HomeMy WebLinkAbout8B - Stormwater Grant Opportunity
MEETING DATE:
AGENDA #:
PREPARED BY:
AGENDA ITEM:
PRESENTATION:
JANUARY 4, 2010
88
Ross Bintner, Water Resources Engineer
PRESENTATION OF sTORMWATER TREATMENT GRANT OPPORTUNITY
The City of Prior Lake manages its stormwater treatment system to continually
improve pollutant removal efficiency. Water quality ponds are the single
largest ongoing investment in the treatment system, their improved function
can have an immediate effect on the quality of our lakes, wetlands and
streams.
The City is currently cleaning and retrofitting 6 of the 135 total treatment ponds
to removed accumulated sediment, restore and enhance their planned
treatment effectiveness, and meet increasingly strict water quality
requirements. Staff has recognized a potential new method to increase
system efficiency and test this innovate treatment method as part of the 2009
Water Quality Pond Maintenance (City project 09-013), currently under
construction.
By taking advantage of a project already in place, a new method of treatment
can be tested at relatively low cost, potentially leading to further state, and
national investment in, and study of, the Prior Lake water quality treatment
system.
Staff is not proposing any action as part of this presentation, but will ask the
City Council if it wishes to direct the staff to prepare a grant application to the
Scott Watershed Management Organization and Prior Lake Spring Lake
Watershed District pursue this opportunity.
www.cityofpriorlake.com
c~IwI).~!~~tfk~-~}9~QPt ir,lclf~ 9,R~,;;lfElA245
RIO/,
, %:
t....~~....
u~a,
~JNNESo1" '
STORMWATER
TREATMENT
IJill'GRANT PRESENTATION
\)
ESO~'
2030 VISION-NATURAL
R10-l1 RESOURCES
FIVE-YEAR GOAL: Implement plans to
monitor and improve surface water
quality (i.e. lakes, ponds, wetlands,
streams, storm water runoff and
non-point runoff) in accordance with
the Local Surface Water
Management Plan.
~
r
~\
ESO .
WATER QUALITY STANDARDS
RIO~:.ALWAYS CHANGING
~ 1990 ~~i~~T~~1E~SACCJA~~TJ~~~INATlON
SYSTEM (NPDES) PHASE I
2004 MINNESOTA PHOSPHORUS
FERTILIZER BAN
2005 CLEAN WATER ACT NPDES PHASE II
2005 NON-POINT FOCUS SHIFTS TO
POLLUTION PREVENTION AT THE
SOURCE
2010 UPPER PRIOR/SPRING LAKE TOTAL
MAXIMUM DAILY LOAD (TMDL)
2011 THIRD GENERATION NPDES MS4 PERMIT
...."
1"'"
ESO~\
RECENT STORMWA TER
RIO '.' GRANTS
, A"
"Ii
. 2008 NEIGHBORHOOD
RAINGARDENS
. GRAINWOOD BIO-RETENTION
BASIN
.' . SWEEPING PROGRAM GRANT
E! SO~ \" . COUNTY ROAD 12 BIO-RETENTION
AND INFILTRATION GRANT
RUNOFF MANAGEMENT
TREATMENT TRAIN
.
SAND IRON FILTER GRANT
RIO... OPPORTUNITY
'4..
. CITY CURRENTLY CLEANING AND
RETROFITTING 6 OF 135 PONDS
. INNOVATIVE SAND/IRON FILTER
. USE POND PROJECT ALREADY BID TOWARD
LARGER GRANT OPPORTUNITIES AND
STUDY
. COST TO ADD IRON TO THE FILTER BENCH
LOW COMPARED TO GRANT POTENTIAL
. GRANT COMING TOGETHER QUICKLY - OTHER
CITY PARTNERS SUPPORT PROPOSAL
. WANT CITY COUNCIL DIRECTION BEFORE
OFFICIALLY SOLICITING PARTNERS
~
..........
O~\;
ES
WHAT IS AN IRON SAND FILTER
RI &ND HOW DOES IT WORK?
'4. SAND FILTER ALREADY PLANNED -
IRON ADDED AND MIXED WITH
SAND
. DISSOLVED PHOSPHORUS REACTS
AND BINDS TO IRON PARTICLES
. REMOVING DISSOLVED
PHOSPHORUS WITHIN THE
TREATMENT PONDS REDUCES
ESO'\ PHOSPHORUS TO DOWNSTREAM
LAKES AND STREAMS
c;")l
2.
l: ~ .../"'>'..---7'~~
$
"3
'''. 2-
""''''-~''"'~--,...,.""",~
/A~
SAND IRON FILTER BENEFITS
RI 0 ~.lABORATORY TESTS SHOW PROMISING DISSOLVED
t PHOSPHORUS REMOVAL RATES
SMALL INITIAL INVESTMENT NOW COULD INITIATE
LARGE STATE AND FEDERAL STUDY DOLLARS
. IF THIS CONCEPT IS SUCCESSFUL IN THE FIELD, THE
SAND IRON FILTER COULD BECOME ANOTHER
PRACTICE THAT CAN BE USED TO MEET FUTURE
. TMDL STANDARDS
..,:i:icc::<':VFUTURE LOW COST BMP-SAND IRON FILTER CAN
BE RETROFITTED INTO ALREADY CONSTRUCTED
PONDS FOR A RELATIVELY LOW COST IF COMBINED
\7.. WITH REGULAR POND MAINTENANCE
ESO"\ v
ANNUAL POLLUTANT
RI O~EDUCTION LIABILITY
~...C
. ASSUMING TMDL STANDARD PHOSPHORUS
LOADING RATE OF 5,000 POUNDSNEAR
. SAND IRON FILTER COULD LOWER
AVERAGE POND TREATMENT RATES FROM
$440 PER POUND OF PHOSPHORUS TO $410-
\$260 PER POUND OF PHOSPHORUS
--"vTHIS RESULTS IN A MINIMUM LONG TERM
~ POLLUTANT REDUCTION LIABILITY
:-\ ~.SAVlNGS OF $150,000 WHICH COULD
ESO . INCREASE SUBSTANTIALLY DEPENDING ON
THE FILTER PERFORMANCE
COST TO PURSUE GRANT
RIO:
~
. CITY STAFF TIME INVESTMENT OF
APPROXIMATELY 40 HOURS
. $7,000 INCREASE TO POND
MAINTENANCE PROJECT
(SUCCESSFUL GRANT FROM
WATERSHED DISTRICT AND SCOTT
WATER MANAGEMENT
ORGANIZATION TO COVER THIS
COST)
~'
~~:
ESO
RIO,
-.tfj
'+'il"}':">>>>'-,:: '
...",w
'i"._,..."..... "
<<h
ESO~\
RI04
.,,'
ESO'\ \"
NEXT STEPS
WITH CITY COUNCIL DIRECTION, CITY STAFF
WOULD PURSUE GRANT WITH WATERSHED
DISTRICT AND SCOTT WATER MANAGEMENT
ORGANIZATION
IF GRANT IS APPROVED, IRON WOULD BE
ADDED TO THE SAND FILTER ON TWO PONDS
IN LATE JANUARY OR EARLY FEBRUARY
SAMPLING AND TESTING OF SAND I IRON
FILTERS IN MAY
IN JUNE, CITY, WATERSHED DISTRICT, WATER
MANAGEMENT ORGANIZATION AND
UNIVERSITY OF MINNESOTA APPLY FOR
SIGNIFICANT STATE AND FEDERAL GRANT
DOLLARS FOR STUDY OF THE SANDIIRON
FILTER
QUESTIONS?