HomeMy WebLinkAbout4.5 Pervious Concrete Shannon Parking Lot CITY OF DUBLIN
AGENDA STATEMENT
City Council Meeting Date: September 28, 1992
SUBJECT: Request of City Council's Support for Pervious Concrete
Project Submitted for Funding from Alameda County Urban
Runoff Clean Water Program (ACURCWP)
Report by: Public Works Director Lee Thompson
EXHIBITS ATTACHED: Pilot Study Proposal for grant funding.
RECOMMENDATION: That the City Council authorize submittal of and support the
pervious concrete project for grant funding and that the
ACURCWP Committee be informed of this action.
FINANCIAL STATEMENT: Cost to the City will be reimbursed by the grant funding.
DESCRIPTION: The Alameda County Urban Runoff Clean Water Program
(ACURCWP) faces the monumental task of cleaning up the County's storm water for
discharge into the San Francisco Bay through a National Pollution Discharge
Elimination System permit. As one way to accomplish this major undertaking, the
ACURCWP put aside $300,000 to encourage agencies to propose pilot projects to
improve the quality of storm water in a cost effective way that, if effective, other
agencies could use.
The City of Dublin's Public Works Department has developed a pilot project proposal
to install pervious concrete in the Shannon Park parking lot contingent on City
Council approval (Exhibit 1) . Pervious concrete has been utilized widely in England
and Florida for several years with considerable success. The San Francisco Bay Area
has had very little experience with this material and its uses.
Pervious concrete is a porous mixture of gravel and concrete which allows storm
water with small polluting particles to flow through the concrete. A layer of sand,
approximately 1 to 2 feet in depth, would be installed under the pervious concrete
to act as a filter. Leaves and larger particles will stay on top of the pervious
concrete and will be picked up by the parking lot sweeper and the sand would filter
out waterborne pollutants. The pervious concrete would reduce the maintenance cost
of cleaning the storm drain inlet and keep leaves and debris from going down the
storm drain to the creek. It is estimated that the sand will need to be replaced
every 20 to 30 years. After removal, this same sand can be used for road
construction.
The total estimated project cost, including Staff time, is $33,600. If our project
is accepted by the ACURCWP Committee, they will pay all of the cost associated with
it. The ACURCWP Committee has received requests for over $500,000 in funding of
pilot projects from different agencies. Agencies will be notified by October 27,
1992 which projects have been accepted for funding.
Staff is recommending that the City Council authorize submittal and support of this
pervious concrete project and that the ACURCWP Committee be informed of this action.
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ITEM NO.- COPIES TO: ACURCWP Committee
CITY CLERK
FILE 0
L�
PERVIOUS CONCRETE & SAND FILTER
PILOT STUDY PROPOSAL
FOR
CITY OF DUBLIN & ALAMEDA COUNTY
URBAN RUNOFF CLEAN WATER PROGRAM
PREPARED FOR
ALAMEDA COUNTY URBAN RUNOFF CLEAN WATER PROGRAM
BY
MARK HICKS
CITY OF DUBLIN ENGINEERING TECHNICIAN
AUGUST 1992
i
• i
INFORMATIVE ABSTRACT
Storm water from parking lots is a major contributor to the storm
water pollution that the Alameda County Urban Runoff Clean Water
Program is mandated to clean up.
The proposed pilot study will give the Program some hard answers
on how well porous concrete and sand filters work in areas that storm
water runs across unchecked and into the storm drain system.
The porous concrete will filter out the large debris while the
coarse sand will trap the suspended solids . The draw down system
works to collect the filtered water and to drain an area that has a
high water table.
_ 1 _
i
INTRODUCTION
Subiect & Purpose
The Alameda County Urban Runoff Clean Water Program (ACURCWP)
faces the monumental task of cleaning up the County' s storm water for
discharge . into the San Francisco Bay through a National Pollution
Discharge Elimination System Permit. The following pilot study
proposal offers an alternate method of treating storm water runoff
which is cost effective and can be used in the initial design of a
development or as a retrofit.
Background
Pervious concrete was first used in England in the mid-1960 ' s and
in the United States in the 70 ' s . It has been used for parking lots,
light traffic roadways and driveways with exceptional results .
With new technologies and more demands on the environment, the
pervious concrete of today has been refined to meet a variety of
needs , and it works well with other design considerations such as soil
types, site plans, water retention and water quality.
Need
The San Francisco Bay Region has had very little contact with
pervious concrete and its uses . As stated in the Storm Water Quality
Controls for New Developments in Santa Clara Valley and Alameda
County: A Guide for Controlling Post-Development Runoff, Draft_
Report, "very little information is available locally about the use
of pervious concrete. " In addition to pervious concrete, the use of
a sand filter draw down system under the porous concrete has not been
tested in this area.
2 -
I
PROPOSED PILOT STUDY
The following plan is designed to intercept the storm water from
a large parking lot by placing pervious concrete in an area where the
water collects . The storm water passes through the concrete and
through a sand filter before being picked up by a perforated collector
pipe and deposited in the storm drain system.
Pervious Concrete
Pervious concrete is made up of 3/8" gravel, Type II cement and
water, with a water/cememt ratio at approximately 0 . 37 . The pervious
concrete is used for driveways, parking lots, low volume streets,
exfiltration systems , airport taxiways, and for retrofitting parking
areas where rainwater is needed for landscaping.
Sand Filter
The layer of sand under the pervious concrete is used to filter
out the pollutants that come from the parking lot. This sand layer is
approximately 1 ' to 2" in depth and is graded to drain to the eastern
edge of the project.
Draw Down System
In a trench located at the downhill side of the parking area,
there is a perforated PVC pipe with a geotextile cloth sock to keep
the sand out and let the water pass through.
Monitoring
The City will take samples of storm water before installation
of the pervious concrete for one rainy season. Also, City will take
samples of storm water after installation of pervious concrete. City
will compare the results of these two rainy season samples before and
after installation of pervious concrete to determine the improvement
of water quality that was gained by installing the pervious concrete .
Samples of the storm water would be tested for: 1) nickel,
copper, zinc, chromium, lead and cadmium; 2) total suspended solids;
3) grease and oils (total petroleum hydrocarbons) ; as well as a
control sample from the same parking lot which had not been filtered.
Each week, a visual inspection of the pavement' s surface will let us
know if there is any ravelling taking place. Since the water would be
entering the pervious concrete 20 ' back from the existing curb, the
debris will be collecting along the edges of the old and new pavement.
The accumulated debris along this place where the water enters the
sand filter can be collected and considered as material that did not
make it down the storm drain.
3 -
PROJECTED COSTS
ITEM COST
MOBILIZATION $ 300 . 00
DEMOLITION OF EXISTING A.C. /EXCAVATION/GRADING 3,500 . 00
FILTER FABRIC 1, 000 . 00
COARSE SAND 4 , 000 . 00
PERVIOUS CONCRETE 4,500 . 00
12" PERFORATED PVC PIPE W/SOCK 700 . 00
PARKING STRIPES 150 . 00
40 SAMPLES AND TESTING 7 ,750 . 00
REPORT - 20 HOURS AT $35 . 00/HOUR 700 . 00
MONITORING/VISUAL INSPECTION/MAINTENANCE 2, 000 . 00
DESIGN & INSPECTION 4 , 000 . 00
TEST LAB (MIX DESIGN-SOIL
COMPACTION-CONCRETE SAMPLES) 2,000 . 00
$30, 600 . 00
CONTINGENCY 3, 000 . 00
TOTAL $33, 600 . 00
4 -
CONCLUSION
Pervious concrete, coupled with a sand filter, will enable the
Program Participants to design or retrofit parking areas, washing down
stations , or driveways . The information collected will enable the
Participants to evaluate the effectiveness of this procedure, as well
as the many other uses for pervious concrete.
The City of Dublin urges the Allocation Committee to approve
the Pervious Concrete with Sand Filter Project for construction and
monitoring.
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VICNITY MAP - -- --- _ .
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