2007-04-23 Jt Mtg Agenda packetAGENDA
GOLDEN VALLEY ENVIRONMENTAL COMMISSION,
OPEN SPACE AND RECREATION,
AND
GOLDEN VALLEY PLANNING COMMISSION
Joint Meeting
Golden Valley City Hall, 7800 Golden Valley Road
Council Conference Room
Monday, April 23, 2007
6:00 PM
Joint Meetin_g
1. Comprehensive Plan Update for 2008
Individual Commissions Adjourn to Separate Rooms
1. Call to Order
2. Approval of Joint Meeting Minutes — January 22, 2007
3. Approval of Environmental Commission Minutes — January 22, 2007
4. TMDL (attachments)
5. Annual Report Due March 1, 2007
6. Program/Project Updates
A. 1/1 Inspection Status
B. Lighting Ordinance Status
C. Deer Management Status
D. Open Space & Recreation Commission Minutes — January through
February, 2007 (No March meeting) (receive and file)
7. Commission Member Council Reports
8. Other Business
9. Adjourn
GAEnvironmental Commission\Agendas\2007\042307.doc
Joint Meeting of the
Golden Valley Planning Commission and Golden Valley Environmental
Commission
January 22, 2007
A joint meeting of the Planning Commission and Environmental Commission was held
at the Golden Valley City Hall, Council Conference Room, 7800 Golden Valley Road,
Golden Valley, Minnesota, on Monday, January 22, 2007. Director of Planning and
Development Mark Grimes called the meeting to order at 6 pm.
Those present were Planning Commissioners Cera, Eck, Kluchka, McCarty and
Schmidgall and Environmental Commissioners Anderson, Baker, Hill, Kaisershot, Pawluk
and St. Clair. Also present was Director of Planning and Development Mark Grimes,
Director of Public Works Jeannine Clancy, City Engineer Jeff Oliver, Environmental
Coordinator Al Lundstrom, Joint Water Commission Consultant Scott Harder and
Administrative Assistant Lisa Wittman. Planning Commissioners Keysser and Waldhauser
were absent. Environmental Commissioner Sipala was absent.
Presentation/Discussion of the Water Supply Plan portion of the
Comprehensive Plan
Harder explained that he has been working with the Joint Water Commission on updating
the Water Supply Plan which is one element of the City's Comprehensive Plan. He
discussed what is going to be in the water supply plan and explained that there is not a lot
of latitude when putting together water supply plans due to Met Council requirements and
State statutes. He stated that the Plan addresses best practices, demand, usage, growth
and supply for the future.
He stated the Environmental Commission has asked about the water usage in the winter
versus the water usage in the summer. On a typical day in January Golden Valley
averages 5 to 6 million gallons of water per day and approximately 7-8 million gallons on
an average day in July which is fairly typical for a built -out community. Another issue the
Environmental Commission asked about is a break down between residential and
commercial water use. He explained that residential use is approximately 75% of the total
water use and commercial and industrial use is about 25%. Hill asked about the
difference between commercial and industrial. Harder said that it is normally the size of
the customer that defines commercial and that industrial customers use a lot more
process related water versus just the regular domestic use of water.
Harder referred to a chart that showed a five year average for the Joint Water
Commission as a whole looking at the average per capita water use which is a measure
that the DNR and the regulators like to look at to see if a community is a water waster or
water conserving type of community. He said that Golden Valley is right at the metro
average for gallons per day per capita.
Harder discussed an overview of the water supply plan itself which is done by the JWC
and includes the cities of Golden Valley, New Hope and Crystal. He explained that since
the JWC is the water purchaser they are responsible for preparing the water supply plan
and submitting the plan for approvals by the various state agencies. He said in terms of
the requirements of the water supply plan it is fairly scripted as to what needs to be
Minutes of the Joint Planning Commission and Environmental Commission Meeting
January 22, 2007
Page 2
included in the plan such as describing the sources, describing water tank storage, how
water is supplied to the end users, population changes and conservation efforts.
He referred to sustainability and stated that some of the things addressed in sustainability
are conservation, climate changes and possible impacts on water supplies, use of fossil
fuels and the impact of carbon footprint which is emissions from businesses, trucks and
well pumps to name a few.
He said another issue regarding the water supply plan is interconnections with
neighboring cities and regional issues such as where people might be moving and where
the natural resources are located in relation. He stated another regional consideration is
the reliability of the Minneapolis water supply system which is why Minneapolis is
pursuing an interconnection with St. Paul which would be able to handle triple the amount
the entire JWC uses on its peak day.
He referred to water conservation best practices and discussed some basic measures
including public education, codes and standards, water waste restrictions and
consumption based metering and billing. Some of the advanced measures include
targeting irrigation systems efficiency, commercial landscape irrigation ordinances, new
home water conservation, ability to restrict lawn watering, residential water efficiency
projects, and municipal building interior and exterior retrofits. He said the measures that
the JWC is considering including in its plan are encouraging irrigation system efficiency,
considering adoption of a model ordinance, commercial landscaping irrigation ordinances,
ability to restrict lawn watering, municipal building interior/exterior retrofits and continuing
with a water conserving rate structure.
Baker asked what typical water conserving rate structures looks like. Harder said there
would be a base charge, $5 for example, then for the first 6 or 8 thousand gallons of
water there is a certain fee per 1,000 gallons and then usage above that would have a
slightly higher rate per 1,000 gallons and there could be a third tier.
McCarty asked what types of things are included in the commercial water use efficiency
projects. Harder said things like low flow fixtures in office park bathrooms. Schmidgall
added that gray water could be used for commercial irrigation.
Kaisershot stated that if 75% of water goes toward residential use why that isn't an area
that the JWC would want to address. Harder said the JWC is trying to avoid issues that
might require some sort of subsidy or the need to go into people's homes. He added that
a lot of conservation issues are automatically addressed as homes are upgraded. Clancy
added that the City is using its available money on an 1/1 program and that conservation
issues are more of an educational opportunity for residents when they do upgrades in
their homes.
Pawluk asked if the City has the ability to restrict lawn watering. Clancy said that Golden
Valley's ordinance at one time was essentially in violation with the JWC contract with
Minneapolis. However it is no longer in violation. She added that one of the goals with this
water supply plan is to have consistency in all three cities.
Minutes of the Joint Planning Commission and Environmental Commission Meeting
January 22, 2007
Page 3
Kaisershot asked if there is a residential educational component in the water supply plan.
Harder said there are things on the City's website, but nothing new is planned.
Pawluk asked if there was a way that water bills could show residents their current rate
versus a rate that they could pay if they were following some of the conservation ideas so
that they could see in dollars what they could be saving. Clancy said she didn't think the
bills could be defined to that level of detail. Kluchka suggested showing an average
household dollar amount instead. Clancy said she thinks the City could possibly show an
average household dollar amount on its bills. She added that she thinks City staff does a
good job in the newsletter writing educational articles on storm water issues, but could
probably do a better job writing about water conservation issues.
Schmidgall asked about 1/1. Clancy explained that 1/1 is inflow and infiltration into the
sanitary sewer system or clear water going into the sanitary sewer system.
Harder referred to a chart that showed 2001 Daily Water Demands and explained water
conserving rate structures and the idea that if cities promote too much conservation the
amount of water sold goes down and the rate goes up. He said that he would like to
encourage people to cut down on their water consumption on peak days because that is
the most expensive water and because plants are built according to the water used on
those peak days. Hill said that people don't necessarily know when the peak days are.
Harder talked about the next steps in the water supply plan. He said that the JWC
Technical Committee will start writing a draft plan then there will be public hearings in
each of the three cities, the JWC will adopt the plan and each city will incorporate it into
their specific Comprehensive Plans. Grimes stated that both the Planning Commission
and the Environmental Commission will see the water supply plan again in the future.
The meeting was adjourned at 6:58 pm.
GOLDEN VALLEY ENVIRONMENTAL COMMISSION
Regular Meeting
Minutes
January 22, 2007
Present: Commissioners Baker; Hill; Pawluk; St. Clair; Anderson; Kaisershot.
Also present were Jeannine Clancy, Director of Public Works; Jeff
Oliver, City Engineer, Al Lundstrom, Environmental Coordinator;
Absent: Commissioner Silpala and Deb Somers, Administrative Assistant
Guest: Scott Harder, Environmental Financial Services
1. Continuation of the Water Supply Plan Meeting
Baker suggested that instead of using unaccountable water and commercial
irrigation system to compile usage on peak days it might be more accurate to use
residential usage. There are several commercial irrigation systems that run
during the afternoon and/or during rainstorms, instead of during evening hours.
St. Clair asked why there is a significant increase in the water usage between the
winter/summer water use and the annual residential/commercial use. Clancy
explained that there have been some changes in the past few years that could be
impacting the amount of the annual water use. These include changing out the
30 -year-old water meters, both residential and commercial, in 2000 and 2001,
General Mills Main Campus converted from well water to city water; all usage for
municipal buildings was not metered; and contractors were not required to meter
their water usage while working on the pavement management project until
recently. Other incremental increases may be from additional housing such as
the Hidden Lakes development, Wesley Commons and other smaller
developments.
If the City chooses to pass an ordinance banning the watering of lawns during
droughts, Hill asked if the ordinance would need to be adopted by Crystal and
New Hope as well. Clancy advised that the JWC contract with the City of
Minneapolis does not request Golden Valley to have its own ordinance; however,
the goal is to have the same ordinances in all three cities.
The Cities of New Hope and Golden Valley have replaced their water meters,
however, Crystal has not yet done so. Baker and Hill asked how the Commission
keeps track of Crystal's usage. The water usage costs are broken down by
consumption.
Harder described the triple bottom line as being financial, environmental and
social. Hill asked what social meant. In this context, social means to take care of
the fixed income and elderly by promoting a water rate that had a lifetime rate so
this group, that doesn't use much water, would receive a lower rate. Golden
Valley has a very low basic consumption rate, and because of this minimal usage
the City does not have a senior rate.
Minutes of the Environmental Commission
January 22, 2007
Page 2 of 3
2. Call to Order
Pawluk called the regular meeting of the Environmental Commission to order at
7:24 pm.
3. Approval of Minutes — November 27, 2007
MOVED by St. Clair, seconded by Baker, and the motion carried unanimously to
approve the minutes of the November 27, 2007 meeting.
4. Proposed 2007 Meeting Dates
Lundstrom presented the proposed Environmental Commission meeting dates
for 2007. It was agreed to accept these dates. Should a meeting date need to be
changed in the future, it will be addressed at that time.
5. Annual Report Due March 1, 2007
Pawluk asked Baker if he had a copy of his notes from the 2006 Annual Report.
Baker does have the notes and he will e-mail a copy to Pawluk. The 2007 Annual
Report is due by March 1, 2007 by all commissions. Attached to the agenda is a
copy of the 2006 report.
Clancy advised Pawluk to let Judy Nally know when he is ready to take the report
to the City Council and Nally will add him to the Council agenda.
6. Program/Proiect Updates
A. 1/1 Inspection Update
Attached is the 1/1 inspection highlights. Oliver reported that the number of
inspections had slowed down in December. Most of the inspections in the 2007
PMP area were completed; however, there are several that the inspector was not
able to gain access or must be reinspected. Letters are being sent to this group
of residents reminding them to address these issues and reschedule
appointments.
Primary inspection issues include connections that staff is unable to identify what
they are and taps with structural problems that need to be reviewed for
infiltration. Response to the inspections has been good, once residents
understand the intent most are quite receptive.
Clancy added that the results of the City Survey showed that fifty percent of
residents did know what inflow and infiltration was, and fifty percent did not.
The survey also showed that even more residents did not know the Metropolitan
Council was surcharging cities for these events.
B. Proposed Developments
1. Miner/Olympic Printing Site — This project is currently on
hold. The Planning Department is waiting for them to resubmit some issues that
the City had on this project.
Minutes of the Environmental Commission
January 22, 2007
Page 3 of 3
2. Colonnade II — The Colonnade II is scheduled to go to the
City Council on February 6, 2007.
Clancy advised that if both the Miner/Olympic Printing and Colonnade II projects
go forward there will also be road work needed on the intersection of Golden Hills
Drive and Xenia Avenue North to add turn lanes.
3. Minneapolis West AUAR — Clancy identified the seven acres
portion of this project that is located in Golden Valley. St. Louis Park and Golden
Valley have agreed that the project will be completed under a joint powers
authority.
Mark Grimes attended a neighborhood meeting on this project. Approximately
one-half of the residents in attendance were from Golden Valley. Clancy
reviewed the additional information the City Planner believes should be gathered
and analyzed for inclusion in the final AUAR.
4. Lighting Ordinance — The Planning Commission is holding a
public hearing tonight.
5. Deer Management Status — The contractor has started
baiting deer. It is unknown the number of deer that have been eliminated, or the
locations where the contractor is working.
7. Commission Member Council Reports
Nothing to report.
8. Other Business
None.
9. Adiourn
MOVED by Baker, seconded by Hill, and the motion carried to adjourn.
The meeting was adjourned at 8:24 pm. The next scheduled meeting will be on
February 26, 2007 at 7:00 pm.
Respectfully submitted,
Debra K. Somers
Administrative Assistant
Department of Public Works
%i.'�%% %% %i'
ATTACHMENT A
SWEENEY LAKE TMDL PROJECT
WORK PLAN
(Revised to include internal loading analysis)
Applicant Information:
Name of Organization: City of Golden Valley, Minnesota
Type of Organization: Municipality
Project Manager: Jeannine Clancy
Contact Information: Public Works Director
City of Golden Valley
7800 Golden Valley Road
Golden Valley, MN 55427
Phone: 763.593.8035
Project Consultant: Ron Leaf
Project Manager
Short Elliott Hendrickson, Inc.
3535 Vadnais Center Drive
St. Paul, MN 55110
Phone: 651.490.2998
Fax: 651.490.2150
Cooperating Agency: Bassett Creek Watershed Management Commission
Project Information:
Project Title:
Sweeney Lake Excess Nutrients TMDL Study
DNR Lake ID#:
27-0035-01
Impairment:
Excess nutrients (swimming)
Affected Use:
Aquatic Recreation
Requested Amount:
$59,400 - includes baseline in -lake loading evaluation.
Total request up to $99,400 which would include
additional monitoring costs in Phase 2. If needed, these
costs could range from $10,000 - $40, 000 above the
$59,400.
Project Dates:
Start May 2006, completion within 20 months after
authorization to proceed (estimated December 2007).
Project Summary
Sweeney Lake is a 2004 "new" listing in the Final EPA -Approved MPCA 2004 CWA
303(d) List of Impaired Waters (2004 303d List). Sweeney Lake is listed for excess
nutrients with a target start and completion schedule of 2009/2012 according to the 2004
Sweeney Lake TMDL Work Plan 1
City of Golden Valley, Minnesota Short Elliott Hendrickson Inc.
303d List. The City of Golden Valley is interested in accelerating the schedule for the
TMDL to be positioned to begin improvement efforts and activities prior to the target
completion date of 2012. By completing the study now, the City also gains the ability to
incorporate implementation projects and activities into other public works projects within
the watershed. The outcome of the project will be to develop a TMDL for Sweeney Lake
in cooperation with the Bassett Creek Water Management Commission.
Project Background
Sweeney Lake is a 67 -acre water body within the City of Golden Valley. Sweeney Lake
has a contributing drainage area of approximately 2,360 acres that is essentially fully -
developed. The watershed boundaries are located primarily in Golden Valley, but also
extend to portions of St. Louis Park. Sweeney Lake has been subject to fairly extensive
previous study including a Watershed and Lake Management Plan completed for the
Bassett Creek Watershed Management Commission (Barr Engineering, 1994) and water
quality monitoring dating back to at least 1977.
The City of Golden Valley is moving ahead with their annual pavement management
program, that serves to repair and upgrade degraded streets and/or utilities throughout the
City. One of the current areas of effort is streets within the Sweeney Lake watershed.
Specifically, the City is currently working through a drainage plan improvement effort
and extensive public input process for the first segment of street reconstruction projects
in the Sweeney Lake watershed. The intent and goal of the drainage study are to identify
locations and types of best management practices (BMPs) that can be installed as part of
the pavement management program and achieve improvements in water quality treatment
in the Sweeney Lake watershed.
Another important consideration of this study is the recent transportation system
improvements by MnDOT along Trunk Highway 100. Recent construction activities
along THIN date back to at least 2001. Because recent water quality data represents
watershed conditions during these extensive construction activities, a portion of this study
effort will incorporate MnDOT construction activities into the analysis and attempt to
quantify/anticipate the longer-term impacts and improvements in Sweeney Lake resulting
from the TH 100 work.
Problem Statement
In 2004, the lake was designated as an "impaired water body" by the Minnesota Pollution
Control Agency for phosphorus based upon its water quality history. Previous work by
the Bassett Creek WMC described in the Sweeney Lake Watershed and Lake
Management Plan (Barr, 1994) identified priorities and guidelines for the Cities of St.
Louis Park and Golden Valley and residents in these cities for meeting BCWMC water
quality goals for Sweeney Lake. Recommendations of the 1994 Plan were established in
two phases: Phase I included shutting the aeration system down and monitoring lake
response along with implementation of several watershed -wide BMPs (i.e., wet detention
Sweeney Lake TMDL Work Plan 2
City of Golden Valley, Minnesota Short Elliott Hendrickson Inc.
basins for new and redevelopment projects; phosphorus fertilizer ban; education efforts;
and ordinance enforcement).
Project Activities and Schedule
The activities covered in this contract involve completing the TMDL for nutrients in
Sweeney Lake. The study will be approached in two phases. Phase one will include
collecting lake sediment core samples to estimate internal loading rates based on lab
determined sediment release rates. These rates and the physical properties of the lake will
be used to estimate internal loading to Sweeny Lake with and without aeration. These
internal loads will be compared to existing loading estimates from other sources and be
used to establish the quantitative relation of internal load to these other sources and to
allocate load reductions as part of the TMDL. In phase one, we will also use the existing
in -lake monitoring data to estimate the temporal trend in—lake phosphorus mass and
identify gaps in the existing data.
Phase two involves focused monitoring to further quantify the most significant source(s)
of phosphorus, attribute the portion of the total in -lake phosphorus mass to their sources,
and monitor the results of implementing TMDL recommendations. The results of phase
one will focus the phase two data collection on the most significant sources. The
sampling plan and data collected in phase two will be used to determine a detailed mass
balance budget of the lake the effectiveness of TMDL allocations.
Quarterly summary reports on the project's progress will be provided to the MPCA
throughout the duration of the project. These reports will include a description of
completed or ongoing tasks and preliminary findings, as well as a budget summary
detailing the amount of money spent on each task during the quarter.
Task I.A. Collect and Assemble Existing Data
The project will use existing data available for Sweeney Lake to the extent the data meets
the quality standards necessary to complete the TMDL. Water quality data for the lake is
currently available from various sources including MPCA and Bassett Creek WMC.
Additional watershed characteristic data is available from the City and Bassett Creek.
These data will be compiled and a summary memorandum describing the extent of data
and any gaps in data will be prepared and provided to the MPCA.
Schedule: Month 1
Budget: $2,700 (24 hours + reimbursable expenses)
Deliverables: Summary memorandum identifying data available and any
gaps/additional data needs necessary to complete the TMDL.
Task I.B. Conduct Internal Loading Analysis
One of the critical steps in this study is to compare the internal loading of the lake with
the aeration system on and off. This scope includes one summer season of monitoring
(April through October) which may allow collection of sufficient data to draw
conclusions on the effects of the aeration system on internal loading to the lake. The
Sweeney Lake TMDL Work Plan 3
City of Golden Valley, Minnesota Short Elliott Hendrickson Inc.
summer season is chosen because temperature and light become the limiting factor of
algae formation during the rest of the year. However, a second year of monitoring may
be necessary if the aeration system is determined to have a significant impact or to offset
unusual climatic effects that impact the quality of data. Specific monitoring parameters
are presented in sub -item 1 below. The Sweeney Lake Watershed and Lake Management
Plan (Barr, 1994) completed for the Bassett Creek WMC, previously recommended that
aeration system be temporarily shut down from April through October for a period of one
to two years and monitored in its natural condition.
The results of this task will provide the basis for an estimate of the internal loading of
phosphorus within the lake. This internal loading is essentially the release of phosphorus
from the lake sediment. In the summer, a thermalcline develops in most lakes such that
the water at the surface of the lake is much warmer and lighter than the water below,
forming a physical barrier separating the two. Sediments and containments carried into a
lake as well as algae and zooplankton die and sink to the bottom of the lake.
Decomposition of these organisms uses oxygen, resulting in a depletion of oxygen at the
bottom of the lake. The thermalcline prevent mixing of the warm oxygen rich water
resulting in a period of time where anaerobic (without oxygen) chemical reactions occur
in the lake sediment interface. These reactions result in larger amounts of phosphorus
being released from the sediment than under aerobic (with oxygen) conditions. In some
lakes with high internal loading, the concentration of phosphorus in the water below the
thermoclie can build to a point that the water can not hold any more dissolved
phosphorus and the chemical concentration gradient become the controlling factor and
overrides the sediment water interface release rates. Based on the Lake Management
Plan, determining if this occurs in Sweeney Lake is an important portion of this study.
Depending on if this concentration gradient forms and the release rates determined in this
proposed work, the aeration system could be causing mixing of the lake and allowing for
a higher annual phosphorus release than without aeration.
Estimates of internal loading under natural conditions will be made based on the number
of days the lake bottom is anoxic (without oxygen) and aerobic (with oxygen). An
estimate of internal loading during aeration will be made by assuming the aeration system
is adequate to keep a thermalcline from developing, and thus loading will be based on
fully aerobic conditions. Sediment release rates will be determined in the lab.
1. In -Lake Data Collection
A multi -parameter probe (HydroLab or comparable instrument) will be used to determine
profiles of the dissolved oxygen, temperature, and pH at two locations within the lake,
one location in each of the north and south deeper basins. Monitoring will be conducted
on a biweekly basis for a period of up to 14 weeks starting in mid-to-late April and
ending in October.
Monthly dissolved phosphorus samples will be collected near the lake sediment interface
and at discrete intervals in the water column. For this scope we have estimated that 40
samples will be taken (4 each month at each of the two monitoring locations for 5
Sweeney Lake TMDL Work Plan 4
City of Golden Valley, Minnesota Short Elliott Hendrickson Inc.
months). Samples will be sent to a lab for analysis. Care must be taken during sample
collection to avoid stirring of sediments on bottom samples and in obtaining the exact
interval required; therefore, sampling will be completed by staff experienced in these
sampling methods. Water column samples will be used to calculate the total in -lake mass
increase of phosporus. Bottom samples will be used to insure that the sediment interface
release is controlling the sediment release rate and not the chemical concentration.
2. Sediment/Core Samples of Lake Sediments
Attachment B describes the subcontractors work plan and cost estimate to complete the
sediment coring work.
3. Groundwater Study
Groundwater contributions will be estimated based on the Golden Valley Groundwater
Study completed by Barr Engineering.
4. Phosphorus Loading Analysis
Surface water runoff loading to Sweeny Lake will be calculated based on existing data.
SEH will evaluate internal loading from the lake bottom samples using sediment release
rates, lake profile data, the bathometric lake map, and sample data. Lake profile data
collected in the field will be used to determine the time period(s) the lake is anoxic below
the thermalcline. The bathometric mapping will be used to create a depth/area
relationship for the lake. These data will then be used to determine the area of anoxic
release (area below thermalcline) and the area of aerobic release (area above
thermalcline). The lake water quality samples will be used to determine if the phosphorus
sediment release rates are controlled by the water sediment interface or the phosphorus
concentration gradient. Sediment release rates based on the appropriate condition
throughout the summer season will be determined and applied and the internal load
calculated.
In -lake samples will be used to calculate the change in total mass of phosphorus in the
lake. A mass balance calculation will be done to compare the mass increase to the
estimated internal load, groundwater influx, and surface water influx (as estimated by the
monitoring of the inlet to Sweeney Lake by the City). A large difference in these numbers
would indicate significant sources of phosphorus were missed and result in the need for
more detailed monitoring in Phase 2, while a balanced mass calculation will confirm the
significance of the measured loading to Sweeny Lake.
Additional analysis will be preformed to compare the natural condition to an aerated
condition. Based on the assumption that the aerator is sufficiently sized to keep the lake
completely mixed throughout the summer, the estimated internal load with aeration will
be calculated using the sediment release rate for fully aerated conditions. This assumption
will contrast the loading of the lake in a natural state to that of the aerated state. If the
load during aeration is significantly higher, additional study may need to be made on the
Sweeney ake TMDL Work Plan 5
City of Golden Valley, Minnesota Short Elliott Hendrickson Inc.
aeration system and its ability to keep the lake from stratifying as the scenario where the
aeration system does not keep the lake stratified all summer could result in a even higher
load that either of these aforementioned. Additionally, if the estimated loading does not
match the measured in -lake mass increase in the mass balance analysis, additional
evaluation of other sources such will need to be explored in phase two. This potential
additional future work will be evaluated during the study and included in task 4
recommendations.
Schedule: Months 2 - 6
Budget: $17,400 (162 hours + reimbursable expenses); 1.B.1
$8,000 Sediment Core Sampling Subcontract; 1.B.2
$9,000 (82 hours + reimbursable expenses); 1.B.3
Deliverables: Summary memorandum identifying data available and any
gaps/additional data needs necessary to complete the TMDL.
Potential monitoring in Phase 2 could include a whole lake monitoring study including
the inflow, outflow and groundwater. These could include but are not limited to the
following:
• Continuous flow monitoring and water quality sampling of inlet
• Continuous flow monitoring and water quality sampling of outlet
• Monitoring of atmospheric deposition
• Investigation into illicit discharge such as industry or illegal septic
• Continuous flow monitoring, water quality sampling of connection to Twin Lake
This Phase 2 monitoring may or may not be warranted, based on the findings of the first
year analyses. Following an evaluation of the first year data, a determination of the need
for more detail Phase 2 monitoring and refinement of the cost for these efforts will be
completed. At this time, our best estimate of a cost range is between $10,000 and $40,000
to complete the additional analyses.
Task 2. Public Involvement Process
The City will incorporate the TMDL study plan and goals into a public involvement
effort. The focus of the public involvement efforts will be to revisit water quality goals
currently in-place for Sweeney Lake and introduce programs and treatment options
available to address the recommendations of the TMDL. One of the key issues to be
discussed at the public meeting will be the need to turn off the aerators for one summer to
monitor the water quality and internal loading without the systems in operation. Task 2
involves preparation of meeting materials (poster boards, hand-outs, comment forms,
etc.) and staff effort to prepare these materials and to attend the two public meetings. The
first meeting is anticipated to inform residents of the study components and the second
meeting to focus on stud results and possible implementation activities. The budget
reflected below assumes that meetings are held separate from any other possible public
meetings for projects in the area.
Schedule: Months 2 and 6 (estimated)
Sweeney Lake TMDL Work Plan 6
City of Golden Valley, Minnesota Short Elliott Hendrickson Inc.
Budget: $8,000 (68 hours + reimbursable expenses)
Deliverables: Prepare materials for and attend 2 public meetings; prepare public
involvement section of final TMDL report.
Task 3. Develop Details of Implementation Plan
With the previous results of the Sweeney Lake Watershed and Lake Management Plan,
results of the internal loading analysis and additional public input in hand, details of what
will be done to reduce the nutrient/pollutant loads will be developed. This effort will
produce recommendation for when specific activities should be done, and who will do
each respective activity or project. Cost estimates for budgeting purposes will also be
developed.
Schedule: Months 3-8
Budget: $7,400 (60 hours + reimbursable expenses)
Deliverables: Detailed implementation plan for addressing the "excess nutrients"
leading to impairment.
Task 4. Prepare Recommended Monitoring Plan
Recommend a monitoring plan to document progress toward achieving the load reduction
and goal achievement identified in the TMDL program.
Schedule: Month 7 (or delayed until year 2)
Budget: $800 (6 hours + reimbursable expenses)
Deliverables: Monitoring plan
Task 5. Prepare Draft TMDL Report in Proper State and Federal Format
A draft TMDL report will be submitted to MPCA to meet the critical documentation
needs of MPCA. The following outline will be used as the basis for the draft report:
• Executive summary
• Problem statement
• Numeric targets
• Lake characterization and source assessment
• Modeling approach and application
• TMDL and allocation scenarios
• Follow-up monitoring plan recommendations
• Public participation/involvement
• Detailed implementation plan
Included in this task effort is a meeting between City staff and MPCA to review the
finding and recommendations of the draft report prior to submitting the report as a final.
This work plan assumes one meeting at MPCA or City offices, with Bassett Creek WMC
representatives invited to participate in the meeting.
Schedule: Month 8
Budget: $5,600 (48 hours + reimbursable expenses)
Sweeney Lake TMDL Work Plan 7
City of Golden Valley, Minnesota Short Elliott Hendrickson Inc.
Deliverables: 8 printed copies of draft TMDL report; 4 copies to MPCA, 1 to
Bassett Creek, 3 to City.
Task 6. Prepare Final TMDL Report
Based on comments and edits from Task 5, a final report will be submitted to MPCA.
Schedule: Month 9 unless delayed by need for phase 2
Budget: $2,400 (16 hours + reimbursable expenses)
Deliverables: 8 printed copies of final TMDL report; 4 to MPCA, 1 to Bassett
Creek, 3 to City (8 CD/electronic copies will also be prepared).
Table 1. Task -Budget Summary
Task
Estimated
Hours
Cost
(including
expenses*)
1.A. Collect/Assemble Existing Data
24
$2,700
1.B. Internal Loading Analysis
Admin.
1A
1. In -Lake Data Collection
162
**$17,400
2. Sediment Core Sampling Subcontract
NA
$8,000
3. Phosphorus Loading Analysis
82
$9,000
2. Public Involvement Process
68
$7,900
3. Develop Details of Implementation Plan
60
$6,500
4. Prepare Recommended Monitoring Plan
6
$600
5. Draft TMDL Report
48
$5,200
6. Prepare Final TMDL
16
$2,100
Totals
446
$59,400 to
$99,400**
* Reimbursables (mileage, reproductions, monitoring equipment and lab analysis fees.
** Additional $10,000 to $40,000 MAY be needed to sample/monitor inlets/outlets in Phase 2.
Table 2. Task -Hour Summary
Task
Staff Category and Estimated Hours
PM
(R. Leaf)
PE
(B. Lenz)
EIT
(S. Severa)
WQS (D.
Deuschle)
Admin.
1A
4
4
12
4
1131
16
66
80
163
2
68
12
2
12
20
20
12
4
3
8
20
16
16
4
2
2
2
5
6
16
12
8
6
Sweeney Lake TMDL Work Plan 8
City of Golden Valley, Minnesota Short Elliott Hendrickson Inc.
6
4
4
2
4
2
Total Hours
36
148
130
138
12
Sweeney Lake TMDL Work Plan 9
City of Golden Valley, Minnesota Short Elliott Hendrickson Inc.
ATTACHMENT B
Internal P loading Analysis
ERDC Eau Galle Aquatic Ecology Laboratory
3/1/2006
The overall objectives of this investigation are to examine internal phosphorus flux from
sediments under oxic and anoxic conditions.
Approach
Internal loading of phosphorus from sediments will be determined at 1 station (to be
selected) using sediment core incubation techniques (James and Barko 1991). A Wildco
KB Sediment Core Sampler (Wildco Wildlife Supply Co.), equipped with an acrylic core
liner (6.5 -cm ID and 50 -cm length), will be used to collect intact sediment cores
(undisturbed) at each station. The core liners, containing both sediment and overlying
water, will be immediately sealed using stoppers and stored in a protective box until
analysis. Additional lake water will be collected for later incubation with the collected
sediment. Six cores will be collected at the station; Three cores will serve as replicates for
determination of P release under oxygenated conditions while the other three will be
subjected to anoxic conditions.
In the laboratory, the cores will be carefully drained of overlying water and the upper
10 cm of sediment will be immediately transferred intact to a smaller acrylic core liner
(6.5 -cm dia and 20 -cm ht) using a core remover tool. Lake water will be filtered through
a glass fiber filter (Gelman A-E), with 300 mL then siphoned onto the sediment
contained in the small acrylic core liner without causing sediment resuspension. Sediment
incubation systems will, therefore, consist of the upper 10 -cm of sediment and filtered
overlying water contained in acrylic core liners that are sealed with rubber stoppers. The
sediment incubation systems will be placed in a darkened environmental chamber and
incubated at a constant temperature for up to 3 weeks. The incubation temperature (to be
determined later) will be set to a standard temperature for all stations for comparative
purposes. The oxidation-reduction environment in each system will be controlled by
gently bubbling either air (oxic) or nitrogen (anoxic) through an air stone placed just
above the sediment surface. Bubbling action will insure complete mixing of the water
column but will not disrupt the sediment.
Water samples for soluble reactive phosphorus (SRP) will be collected from the center of
each sediment incubation system using an acid -washed syringe and immediately filtered
through a 0.45 µm membrane syringe filter (Nalge). The water volume removed from
each system during sampling will be replaced by addition of filtered lake water
preadjusted to the proper oxidation-reduction condition. These volumes will be
accurately measured for determination of dilution effects. SRP will be measured
colorimetrically using the ascorbic acid method (APHA 1998). Sampling will be
conducted at daily intervals for 5 days, then every other day for an additional 14 days.
Rates of SRP release from the sediment (mg m-2 d-1) will be calculated as the linear
Sweeney Lake TMDL Work Plan 10
City of Golden Valley, Minnesota Short Elliott Hendrickson Inc.
change in concentration in the overlying water divided by time and the area of the
incubation core liner. Interpretation of results and summary will be provided at the end of
the study.
Estimated Cost
1) Travel and labor for collection and setup of sediment cores $2,500
2) Expenses for sediment core incubation and chemical analyses $4,700
($450 per incubation system)
3) Data analysis and interpretive report $800
Total cost for this project $8,000
Product: A letter report describing rates of P release under different laboratory
conditions.
X:\FJ\Goldv\050300\TMDL Study\ATTACHMENT A - SWEENEY 2-11-06.doc
Sweeney Lake TMDL Work Plan 11
City of Golden Valley, Minnesota Short Elliott Hendrickson Inc.
Page 1 of 1
Clancy, Jeannine
From: Ron Leaf [rleaf@sehinc.com]
Sent: Thursday, April 13, 2006 8:24 AM
To: Timothy. Larson@state.mn. us
Cc: Clancy, Jeannine; Ikremer@barr.com; Bernard Lenz
Subject: Sweeney Lake TMDL Study - Revised Workplan
Attachments: ATTACHMENT A - SWEENEY 4-7-06.doc
Tim,
Thanks for the call back regarding Sweeney Lake. Unfortunately our schedules have not allowed us to connect directly. The
attached revised workplan for Sweeney is a result of further discussions with the key project partners (the City and Bassett Creek
WMC).
The main change, as I mentioned in my voice message to you, is the internal loading analysis which will greatly improve the
quality of the findings and, therefore, the quality of the implementation program. This obviously adds some cost to the effort and
also extends the schedule through 2007 to include two years of monitoring/sampling efforts - with and without the aerators
running. We have revised the workplan to account for a baseline internal loading analysis and provisions for a more detailed effort
pending the results of the first year analysis. The total cost is stated in the revised work plan as a minimum of $59,400 (baseline)
and up to $99,400 (more detailed). We have much less confidence in the need for (and the level of effort needed to complete)
the more detailed study at this time so we have stated it as a range form $10,000 to $40,000.
Based on your message, we understand that MPCA has allocated $22,000 (of the original $25,000 requested) for the Sweeney
Lake study (without the internal loading analysis). We also understand that you may not be able to find additional funds for
revised workplan this year. We would like to understand more clearly what the ability MPCA has to allocate additional fun(
2006 and/or 2007 for the revised workplan.
I am out of the office most of the day today and Friday - but please try my cell phone if you have time.
Thanks
Ron
Ron Leaf
651.765.2998 direct
612.201.0876 cell
651.490.2150 fax
rleaf@sehinc.com
www.sehinc.com
04/19/2006