HomeMy WebLinkAbout05/01/2012 Study Session Agenda PacketNIARA A
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MARANA TOWN COUNCIL
STUDY SESSION
NOTICE AND AGENDA
11555 W. Civic Center Drive, Marana, Arizona 85653
Council Chambers, May 1, 2012, at or after 6:00 PM
Ed Honea, Mayor
Patti Comerford, Vice Mayor
David Bowen, Council Member
Herb Kai, Council Member
Carol McGorray, Council Member
Jon Post, Council Member
Roxanne Ziegler, Council Member
ACTION MAY BE TAKEN BY THE COUNCIL ON ANY ITEM LISTED ON THIS AGENDA.
Revisions to the agenda can occur up to 24 hours prior to the meeting. Revised agenda items appear in
italics. The Council Chambers are wheelchair and handicapped accessible. Any person who, by reason
of any disability, is in need of special services as a result of their disability, such as assistive listening
devices, agenda materials printed in Braille or large print, a signer for the hearing impaired, etc., will
be accommodated. Such special services are available upon prior request to the Town Clerk at least 10
working days prior to the Council meeting.
CALL TO ORDER AND ROLL CALL
PLEDGE OF ALLEGIANCE/INVOCATION/MOMENT OF SILENCE
APPROVAL OF AGENDA
DISCUSSION/DIRECTION/POSSIBLE ACTION
D 1: Presentation: Relating to Budget; review, consideration and direction to staff
regarding the preliminary FY2013 budgets for the Enterprise Funds, other selected
funds, the proposed Capital Improvement Plan and the Pavement Preservation
Program (Gilbert Davidson and Erik Montague)
Executive Session pursuant to A.R.S. §38- 431.03 (A)(3), Council may ask for discussion or
consultation for legal advice with the Town Attorney concerning any matter listed on this agenda.
ADJOURNMENT
Study Session - May 1, 2012 - Page 1 of 3
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MARANA
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11555 W. CIVIC CENTER DRIVE, MARANA, ARIZONA 85653
Council Chambers, May 1, 2012, 6:00 PM
To: Mayor and Council
From: Gilbert Davidson and Erik Montague, Town Manager and Finance Director
Strategic Plan Focus Area:
Commerce, Community, Heritage, Progress and Innovation, Recreation
Item D 1
Subject: Presentation: Relating to Budget; review, consideration and direction to staff
regarding the preliminary FY2013 budgets for the Enterprise Funds, other selected
funds, the proposed Capital Improvement Plan and the Pavement Preservation Program
Discussion:
The May 1 st Study Session will provide an overview of the preliminary budgets for the
Enterprise Funds and other selected funds. The April 17th Study Session focused on the General
Fund.
Staff will also present an overview of the projects recommended for inclusion in the FY2013
budget as part of the Capital Improvement Program. Initial capital project costs are funded out of
one -time revenue sources. Ongoing costs associated with the maintenance and /or operation of
new capital projects are included in the appropriate operating budget in the year the capital
improvement is placed in service.
The ongoing maintenance costs for our transportation system have been quantified in a Pavement
Preservation Program. Road systems require a series of periodic minor and moderate treatments
for the assets to last their full estimated life. A considerable effort has been made by the Public
Works department over the past year to inventory and establish the condition of the Town's road
system. The presentation will provide an overview of key parts of this program as well as
strategies on managing pavement and related costs.
Staff will provide copies of the presentation prior to the meeting.
Financial Impact:
The recommended budget incorporates the overall strategies outlined in the January 24, 2012
study session.
ATTACHMENTS:
Name: Description: Type:
No Attachments Available
Staff Recommendation:
Study Session - May 1, 2012 - Page 2 of 3
Staff requests information and direction regarding the preliminary budgets for fiscal year 2012-
2013 which will be incorporated into the tentative budget.
Suggested Motion:
Presentation and discussion only.
Study Session - May 1, 2012 - Page 3 of 3
PAVEMENT PRESERVATION PROGRAM
TABLE OF CONTENTS
Foreword................................................................................... ..............................1
Introduction.............................................................................. ............................... 2
Methods& Treatments ........................................................... ............................... 5
Treatment Descriptions ........................................................... ..............................8
Conceptual Treatment Schedule ........................................ .............................15
Street Inventory List by Category ......................................... .............................16
ATTACHMENTS
Committee Recommendations ............................................ .............................49
6 Year Pavement Preservation Recommended ................ .............................51
What is Asphalt Pavement? Why and how should it be preserved?
Asphalt pavement is made of Asphaltic Concrete (AC), which is a thin layer of
flexible pavement composed of sand and gravel mixed with approximately 6%
asphalt oil to bind the rock products together. Standard industry pavement
design criteria are based on the anticipated traffic loads during a twenty year
lifespan in that location, built over the existing site soils. Some advantages of
using AC versus a common rigid pavement, like Portland Cement Concrete
(PCC), on roads are the cost and speed of construction. A smaller volume of less
expensive surfacing materials can be used, and roads can be driven on within
hours of paving instead of weeks. Maintenance options are more varied in the
type of thin surface treatments available, including re- surfacing by thin milling
and re- paving, where concrete would require full depth removal and
replacement.
Some disadvantages are that over time, weather, sun, moisture, motor and fuel
oils attack the asphalt oils, which dry, shrink, and become brittle. If left
untreated, asphaltic concrete will eventually degrade back into just sand and
gravel, with some decaying carbon deposits in between which can no longer
bind them together. One significant disadvantage found to limit pavement
preservation options is that where anticipated loads are light, current design
standards allow only two inches of asphalt thickness. Almost all sub - division
roads are this thin and cannot be milled and re- surfaced since there is not enough
sound asphalt remaining after milling. AC overlay would increase pavement
thickness too much and is also not an option on these curbed roadways. This
leaves fog, slurry and chip type surface seals as the only viable preservation
options, besides complete removal and replacement in these conditions.
The best way to prevent ultimate deterioration is early application of surface
treatments while the roads are fairly new and in good condition, rather than after
they have already deteriorated. It is much less costly to establish a regular
evaluation and treatment regimen to maintain them in the best condition
possible, than to allow deterioration requiring more costly treatments or
replacement. Early application of pavement surface treatments seal the oil bonds
from- exposure to the elements, slows decay, and extends the useful service life of
the pavement structure. Based on studies done by the Federal Highway
'Administration (FHWA), this approach can reduce long term expenditures by a
factor of up to 4.
INTRODUCTION
The Town of Marana exemplifies a commitment to roadway infrastructure excellence,
as evidenced by the recent award winning projects and continued focus on quality
roadways. In order to maintain this level of distinction, the Public Works Department
has drafted a Pavement Preservation Program outlining the necessary steps to cost
effectively maintain aging infrastructure. The program is a planned maintenance
concept, centered on roadway pavement treatment at the optimal time to maximize
useful life, thus enhancing pavement longevity and reducing long -term life cycle costs.
Implementing this program will optimize maintenance efficiency, clarify budgetary
forecasts, and improve the overall infrastructure quality for years to come.
MISSION
Extend the Toum of Marana's pavement infrastructure's useful life by proactively treating
roadways with an individual scientific approach, designed to reduce overall life cycle costs,
benefiting Marana's motorists today and tomorrow.
COMMITTEE
The Pavement Preservation Committee is comprised of staff members from various
departments within the Town of Marana, who bring a wide range of knowledge and
expertise to the committee. The current committee roles and responsibilities are as
follows:
ROLE STAFF MEMBER
TITLE
Chairman Cookie Gallegos O &M Superintendent
Project Manager
Mac Murray
Construction Manager
Field Inspector
Greg Sendlak
Construction Inspector
Plan Reviewer
Paul Baughman
Civil Engineer
Field Inspector
Dan Whitehair
Concrete/ Asphalt Foreman
Data Analysis
Brendan O'Connor
Acceptance Inspector
Data Analysis
Dan Grossman
Acceptance Inspector
OBJECTIVE
The committee's objective is to assess roadways systematically, utilizing technology and
staff to its full potential. This committee is dedicated to delivering the most economical
treatment methods needed to restore and preserve the Town's infrastructure. The
committee will convene each fall, beginning in early August through September to
review, critique and assess current roadway conditions. The fall session's purpose is to
assemble and prioritize a six year list of pavement preservation and capital
improvement projects, as well as to coordinate the current fiscal year's budgeted
projects. At the conclusion of this session, the committee will draft a report containing
pavement preservation and capital improvement project recommendations; outlining a
scope and budget for the upcoming fiscal year's proposed projects.
Each spring the committee will reconvene to review the progress of the current fiscal
year's work, and to review alternative treatment methods. The committee will also
evaluate any modifications needed, and /or recommended by the Director of Public
Works, prior to the end of the current fiscal year. The committee will follow this
schedule annually as part of the Pavement Preservation Program.
PROGRAM
The Town of Marana's Pavement Preservation Program employs a new proactive
maintenance philosophy, focused on prevention of major rehabilitation or
reconstruction. The plan's objective is early surface treatment applications. Instead of
applying treatments as a corrective measure, the treatments will be applied while roads
are in fairly good condition. The Town of Marana uses a Computerized Maintenance
Management System (CMMS) to collect all public infrastructure data, which will then
be used to determine the best means to preserve and repair roadways. This integrated
preservation and preventative maintenance strategy, if applied long -term, will reduce
rehabilitation costs and increase infrastructure life.
Marana's strategy to combat road deterioration begins with the CMMS. By recording
factors including: age, observable pavement distresses, and the number, and length of
cracks; the computer software is able to assign each roadway an Overall Condition
Index (OCI). These indexes are gathered in a database, sorted, and prioritized. This
prioritization method results in a more efficient use of resources by allocating money
where it has the most impact. By tailoring treatment options to the existing surface
conditions, products can be chosen to target individual pavement's deficiencies and
give the Town the greatest cost to benefit ratio. The following are detailed examples
representing many of the surface treatments we have at our disposal. Illustrated below,
in table A, is a decision matrix, employed when determining the most appropriate
preventative maintenance treatment.
OCI
Treatment Type
Estimated
Cost per SY
Pavement
Life
Extension in
Years
Ride Quality
Improvement
100 -80
Crack Seal (CR)
$0.63
2
No Change
100 -80
Fo Seal (FS)
$0.70 - 0.85
3
No Change
100 -80
As halt Rejuvenators ARJ)
$1.50-2.00
3
No Change
100 -80
High Density Mineral Bond
HA5) Residential Only
$1.80-2.00
5 -10
No Change
79 -60
Slurry Seal SS
$2.70-3.70
3 -5
Moderate to Good
79 -60
Micro-Surfacing MS
$5.00-6.00
5 -7
Good to Excellent
79 -60
Conventional Chip Seal
(CCS)
$2.70 - 3.70
5 -10
Moderate
79 -60
Asphalt Rubber Chip Seal
(ARC)
$4.75 - 8.50
7 -10
Moderate to Good
79 -60
Stress Absorbing Membrane
(SAM)
$6.00 - 7.00
7 -10
Moderate to Good
59 -30
Ca e Seal CS
$4.50 - 5.50
5 -10
Good to Excellent
59 -30
As halt Overla y (OL )
$6.50 - 7.50
10 -15
Good to Excellent
59-30
Mill & Overlay MOL)
$7.10 -10.10
10 -15
Good to Excellent
29 -0
Full Depth Mill & Overlay
$12.00 -15.00
20
Excellent
29 -0
Full Reconstruct
Includin Base
$26.00 - 30.00
20
Excellent
METHODS AND TREATMENT OPTIONS
Every three years, the Town's streets and subdivisions will be assessed to determine a
proper treatment method. The following distresses will be used to calculate an "Overall
Condition Index ", or OCI, to better determine the appropriate category.
Types of visual distress in Table B, (next page)
Table B 'Photo's taken November 2011
Brand new pavement Fog seal in 4 -5 years
No distresses or overlay Crack seal if needed
100 -91 Age 0 -1 year old Fix any distresses
Twin Peaks Rd
Recent overlay (no Fog seal in 2 -4 years
distresses) or new Crack seal if needed
90 -81 pavement. Fix any distresses
Age >1 year old
Pima Farms Rd
Light cracking - one Crack seal with fog seal
direction only transverse
80 -71 OR longitudinal) RN
Very light weathering
Postvale Rd
Cracking n both Crack seal with Microsurface�
directions; no other major if improved roadway
distresses Crack seal, AR chip with fog�� r. • u
Some weathering seal if strip paved
Block cracking is > � ei r R
Greir Rd
15'x15'
Block cracking is about Slurry seal or crack seal and
15'x15 overlay for MS &R's.
60 -51 Some alligator present AR chip with fog if locals
Weathering
McDuff Rd
Block cracking is < Mill and inlay if MS &R, or
10'x10' overlay only
50 -41 And /or up to 50% AR chip with fog if locals
alligator (stopgap treatment)
Weathering Gillette Rd
50% alligator Mill and inlay if MS &R
No significant potholes AR chip with fog if locals F�
40 -31 Weathering (stopgap treatment)
50% Block Schedule for reconstruct
Camino de Oeste
Up to 100% alligator Reconstruct if MS &R
Pavement chunks Scarify & compact subgrade
30 -21 popping out 6"
Weathering AR chip with fog if locals
Twin Peaks Rd (West, Pima
Severe deterioration Reconstruct
20 -11 Numerous potholes Full depth
Hardin Rd (Pima County)
Reverting to its natural Reconstruct
10 -0 Full depth
state (dirt)
Hardin Rd
Below is a category system established as a means to identify which treatment types
should be applied to a specific roadway. All categories will be extensively evaluated,
and those deemed beyond the scope of the Pavement Preservation Program, will be
recommended to the Capital Improvement Project (CIP) program.
Category A: minor cracking and patching, streets in this category are relatively
new and exhibit little to no visible signs of deterioration.
Category B: combination of moderate to severe raveling, cracking, minor
potholes and depressions.
Category C: exhibiting a combination of extensive raveling, cracking, major
depressed areas, alligator cracking and potholing.
The pavement preservation methods suggested below will provide the Town of Marana
the opportunity to extend roadway lifespan throughout the Town limits.
As new maintenance and repair strategies are implemented throughout the Town, the
performance of those methods will be monitored. The data will allow the Pavement
Preservation Committee to see the results of it's efforts, providing constant feedback for
process enhancement. Receiving updated roadway distress conditions results in timely
identification and repairs at problem locations. The CMMS can quantify and illustrate
the impact of postponing repairs to future years, and how those delays will negatively
affect future budgets. By spending strategically, we can continually improve the overall
condition index of Marana's roadways, while minimizing overall lifecycle expenditures.
The various treatment methods utilized in the Pavement Preservation Program are
described below: (All materials, construction and workmanship related to the following
pavement treatments shall conform to the Pima County /City of Tucson Standard
Specifications & Details for Public Improvements, 2003 Edition; ADOT 2008 Standard
Specifications for Road & Bridge Construction; ADOT 2007 Construction Standard
Drawings C- Series, Updated through May 2010; ADOT 1992 Standard Drawings B-
Series and the latest Town of Marana Standard Specifications and Details).
TREATMENT DESCRIPTIONS
Crack Seal (CR)
A method to fill and seal pavement surface cracks, preventing water and
incompressible material from entering the pavement structure. Crack sealing is done
routinely during the colder winter months when pavement cracks are most open and
ambient temperatures are between 45 °- 65° F. Hot sealants, consisting of asphalt
cement, and cold sealants, comprised of emulsified asphalt, can be used. Backer rods or
sand may need to be placed in wide cracks prior to sealing. Crack sealing can be done
ahead of other pavement surface treatments, but should be completed 6 -12 months
prior to prevent bleeding of sealant through the surface.
Advantages: sealing cracks can prevent accelerated deterioration of the pavement
structure at a low cost.
Disadvantages: slow process and time consuming. Often times work will take place at
night to allow the least impact on traffic.
Fog Seal (FS)
A light application of relatively slow setting asphalt emulsion diluted with water to the
proper consistency and sprayed for complete coverage onto a pavement surface, but not
too thick to cause a slippery surface. A fog seal works better on a coarse aggregate
surface where the asphalt emulsion has room to pond between the aggregate particles.
Fog seals are used to delay weathering of the pavement, waterproof the pavement
surface, improve the pavement's ability to keep water from penetrating the base course
or sub- grade, and reduce raveling. Fog seals are also used to renew aged asphalt
surfaces, seal small cracks and surface voids, or adjust the quality of binder in newly
applied chip seals. Fog seals are generally applied when ambient temperatures are at
60° F and rising. Fog seals are usually applied at 0.05 to 0.15 gallons /square yard of the
diluted asphalt emulsion.
Advantages: fog seals are inexpensive compared to other surface treatments and only a
distributor truck is required to apply the fog seal in most cases.
Disadvantages: expected life of the fog seal is generally shorter than other surface
treatments and re- application is recommended every 3 -4 years. If applied too heavily,
the fog seal could be slippery and hazardous for the road users. A dry choke cover,
usually consisting of clean sand or aggregate less than 0.25 inches in diameter, can be
applied to the surface to remedy this.
Asphalt Rejuvenators (ARJ)
Asphalt Rejuvenators are applied to existing aged or oxidized asphalt pavements to
restore pavement flexibility. As pavement ages, asphalt cement becomes brittle and
loses some of its binding qualities. Rejuvenating emulsions penetrate the asphalt
pavement, soften the brittle asphalt, and improve the asphalt cement's ability to bind
with the aggregate. The rejuvenating agent is also known to heal small cracks in the
pavement.
Advantages: surface rejuvenators are an inexpensive treatment to prolong pavement
life and delay major maintenance or reconstruction.
Disadvantages: may soften existing surface treatment layers which can become loose
and break up, may not evenly penetrate differing surface treatments and underlying
asphalt.
High Density Mineral Bond (HA5)
Modern material and chemical engineering product addressing slurry seal bonding
problems caused by incompatible particle charges between emulsion oils, aggregates,
and pavement surfaces. Utilizes industrial grade aggregates including slate and
corundum (aluminum oxide, ruby, sapphire type minerals) suspended in a neutral pH
emulsion oil with superior adhesive properties to traditional positively or negatively
(cationic or anionic) charged emulsions, forming a high density mineral bond mass.
Product is designed to lock up the emulsion binder between the mineral aggregates
very tightly and adhere to the pavement surface in a thin, dense, approximately 1/8"
thick layer, sealing both the product and pavement from environmental element
degradation. Product is produced and mixed with aggregate prior to shipping in
specialized agitating /re- circulating applicator trucks to keep the aggregate in
suspension and provide high degree of quality control of binder and aggregate
proportions. Warranted by the manufacturer for 5 years to not lose more than 25%
residual coverage or will be re- surfaced free of charge.
Advantages: durability, longevity, warranty, quality control superior to all other
emulsion products, reducing rate of pavement degradation and requiring less frequent
applications. Has a fine grained even - textured surface without loose aggregate or
excessive roughness, less expensive than slurry and about half the thickness.
Disadvantages: first applications performed in 2002, specialized equipment and
manufacturing offer little market competition development to date.
Slurry Seal (SS)
A slurry seal is a mixture of quick setting asphalt emulsion, fine aggregate, mineral
filler, additive, and water. There are three common sizes of slurry seal mixtures. The
three mixtures are Type III (3/8 -inch minus), Type II (1/4 -inch minus), and Type I (1/8-
inch minus). Generally, Type I slurry seals are used in parking lots and Type II and III
seals are used on streets and higher traffic roads. The ingredients are carefully
measured and combined on the project site and spread simultaneously in one pass over
the existing pavement surface at a particular thickness. The slurry mix is applied at the
thickness of the largest aggregate in the mix. The amount of aggregate, filler, additives,
and water is based on the mix design, depending on the component materials,
environmental conditions, and existing road surface. Typically, a specially designed
vehicle mixes the ingredients and spreads the slurry with a squeegee device. Slurry
seals will fill small surface cracks, stop raveling, and improve the skid resistance of the
pavement. Cracks wider than 1 /4 ' should be sealed prior to the slurry application. The
life expectancy is 4 to 6 years.
Advantages: a finished surface of a slurry seal treatment is smoother than a chip seal
treatment, while still skid resistant. Slurry seal treatments are commonly used in
residential areas, where light to moderate traffic loads are anticipated.
Disadvantages: may not hold up well to heavier traffic loads and volume expected
along main collector and arterial roadways. Industry lacks objective field test methods
to verify quality during installation. Material is more brittle than flexible paving grade
asphalt products, causing a tendency for small crazed surface cracking over time.
Scrub Seal (SCS)
The scrub seal process drags a brooming mechanism over the road surface after the
asphalt emulsion has been applied to fill the pavement cracks and voids. A layer of
sand or aggregate is applied over the emulsion, followed by another drag broom,
forcing the sand into the emulsion - filled cracks and voids. A pneumatic tire roller is
then used over the seal. The excess sand or aggregate is broomed off the roadway a few
hours after application, depending on weather conditions. Emulsified asphalt is applied
from 0.15 to 0.40 gallons /square yard. The sand or aggregate is applied at 10 to 20
pounds / square yard.
Advantages: will efficiently fill cracks up to 0.5 inch wide that would have normally
been filled by crack sealing.
Disadvantages: tests may be needed to determine what type of emulsion or polymer -
modified emulsion should be used for a particular application. Material is more brittle
than flexible paving grade asphalt products, causing a tendency for small crazed
surface cracking over time.
Micro Surfacing (MS)
Micro surfacing is similar in nature to a slurry seal operation, but allows a thicker layer
to be placed (0.4 to 0.6 -inch thick) and cures faster than a slurry seal. Micro surfacing
can be used on high volume roadways to correct wheel path rutting up to 1.5 inches in
depth with a single pass, and provides a skid resistant surface. Micro surfacing uses a
polymer - modified emulsion mixed with crushed aggregate, mineral filler (cement, lime,
limestone dust, fly -ash), water, and additives. The additives influence the mix time and
set time.
Advantages: can be placed in a thicker layer than a slurry seal and therefore, can be
used to fill wheel ruts and correct minor leveling problems. It has a quicker cure time,
so traffic can be allowed on the road sooner than a slurry seal. It is a cold system with a
temperature limitation of 50 °F and rising. This allows many micro surfacing operations
to be done at night, when traffic is least affected. The life expectancy is 6 to 8 years. Also
provides a much smoother riding surface
Disadvantages: requires special equipment that is heavier and sturdier than a slurry
machine. The cost is higher than a slurry or chip seal treatment. Material is more brittle
than flexible paving grade asphalt products, causing a tendency for small crazed
surface cracking over time.
Conventional Chip Seal (CCS)
Chip seals are the most common surface treatment for low - volume roads. A chip seal is
an application of asphalt, followed by an aggregate cover. The asphalt is usually
applied as hot asphalt cement, cutback asphalt, or emulsified asphalt. After the hot
asphalt cement, cutback asphalt, or asphalt emulsion is applied to the pavement
surface, aggregate is immediately applied over the asphalt before the hot asphalt
cement cools, or the asphalt emulsion breaks. Chip seals should be placed when the
ambient temperature is 70 °F and rising. Pneumatic rollers are used to reorient, or seat,
the aggregate particles and tighten the rock matrix. After the asphalt cures, the excess
aggregate is removed by "brooming ". A distributor truck dispenses the asphalt
emulsion, asphalt cement, or cutback asphalt, a rock spreader applies the aggregate,
pneumatic rollers reorient or seats the aggregate particles, and a mechanical broom
removes the excess aggregate. Emulsified asphalt is applied from 0.30 to 0.50
gallons /square yard. The type and size of the aggregate particles vary, but usually they
are between 3/8 to 1/2 inch in size, and are uniformly graded and free of fines (dust
particles too large to pass through a sieve). The aggregate is applied at 25 to 50
pounds /square yard. A chip seal application corrects raveling and seals small cracks on
the old pavement surface, while providing a new skid resistant surface. Chip sealing
may also be used following crack sealing. The expected life of a chip seal is 4 to 6 years.
Advantages: chip - sealing equipment and methods are common to most paving
contractors and can be applied at a reasonable cost.
Disadvantages: requires constant attention and frequent adjustment of application rates
of aggregate, and especially asphalt, to minimize chip loss, fly rock, bleeding, and other
problems. Making these adjustments takes considerable experience and knowledge.
Windshields can be damaged by the loose aggregate before the excess is removed, and
dust is created during the brooming of the loose aggregate.
Stress Absorbing Membrane (SAM)
This is a chip seal application normally associated with Asphalt- Rubber (AR) or
Polymer Modified Asphalt Rubber (PMAR). These are elastomeric binder materials and
both contain high percentages of recycled tire rubber, SBS polymer and other modifiers,
as required by individual project specifications, which result directly in improved
physical and chemical properties, along with a very high viscosity, allowing for
increased application rates (0.55 to 0.75 gallons /square yard). A fog seal coat is applied
to the surface after final sweeping has been completed. These improvements lead to
resistance to aging, which means a lower oxidation rate due to the presence of carbon
black and various antioxidants, which are present in recycled fire rubber. There is also
improved cohesive strength, which means that the binders can support greater loading
when stretched, allowing for improved deformation and crack resistance. Improved
elasticity and resilience results in additional resistance to cracking and flushing (higher
softening points), allowing the pavement surface to be more stable in hot weather and
improved flexibility and crack resistance in cold weather. The same equipment and
process are used as the conventional chip seal.
Advantages: increased life cycle cost benefits ( +6 years).
Disadvantages: substantially increased cost when compared to a conventional chip seal
and the same process related concerns as those associated with a conventional chip
seal. Material is more brittle than flexible paving grade asphalt products, causing a
tendency for small crazed surface cracking over time.
Asphalt Rubber Chip Seal (ARC)
Utilized in the same manner as the SAM application above, but the rubberized asphalt
is applied at a lower rate (0.30 to 0.50 gallons /square yard) depending on the existing
pavement condition, which is usually in a higher range.
Cape Seal (CS)
An application of a Convention Chip Seal followed by a Slurry Seal, the term "cape" is
derived from Cape Province of South Africa where this process was developed. A chip
seal is applied to the road, and then the excess aggregate is removed after the asphalt
has cured. The slurry is then applied over the chip seal treatment. The application
process is the same as the chip and the slurry seals stated earlier. Life expectancy is 6 to
8 years.
Advantages: CS increases the life of a chip seal by enhancing binding of the chips and
by protecting the surface. The cape -seal provides a much smoother riding surface,
which does not have any loose aggregate and creates a dense mat.
Disadvantages: cost increase and equipment for both the chip -seal treatment and the
slurry -seal application is required. The construction process is longer than either a chip -
seal treatment or a slurry -seal application. Material is more brittle than flexible paving
grade asphalt products, causing a tendency for small crazed surface cracking over time.
Asphalt Rubber Cape Seal (ARCS) or Polymer Modified Asphalt Rubber Cape Seal
(PMAR)
Application of a SAM treatment followed by a Type II Slurry Seal applied in residential
areas or a Micro Surface, which is applied on collector or major arterial streets.
Advantages: increased life of the stress absorbing membrane and the same as the Cape
Seal above.
Disadvantages: same as Cape Seal.
Stress Absorbing Membrane Interlayer (SAMI)
An application of a SAM treatment utilized with an overlay of conventional hot mix
asphalt.
Advantages: excellent at filling cracks, healing existing deteriorated asphalt surfaces
and preventing existing cracks from reflecting through new overlay, restores to new
and smooth asphalt surface.
Disadvantages: relatively expensive, cannot be used where drainage will be adversely
affected by raising the roadway surface, requires shoulder build -up in uncurbed areas.
Asphalt Overlay (OL)
The process of covering the existing, severely distressed, pavement structure surface
with a thin lift of hot mix asphaltic concrete to provide a "like new" surface with
prolonged structural life. A hot mix asphalt lay down machine would be used for the
placement of the new mat.
Advantages: restores roadway to new and smooth asphalt surface.
Disadvantages: same as SAMI, and does not prevent reflective cracking; however the
use of rubberized asphalt increases the crack preventing qualities of the overlay.
Mill and Overlay (MOL)
The process of removing a portion (up to the full thickness) of the existing distressed
asphalt pavement surface and covering the remaining surface with a new, thin (or full
depth) lift of hot mix asphaltic concrete. A milling or pulverizing machine would be
used in conjunction with loading equipment for the removal of the distressed asphalt
layer. A hot mix asphalt lay down machine would be used for the new asphalt
placement.
Advantages: restores roadway to new and smooth asphalt surface without raising
pavement surface elevation, appropriate where curb reveal and surface drainage need
to be maintained, and pavement substructure below are sound.
Disadvantages: cannot be used in subdivisions and other street sections where only 2"
of asphalt are common; requires a thick enough existing asphalt to remain below the
milled surface to support traffic during re- construction, relatively expensive.
Full Depth Mill & Overlay
The full thickness removal of distressed asphalt down to the aggregate base course by
milling, minor grading and re- compaction of the aggregate base surface, then re- paving
the original thickness of asphalt removed. Appropriate where asphalt failure is due to
aging and surface damage only, and the original pavement thickness still meets the
minimum design standards for traffic loading in that location.
Advantages: same as MOL, can be used in subdivisions and other thin asphalt sections.
Disadvantages: relatively expensive, disrupting to regular traffic and susceptible to
traffic damage during construction; will not correct settlement or soil support
deficiencies beneath the pavement section, and will not increase the traffic loading
capacity.
Full Reconstruct Including Base
Complete removal and replacement of entire pavement section; asphalt, aggregate base
course, reconditioning of existing sub -base soils, removal and replacement of unsuitable
material and deficient utility backfill. Reconstruction may include thicker pavement
section or alternative materials to compensate for problem soils or increased traffic
loading than original design. May incorporate revised grading to improve drainage
conditions.
Advantages: can incorporate new design and engineering solutions to deal with
changed, anticipated, or inadequate conditions; can correct settlement or soil support
deficiencies beneath the pavement section, increase the traffic loading capacity and
improve drainage conditions. Roadway returned to new and smooth condition.
Disadvantages: very expensive and disruptive to regular traffic.
CONCEPTUAL TREATMENT SCHEDULE
Below is a graph illustrating the use of varied types of treatment options and how they
could be scheduled to preserve the life of a given roadway. In addition, the costs
associated with the work are also shown to demonstrate the fiscal advantages of
proactive prevention. In a similar fashion, such a chart will be generated for each of the
Town's roadways to aid in treatment selection. These charts can be modified through
time, as changing conditions (budgetary constraints, traffic volumes, development
requirements) warrant.
Year
Treatment
Cost
Year
Treatment
Cost
3 Crack seal $ 8,820.00
3 Fog $
9,800.00
Fog & Crack
6
Crack seal
$
8,820.00
7
Seal
$
18,620.00
Moderate
9
Crack seal
$
8,820.00
11
Treatment
$
37,800.00
12
Crack seal
$
8,820.00
15
Fog
$
9,800.00
Fog & Crack
15
Crack seal
$
8,820.00
19
Seal
$
18,620.00
Moderate
18
Crack seal
$
8,820.00
23
Treatment
$
63,000.00
21
Crack seal
$
8,820.00
24
Full reconstruct
$
364,000.00
Existing Cost : $ 42a OQ
Proposed Cost : " "$
1,57,640.0(
13
TOWN OF MARANA
Street Inventory
FY 2012 - 2013
through
FY 2017 - 2018
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COMMITTEE RECOMMENDATIONS
The Town of Marana's Pavement Preservation Committee recommends a three element
approach to preserving and improving the Towri s infrastructure.
The first is stemming the degradation taking place by proactively treating roadways
with extensive fog - sealing regimens. A fog seal is a relatively inexpensive, topical
application that works like a coat of paint on a house. A fog application waterproofs
and provides a barrier from the effects of the sun's UV rays and the damage caused by
exposure to the elements. This treatment substantially slows the degradation of
asphalt, extending its useful life to delay or avoid more expensive rehabilitation. A
typical fog application is only effective for three or four years before re- application is
necessary. Therefore, the Committee recommends fog - sealing the Town's entire
infrastructure at regular intervals. The estimated yearly cost is $576,552 (estimated
average), excluding yearly commodity price inflation. Approximately 1/4 of the town's
infrastructure will be sealed each year. (Roads only surfaced with chip seal, without
asphalt, will not be fog sealed on an annual basis.)
The second element to Marana's Pavement Preservation Program is infrastructure
rehabilitation. Fog sealing only preserves existing roadway conditions by substantially
slowing, but not eliminating, degradation of asphalt. In an effort to bring our roadway
infrastructure to an acceptable level there must be additional surface treatments applied
to increase the pavement's overall condition index (OCI). These treatments are
substantially more expensive than a fog -seal, but they provide the benefit of extending
the useful life of the roadways. The Committee. recommends allocating an additional
$1,776,377 (estimated average) specifically for pavement rehabilitation. The entirety of
the towns roadway infrastructure would be brought up to an "acceptable" condition
within approximately six years. Once this milestone has been reached, the program will
focus on minor rehabilitation to roadways that are in acceptable condition, preventing
further decay. The total cost of the first two plan elements is approximately $2.36
million per year (fog - sealing = $576,552 + $1.78 million rehab). A six -year pavement
rehabilitation cost estimate has been provided.
The final element is addressing roadways that require work beyond the program's
scope. Roadways that need an engineer's design for repair will be referred to the CIP
department for inclusion into its program.
Each year, the Committee will meet to evaluate the program's progress and make
recommendations. Annual progress reports will be provided to department heads for
review and consideration.
Rather than allowing our roads to fail and then incur the cost and inconvenience of a
full reconstruction, the Pavement Preservation Program will maintain a higher quality
roadway surface, at approximately 1/3 the cost of a full reconstruct. The Committee
strongly urges adoption of this program, ensuring the Towns infrastructure remains a
regional example of excellence by providing quality roads for our residents and visitors.
MARANA
w /1\
2013 Preliminary
Capital Improvement Plan
Tuesday May I. 2012
Process - Background MARANA
w /I\
• Guide the development of the annual
capital budget & multi-year CIP
• Prioritize infrastructure needs and include
ongoing maintenance costs
• Identify options to address & fund priorities
1
_-- .-a•
Projects Completed FY 2012 MARANA
• ARRA Marana Rd pavement Preservation
• Hartman to Cortaro Water Interconnect
• Cortaro /Silverbell Intersection Improvements
• MMC Parking Lot sealing & concrete flatwork replacement
• Network InfrastructurerReplacement
• Continental Ranch Parcel 8 Paving project
• Shared Use Path Phase II
• Camino de Mariana 16" WaterLine
• 'Camino de Mariana Roadway (Twin Pks Interchange)
Project funded in part by Pima County Bond Funds - a secondary property tax to Marano Residents
MARANA
/t\
Planned Projects for 2013
2
Projects Introduced for
MARANA
Consideration in FY2013
• Cortaro/Silverbell Rd Multi -Modal Shared Use
Path
• Costco Drive Rebuild (Design Only)
• Cracker Barrel Rd Pavement Restoration
(Design Only)
• Land Acquisition for Multi -Use Public Facility
(includes Parks /Operations /Police) Multiple
Sources = $225K
• Silverbell Landscaping Improvements
MARANA
i
%1\
Projects By Funding Source
3
�r ti �
General Fund MARANA
ow
• Honea Heights Septic Conversions &
Sidewalks ($l ,900 General Fund + $2.1 M
Federal Funding)
• Barnett Linear Park & Flood Control
Drainage Improvements $90K
1
,,JrA.„.....,
'/2 Cent Sales Tax Fund MARANA
w /1\
• Thornydale Rd, Tangerine to Saguaro Ranch
Paving ($61.5K 1/2 cent sales tax + $422K
Transportation Fund)
4
Transportation Fund
MARANA
=/I\
• Completion of existing projects (Silverbell Rd,
Cortaro Farms Rd, Thornydale/Tangerine
Intersection) $28.8K
• Santa Cruz Shared Use Path Phase 111- $376K
Transportation
• Thornydale Rd - Tangerine to Saguaro
Ranch - $483.5K ($422K Transportation &
$61.5K 1 /2cent Sales Tax)
HURF Fund MARANA
• ARRA - Paving Rehabilitation $5K - HURF
• Camino de Manana/Dove Mountain Extension $52K HURF
• Thornydale Rd - South of Tangerine Pavement Restoration
$100K
• Costco Drive Rebuild (Design Only) $70K
• Cracker Barrel Road Pavement Restoration (Design Only) $35K
• Camino Martin/Jeremy Pl. Pavement Restoration (Design
Only) $23K
• Massingale Rd - Pavement Restoration (Design Only) $20K
• Silverbell Landscaping Improvements $100K
• Price Lane Drainage Improvements $105K
5
Parks Impact Fee MARANA
• Santa Cruz River Shared Use Path 11 (Project
Wrap -up) $5K
■Cortaro Silverbell District Park $16.2K
• Cortaro Rd Multi-Modal Shared Use Path
0 Connectivity Crosswalk $225.5K
• Heritage Improvement Projects $75K - Park
Impact Fees
Outside Funding Sources MARANA
• Tiffany Loop Drainage (Project Wrap -up) $9K - RTA
• Linda Vista Twin Peaks Rd. (Project Wrap -up) $4K - RTA
• Marana Heritage & Cultural Park $225K Grants
• Tangerine Rd Corridor $6.75M - RTA
• Honea Heights Septic Conversions $2.1 M- Grants & $1.9K
General Fund
• Bridge on Avra Valley Rd. at the E. Brawley Wash $67.5K
Developer
• Safe Routes to School $75K Federal Grants
• Downtown Sidewalk Infill - Safe Routes to School $187K PAG
Regional Funds
6
Airport Fund MARANA
• Construct Taxiway K $1.326M - Federal &
State Aviation Grants, Airport Operating
• Construct Bypass Apron $966K - Federal &
State Aviation Grants, Airport Operating
• Environmental Assessment $200K - Federal &
State Aviation Grants, Airport Operating
Water Utility Funds MARANA
• CAP Allocation Purchase $450K - Gravity Storage,
Impact Fees
• Well rehabilitation & electrical upgrades $225K -
Water Operating Fund
• Integrated Telemetry & SCADA $525K - WIFA, Water
& Wastewater Operating
• Water Line rehab & replacement $1 M - Water
Operating
• Sunset Ranch Purchase $66K - Water Impact Fees
Wastewater Funds MARANA
• Marana Water Reclamation Facility $8M -
Wastewater Capital Fund
Marana Water Reclamation Facility Bio-
solids $600K - Wastewater Capital Fund
• Constructed re-charge for effluent $500K
Renewable Resources Fund
Changes to next year's CIP
MARANA
process
• Link to Strategic Plan document and future
Facilities Master Plan document
• Project vetting with Manager's Office and
Council at beginning of CIP cycle
• Presentation formatting
8
FY2013 CIP Summary - $22.8M MARANA
.././ \
RTA, $6.8 , Impact Fees ,
PAG $0.2 , 1
1 , ts,„
/ Grants &
';4 _Contributions,
HURF, $0.5 , 2% 1 /2 Cent Sales
Transportation Tax, $0.1 , 0%
Fund, $0.8 , 4% I _
_
General Fund,
$0.1 , 0%
Fund Balance/
Net Assets, $2.3 Bonds, $8.7 ,
, 10% 38%
MARANA
Town of trAarana
Pavement Preservation Program
P repared Works Department
P avement Committee
,,„
vww.marana•com
TOWN OF MARANA PRELIMINARY FY2013 CIP
CI P# Project Name FY2013
Total
2011 - 430 -004 American Recovery & Reinvestment Act - Paving Rehabilitation 5,000
2003 -016 Barnett Linear Park & Flood Control Project 90,000
2012- 430 -015 Bridge on Avra Valley Rd at the East Brawley Wash 67,500
2001 -052 Camino De Manana /Dove Mountain Extension 52,000
2013 -019 Camino Martin /Jeremy Pl. - Pavement Restoration 23,000
1999 -076 Cortaro Farms Road Reconstruction 99 -076 2,500
2013 -024 Cortaro Road Multi -Modal Shared Use Path Connectivity Crosswalk 225,500
1999 -012 Cortaro Silverbell District Park 16,206
2013 -020 Costco Drive 70,000
2013 -022 Cracker Barrel Road Pavement Restoration 35,000
2013 -016 Downtown Sidewalk Infill - Safe Routes to School 187,000
2009- 610 -002 Heritage Improvement Projects 75,000
2002 -002 Honea Heights Septic Conversions & Sidewalks 2,086,900
2001 -044 Linda Vista /Twin Peaks Interchange @ 1 -10 4,000
2003 -061 Marana Heritage and Cultural Park 225,000
2013 -021 Massingale Road - Pavement Restoration 20,000
2013 -027 Multi -Use Public Facility (Includes Police Substation) 225,000
2010 - 430 -022 Price Lane Drainage Improvements 105,000
2003 -006 Safe Routes to School 2003 -06 75,150
2006 -001 Santa Cruz River Shared Use Path - II - 2006 -001 5,000
2009 - 430 -016 Santa Cruz Shared Use Path - Phase III 376,000
2013 -038 Silverbell Landscaping 100,000
1999 -050 Silverbell Rd Sanitary Sewer Interceptor Project 25,000
2005 -061 Tangerine Road Corridor 1 -10 to La Canada 6,755,000
2006 -012 Thornydale /Tangerine Intersection 1,323
2013 -018 Thornydale Road - S. of Tangerine - Pavement Restoration 100,000
2006 -004 Thornydale Road, Tangerine To Saguaro Ranch 483,500
2012 - 430 -006 Tiffany Loop Drainage 9,000
Total Non - Enterprise Fund Projects $ 11,444,579
2009- 900 -004 CAP Allocation Purchase 450,000
2012- 170 -009 Integrated Telemetry and SCADA 525,000
2012 - 900 -013 Sunset Ranch purchase 66,000
2010- 900 -034 Water line rehabilitation and replacement 1,026,000
2012 - 900 -014 Well rehabilitation and electrical upgrades 225,000
2013 -040 Constructed Re- charge for effluent 500,000
2010 - 910 -023 Marana WRF 8,000,000
2012 - 910 -003 Marana WRF Biosolids 600,000
Total Enterprise Fund Projects $ 11,392,000
Total CIP Projects $ 22,836,579