Collins
Engineering Department
The crushed gravel shall show no detrimental amount of stripping when
tested'as follows
A test sample consisting of the aggregate and bitumen to be used in the
paving mixture shall be mixed at the temperature specified herein The
sample shall then be spread in a loose, thin layer and allowed to air -
season for 24 hours betore testing A portion of the sample, not over %z
of the capacity of the jar, shall be placed in a glass jar and completely
covered with distilled water The jar shall be fitted with a tight screw
cap and allowed to stand for a period of 24 hours The jar shall be
vigorously shaken for a period of 15 minutes and the sample of the
mixture shall then be examined for stripping If stripping occurs, the
aggregate shall be rejected or an approved method of treating shall be
Howes Street Outfall 02740-2 Flexible Pavement
Phase I & II
4-05-99
specified to change the material from a hydrophilic to a hydrophobic
state as directed by the ENGINEER
b Asphalt Cement The asphalt cement shall be uniform in character, free
from water, and shall not foam when heated to 347F It shall meet the
following requirement's for penetration
Minimum R Value 95
The viscosity graded asphalt shall be homogeneous, free from water, and
shall not foam when heated to 347F (175C) The viscosity graded
asphalt cement shall conform to all of the following requirements of the
Standard Specifications for Viscosity Graded Asphalt Cement AASHTO
Designation M226 and modifications thereto Asphalt cement shall be
AC-10 unless otherwise approved by ENGINGEER
GRADE AC-10
TEST AC-10
Viscosity, 140F (60C), Poises 1000 +l- 200
Viscosity, 275F (135C),
Cs -minimum
150
Penetration, 77F (25C),
100g, 5-sec min
70
Flash Point, COC, F (C)
-minimum
425 (219)
Solubility in Trichlorethylene,
%-minimum
990
TESTS ON RESIDUE FROM THIN-FILM OVEN TEST
Viscosity, 140F (60C), Poises -minimum 4000
Ductility, 77F (25C), 5 cm per minute
cm-mimmum 50
SPOT TEST
Standard Naphtha Solvent Negative
Naphtha-Xylene Solvent Negative
An AASHTO T 179 (Thin -Film Oven Test) may be used, but AASHTO T240
shall be the referee method
Howes Street Outfall 02740-3 Flexible Pavement
Phase I & I1
4-05-99
202 PAVING PLANT R QUIREMENT
A General Regdirements
i
1 Uniformity The plants shall be so designed, coordinated and operated as
to produce a mixture within the job mix tolerances as covered in
paragraph 2 03C under "Preparation and Composition of the Mixture "
2 Equipment for Preparation of Asphalt Tanks for storage of asphalt shall
be capable of heating the material, under effective and positive control at
all tunes, to temperature requirements set forth in the Specifications
Heating shall be accomplished by steam coils, electricity, or other means
such Ithat no flame shall come in contact with the heating tank A
circulating system for the asphalt shall be provided of adequate size to
ensure the property and continuous circulation between storage tank and
mixer during the entire operating period All pipelines and fittings shall
be steam jacketed or other properly insulated to prevent heat loss
Storage tank capacity shall be sufficient for at least one day's run
Dryer A rotary dryer of any satisfactory design for drying and heating
the nimetal aggregates shall be provided The dryer shall be capable of
drying and heating the mineral aggregate to the temperature requirements
set forth in the Specifications
Screens Plant screens, capable of screening all aggregates to the size
required for proportioning, and having normal capacities slightly in
execs Is of the full capacity of the mixer, shall be provided The mesh of
the screens shall be approved by the ENGINEER before paving
operations
Bins I The plant shall include a minimum of 3 dry aggregate storage bins
with the total capacity of not less than 3 times the dead load capacity of
the mixer Each bin shall be provided with an overflow pipe that shall be
of such size and at such locations as to prevent any backing up of
material into other bins Each bin shall have a suitable convenient means
for sampling The sampling openings shall be subject to the approval of
the ENGINEER
Thermometric Equipment An armored thermometer reading from 200F
to 500F shall be fixed in the asphalt feed line at a suitable location from
the discharge valve at the mixer unit The plant shall be further equipped
with an approved dial scale mercury actuated thermometer, an electric
pyrometer, or other approved thermometric instrument so placed at the
discharge chute of the dryer as to register automatically or indicate the
temperature of the heated aggregate
I
Dust Collectors When plants are located in any vicinity where dust may
be objectionable, or when dust interferes with the efficient operation of
the plant, proper housing, mixer covers, dust collecting systems shall be
installed Provision shall be made to waste the material so collected or to
returnlit uniformly to the mixture as the ENGINEER may direct
Howes Street Outfall 02740-4 Flexible Pavement
Phase I & II
4-05-99
0
8 Safety Equipment Adequate and safe stairways to the mixer platform
and guarded ladders to other plant units shall be placed at all points
required for accessibility to all plant operations All gears, pulleys,
chains, sprockets, and other dangerous moving parts shall be thoroughly
guarded and protected Ample and unobstructed passage shall be
maintained at all times in and around the truck loading space This space
shall be kept free from drippings from the mixing platform
B i Special Requirements of Batch Plants
Plant Scale Scales for any weight box or hopper may be either of the
beam or springless dial type and shall be a standard make and design,
sensitive to 1I2 of 1% of the maximum load that may be required When
of the beam type, there shall be a separate beam with telltale indicator for
each size aggregate and a tare beam for balancing the hopper
2 Control of Mixing Time The plant shall be equipped with an approved
means to govern the time of mixing and to maintain it
3 Weight Box or Hopper The equipment shall include a means for
accurately weighing each bin size to hold a full batch without hand
raking or running over The weight box or hopper shall be supported on
fulcrums and knife edges so constructed that they will not be easily
thrown out of alignment or adjustment Gates on both bins and hopper
shall be so constructed as to prevent leakage when they are closed
I
4 Asphalt Bucket The asphalt bucket which is used for weighing the
asphalt cement shall have sufficient capacity to hold not less than 10% of
the weight of aggregate required for one batch It shall be steam jacketed
or equipped with properly insulated electric heat units and shall be
suspended on dial scales or beam scales equipped with a telltale indicator
so that the tare weight of asphalt cement can be measured accurately to
within 2% above or below the weight required The bucket shall be so
arranged that it will deliver the molten asphalt cement in a thin uniform
sheet or in multiple streams the full width of the mixer
5 Mixer Unit The plant shall include a batch mixer of an approved twin
pugmill type or rotary drum type and shall be capable of producing a
uniform mixture within the job mix tolerances fixed by these
Specifications It shall have a batch capacity of not less than 2,000
pounds
If of the pugmill type, wom or improper pugmill paddles will not be
permitted A mechanical batch counter shall be installed and shall be so
designed as to register upon only the actuation of the asphalt bucket
release and to preclude the register of any material through the operation
of pulling bins
C Special Requirements for Continuous Mixing Plants
I
Howes Street 6 utfall 02740-5 Flexible Pavement
Phase & II
4-05-99
I
Gradation Control Unit The plant shall include a means of accurately
proportioning each bin size of aggregate either by weighing or by
volumetric measurement When gradation control is by volume, the unit
shall1have an accurately controlled individual gate to form an orifice for
volumetrically measuring the material drawn from each respective bin
compartment Indicators shall be provided on each gate to show the gate
opening in inches
Weight Calibration or Aggregate Feed The plant shall include a means
for calibration of gate openings by means of weight test samples The
materials led out of the bins through individual orifices shall be bypassed
to a suitable test box, each compartment material confined in a separate
box section The plant shall be equipped to handle conveniently such
test samples weighting up to 800 pounds and to weigh them on accurate
scales
Synchronization of Aggregate and Asphalt Feed Satisfactory means
shall be provided to afford positive interlocking control between the flow
of aggregate from the bins and the flow of asphalt from the meter or
other' proportioning sources This control shall be accomplished by
interlocking mechanical means or any positive method under the control
of the ENGINEER
4 Mixer Unit for Continuous Method The plant shall include a continuous
mixer of an approved twin pugmill type, and shall be capable of
producing a uniform mixture within the job mix tolerance fixed by these
Specifications The paddles shall be of a type adjustable for angular
position on the shafts and reversible to retard the flow of the mix The
mixer, shall carry a manufacturer's plate giving the net volumetric
contents of the mixer at the several heights inscribed on a permanent
gauge, and also giving the rate of feed of aggregate per minute at plant
operating speed
Unless otherwise required, determination of mixing time shall be by
weight methods under the following formula The weights shall be
determined for the job by tests made by the ENGINEER
Mixing time in seconds = Pulmull dead capacity n pounds
Pugmill output in pounds/seconds
The mixing time shall be approved by the ENGINEER
2 03 PREPARATION OF MATERIAL
A Preparation of Asphalt Cement The asphalt cement shall be heated at the paving
plant to a temperature not exceeding 325F The penetration of the asphalt cement
shall be maintained within the limits of penetration specified through the period
of us
B Preparation of Mineral Aggregates The mineral aggregates shall be dried and
heated at the paving plant so that when delivered to the mixer, they shall be at as
Howes Street Outfall 02740-6 Flexible Pavement
Phase i & II
4-05-99
,:
low a temperature as is consistent with proper mixing and laying, and in no case
to exceed 350F They may be fed simultaneously into the same drier but in all
cases, immediately after heating, they shall be screened into three or more bins
The screen sizes shall be approved by the ENGINEER prior to the start of
construction
C i Preparation and Composition of the Mixture Each size of hot aggregate, the
mineral filler and the asphalt cement shall be measured separately and accurately
to the proportions in which they are to be mixed After the hot aggregate and
mineral filler have been charged into the mixer and thoroughly mixed as directed
by the ENGINEER, the asphalt cement shall be added and the mixing continued
for a period of at least 20 seconds, or longer if necessary, to produce a
homogeneous mixture, in which all particles of the mineral aggregates are coated
uniformly
The constituents of the surface course shall be combined in such proportions to
produce a mixture conforming to the following gradations
-i !'v „"", t ` {"r,!
{P�ii,tmt,i�'t tyj;I (>3lifl,<i lI'll i'IIv'7`'!`ty`
!yt "lit i{jti) n t�i' ebi�ii�`'^_n{
"'SieveFSize, otT6st PTOceC1UTii'ti
tt �tii {illb- �IHUIJ, ,� ii ��t 43 lit' �
�! t9 Y11Ii{ii i� I (A ti i{ �j1(�k 4�t tl ti i { { t { t I'l!t. Et
!IHIIIIHIjG
tI i !tt ' 14 t ti !f 3t ! S ! I I! ti t�,t i i
s,,{(ht,na,,!t,1'liW-il,'
t", P , ii='l, A,+ ,°{i+P
, i'',ih ,,,, �'j! it.
a tt},iy'tr, d° d, ^—h ` 'tit='n i!tk'1+;bit {'I
,dr;PeTCent�PaSSting OYy�heSi_R0CIU1Cenl�entr!!g,�m`ytr, ,y
,,'`rl,�,�,,+t,,,1r ti d � °r{ 1 t Fr , i /'v��T14 ,i
+ E� f Mix 111! L !It- t� lr�Miitt i ji i t� l..A. IYltx4'F� �t
'it !i i, , "J!` I. Y ! tit, ! � i 4 {' t R t rt{, '€ }Xt
,R`, i6+l ii+'!'�+eti,,!n'71�-i'! ii, ,i4'+j-fiS ',jt4t np �
I %"
100
I"
90-100
100
3/4"
63-85
90-100
100
%"
46-78
70-89
90-100
1/11,
60-88
74-89
#4
22-54
44-72
50-78
#8
13-47
30-62
32-64
#30
4-26
12-38
12-38
#200
1-7
3-7
3-7
% Wear, AASHTO T-86
45, Max
45, Max
45, Max
Two or more Fractured Faces on +4
50, Min
50, Min
50, Min
Tensile Strength Ratio
75, Min
75, Min
75, Min
ASTM D-4867 Lottman Test
Plasticity Index
6, Max
6, Max
6, Max
EN,'_',!�,�;,tkt��t�,,,{{,;
To be determined by job mix formula
After the job mix formula is established, all mix furnished for the project shall
conform to within the range of tolerances in Table 2 provided below
i
i
Howes Street Outfall 02740-7 Flexible Pavement
Phase I & i1
4-05-99
TABLE 2
MIX TOLERANCES
Maximum Size
+1- 0 Percentage Points
Passing No 4 and Larger
+/- 8 Percentage Points
No 18 to No 30
+/- 6 Percentage Points
Passing No 200
+/- 2 Percentage Points
Asphalt Content
+/- 0 3 Percentage Points
I
RAP > 1 1%, then +/- 0 4 Percentage Points
Discharged Mix Temperature
+/- 20 F
Mix (tolerances shall conform to within ranges shown on Table I
The mix design shall be performed using Hveem Procedures as outlined in
AASHTO T 1246 or ASTM D1560 Mix design parameters for each of the
procedures are shown in Table 3
TABLE3
MIX DESIGN CRITERIA
hs` I 'N' t` ti °'`'TEST; '3,''d'i''''`''j 'a�'i'„ii5
`; `',;' t '„,, t ,tli AY ;'
,H 1l,{,_'F di'y , 3,,t,�ti', it,ivt,j_ ,, `'lni
'���'I {; � .1, i'''i '����r'l�€�11?ittjL €a=,E;�H!€,,,
t ''w� t �l it , ,'€'tlt, 'al„ i,t� ' 1 d!t
,"",ttm„ytt =do, ;t=l,'I,�
f! _Hveem`'AASHTO'T,=246h , „t',
ti'iu6; t ,i , ,€, dL , ,,,,�o , ;':,c 5
I�(� , �t,ypY�'�1„=t,t,,(Pm(l�nti%P .",j=;!p'i,N..+-;t?t'il='-
i='€i'"t hi d i rip, ,ii€a i t€ifl fi� r€'14,€0 ,yit"!,"
S 35 Min
VStrength
MA, (C Mix)
12, Min
VMA, (CX Mix)
13, Min
VMA, (G Mix)
11, Min
Air Voids, Total Mix, %
3-5
D Paving Plantl Inspection For the verification of weights or proportions and
character of materials and determination of temperatures used in the preparation
of the mixture, the ENGINEER or his authorized representative shall have access
at any time to, al parts of the paving plant
PART 3 EXECUTION
3 01 SURFACE PREPARATION
A All final pavement cuts shall be made in straight lines using saw cut Initial
pavement cuts may be made using wheel cut or other suitable method
B Prior to placg the prime coat, the base course shall be thoroughly cleaned
Loose material shall be removed from the existing surface as directed by the
ENGINEER
3 02 PRIME COAT
A All previously prepared bases or existing surface shall be primed with a cationic
emulsified asphalt in accordance with the requirements of these Specifications,
and at the locations that are shown on the Plans or as directed by the
ENGINEER I The prime coat shall be placed by means of an approved pressure
Howes Street Outfall 1 02740-8 Flexible Pavement
Phase I & H
4-05-99
B. DIVISION I - GENERAL REQUIREMENTS
REVISIONS
Section 01270 —Measurement and Payment
Mobilization
Revise the second sentence in the first paragraph from "fencing around project work areas" to
"fencing around project work areas and staging area "
6 Removal of Structures and Obstructions
Add the following to the last sentence in the second paragraph
"Removal and disposal of path, removal and disposal of concrete headwall at outfall of existing
48-mch pipe at Cache La Poudre River,"
23 Concrete Headwall and Wingwalls at Double 10'x4' Culvert
Add the following to the second sentence in the second paragraph
"furnishing and installing trash rack"
Section 01580 — Project Signs
3 01 Requirements
B Delete the sentence
"The sign shall be paid for separately as indicated in the Bid Schedule "
Page 2 of Bid Addendum No 2
distributor Before application, the asphaltic oil shall be heated as directed by the
ENGINEER However, it shall not be heated to more than 180F In general, the
rate of application shall be from 0 25 to 0 35 gallons per square yard as directed
by the ENGINEER The prime coat shall be carefully applied, particularly
around curbs and sidewalks if excessive amounts of curb, sidewalks, or other
structures are sprayed with asphaltic oil, they shall be cleaned as directed by the
ENGINEER at the CONTRACTOR'S expense All vertical contact faces shall be
primed by painting with cationic emulsified asphaltic oil
303 ASPHALTIC CONCRETE SURFACE
A Transportation of Mixture The mixture shall be transported from the paving
plant to the work in vehicles equipped with tight metal compartments previously
cleaned of all foreign materials When directed by the ENGINEER, the
compartments shall be sufficiently insulated and each load shall be covered with
canvas or other suitable materials of sufficient size to protect it from weather
conditions The inside surface of all vehicle compartments used for hauling
mixture must be lightly lubricated with a tin oil or soap solution lust before
loading, but excess lubricant will not be permitted No load shall be sent out so
late in the day as to interfere with spreading and compacting the mixture during
daylight unless artificial light, satisfactory to the ENGINEER- is provided
B General Conditions The mixture shall be laid only when the base is dry and
only when weather conditions are suitable The mixture shall be laid only when
atmospheric temperatures are above 40F and rising and when no frost exists in
the subgrade Any material laid shall be rolled with pneumatic rollers in addition
to the specified rolling, as directed by the ENGINEER
C Placmg Asphalt Mixture If traffic is allowed to use the prepared subgrade or
sub -base, the subgrade or sub -base shall be checked and corrected as needed
immediately ahead of placing bituminous materials Prior to placement of the
bituminous surface, the base shall be cleaned of all dirt or other foreign matter
When the new pavement abuts the old pavement, the Contractor shall cut the old
pavement as directed by the Engineer and paint the edge of the pavement with a
tack coat
Howes Street Outfall 02740-9 Flexible Pavement
Phase I & II
4-05-99
CFI
Top Layer of
The Completed Pi
Min iPlace
Compacted Mix Temp
Under 1"
1 "-2 %2"
Over 2 '/2"
60OF
50OF
40OF
The asphaltic
conditions are
five percent
Hveem meth(
D 2726-83
While the
trim the o
Unless oth
means of a
to the line,
Pavers shall
type to place
be dumped u
and spilling i
mixtures at
decided by tl
Pavers shall
forward and
Unless c
such as
Layers Below the Top
Layer of Completed Pavement
Air Temp
Min
Placement Air Temp
Mix Temp
Compacted
Mix Temp
Mix Temp
200-234 F
fhickness
over 234 F
200-234 F
70OF
Under2"
40OF
50OF
550F
2-3"
30OF
40OF
450F
3 '/4-4"
250F
30OF
Over4"
20OF
20OF
pavement shall be placed only when the base is stable and weather
suitable The asphaltic pavement shall have a density of ninety-
95%) of a representative laboratory compacted specimen by the
d as tested in accordance with ASTM Method 2950-132 and ASTM
true lines with
spreading the
inches, to a m
minimum wid
devices for si
strips of course
e is being compacted and finished, the Contractor shall carefully
edges of the pavement to the proper alignment
permitted by the ENGINEER, the mixture shall be spread by
mcal self -powered paver, capable of spreading the mixture true
and crown set by the ENGINEER
e equipped with hoppers and distributing screws of the reversing
he mixture evenly in front of adjustable screeds The mixture shall
the center of the hoppers and care exercised to avoid overloading
,er of the mixture upon the base Pavers shall operate when laying
ich speed between 10 feet and 20 feet per minute, as may be
ENGINEER
equipped with a quick and efficient steering device and shall have
�erse speeds of not less than 100 feet per minute
on fixed side forms, pavers shall employ mechanical devices
zing runners, straightedge runners, evener arms, or other
,vices to adjust the grade and confine the edges of the mixture to
the use of stationary side forms The pavers shall be capable of
ixtures, without segregation, in thickness of from '/2 inch to 3
amum width of 10 feet in increments of 1 foot or less and to a
of 8 feet They shall be equipped with blending or joint leveling
,othing and adjusting all longitudinal joints between adjacent
of the same thickness
Howes Street Outfall 02740-10 Flexible Pavement
Phase I & 11
4-05-99
When asphalt concrete pavement thickness in excess of 2 inches is called for,
they shall be laid in separate courses of not less than 1 inch or more than 2 inches
of as directed by the Engineer
The term "screed" includes a "strike -off' device operating by cutting, crawling,
or other practical action which is effective on the mixture at a workable
temperature without tearing, shoving, or gouging and which produces a finished
surface of the evenness and texture specified The screed shall be adjustable as
to level and shall have an inducting level attached Longitudinal and transverse
joints shall be made in a careful manner Well bonded and sealed joints are
required It necessary to obtain this result, joints shall be painted with cationic
emulsified asphaltic cement
In making the joint along any adjoining edges such as curb, gutter, or an
adjoining pavement and after the hot mixture is placed by the finished machine,
just enough of the hot material shall be carried back to fill any space left open
This joint shall be properly "set" up with the back of rake at proper height and
level to receive the maximum compression under rolling The work of "setting
up" this joint shall be performed always by competent workmen who are capable
of making correct, clean, and neat joints
Immediately after any course is screeded, and before roller compaction is started,
the surface shall be checked, any inequalities adjusted, all fat, sandy
accumulations from the screed removed by a rake or hoe, and all fat spots in any
course removed and replaced with satisfactory material Irregularities in
alignment and grade along the outside edge shall also be corrected by the
addition or removal of mixture before the edge is rolled
In narrow, deep, or irregular sections, inteisections, turnouts, or driveways where
it is impractical to spread and finish the inixtuies by machine methods, the
CONTRACTOR may used approved spreading equipment or acceptable hand
methods as directed by the ENGINEER
When the mixtuie is to be spread by hand, upon anival on the work it shall be
dumped upon a steel dump board outside the area on which it is to be spread
Immediately thereafter it shall be distributed into place by means of hot shovels
and spread with hot lakes in a loose layer of uniform density and correct depth
Trines of the rakes shall not be less than '/z inch longer than the loose depth of the
mixture, and spaces between tines shall not be less than the maximum diameter
of aggregate particle except that in no case should the spaces be less than 1 inch
Loads shall not be dumped any faster than can be properly handled by the
shovelers
The shovelers shall not distribute the dumped load faster than it can be properly
handled by the rakers
The rakers will not be permitted to stand in the hot mixture while raking it,
except where necessary to correct errors in the first raking The raking must be
carefully and skillfully done in such a manner that after the first passage of the
roller over the raked mixture, a minimum amount of back patching will be
required
Howes Street Outtall 02740-11 Flexible Pavement
Phase 1 & 11
4-05-99 1
D
E
I®
Placing mixtures shall be as continuous as possible and the roller shall pass over
the unprotected edge of the freshly laid mixture only when the laying of this
course is to be discontinued for such intervals of tune as to permit the mixture to
become
Joints for
work, shall
continuous b
laid course s
which the hi
proper depth
a manner as
insure a mroi
between old and new pavements, or between successive days'
carefully made in such a manner as to insure a thorough and
id between the old and new surfaces The edge of the previously
11 be cut back to its full depth so as to expose a fresh surface, after
surface mixture shall be placed in contact with it and raked to a
id grade Hot smoothers or tampers shall be carefully used in such
3 heat up the old pavement sufficiently (without burning n) to
bond Before placing mixture against them, all contact surfaces
of curbs, gutters, headers, manholes, etc , shall be painted with a thin uniform
coating of cationic emulsified asphaltic cement
Compaction of the Mixture After spreading, the mixture shall be thoroughly and
uniformly compressed by a power -driven roller or rollers, weighting not less than
8 tons, as soon after being spread as it will bear the rollei without undue
displacement) Delays in rolling freshly spread mixture will not be tolerated
Rolling shall start longitudinally at the sides and shall proceed toward the center
of the pavement overlapping on successive trips by at least '/2 the width of a rear
wheel Alternate trips of the iollci shall be of slightly different lengths if the
width of the pavement permits, it shall, in addition, be rolled at right angles to the
center line
The speed of the roller shall not exceed 3 miles per houi and shall, at all times, be
slow enough to avoid displacements of the hot mixture, and any displacement
occurring as a result of reversing the direction of the roller, or from any other
cause, shall at once be corrected by the use of rakes and of fresh mixture where
required Rolling shall proceed continuously until all roller masks aie eliminated
and no further compression is possible To prevent adhesion of the mixture to
the roller, thel wheels shall be kept properly moistened, but excess water or oil
will not be permitted
The rollers shall be in good condition, capable of reversing without back -lash and
shall weight not less than 200 pounds to the inch of tread They shall be operated
by competent and experienced rollermen and must be kept in continuous
operation as nearly as practicable in such a manner that all parts of the pavements
shall receive substantially equal compression
Along curbs, headers, manholes and similar structuies and all places not
accessible to the roller, thorough compactions must be secured by means of hot
tampers and at all contacts of this character, the joints between these structures
and the surface mixture must be effectrvcly scaled
The course,
it shall be
average in
final compaction, shall conform to the following requirements
and true to the established crown and grade It shall have the
specified and shall at no point vary more than ''A inch from the
Howes Street Outfall 02740-12 Flexible Pavement
Phase I & 11
4-05-99
n
3 04 TO
In t
reap
asp!
and
A
B
C
3 05 MA
A
B
C
Howes Street
Phase I & II
4-05-99
thickness shown on the typical cross-section in the Plans Any low or defective
places shall immediately be remedied by cutting out the course at such spots and
replacing it with fresh, hot mixture which shall be immediately compacted to
conform with the surrounding area and shall be free from depressions exceeding
'/4-inch as measured with a 10-foot straightedge paralleling the centerline of the
roadway
After final compaction, the finished surface course shall at no point have a
density less than 90% of the maximum density possible to be obtained in a
voidless pavement composed of the same materials in like proportions Density
shall be determined from specimens cut from the finished pavement as directed
by the ENGINEER
Y ASPHALT COLD -PATCH
event the CONTRACTOR cannot install hot bituminous pavement, for whatever
i, pursuant to the requirements of these documents, he shall install a temporary
t cold -patch pursuant to said requirement and subsequently remove said cold -patch
place with hot bituminous pavement at the earliest possible date
Place suitably prepared base course
Minimum thickness 2 inches on 6-1/2 inches of aggregate base course
The CONTRACTOR is responsible for maintaining cold -patch
FRAMES AND VALVE BOXES
Manhole frames and water valve vaults can be completed after paving operation
by using "plates "
Foreign matter which is introduced into manholes and valve vaults shall be
removed immediately to provide free access to the facilities
Valve vaults and manhole rings shall be straight and properly aligned
Adjustments to be made with concrete rings and mortar only (maximum
tolerance is '/4")
Valve boxes shall be inspected by placing a valve key on the operating nut to
assure a proper alignment
END OF SECTION
02740-13 Flexible Pavement
THIS I
'AGE INTENTIONALLY LEFT BLANK.
Howes Street Outfall 02740-14 Flexible Pavement
Phase I & II
4-05-99
SECTION 02770
'ALK, CURB AND GUTTER, AND MISCELLANEOUS CONCRETE
PART 1
101 SECTION INCLUDES
A Concrete work shall consist of air entrained Portland Cement concrete constructed
on a prepared subgrade in accordance with these Specifications The completed
work shall conform to the thicknesses and typical cross -sections shown on the
Drawings The completed work shall conform to the lines and grades shown on the
Drawings or to those established by the ENGINEER at the job site
1 02 RELATED SECTIONS
A Section 02240 — Water Control and Dewatenng
B Section 02315 — Excavation and Embankment
C Section 02320 — Trench Excavation and Backfill
103 SUBMITTALS
A The CONTRACTOR shall cooperate with the ENGINEER in obtaining and
providing samples of all specified materials The CONTRACTOR shall submit
certified laboratory test certificates for all items required in this section, including
a mix design for concrete
1 04 PROJECT REQUIREMENTS
The CONTRACTOR shall submit batch tickets for each load of concrete Tickets shall
show weight of all materials and additives used in each batch
PART 2
201
A
Concrete shall conform to the following requirements
28-Day Field Compressive Strength 3500 psi
Cement/Fly Ash 600 lbs /cu yd
Max Water/Cement Ratio 053
Air Content % Range 5-8
Maximum Slump 4"
Fine Aggregate (max % of total Aggregate) 50%
This material shall consist of a mixture of coarse and fine aggregates, Portland
cement, water and other materials or admixtures as required The type of cement
shall be Type I, 11, or I II unless sulfate conditions dictate otherwise If sulfate
conditions exist, Type V cement shall be used
Howes Street
Outfall 02770-1 Sidewalk, Curb and Gutter,
Phase I
and Miscellaneous Concrete
4-05-99
B Concrete
The grading land composition requirements for coarse and fine aggregates for
concrete shall conform to the following tables
AGGREGATES FOR PORTLAND CEMENT CONCRETE
Size or % Passing or
'rocedure Test Requirement
I Inch
100
'/o Inch
90-100
'/8 Inch
20-55
No I
0-10
No 8
0-5
% Wear
45, Max
Clay Lumps * Friable Particles, %
2 0, Max
Coal & Lignites, %
0 5, Max
Sodium Sulfate Soundness %
12, Max
AGGREGATES FOR PORTLAND CEMENT CONCRETE
Size or Percent Passing or
rocedure Test Requirement
'/e Inch
100
No 4
95 - 100
No 16
45-80
No 50
10-30
No 100
2 - 10
No 200
3, Max
Fnable Particles, %
10, Max
Coal & Lignite, %,
10, Max
Deleterious Material (AASHTO T 112)%
3, Max
Sand Equivalent (AASHTO T 176)%
80, Min
Fineness Modules
2 50 - 3 50
Sodium Sulfate Soundness, %
20 0, Max
C Coarse Aggregate for Concrete
Coarse aggregates shall conform to the requirements of AASHTO M 80, except that
the percentage of wear shall not exceed 45 when tested in accordance with
AASHTO T 96 Coarse aggregate shall conform to the grading in above table
D Fine Aggregate for Concrete
Fine aggregates shall meet Colorado Department of Highways Section 703 01
requirements and gradation as shown above Fine aggregate for concrete shall
conform to the requirements of AASHTO M 6 The amount of deleterious
Howes Street Outfall 02770-2 Sidewalk, Curb and Gutter,
Phase I and Miscellaneous Concrete
4-05-99
substances removable by elutnation shall not exceed 3% by dry weight of fine
aggregate when tested in accordance with AASHTO T 11, unless otherwise
specified The minimum Sand Equivalent, as tested in accordance with AASHTO T
176 shall be 80, unless otherwise specified The Fineness Modules shall not be less
than 2 50 nor greater than 3 50, unless otherwise approved
E I Fly Ash and Water
Upon approval based on a satisfactory trail mix, the CONTRACTOR shall have the
option of substituting approved fly ash for portland cement, up to a maximum of 20
percent by weight The total weight of cement and fly ash shall not be less than the
specified mix design
Fly ash for concrete shall conform to the requirements of ASTM C 618,
Class C or Class P All chemical requirements of ASTM C 618 Table 1-A
shall apply with the exception of footnote A
Class C fly ash will not be permitted where sulfate resistant cement is
required
The CONTRACTOR shall submit certified laboratory test results for the fly
ash Test results that do not meet the physical and chemical requirements
may result in the suspension of the use of fly ash until the corrections
necessary have been taken to insure that the material meets the
specifications
Water used in mixing or curing shall be clean and free of oil, salt, acid,
alkali, sugar, vegetable, of other substance injurious to the finished
product Water will be tested in accordance with, and shall meet the
suggested requirements of AASHTO T 26 Water known to be of potable
quality may be used without test Where the source of water is relatively
shallow, the intake shall be so enclosed as to exclude silt, mud, grass, or
other foreign materials
F � Concrete Curing Materials and Admixtures
Curing Materials Curing Materials shall conform to the following
requirements as specified
Burlap Cloth made from Jute or Kenaf AASHTO M 182
Liquid Membrane -Forming Compounds Curing Concrete AASHTO M
Sheet Materials for Curing Concrete AASHTO M 171
Straw shall not be used for curing unless approved by the ENGINEER
Air -Entraining Admixture Air -entraining admixtures shall conform to the
requirements of AASHTO M 154 Admixtures which have been frozen
will be rejected No chloride containing additives shall be permitted
Howes Street Outfall 02770-3 Sidewalk, Curb and Gutter,
Phase I and Miscellaneous Concrete
4-05-99
3 Che
the
will
4 Joir
the
PART EXECUTION
301 SUBGRADE
;al Admixtures Chemical admixtures for concrete shall conform to
airements of AASHTO M 194 Admixtures which have been frozen
rejected
The joint fillers shall meet the requirements of one or more of
listed in paragraph 1 03
TION
A The subgrade� shall be excavated or filled to the required grades and lines All soft,
yielding, or otherwise unsuitable material shall be removed and replaced with
suitable material with the ENGINEER's approval Filled sections shall be
compacted and compaction shall extend a minimum of six inches outside the form
lines
The moisture content of the subgrade shall be brought within +/- 2% of optimum
moisture content and compacted to 95% of the maximum standard Proctor density
(ASTM D698) for subgrade materials classified as A-4 through A-7 or 95% of
modified proctor density for materials classified as A-1 through A-3
302 CONCRETE
A Concrete transported in truck mixers or truck agitators shall be delivered to the site
of the work and completely discharged within a period of ninety (90) minutes after
the cement comes in contact with the mixing water or with the combined aggregates
containing free moisture in excess of 2% by weight The concrete shall be placed
either by an approved slip form/extrusion machine, by the formed method, or by a
combination of these methods The subgrade shall be conditioned to provide a
uniforinly moist surface when concrete is placed
303 MACHINE
A The slip for extrusion machine shall be so designed to place, spread, consolidate,
screed, and finish the concrete in one complete pass in such a manner that a
minimum of hand finishing wdl be necessary to provide a dense and homogenous
concrete section The machine shall shape, vibrate, and/or extrude the concrete for
the full width Iand depth of the concrete section being placed It shall be operated
with as nearly a continuous forward movement as possible All operations of
mixing, delivery, and spreading concrete shall be so coordinated as to provide
uniform progress, with stopping and starting of the machine held to a minimum
3 04 FORMED METHOD
A The vertical face of previously sawed and adjacent asphalt pavement may NOT be
used as a forming surface The CONTRACTOR shall use forms on front and back
of all curb and, gutter, sidewalks and crosspans
The forms shall be of metal or other suitable material that is straight and free from
warp, having sufficient strength to resist the pressure of the concrete without
Howes Street Outfall 02770-4 Sidewalk, Curb and Gutter,
Phase I and Miscellaneous Concrete
4-05-99
C. DIVISION II - SITE WORK
REVISIONS
Section 02315 — Excavation and Embankment
3 02 Excavation and Backfill for Structures
Add the following paragraph
"Prior to placement of fill over undisturbed on -site soils, the on -site soils shall be scarified to a
minimum depth of 8 inches, conditioned to near optimum moisture content (+/- 2%) and
compacted to 95% of the Maximum Standard Proctor Density "
Section 02375 — Riprap, Bedding, and Feature Boulders
201 Materials
A. RipRap
In riprap designation table, for Type VH riprap, revise "41" inches to be "42" inches
C Feature Boulders
Replace the first sentence with the following sentences
"Feature Boulders shall meet the same material requirements as riprap unless designated
otherwise on the Drawings The shape of the boulders shall be as designated on the
drawings "
Section 02740 — Flexible Pavement
"Delete entire section and replace with the attached section "
Section 02770 — Sidewalk, Curb and Gutter and Miscellaneous Concrete
"Delete entire section and replace with the attached section "
Page 3 of Bid Addendum No 2
displacement and sufficient tightness to prevent the leakage of mortar Flexible or
rigid forms of proper curvature may be used for curves having a radius of 100 feet
or less Division plates shall be metal Where directed by the ENGINEER the
CONTRACTOR shall use a thin metal back form to preserve landscaping,
sprinklers, etc Form must be straight and rigid and must be approved by the
ENGINEER prior to use on project
The front and back forms shall extend for the full depth of the concrete All of the
forms shall be braced and staked so that they remain in both horizontal and vertical
alignment until their removal No wooden stakes will be allowed They shall be
cleaned and coated with an approved form -release agent before concrete is placed
against them The concrete shall be deposited into the forms without segregation
and then it shall be tamped and spaded or mechanically vibrated for thorough
consolidation Low roll or mountable curbs may be formed without the use of a
face form by using a straight edge and template to form the curb face When used,
face forms shall be removed as soon as possible to permit finishing Front and back
forms shall be removed without damage to the concrete after it has set
Should the removal of adjacent asphalt pavement be required beyond that shown in
the asphalt patch detail to properly correct failed concrete sections, the
CONTRACTOR shall remove and replace said asphalt pavement to such an extent
as to provide a smooth repair The ENGINEER shall be notified prior to
commencing any additional asphalt removal
305
A The plastic concrete shall be finished smooth by means of a wood float and then it shall be
givenlfinal surface texture using a light broom or burlap drag Concrete that is adjacent to
forms and formed joints shall be edged with a suitable edging tool to the dimensions shown
on the Drawings
306
A Contraction Joints Transverse weakened -plane contraction joints shall be
constructed at right angles to the curb line at intervals not exceeding 10 feet for
curb and gutter or 5 feet for sidewalk ioint depth shall average at least one-fourth
of the cross-section of the concrete
Contraction Joints may be sawed, hand -formed, or made by 1/8 inch thick division
plates in the form work Sawing shall be done early after the concrete has set to
prevent the formation of uncontrolled cracking The joints may be hand -formed
either by (1) using a narrow or triangular jointing tool or a thin metal blade to
impress a plane of weakness into the plastic concrete, or (2) inserting 1/8 inch thick
steel strips into the plastic concrete temporarily Steel strips shall be withdrawn
before final finishing of the concrete Where division plates are used to make
contraction Joints, the plates shall be removed after the concrete has set and while
the forms are still in place
B Expansion Joints Expansion Joints shall be constructed at right angles to the curb
line at immovable structures and at points of curvature for short radius curves
Filler material for expansion joints shall conform to requirements of one or more of
Howes Street Outfall 02770-5 Sidewalk, Curb and Gutter,
Phase I and Miscellaneous Concrete
4-05-99
the references defined in Section 103 and shall be famished in a single 1/2 inch
thick piece for the full depth and width of the joint
Expansion joints in a slip formed curb or curb -and -gutter shall be constructed with
an appropriate hand tool by raking or sawing through partially set concrete for the
full depth and width of the section The cut shall be only wide enough to permit a
snug fit for the joint filler After the filler is placed, open areas adjacent to the filler
shall be filled with concrete and then troweled and edged The CONTRACTOR
may choose to place the filler and pour the concrete around it
Alternately, an expansion joint may be installed by removing a short section of
freshly extruded curb -and -gutter immediately, installing temporary holding forms,
placing the expansion joint filler, and replacing and reconsolidating the concrete that
was removed I Contaminated concrete shall be discarded
Construction joints maybe either butt or expansion -type joints Curbs or combined
curbs and gutters constructed adjacent to existing concrete shall have the same type
of joints as inIIthe existing concrete, with similar spacing, however, contraction joint
spacing shall not exceed 10 feet
3 07 PROTECTION
A The CONTRACTOR shall always have materials available to protect the surface of
the plastic concrete against ram These materials shall consist of waterproof paper
or plastic sheeting For slip form construction, materials such as wood planks or
forms to protect the edges shall also be required Concrete damaged by ram shall be
required to be;removed and replaced at the CONTRACTOR's expense
Concrete being placed in cold weather during which the temperature may be
expected to drop below 35 degiees F , shall be suitably protected to keep the
concrete from freezing until it is at least 10 days old Concrete injured by frost
action shall be required to be removed and replaced at the CONTRACTOR's
expense
The CON
defacement
308 CURING
A Concrete
moisture,
white liquid
curing mate
when the a
completion e
3 09 BACKFILLING
R will be responsible for correcting any vandalism or
that occurs on the concrete prior to final acceptance
be cured for at least 7 days after placement to protect against loss of
I temperature change, and mechanical injury prior to any overlay or
work Moist burlap, waterproof paper, white polyethylene sheeting,
iembrane compound, or a combination thereof may be used as the
1 Membrane curing shall not be permuted in frost -affected areas
-rete will be exposed to deicing chemicals within 30 days after
he curing period
Howes Street Outfall 02770-6 Sidewalk, Curb and Gutter,
Phase I and Miscellaneous Concrete
4-05-99
rf-Y-I
3 10
3 11
A The spaces in front and back of curbs shall be refilled with suitable material to the
required elevations after the concrete has set sufficiently The fill material shall be
thoroughly tamped in layers
A Where required, concrete shall be sealed with a mixture of 1/2 linseed oil and 1/2
diesel fuel, unless otherwise specified by ENGINEER
A Forms shall not deviate from true ]me by more than '/a -inch at any point
B Mixed concrete shall be not less than 50 F, nor more than 80°F at the time of
placing it in forms unless otherwise directed
C If air temperature is 35°F or less at the time of placing, the ENGINEER will require
water and/or aggregate heated to not less than 70F, or more than 150F
D Finished joints shall not deviate more than '/a -inch in the horizontal alignment from
a straight line
E Any localized humps and or depressions greater than '/a -inch will require removal
and replacement of the work in question
F No ponding of water greater than 3/8-inch shall be allowed
G Combination curb, gutter and walk and/or vertical curb and gutter flowhne depth
shall not vary from adopted standards by more than +1/2-inch, measured vertically
from the top of curb to the gutter invert
H Pedestrian walks shall have a minimum of 2 0% and a maximum of 2 5% slope
toward the roadway
I Contraction and construction joints shall be placed at the standard spacing of 10 feet
in curb, gutter, sidewalks, crosspans, trickle channel, etc A minimum spacing of 5
feet will be allowed for repairs
I Heave or settlement of sidewalk, relative to separate curb pour, greater than %2-mch
shall be cause for corrective action This provision shall not apply to transverse
vdewalk joints
K At the time of final acceptance inspection, the repair of all cracks will be completed
1 Cracks that are less than '/<-inch wide, exhibit no horizontal or vertical
shifting, and do not meet the conditions in 2, 3, and 4 below may, at the
Howes Street
Phase I
4-05-99
02770-7
Sidewalk, Curb and Gutter,
and Miscellaneous Concrete
1-
LIJ
discretion of the OWNER, be sealed by routing approximately'/<-mch to 1-
inch deep by '/a -inch wide and filling with Sikallex 1-A or equivalent
2 Any (crack that extends through a joint shall require removal and
replacement of the entire cracked area
3 Any longitudinal cracked section of concrete will require complete removal
and replacement of that section between joints
4 Repair action for hairline cracks as determined in 1 above may be waived at
the discretion of the OWNER For the purpose of this section, a hairline
crackI is one that is reasonably immeasurable and without separation as
determined by the ENGINEER
3 12 QUALITY CONTROL
A Concrete testing and testing laboratory services required shall conform to the following
unless otherwise determined by the ENGINEER
Section Type of Test
GRADATION
SIDEWALKS
(CONCRETE)
CURBING
(CONCRETE)
MOISTURE
CONTENT
(FINE AGG
MOISTURE
CONTENT
(COARSE
AGGREGATE)
SLUMP
AIR CONTENT
Project Acceptance
Frequency
Sidewalks 1/1000 sq yds
or fraction thereof for
each size aggregate of
concrete placed
Corbinn 1/2000 lineal feet or
fraction thereof for each
size aggregate of concrete
placed
1 per day and as often
as needed for quality
control
Procedures
Test Project
Sampling Testing
CP 30
CP 30
1 per day min where CP 30
moisture content is greater
than +0 5% from SSD condition
The slump, air content and
unit weight tests shall be
carried out on the first
truck of concrete for the
daily placement and there-
after in conformance with
the following table
1 set of tests for every
T 141
T 141
CP 31
CP 60
CP 60
T 119
T 152
Howes Street Outfall 02770-8 Sidewalk, Curb and Gutter,
Phase I and Miscellaneous Concrete
4-05-99
I
3 13
Prior
of co
0
1000 square yards or fi-action T 199
thereof of concrete placed
AND 4 tests for every 2000 T 141 T 121
1T lineal feet or fraction thereof
or nomograph of curb and
gutter graph placed
COMPRESSIVE Sidewalks 1 set (4) of T 141 T 22
cylinders per 1000 square yards T 23
or fraction thereof or
concrete placed per day
Curbing 1 set (4) of
cylinders per 2000 lineal
feet or fraction thereof
of concrete placed per day
Point of Acceptance Gradation - Stockpile, belt, or bin
Air Content - Mixer Discharge
backfilling and after forms are removed, honeycombed, defective or damaged areas
-ete shall be repaired Repairs shall be made within 7 days after the forms are
fhe surface of the concrete shall be thoroughly cleaned upon completion of the work
and prior to the substantial completion walk through, and the site left in a neat and
orderly condition
END OF SECTION
Howes Street Outfall 02770-9 Sidewalk, Curb and Gutter,
Phase I and Miscellaneous Concrete
4-05-99
Howes Street Outfall
Phase I
4-05-99
THIS PAGE INTENTIONALLY LEFT BLANK.
02770-10 Sidewalk, Curb and Gutter,
and Miscellaneous Concrete
ATTENDANCE RECORD
PREBID CONFERENCE
Project- Howes Street Outfall-Phase 1 & 11
Time:9.00 a.m
Date: _ April 29, 1999 _
Location: 700 Wood Street
NAME
FIRM NAME
ADDRESS
TELEPHONE
FAX #
E-MAIL ADDRESS
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ATTENDANCE RECORD
PREBID CONFERENCE
Project. Howes Street Outtall-Phase i & II
Time: 9.00 a m.
Date: April 23, 1999
Location 700 Wood Street
NAME
FIRM NAME
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D. DRAWING REVISIONS
Sheet C-1 General notes for Howes Street Outfall - Phase I and 11
Add the following note
10 The Contractor shall avoid driving construction vehicles over existing paths for
construction of the improvements The Contractor shall be responsible for
replacing path's damaged by his construction activities at his expense
Page 4 of Bid Addendum No 2
LJe'I" 'hn.0
E. LIST OF ATTENDEES TO
PRE -BID CONFERENCE
"See attached list"
F. GEOTECHNICAL REPORT
"See attached report"
G. LIST OF PLAN HOLDERS
"See attached list"
Page 5 n/ Bid Addendum No 2
1
PRE -BID CONFERENCE SYNOPSIS
AND
MEETING AGENDA
The following items were discussed and clarified at the Pre -bid Conference but are not a part of this bid
addendum The Pre -bid Synopsis and Meeting Agenda is provided for informational purposes only
1 ICON Engineering, Inc is the Civil Designer for the project, Bates Engineering, Inc , completed
Structural Design, and Jim Sell Design completed Landscaping and Irrigation Design All questions
concerning the design shall be directed to Doug Williams at ICON 303-221-0802 Questions
regarding the bidding requirement shall be directed to Ms Opal Dick with the City's Purchasing
Department
2 Plans may be picked up at the City's Purchasing Department and arc also available for viewing at
the Plans Room
3 Bid opening has been changed to May 13, 1999, at 2 00 p in
4 Coordination is very important for project There are several time constraints that will have to be
met Contractor will have to schedule his work with others in the project area
5 Contractor shall coordinate with
a Public Service for removal of 8-inch high pressure gas line in Cherry Street
b City Water Department for relocation of 6-mch waterline in Cherry Street
6 Work in BNRR must be completed in 28 calendar days Work limits are from Station 5+58 to
Station 6+10 Contractor shall be aware of insurance requirements for work in railroad right-of-
way
7 BNSF will remove and replace ballast and tracks at no cost to the contractor Any BNSF flag
persons required will be supplied at no cost to the contractor
8 A portion of the duct bank is in the work required for the BNSF Railroad crossing and a portion is
outside of it Refer to the stations shown for the work items in the spew fications
9 Contractor shall notify City Light and Power 20 days in advance of work in electric duct bank
Electric duct bank shall be excavated and supported by the contractor The City will remove
concrete around and under the duct bank to approximately 24 Inches wide x 30 inches in depth
The duct bank consists approximately of
5 - 5" PVC Conduits
2 — 4" PVC Conduits
2 —2" PVC Conduits
Page I of Pre -bid Confeieme Synopme
f t.1
In the conduits are
6 — 750 kcm aluminum cables — 15 kv, 220 mil insulation, jacketed weight 1 77 pounds/foot/cable
3 — 1/0 aluminum cables — 14 kv, 220 inil insulation, jacketed weight 69 pounds/foot/cable
1 — 350 kern aluminum tripex cable — 600 volt, weight 1 19 pounds/foot
2 — 144 fiber, fiber optic cables, weight 0 15 pounds/foot/cable
10 Supports for electric duct bank must be designed by a P E licensed in Colorado Submittals will be
made for approval
11 City Light and Power is planning on adding a new electric duct in the alignment of the box culvert
at the BNSF Railroad and south through Cherry Street Contractor shall coordinate with City during
installation Contractor may have to backfill this line during his backfill operation for construction
of the culvert
12 The 45-day time period for work in Cherry Street covers the time the street can be closed Work
outside this area can be completed at different times, as long as it does not interfere with the street or
traffic
13 Existing asphalt thickness in Cherry Street is estimated to be 8 inches based on Test Hole No 6
14 The limits of construction south of Cherry Street are approximately 100 feet east to west and 50 feet
north to south
15 Coordinate with the City Park Department for irrigation construction
16 Concrete mix designs are minimum requirements Contractor may submit designs that exceed the
minimum requirements to aid in his construction techniques and sequencing
17 Contractor shall bid the culvert based on the design presented If contractor wishes to change the
method of construction, this will be reviewed after bid is awarded Additionally, construction costs
for changes would be the Contractor's responsibility
18, Angle points in box culvert will not be allowed Culvert must be curved as shown on plans
19 Box culvert installation includes over -excavation of subgrade and replacement with 18 inches of
suitable on -site material and 6 inches of rock bedding Replacement of suitable on -site material
with rock at the Contractor's option would be at the Contractor's expense This would have to be
accepted by the City
20 The subgrade of box culvert shall be scarified to a depth of 8 inches and re -compacted to 95% of the
Maximum Standard Proctor density at 2%+/- optunuin moisture content This requirement will be
added to the Addendum
21 Boulders to be used for the drop structure and feature boulders shall be rounded river rock These
may be available in the Fort Collins area from Pioneer Sand and Hall/Erwin
22 Placement of boulders shall be random lun Sell Design will be on -site to help contractor with
placement
23 A casing pipe has been installed on the North Weld County waterline Contractor shall be aware
that the culvert will be very close to this line
Page 2 of Mc -bid Confeiew e ,S) nopv
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24 A geotechnical report was completed for the project This is on file with the City and will be
included in the Addendum
25 Earthwork quantities do not include excavation or fill for structures (ie, culvert, riprap, drop
structure, etc ) Quantities do include excavation required for the Cherry Street lowering
26 Quantities shall be bid according to the Bid Schedule Final earthwork quantities will be calculated
based on the existing and final grades measured for the project
27 The City does not need excess material Contractors shall assume disposal of material off -site at
their own location and expense
28 Based on the geotechnical report, there should be enough suitable on -site material for backfill If
this is not the case, then negotiations may be held with the Contractor for providing import material
29 Plans for Erosion Control and Traffic Control must be submitted by the contractor for approval and
can be adjusted to facilitate his work Plans shown in the Drawings have been reviewed by the City
and should be used as a guide
30 The staging area east of Martinez Park will be available for use by the contractor Construction
trailers shall be placed in this area Provisions shall be made for safe passage of pedestrians along
the path in this area Fencmg will be required and will be added to the Addendum
31 To the City's knowledge, no hazardous materials have been encountered in this area based on
previous work
32 Removal of the path should be included in Bid Item 6 — Removal of Structures and Obstructions
33 The path will have colored concrete and fiber mesh per the Drawings Sidewalks and driveways
will not
34 The City will work with contractor to minimize grading and disturbance in slew area
Page 3 olPre-bed Coifeiuiee Synopsis