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Black Dog Watershed Management Commission

Revised Agenda

Wednesday, March 19, 2014 5:00 P.M.

BURNSVILLE MAINTENANCE FACILITY

Conference Room (13713 Frontier Court, Burnsville MN 55337)

COMMISSIONERS: Roger Baldwin (Chair) Greg Helms (Alt.) Mary Hamann-Roland (Vice-Chair) Tom Harmening Mike Hughes (Alt.) Loren Knott Scott Thureen (Secretary/Treasurer) Tom Goodwin (Alt.)

I. Approval of Agenda

II. Approval of Minutes – February 19, 2014

III. Approve Accounts Payable

IV. Review of Budget Performance Reports

V. Overview of 2013 Lac Lavon Water Quality Monitoring Report

VI. Discuss Potential Funding Mechanism for Internal Load Projects

VII. Miscellaneous

VIII. Adjournment

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * The City of Burnsville and Black Dog Watershed Management Organization do not discriminate on the basis of race, color, national origin, sex, religion, age, or disability in the admission or access to, or treatment or employment in, its programs, activities, or services. To obtain this information in alternative forms such as braille, large print, audiotape or qualified readers, please contact the City of Burnsville. Telephone (952) 895-4400, TDD (952) 895-4567.

Black Dog Watershed Management Commission

Agenda Background

March 19, 2014 1. Approval of Agenda

Agenda enclosed. Action Requested: A motion be considered to approve the Agenda.

2. Consider Approval of Minutes from the February 19, 2014 Meeting

Minutes enclosed. Action Requested: A motion be considered to approve the Minutes of the February 19, 2014 meeting

3. Consider Approving Accounts Payable

Accounts payable list enclosed. Action Requested: A motion be considered to approve the accounts payable list as submitted by staff. 4. Review of Budget Performance Reports

Current Budget Performance Reports enclosed. Action Requested: No formal action required.

5. Overview of 2013 Lac Lavon Water Quality Monitoring Report

In 2013 Barr Engineering performed increased monitoring on Lac Lavon. Karen Chandler from Barr Engineering will go over the monitoring performed and the results of the monitoring at the meeting. Enclosed in your packet is a technical memo from Barr.

Action requested: The Commission consider a motion accepting the report with any edits suggested at the meeting.

6. Discuss Potential Funding Mechanism for Internal Load Projects

In the current joint powers agreement for the Black Dog WMO staff identified two options for raising the necessary funds for the internal load treatment at Keller Lake. One method would be to increase member contributions using the current formula for membership dues. The other would divide up the cost of the project based on the tax valuation of the benefited communities, Apple Valley, Burnsville, and Lakeville. Enclosed in your packet is a spreadsheet outlining both funding scenarios. At the meeting staff will go over these sheets in detail with the commissioners

Action Requested: The Commission considers the funding options presented and make a recommendation to staff on how to proceed with the 2015 budget preparations.

7. Miscellaneous

.

BLACK DOG WATERSHED MANAGEMENT COMMISSION

“Draft” Minutes of February 19, 2014

MEMBERS PRESENT MEMBERS ABSENT Roger Baldwin (Chair) Tom Harmening Mary Hamann-Roland (Vice-Chair) Scott Thureen (Secretary/Treasurer) Mike Hughes (Alt) Loren Knott

Greg Helms (Alt) Tom Goodwin (Alt)

OTHERS PRESENT Roger Knutson - Commission Attorney Karen Chandler – Barr Engineering Jane Byron – City of Apple Valley Staff Jessica Vanderwerff – Dakota County SWCD Ann Messerschmidt – City of Lakeville Staff Daryl Jacobson – BDWMO Administrator Vickie Martin – BDWMO Secretary Roger Baldwin, Chair, called the February 19th meeting to order at 5:00 pm at the Burnsville Maintenance Facility.

1. Approval of Agenda Motion by Hamann-Roland, second by Hughes, to approve the Agenda as presented Ayes – Baldwin, Hamann-Roland, Hughes Nays – None Motion carried unanimously

2. Approval of Minutes from the January 16, 2014 Meeting

Motion by Hughes, second by Baldwin, to approve the January 16, 2014 Minutes as presented Ayes – Baldwin, Hamann-Roland, Hughes Nays – None Motion carried unanimously

Black Dog Watershed Management Meeting 02-19-2014

3. Approve Accounts Payable Motion by Hughes, second by Hamann-Roland, to approve payment to Campbell Knutson in the amount of $526.50 for legal consulting services, Barr Engineering in the amount of $5,268.62 for engineering consulting, and Dakota County SWCD in the amount of $1,320.00 for website maintenance and Blue Thumb program expenses. Ayes – Baldwin, Hamann-Roland, Hughes Nays – None Motion carried unanimously

4. Review Budget Performance Reports Daryl Jacobson reported the following:

• The fund has a healthy balance. • The audit has not been completed yet. • All the bills are paid through 2013.

5. Review Letters of Interest and Approve Engineering Services Consultant The BDWMO Joint Powers Agreement requires that the Commission solicit proposals for engineering services every two years. Staff only received one letter of interest for providing engineering services, Barr Engineering. Motion by Hamann-Roland, second by Hughes, to approve retention of Barr Engineering as engineering consultants to BDWMO for the next two years Ayes – Baldwin, Hamann-Roland, Hughes Nays – None Motion carried unanimously

6. Review Letter of Interest and Approve Legal Services Consultant The BDWMO Joint Powers Agreement requires that the Commission solicit proposals for legal services every two years. Staff only received one letter of interest for providing legal services, Campbell Knutson. Motion by Hamann-Roland, second by Hughes, to approve retention of Campbell Knutson as legal consultants to BDWMO for the next two years Ayes – Baldwin, Hamann-Roland, Hughes Nays – None Motion carried unanimously

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7. Review Letter of Interest and Approve Auditing Services Consultant The BDWMO Joint Powers Agreement requires that the Commission solicit proposals for auditing services every two years. Staff only received one letter of interest for providing auditing service, MMKR. Motion by Hamann-Roland, second by Hughes, to approve retention of MMKR as auditing consultants to BDWMO for the next two years Ayes – Baldwin, Hamann-Roland, Hughes Nays – None Motion carried unanimously

8. Approve Lakes to Enroll in 2014 Metropolitan Council CAMP Enclosed for the Commissioners was a memo regarding the 2014 Metropolitan Council Citizens Assisted Monitoring Program (CAMP). The memo proposes that the BDWMO sponsor monitoring at the five strategic water bodies identified in the Watershed Plan. This approach is consistent with what has occurred in past years, as well as, the 2014 Annual Work Plan and Budget Motion by Hamann-Roland, second by Hughes, to approve Crystal Lake, Keller Lake, Kingsley Lake, Orchard Lake, and Lac Lavon Lake to enroll in 2014 Metropolitan Council CAMP as planned Ayes – Baldwin, Hamann-Roland, Hughes Nays – None Motion carried unanimously

9. Review Draft 2013 Annual Newsletter Revisions include:

• Orchard Lake story timeline revision (p. 2) • Water Quality Monitoring Program won’t include total phosphorus data. • Add educational story regarding the effects of releasing Koi fish into Keller Lake.

Motion by Hughes, second by Hamann-Roland, to approve the Annual Newsletter for distribution contingent upon any noted revisions. Ayes – Baldwin, Hamann-Roland, Hughes Nays – None Motion carried unanimously

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10. Miscellaneous

• Daryl Jacobson stated he would be participating in a presentation on the State of the Waters. • Proposed a discussion on Internal Loading project and budget at the next scheduled meeting,

tentatively scheduled for March 19, 2014 - 5 pm at the Burnsville Maintenance Facility.

11. Adjournment

Motion by Hamann-Roland, second by Hughes, to adjourn the February 19, 2014 meeting at 5:34 pm Ayes – Baldwin, Hamann-Roland, Hughes Nays – None Motion carried unanimously

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BLACK DOG WMOCASH ACTIVITY REPORT 2014

Expenditures:Monthly General Water Project

Check Cash Engineering Special Legal Admin Public Quality Conf Reserve Contin-Date Description Deposits Check # Amount Balance Support Projects Insurance & Audit Support Education Monitoring Public Fund gency

Balance as of 12/31/13 269,863.83

15-Jan Campbell Knutson (2013) 1557 263.50 263.50 15-Jan Barr Engineering Co (2013) 1558 6,751.26 2,952.26 - 3,799.00 15-Jan Roger Baldwin/ conference (2013) 1559 253.00 253.00 15-Jan Metropolitan Council (2013) 1560 2,750.00 2,750.00 31-Jan Interest Income 3.72

01/31/14 Balance 3.72 10,017.76 259,849.79 2,952.26 - - 263.50 - - 6,549.00 253.00 - -

19-Feb Campbell Knutson (2013: $170) 1561 526.50 526.50 19-Feb Barr Engineering Co (2013: $1,594) 1562 5,268.62 2,795.12 231.00 879.50 1,363.00 15-Jan Dakota County Soil & Water (2013) 1563 1,320.00 1,000.00 320.00 28-Feb Interest Income 3.13

02/28/14 Balance 3.13 7,115.12 252,737.80 2,795.12 1,231.00 - 526.50 - 1,199.50 1,363.00 - - -

Total Revenue 6.85 Total Expense 17,132.88 5,747.38 1,231.00 - 790.00 - 1,199.50 7,912.00 253.00 - -

Less: 2013 A/R 0.00 Less: 2013 A/P (13,101.76) (2,952.26) (1,231.00) - (433.50) - (320.00) (7,912.00) (253.00) - -

Total YTD 2014 Revenue 6.85 Total YTD 2014 Exp 4,031.12 2,795.12 - - 356.50 - 879.50 - - - -

2014 Budget 135,000.00 33,000.00 31,700.00 3,000.00 8,400.00 13,500.00 16,900.00 13,150.00 500.00 9,850.00 5,000.00

Budget Remaining 130,969.00 30,205.00 31,700.00 3,000.00 8,043.50 13,500.00 16,020.50 13,150.00 500.00 9,850.00 5,000.00

MONTH YEAR TO DATE

Opening Fund Balance 256,762 $ 256,762

REVENUES :Member Contributions:

City of Apple Valley $ - $ - $ 11,461 $ - $ (11,461) City of Burnsville - - 101,431 - (101,431) City of Eagan - - 621 - (621) City of Lakeville - - 21,488 - (21,488)

Total Member Contributions - - 135,000 - (135,000)

Other Revenues:Interest $ 3 $ - $ 100 $ 7 $ (93) Contributions (Dakota County) - - - - - Grant (Metropolitan Council) - - - - - TMDL Project - - - - -

Total Other Revenue 3 - 100 7 (93)

Total Revenues $ 3 $ - $ 135,100 $ 7 $ (135,093)

EXPENDITURES :General Engineering Support $ 2,795 $ - $ 33,000 $ 2,795 $ 30,205 Special Projects - - 31,700 - 31,700 Insurance - - 3,000 - 3,000 Legal and Audit 357 - 8,400 357 8,044 Administrative Support - - 13,500 - 13,500 Public Education 880 - 16,900 880 16,021 Water Quality Monitoring - - 13,150 - 13,150 Conference/Publications - - 500 - 500 Project Reserve Fund - 9,850 - 9,850 Contingency - - 5,000 - 5,000

Total Expenditures 4,031 - 135,000 4,031 130,969

EXCESS OF REVENUESOVER EXPENDITURES (4,028) - 100 (4,024)

EXCESS OF REVENUES OVER EXPENDITURES PLUS OPENING FUND BALANCE 252,738

TOTAL CASH AVAILABLE 2/28/2014 252,738

Fund Balance 2/28/2014 252,738$

BLACK DOG WATER MANAGEMENT COMMISSIONBudget Performance Report

February 28, 2014

CURRENT

VARIANCEFAVORABLE

(UNFAVORABLE)ACTUAL

ALLOCATIONSCARRIED

FORWARD BUDGET ACTUAL

MONTH YEAR TO DATE

Opening Fund Balance 208,776 $ 208,776

REVENUES :Member Contributions:

City of Apple Valley $ - $ - $ 11,520 $ 11,520 $ - City of Burnsville - - 101,346 101,346 - City of Eagan - - 619 619 - City of Lakeville - - 21,515 21,515 -

Total Member Contributions - - 135,000 135,000 -

Other Revenues:Interest $ - $ - $ 100 $ 34 $ (66) Contributions (Dakota County) - - - 0 - Grant (Metropolitan Council) - - - 0 - TMDL Project - - - 0 -

Total Other Revenue - - 100 34 (66)

Total Revenues $ - $ - $ 135,100 $ 135,034 $ (66)

EXPENDITURES :General Engineering Support $ - $ - $ 33,000 $ 26,658 $ 6,342 Special Projects 1,231 - 25,200 24,853 347 Insurance - - 3,000 2,306 694 Legal and Audit 170 - 8,400 6,419 1,981 Administrative Support - - 13,500 0 13,500 Public Education 320 - 15,700 15,551 149 Water Quality Monitoring 1,363 - 13,150 11,007 2,143 Conference/Publications - - 500 253 247 Project Reserve Fund - 17,550 0 17,550 Contingency - - 5,000 0 5,000

Total Expenditures 3,084 - 135,000 87,048 47,952

EXCESS OF REVENUESOVER EXPENDITURES (3,084) - 100 47,986

EXCESS OF REVENUES OVER EXPENDITURES PLUS OPENING FUND BALANCE 256,762

TOTAL CASH AVAILABLE 12/31/2013 269,864 Total 2013 Accounts Payable Pd in 2014 (13,102)

Fund Balance 12/31/2013 256,762$

BLACK DOG WATER MANAGEMENT COMMISSIONBudget Performance Report

December 31, 2013

CURRENT

unaudited balance as of 02/28/2014

VARIANCEFAVORABLE

(UNFAVORABLE)ACTUAL

ALLOCATIONSCARRIED

FORWARD BUDGET ACTUAL

Lac Lavon Water Quality Assessment

Prepared for

Black Dog Watershed Management Organization March 2014

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Lac Lavon Water Quality Assessment

March 2014

Table of Contents

1.0 Introduction ............................................................................................................................................ 1

1.1 Characteristics of Lac Lavon ...................................................................................................... 1

1.2 Water Quality Goals ................................................................................................................... 1

2.0 Lac Lavon Monitoring Activities ........................................................................................................... 2

2.1 Water Quality Monitoring ........................................................................................................... 2

2.1.1 Secchi Disc Transparency .............................................................................................. 2

2.1.2 Chlorophyll a ................................................................................................................. 7

2.1.3 Total Phosphorus ......................................................................................................... 10

2.3 Aquatic Macrophyte Surveys .................................................................................................... 13

3.0 Conclusions and Recommendations .................................................................................................... 14

3.1 Conclusions ............................................................................................................................... 14

3.1.1 Water Quality ............................................................................................................... 14

3.1.2 Aquatic Macrophytes ................................................................................................... 14

3.2 Recommended Monitoring for Lac Lavon ................................................................................ 14

3.2.1 Continued Water Quality Monitoring .......................................................................... 14

3.2.2 Macrophyte Surveys .................................................................................................... 15

3.2.3 Lake Levels .................................................................................................................. 15

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List of Figures

Figure 1 Lac Lavon 2013 Water Quality Monitoring Locations ...................................................... 4

Figure 2 Lac Lavon 2013 Secchi Disc Transparency ...................................................................... 5

Figure 3 Lac Lavon Lake (Apple Valley and Burnsville) Summer Average Water Clarity and Trend Analysis .................................................................................................................. 6

Figure 4 Lac Lavon 2013 Chlorophyll a Concentrations ................................................................. 8

Figure 5 Lac Lavon Lake (Apple Valley and Burnsville) Summer Average Chlorophyll a Concentrations and Trend Analysis ................................................................................... 9

Figure 6 Lac Lavon 2013 Total Phosphorus Concentrations ......................................................... 11

Figure 7 Lac Lavon Lake (Apple Valley and Burnsville) Summer Average Total Phosphorus Concentrations and Trend Analysis ................................................................................. 12

Figure 9 Lac Lavon Surface Water Elevations .............................................................................. 16

List of Appendices

Appendix A 2013 Lac Lavon Water Quality Monitoring Data (Barr Engineering) Appendix B 2013 Lac Lavon Aquatic Macrophyte Surveys (Barr Engineering)

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1.0 Introduction

1.1 Characteristics of Lac Lavon

Lac Lavon lies on the Burnsville/Apple Valley border and its 184-acre watershed encompasses

portions of both Burnsville and Apple Valley. The only surface water outlet from Lac Lavon is a

12-inch diameter emergency overflow outlet to Keller Lake. A valve controls the flows in the

overflow pipe; normally the valve is closed. Lac Lavon is unique in that it is an abandoned gravel pit

and therefore not a DNR public water. The lake’s primary water source is groundwater. Lac Lavon’s

water surface area is approximately 60 acres, with 65 percent of the lake less than 15 feet

(4.6 meters) deep and a maximum depth of 32 feet (9.8 meters).

Existing watershed land use is low density residential and park. Two city parks—a City of Burnsville

park on the west shore, and a City of Apple Valley park with a path to a fishing pier on the northeast

shore—are located on Lac Lavon. Very little, if any, change in density is expected in the Lac Lavon

watershed.

Lac Lavon is used for a variety of recreational purposes, including fishing, swimming, aesthetic

viewing, and wildlife habitat. The City of Burnsville public beach and the City of Apple Valley park

with fishing pier provide for most of the recreational use of the lake. However, there is no public boat

access on Lac Lavon.

1.2 Water Quality Goals

The Black Dog Watershed Management Organization (BDWMO) has classified Lac Lavon as a

Category I water body (supporting swimming and other direct contact recreational activities) . The

water quality action level for summer average Secchi disc transparency (SDT) for Lac Lavon in 2013

is 3.55 meters (11.6 feet). When a statistical trend analysis indicates that water transparency has

degraded beyond this level (i.e. SDT less than 3.6 meters), then a diagnostic study of potential causes

is recommended according to the BDWMO’s 2002 Watershed Management Plan. The summer

average SDT in 2013 was 3.6 meters, which is better than the action level of 3.55 meters.

Additionally, there was no statistically significant trend in summer average SDT for the current 10

year period. Based on results of 2013 water quality monitoring of Lac Lavon, a diagnostic study of

Lac Lavon is not required.


2.0 Lac Lavon Monitoring Activities

2.1 Water Quality Monitoring

Lac Lavon has been monitored regularly from 2002 through 2013 with the measurement of Secchi

disc transparency (SDT), chlorophyll a, and total phosphorus at the lake surface. Monitoring was

conducted through the Metropolitan Council’s Citizen Assisted Monitoring Program (CAMP).

Sporadic monitoring was also conducted from 1989 through 2001. In addition to monitoring of water

quality parameters, aquatic macrophyte surveys and fish surveys have been conducted by the

Minnesota Department of Natural Resources (DNR). The 2012 BDWMO Watershed Management

Plan calls for management-level monitoring of Lac Lavon every three years. On behalf of the

BDWMO, Barr Engineering Co. (Barr) collected additional water quality data in 2008, 2010, and

2013. In 2013, Barr collected water samples from the 0-2 meter depth interval in the Main Basin of

Lac Lavon and sent the samples to Braun Intertec Laboratories for analyses of chlorophyll a, total

phosphorus, and dissolved phosphorus. Additionally, Barr collected total and dissolved phosphorus

samples at 1-meter depth intervals from 3 meters to near bottom. A field probe measured

temperature, specific conductivity, dissolved oxygen, pH, and chlorophyll a at 1-meter depth

intervals.

Historically, the BDWMO had calculated the summer average using measurements collected from

the last week of May through the first week of September. The BDWMO Watershed Management

Plan was updated in 2013, and the summer averaging period was changed to June 1 through

September 30 to match the Minnesota Pollution Control Agency’s summer averaging period for lake

water quality. Late May data are still included in calculating summer averages for years prior to

2002, as fewer measurements were available in some years.

2.1.1 Secchi Disc Transparency

Barr collected SDT from three locations in Lac Lavon in 2013: the “Main Basin,” the “Northeast

Basin,” and the “Northwest Basin” (Figure 1). During all sampling events the SDT at the three

monitoring locations exhibited a similar seasonal pattern – the lowest water clarity occurred at the

beginning of the season, with clarity increasing to the highest levels in July, and then decreasing

again in late summer (Figure 2). SDT values measured by the CAMP volunteer were generally higher

than those measured by Barr staff. SDT readings are dependent on a number of factors, including the

individual’s eye sight, measurement techniques, and time of day; therefore, small differences

between SDT measurements are not unexpected.


The summer average SDT was calculated for years where data was available (Figure 3). The

summer-average SDT has fluctuated between 3.1 and 5.2 meters since monitoring began in 1989.

However, it should be noted that the highest summer average SDT of 5.2 meters in 2001 is based on

only two measurements taken in late May and mid-July. Late May to mid-July is often the period of

the year when Lac Lavon has the highest water clarity of the season, so SDT in 2001 is biased

towards a period of the season with higher water clarity compared with other years.

The 2013 summer average SDT was 3.6 meters (11.9 feet). The lowest summer average SDT of

3.1 meters occurred in 2008, while one of the years of highest SDT occurred just three years prior in

2005, demonstrating the season to season variability of water quality in Lac Lavon. There is no

statistically significant trend in the summer average SDT for the current 10-year period of 2004-

2013. The action level for SDT is updated annually, using the 25 th percentile of the most recent 10-

year summer averages. The 2013 summer average SDT of 3.6 meters is better than the 2013 SDT

action level was 3.55 meters.


Figure 1 Lac Lavon 2013 Water Quality Monitoring Locations


Figure 2 Lac Lavon 2013 Secchi Disc Transparency

0.0

1.0

2.0

3.0

4.0

5.0

6.0

Secc

hi D

isc

Tran

spar

en

cy (

m)

Barr - Main Basin

Barr - NW Basin

Barr - NE Basin

CAMP


Figure 3 Lac Lavon Lake (Apple Valley and Burnsville) Summer Average Water Clarity and

Trend Analysis


2.1.2 Chlorophyll a

The highest concentrations of chlorophyll a observed in Lac Lavon in 2013 were in early June (15

ug/L on 6/10/13). Chlorophyll a concentrations were low from late June through the first week of

September (Figure 4). Chlorophyll a measurements collected by Barr and the CAMP were similar for

most of the most monitoring season; however, chlorophyll a measurements collected by Barr in May

and early June were higher than CAMP measurements for the same time period.

The summer average (June 1 through September 30) chlorophyll a concentrations are plotted in

Figure 5. There is no statistically significant trend in the summer-average chlorophyll a

concentrations over the current 10-year period of 2004-2013. The Lac Lavon Water Quality

Assessment report prepared after the 2008 monitoring year had reported a statistically increasing

trend in chlorophyll a concentrations over the 10-year period ending in 2008. In years 2009-2012,

Lac Lavon experienced summer average chlorophyll a concentrations lower than years 2006-2008.

The summer average chlorophyll a concentration in 2013 was 3.1 µg/L, which was similar to

concentrations of the previous four years (2009-2012).

In addition to the laboratory analysis of chlorophyll a of samples collected from the lake surface in

the Main Basin, Barr used a field probe to measure chlorophyll a at various depths in the Main Basin,

Northeast Basin, and Northwest Basin. The field probe indicates that for much of the summer season,

phytoplankton concentrations (as indicated by chlorophyll a) were typically higher in the bottom half

of the water column than the top, which suggests the phytoplankton are utilizing a greater availability

of phosphorus near the lake bottom. The relatively high water clarity of Lac Lavon allows adequate

light penetration to support phytoplankton at depths greater than 5 meters.


Figure 4 Lac Lavon 2013 Chlorophyll a Concentrations

0

2

4

6

8

10

12

14

16C

hl o

rop

hyl

l a (

µg/

L)

Barr

CAMP


Figure 5 Lac Lavon Lake (Apple Valley and Burnsville) Summer Average Chlorophyll a

Concentrations and Trend Analysis


2.1.3 Total Phosphorus

The total phosphorus concentration at the surface of Lac Lavon in 2013 was highest in spring and

early-summer, and lowest in late summer (Figure 6). This is a similar pattern to that observed in the

SDT and chlorophyll a measurements for 2013. At the time this report was prepared, CAMP total

phosphorus data were unavailable, and only total phosphorus data collected by Barr were included in

the analysis.

Total phosphorus concentrations have been measured from the surface of Lac Lavon since 1997. The

summer-average (June 1 through September 30) total phosphorus concentrations were calculated and

are plotted in Figure 7. There is no statistically significant trend in the summer-average total

phosphorus concentrations during the current 10-year period of 2004-2013. At the time of this

memorandum, 2013 CAMP total phosphorus data were unavailable. Preliminary CAMP total

phosphorus data were given to Barr, but upon examination it was discovered the total phosphorus

concentrations were unreasonably low and were inconsistent with data collected by Barr (samples

were analyzed by Braun Intertec laboratories). The Met Council laboratory was informed of the

potential problem with the CAMP phosphorus data, and the Met Council laboratory have instructed

Barr not to use 2013 CAMP total phosphorus data at this time.

In addition to surface samples, Barr collected samples at 1-meter depth intervals from 3 meters to the

bottom (approximately 8 meters) in the Main Basin of Lac Lavon in 2010. Samples were analyzed

for concentrations of total phosphorus and total dissolved phosphorus. Water quality data collected

by Barr in 2013 are presented in Appendix A. Increased concentrations of total phosphorus were

observed in samples collected near the bottom on several occasions, indicating the release of

phosphorus from lake sediments. Samples collected near the lake bottom had concentrations of total

phosphorus as high as 160 µg/L (July 8 and July 22, 2013). The release of phosphorus from lake

sediments is a regular occurrence in Minnesota lakes, but excessive levels of phosphorus release

from sediment can lead to water quality problems at the lake surface. Water quality data collected in

Lac Lavon indicate that current levels of phosphorus release from lake sediment is not causing water

quality problems in the lake.


Figure 6 Lac Lavon 2013 Total Phosphorus Concentrations

0

5

10

15

20

25

30

35

40

Tota

l Ph

osp

ho

rus

(µg/

L)

Barr


Figure 7 Lac Lavon Lake (Apple Valley and Burnsville) Summer Average Total Phosphorus

Concentrations and Trend Analysis


2.3 Aquatic Macrophyte Surveys

The Minnesota DNR had previously conducted aquatic macrophyte surveys on Lac Lavon. Barr

conducted aquatic macrophyte surveys in 2013. Three non-native species have been identified in Lac

Lavon: curlyleaf pondweed, Eurasian watermilfoil, and brittle naiad. Curlyleaf pondweed can have

negative impacts on water quality due to its earlier seasonal life cycle than native aquatic plants.

Curlyleaf pondweed dies back in early to mid-summer, resulting in the release of phosphorus from

the plants’ tissue, as well as consumption of oxygen due to organisms feeding on the dying plants.

The release of phosphorus can lead to increased phytoplankton growth. Eurasian watermilfoil can

create dense growths at the lake surface, and have a negative impact on recreational activities,

including swimming and boating. The cities, in partnership with riparian homeowners, have

conducted herbicide treatments to control Eurasian watermilfoil in various years, starting in 1996.

Curlyleaf pondweed is typically not observed at nuisance levels in Lac Lavon, but its presence is

widespread in depths suitable for aquatic macrophyte growth.

Barr conducted aquatic macrophyte surveys on Lac Lavon on June 19 and August 20, 2013. The

June 19, 2013 survey found both curlyleaf pondweed and Eurasian watermilfoil to be widespread in

areas with depths suitable for macrophyte grown (water depth less than 18-20 feet). However, levels

of curlyleaf pondweed in Lac Lavon do not appear to be at nuisance levels, and the effects of the

summer curlyleaf pondweed die-off on water quality are likely minimal. Eurasian watermilfoil grows

more dense, and is considered to be at nuisance levels. Maps showing results of the 2013 aquatic

macrophyte surveys are included in Appendix B.


3.0 Conclusions and Recommendations

3.1 Conclusions

Conclusions based on water quality monitoring and aquatic macrophyte surveys conducted in Lac

Lavon are discussed below. In summary, water quality data collected in 2013 indicate the water

quality in Lac Lavon remains very good.

3.1.1 Water Quality

There does not appear to be any significant trends in the summer averages for water quality

parameters in Lac Lavon for the period of 2004-2013, and the water quality of Lac Lavon continues

to be very good. SDT has consistently been very good in Lac Lavon, with a 2013 summer average

SDT of 3.6 meters (11.9 feet), well above the MPCA’s SDT standard for deep lakes of 1.4 meters.

The summer-average total phosphorus concentration was 23 µg/L, which is better than the MPCA

standard of 40 µg/L. The summer-average chlorophyll a concentration was 3.1 µg/L, which is better

than the MPCA standard of 14 µg/L.

3.1.2 Aquatic Macrophytes

The ecosystem of Lac Lavon appears relatively stable. However, invasive aquatic macrophytes,

including curlyleaf pondweed and Eurasian watermilfoil, are present in Lac Lavon. Curlyleaf

pondweed can potentially have a negative impact on water quality if it grows in large enough

quantities. Aquatic macrophyte surveys should continue periodically. Aquatic surveys should be

conducted in early June in order to assess curlyleaf pondweed density, as curlyleaf pondweed dies

back in mid-summer.

3.2 Recommended Monitoring for Lac Lavon

The following sections present the recommended future monitoring activities for Lac Lavon.

3.2.1 Continued Water Quality Monitoring

Barr recommends continuation of the annual CAMP water quality monitoring program, which

consists of total phosphorus, chlorophyll a, and SDT data collected from the surface of the Main

Basin. Additionally, the BDWMO Watershed Management Plan calls for management-level

monitoring of Lac Lavon every three years. No additional water quality measurements beyond these

efforts are required at this time.


3.2.2 Macrophyte Surveys

Aquatic macrophyte surveys should continue in order to monitor the aquatic plant community of Lac

Lavon. In particular, curlyleaf pondweed should be watched closely, as high densities of curlyleaf

pondweed can have a negative impact on water quality. Curlyleaf pondweed has an earlier life cycle

than native plant communities. Dense growth can occur early in the season, resulting in an early

summer die off. The early introduction of a large amount of decaying vegetation can cause an

increase in the internal phosphorus loading of a lake. Due to the early life cycle of curlyleaf

pondweed, an aquatic macrophyte survey should be conducted in early June for purposes of

monitoring curlyleaf pondweed.

If there is interest in controlling the invasive aquatic macrophytes in Lac Lavon with an herbicide

treatment or other control measures, a point-intercept aquatic macrophyte survey should be

conducted and an aquatic vegetation management plan should be developed.

3.2.3 Lake Levels

Lac Lavon has no regularly flowing outlet, and the lake level changes in response to precipitation,

evaporation, and groundwater flux. Lake elevation data has been collected regularly starting in 2010

by staff from the City of Apple Valley. The lake elevation has fluctuated from a low of 927.6 feet on

June 2, 2010 to a high of 931.05 feet on July 15, 2011 (Figure 9). Monthly lake level monitoring is

an inexpensive measurement that can be useful for estimating the groundwater flux into Lac Lavon.

The lake level should continue to be monitored.


Figure 9 Lac Lavon Surface Water Elevations

Appendices

Appendix A

2013 Lac Lavon Water Quality Monitoring Data

(Barr Engineering)

Table 12013 Water Quality Data

Lac Lavon Lake (Main Basin) : Water Quality Data

Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

Chl. A

(ug/L)

Turbidity

(NTU's)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

Total P

(mg/L)

Total

Dissoved P

(TDP)

(mg/L)

pH

(Std. Units)

eh

(mv)

05/13/13 8.2 1.5 0-2 6.7 4.1 -- -- -- 0.035 <0.010 -- --0.0 11.7 12.8 569 -- -- 8.3 2261.0 12.0 12.5 569 -- -- 8.6 2232.0 12.0 12.0 570 -- -- 8.6 2213.0 12.2 12.2 574 0.038 0.016 8.6 2194.0 8.2 7.6 658 0.038 <0.010 8.0 2275.0 0.7 5.9 701 0.039 0.016 7.5 2286.0 0.2 5.6 716 0.045 0.014 7.4 567.0 0.1 5.4 731 0.034 0.017 7.4 -1088.0 0.0 5.4 752 0.034 0.013 7.5 -150

05/28/13 9.0 2.3 0-2 6.7 3.2 -- -- -- 0.024 <0.010 -- --0.0 9.0 15.0 562 -- -- 8.4 1511.0 9.0 15.0 563 -- -- 8.4 1522.0 8.8 15.0 562 -- -- 8.3 1533.0 8.6 15.0 563 0.023 0.017 8.3 1544.0 6.3 12.2 607 0.024 <0.010 7.9 1625.0 0.1 7.5 685 0.048 0.019 7.4 1706.0 0.0 6.4 702 0.038 0.014 7.4 257.0 0.0 6.0 722 0.045 <0.010 7.4 -358.0 0.0 5.8 743 0.049 <0.010 7.5 -1528.5 0.0 5.8 758 0.050 0.023 7.5 -172.0

2013 Water Quality Data


Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

Chl. A

(ug/L)

Turbidity

(NTU's)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

Total P

(mg/L)

Total

Dissoved P

(TDP)

(mg/L)

pH

(Std. Units)

eh

(mv)

06/10/13 8.4 2.4 0-2 15.0 3.5 -- -- -- 0.029 0.020 -- --0.0 10.7 17.7 560 -- -- 8.4 1111.0 10.7 17.7 561 -- -- 8.4 1122.0 10.6 17.7 561 -- -- 8.3 1133.0 9.8 17.4 564 0.023 0.014 8.2 1154.0 8.3 14.1 601 0.022 0.018 7.8 1255.0 0.5 9.2 695 0.028 0.021 7.1 1386.0 0.1 6.8 712 0.044 0.018 6.9 1367.0 0.0 6.3 729 0.053 0.019 7.4 -178.0 0.0 6.0 748 0.065 0.023 8.1 -148

06/24/13 9.1 2.7 0-2 4.0 1.4 -- -- -- 0.031 <0.010 -- --0.0 9.7 24.8 541 -- -- 8.6 601.0 9.8 24.6 541 -- -- 8.5 602.0 9.8 24.4 542 -- -- 8.5 613.0 10.6 21.5 567 0.020 <0.010 8.3 654.0 11.2 16.4 595 0.023 <0.010 8.1 685.0 2.9 11.1 697 0.032 <0.010 7.4 856.0 0.4 8.1 712 0.037 <0.010 7.1 897.0 0.1 7.3 726 0.050 0.018 7.1 418.0 0.1 6.6 753 0.065 0.019 7.2 -1128.5 0.0 6.4 779 0.073 <0.010 7.4 -144



Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

Chl. A

(ug/L)

Turbidity

(NTU's)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

Total P

(mg/L)

Total

Dissoved P

(TDP)

(mg/L)

pH

(Std. Units)

eh

(mv)

07/08/13 8.5 4.4 0-2 1.3 1.0 -- -- -- 0.026 0.026 -- --0.0 8.6 26.4 546 -- -- 8.2 1141.0 8.3 26.3 546 -- -- 8.3 1052.0 8.4 26.1 546 -- -- 8.3 1083.0 8.2 25.5 549 0.022 0.021 8.3 1074.0 10.4 21.3 608 0.026 0.023 7.8 1105.0 9.6 13.8 696 0.025 0.021 7.3 1176.0 0.6 9.3 721 0.038 0.022 7.0 1257.0 0.2 8.2 734 0.051 0.022 7.0 1278.0 0.0 7.1 758 0.110 0.020 7.1 358.5 0.0 6.7 806 0.160 0.026 7.2 -116

07/22/13 9.4 3.6 0-2 1.3 1.5 -- -- -- 0.020 <0.010 -- --0.0 7.8 26.6 531 -- -- 8.6 1061.0 7.8 26.6 531 -- -- 8.6 1012.0 7.7 26.6 532 -- -- 8.6 983.0 7.7 26.6 530 0.026 0.020 8.6 964.0 8.0 23.9 539 0.024 0.021 8.3 995.0 9.3 17.5 695 0.024 <0.010 7.8 1056.0 4.0 11.9 729 0.037 0.022 7.4 1127.0 0.0 8.9 748 0.074 0.023 7.3 1158.0 0.0 7.5 785 0.067 0.024 7.2 -19.0 0.0 7.4 840 0.160 0.029 7.4 -75



Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

Chl. A

(ug/L)

Turbidity

(NTU's)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

Total P

(mg/L)

Total

Dissoved P

(TDP)

(mg/L)

pH

(Std. Units)

eh

(mv)

08/09/13 9.1 4.1 0-2 2.7 1.2 -- -- -- 0.015 0.015 -- --0.0 9.3 23.1 523 -- -- 8.8 741.0 9.3 23.1 523 -- -- 8.8 762.0 9.3 23.1 523 -- -- 8.8 763.0 9.3 23.1 524 0.018 0.022 8.8 804.0 6.5 22.8 548 0.022 0.019 8.2 915.0 5.8 20.0 638 0.018 0.015 7.7 996.0 2.5 14.2 707 0.024 0.020 7.4 1077.0 0.0 10.9 718 0.052 <0.010 7.3 1118.0 0.0 8.6 749 0.075 0.014 7.3 -188.5 0.0 7.8 816 0.098 0.017 7.4 -111

08/22/13 9.1 3.3 0-2 1.3 1.2 -- -- -- 0.020 0.018 -- --0.0 9.5 24.8 522 -- -- 8.9 631.0 9.7 24.7 523 -- -- 8.9 642.0 9.7 24.8 521 -- -- 8.9 663.0 9.8 24.3 525 0.023 <0.010 8.7 684.0 8.1 23.6 543 0.024 <0.010 8.2 775.0 6.4 28.8 640 0.027 0.020 7.6 866.0 2.3 15.6 711 0.031 0.024 7.2 947.0 0.0 11.5 732 0.087 0.019 7.1 978.0 0.0 9.4 753 0.060 0.022 7.0 138.5 0.0 8.1 820 0.14 0.029 7.3 -106



Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

Chl. A

(ug/L)

Turbidity

(NTU's)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

Total P

(mg/L)

Total

Dissoved P

(TDP)

(mg/L)

pH

(Std. Units)

eh

(mv)

09/06/13 9.1 3.7 0-2 5.3 1.0 -- -- -- 0.014 <0.010 -- --0.0 8.6 24.5 543 -- -- 8.7 531.0 8.7 24.5 543 -- -- 8.7 542.0 8.7 24.5 542 -- -- 8.7 553.0 8.5 24.4 542 0.015 0.011 8.6 564.0 6.0 24.0 556 0.016 <0.010 8.2 635.0 3.5 21.9 639 0.020 0.012 7.5 746.0 0.0 17.2 712 0.022 0.012 7.1 797.0 0.0 12.6 743 0.039 0.014 7.0 248.0 0.0 9.4 767 0.066 0.013 6.9 108.5 0.0 8.6 870 0.078 0.015 7.1 -95

09/20/13 8.5 2.7 0-2 2.7 2.1 -- -- -- 0.021 <0.010 -- --0.0 8.0 20.2 561 -- -- 8.4 411.0 8.0 20.3 561 -- -- 8.4 432.0 7.9 20.3 561 -- -- 8.4 453.0 8.0 20.3 562 0.022 0.020 8.4 474.0 8.0 20.3 562 0.021 0.016 8.4 495.0 7.8 20.3 561 0.019 <0.010 8.4 516.0 0.0 18.1 670 0.019 0.016 7.5 667.0 0.0 13.0 746 0.041 0.021 7.2 -98.0 0.0 9.9 781 0.048 0.017 7.0 -538.5 0.0 8.9 865 0.13 0.024 7.2 -108



Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

Chl. A

(ug/L)

Turbidity

(NTU's)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

Total P

(mg/L)

Total

Dissoved P

(TDP)

(mg/L)

pH

(Std. Units)

eh

(mv)

8.5 0-2 -- -- -- -- --0.0 -- --1.0 -- --2.0 -- --3.04.05.06.07.08.0

8.5 0-2 -- -- -- -- --0.0 -- --1.0 -- --2.0 -- --3.04.05.06.07.08.0



Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

Chl. A

(ug/L)

Turbidity

(NTU's)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

Total P

(mg/L)

Total

Dissoved P

(TDP)

(mg/L)

pH

(Std. Units)

eh

(mv)

8.5 0-2 -- -- -- -- --0.0 -- --1.0 -- --2.0 -- --3.04.05.06.07.08.0


Lac Lavon Lake (Northwest Basin) : Water Quality Data

Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

pH

(Std. Units)

eh

(mv)

05/13/13 9.4 1.5 -- -- -- -- -- --0.0 11.9 12.8 567 8.2 851.0 12.0 12.7 567 8.5 852.0 12.0 12.7 567 8.6 853.0 12.1 12.6 569 8.7 854.0 6.3 7.2 654 7.8 985.0 1.2 6.0 698 7.5 1016.0 0.2 5.7 709 7.4 437.0 0.1 5.5 717 7.4 -528.0 0.0 5.4 721 7.4 -1099.0 0.0 5.4 724 7.4 -134

05/28/13 9.0 2.3 -- -- -- -- -- --0.0 9.1 15.2 561 8.4 1111.0 9.1 15.2 562 8.4 1112.0 9.0 15.2 562 8.4 1113.0 8.9 15.1 562 8.4 1114.0 7.2 12.5 606 8.0 1195.0 0.2 7.4 688 7.5 1286.0 0.04 6.4 701 7.4 477.0 0.0 6.1 709 7.4 -198.0 0.0 5.9 714 7.5 -1268.5 0.0 5.8 721 7.5 -161



Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

pH

(Std. Units)

eh

(mv)

06/10/13 8.6 2.6 -- -- -- -- -- --0.0 10.7 18.1 560 8.4 921.0 10.8 17.9 560 8.4 902.0 10.5 17.7 561 8.4 903.0 10.1 17.4 564 8.3 914.0 7.3 14.1 601 7.8 1025.0 0.3 8.9 688 7.3 1146.0 0.1 7.0 706 7.0 1107.0 0.0 6.5 713 7.4 -78.0 0.0 6.4 720 7.6 -61

06/24/13 9.1 2.8 -- -- -- -- -- --0.0 9.5 24.8 540 8.1 1071.0 9.8 24.8 540 8.1 1042.0 9.7 24.5 540 8.2 1023.0 10.7 22.3 562 8.0 1024.0 11.2 16.4 601 7.6 1055.0 3.5 10.9 693 6.9 1176.0 0.5 8.5 710 6.8 1187.0 0.1 7.7 717 6.9 948.0 0.1 6.9 724 7.0 228.5 0.1 6.6 732 7.1 -62



Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

pH

(Std. Units)

eh

(mv)

07/08/13 9.1 3.9 -- -- -- -- -- --0.0 8.5 26.6 546 6.9 811.0 8.4 26.3 546 7.2 772.0 8.3 26.0 547 7.5 753.0 8.0 25.3 552 7.5 764.0 11.5 19.9 610 7.2 785.0 7.0 12.7 707 6.2 926.0 0.5 9.5 719 6.2 977.0 0.2 8.1 723 6.3 988.0 0.0 7.4 735 6.4 378.6 0.0 6.9 750 6.8 -67

07/22/13 9.3 3.6 -- -- -- -- -- --0.0 7.7 26.7 530 8.6 801.0 7.6 26.7 530 8.6 782.0 7.8 26.7 531 8.6 773.0 7.6 26.6 531 8.6 764.0 7.7 24.1 589 8.3 805.0 9.0 16.0 707 7.7 896.0 2.4 11.5 731 7.4 977.0 0.1 9.0 735 7.4 998.0 0.0 7.9 742 7.3 658.6 0.0 7.0 774 7.3 -94



Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

pH

(Std. Units)

eh

(mv)

08/09/13 9.1 3.9 -- -- -- -- -- --0.0 9.3 23.1 524 8.2 2101.0 9.5 23.2 524 8.5 2052.0 9.5 23.1 525 8.5 2033.0 9.5 23.1 523 8.5 2024.0 7.5 22.8 544 8.0 2065.0 5.5 20.0 646 7.4 2096.0 2.4 14.4 707 7.2 2117.0 0.0 10.7 711 7.2 2098.0 0.0 8.7 712 7.1 1358.6 0.0 7.6 746 7.4 -74

08/22/13 9.1 3.3 -- -- -- -- -- --0.0 9.5 24.8 524 8.6 1541.0 9.7 24.8 523 8.6 1502.0 9.9 24.6 523 8.6 1483.0 9.9 24.3 526 8.5 1484.0 8.3 23.8 538 8.2 1505.0 6.5 20.7 647 7.4 1596.0 1.9 15,6 711 7.0 1637.0 0.0 11.6 715 7.1 1618.0 0.0 9.2 725 7.0 958.5 0.0 7.9 764 7.1 -50



Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

pH

(Std. Units)

eh

(mv)

09/06/13 8.5 3.9 -- -- -- -- -- --0.0 9.2 25.0 506 8.6 551.0 9.2 25.0 506 8.7 542.0 9.3 25.0 505 8.7 543.0 9.3 25.0 506 8.7 544.0 8.7 24.8 509 8.7 565.0 8.4 24.2 519 8.5 516.0 8.1 20.0 628 7.6 757.0 2.8 15.5 677 7.2 808.0 0.0 12.2 684 7.2 76

09/20/13 9.5 2.8 -- -- -- -- -- --0.0 8.0 20.3 561 8.0 1561.0 8.0 20.3 561 8.1 1552.0 8.0 20.3 561 8.1 1543.0 8.0 20.3 562 8.2 1544.0 7.9 20.3 562 8.2 1545.0 6.1 20.2 567 7.9 1566.0 0.0 18.1 680 7.2 1677.0 0.0 12.8 729 7.1 1208.0 0.0 9.9 739 7.0 469.0 0.0 8.5 805 6.9 -28



Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

pH

(Std. Units)

eh

(mv)

9.4 0-2 -- -- -- -- --0.01.02.03.04.05.06.07.08.09.0

8.7 0-2 -- -- -- -- --0.01.02.03.04.05.06.07.08.09.0


Lac Lavon Lake (Northeast Basin) : Water Quality Data

Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

pH

(Std. Units)

eh

(mv)

04/30/13 8.3 1.9 -- -- -- -- -- --

0.0 11.5 13.2 537 8.3 217

1.0 11.5 13.1 536 8.4 216

2.0 11.5 13.1 537 8.6 214

3.0 11.6 9.9 511 8.8 213

4.0 12.9 6.6 627 8.4 216

5.0 8.6 5.0 649 8.0 218

6.0 5.3 4.8 656 7.7 217

7.0 2.2 4.8 661 7.6 218

8.0 1.1 4.9 663 7.5 218

05/28/13 8.5 2.5 -- -- -- -- -- --

0.0 9.0 15.6 550 7.9 152

1.0 9.0 15.6 551 8.0 151

2.0 8.9 15.5 558 8.0 150

3.0 8.6 15.2 555 8.0 150

4.0 12.4 10.4 588 8.2 150

5.0 9.8 7.0 632 7.9 156

6.0 5.0 5.7 645 7.6 160

7.0 0.6 5.3 658 7.4 161

8.0 0.1 5.3 660 7.3 159

C:\Users\amb2\Desktop\LacLavon\KDM_combined_Lac Lavon-2013 wq DATA.xlsx



Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

pH

(Std. Units)

eh

(mv)

06/10/13 8.5 2.4 -- -- -- -- -- --

0.0 11.2 18.0 551 8.4 137

1.0 11.2 18.0 554 8.4 137

2.0 10.6 17.7 557 8.3 138

3.0 10.0 17.3 558 8.3 138

4.0 13.4 13.0 575 8.3 138

5.0 10.5 8.2 638 7.8 146

6.0 5.0 6.5 657 7.7 153

7.0 0.9 6.0 665 7.4 156

8.0 0.2 5.8 667 7.3 152

06/24/13 8.5 2.6 -- -- -- -- -- --

0.0 10.1 25.2 530 7.8 93

1.0 10.2 25.0 531 8.0 88

2.0 10.2 24.7 530 8.0 87

3.0 12.2 21.9 552 7.9 87

4.0 14.8 16.1 567 7.6 86

5.0 12.8 11.2 636 7.2 92

6.0 7.6 8.3 662 7.0 103

7.0 0.8 6.7 673 6.9 109

8.0 0.2 6.5 675 7.0 77




Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

pH

(Std. Units)

eh

(mv)

07/08/13 8.2 5.2 -- -- -- -- -- --

0.0 8.4 27.0 534 8.3 42

1.0 8.6 26.7 534 8.3 42

2.0 8.4 26.2 534 8.2 43

3.0 8.0 25.7 535 8.1 44

4.0 11.9 21.3 575 7.8 47

5.0 13.4 15.4 623 7.5 50

6.0 6.5 9.5 669 6.9 60

7.0 1.5 7.9 682 6.8 65

8.0 0.2 7.5 686 6.8 45

8.5 0.1 7.3 689 7.0 -3

07/22/13 8.5 3.9 -- -- -- -- -- --

0.0 7.6 27.2 513 8.8 46

1.0 7.7 27.2 512 8.8 46

2.0 7.8 27.2 512 8.8 46

3.0 7.8 27.2 513 8.8 46

4.0 9.4 25.8 534 8.6 50

5.0 13.5 19.4 614 8.4 54

6.0 10.6 13.3 665 7.9 61

7.0 4.6 9.6 688 7.5 70

8.0 0.1 8.5 695 7.4 73




Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

pH

(Std. Units)

eh

(mv)

08/09/13 8.5 4.5 -- -- -- -- -- --

0.0 9.8 23.7 495 8.9 100

1.0 9.9 23.5 495 9.0 97

2.0 9.9 23.5 494 9.0 94

3.0 9.9 23.4 494 9.0 93

4.0 9.8 23.4 495 9.0 92

5.0 10.1 22.0 550 8.5 100

6.0 9.6 17.1 634 8.0 108

7.0 6.4 11.9 665 7.8 112

8.0 0.0 9.9 672 7.5 118

08/22/13 9.0 3.6 -- -- -- -- -- --

0.0 9.7 25.1 490 8.5 70

1.0 9.7 25.1 490 8.8 69

2.0 9.7 25.1 490 8.9 68

3.0 9.9 24.7 491 8.9 68

4.0 10.1 24.3 491 8.8 68

5.0 9.9 23.2 519 8.5 74

6.0 9.3 18.6 628 7.7 88

7.0 5.4 14.3 657 7.4 94

8.0 0.0 10.7 677 7.2 88

8.5 0.0 9.9 695 7.2 -61




Date

Max.

Depth (M)

Secchi

Disc

(M)

Sample

Depth

(M)

D.O.

(mg/L)

Temp.

(Celsius)

Specific Cond.

(umho/cm @ 25 C)

pH

(Std. Units)

eh

(mv)

09/06/13 9.0 3.5 -- -- -- -- -- --

0.0 8.5 24.5 545 8.3 135

1.0 8.5 24.5 543 8.4 130

2.0 8.5 24.5 543 8.5 128

3.0 8.5 24.5 542 8.5 126

4.0 6.5 24.1 556 8.2 129

5.0 3.6 21.3 658 7.3 136

6.0 0.0 17.4 712 7.0 139

7.0 0.0 12.4 727 7.0 136

8.0 0.0 9.8 739 6.9 71

8.5 0.0 8.6 770 6.9 -30

09/20/13 8.5 4.1 -- -- -- -- -- --

0.0 8.9 20.8 512 9.0 66

1.0 8.9 20.9 511 9.0 68

2.0 8.8 20.9 511 8.9 70

3.0 8.8 20.9 511 8.9 72

4.0 8.6 20.9 512 8.9 73

5.0 7.7 20.8 520 8.7 77

6.0 6.1 20.3 552 8.3 86

7.0 0.0 17.1 665 7.6 96

8.0 0.0 12.8 683 7.4 -29


Appendix B

2013 Lac Lavon Aquatic Macrophyte Surveys (Barr Engineering)

Lythrum salicaria

Lythrum salicaria

Lythrum salicaria

Najas flexilis

Lythrum salicaria

Ceratophyllum demersum - 2-3

Chara sp. - 1

Elodea canadensis - 1

Myriophyllum spicatum - 2-3+Potamogeton bicupulatus - 1-2

Potamogeton crispus - 1-2+Potamogeton illinoensis - 1-2

Ranunculus longirostris - 1

Zosterella dubia - 1-2

160th St W��46

Nymphaea tuberosa


Chara sp. - 1

Myriophyllum spicatum - 2-3+Potamogeton bicupulatus - 1

Potamogeton crispus - 1-2Potamogeton illinoensis - 1-2+

Potamogeton nodosus -1

Zosterella dubia - 1

Chara sp. - 1

Myriophyllum spicatum - 2-3Potamogeton bicupulatus - 1-2




Chara sp. -1




Chara sp. - 3


Myriophyllum spicatum - 3 (treated)Potamogeton bicupulatus - 1-2

Potamogeton crispus - 1Potamogeton illinoensis - 1-2



Chara sp. - 2


Myriophyllum spicatum - 2-3Potamogeton bicupulatus - 1



Potamogeton nodosus-1

Potamogaton pusillus-1

Ranunculus longirostris -1

Ceratophyllum demersum - 1

Chara sp. - 1



Potamogeton crispus - 1-2Potamogeton illinoensis - 1

Potamogeton sp. - 1


Potamogeton nodosus - 1

Chara sp. - 2-3



Potamogeton crispus - 1-3Potamogeton illinoensis - 1-2

Potamogeton sp. - 1-2



Ceratophyllum demersum - 3+

Potamogeton zosteriformis -1

Whitney Dr

Ceratophyllum demersum - 1-3+

Chara sp. - 3




Ranunculus longirostris - 1-2



Stuckenia pectinata -1


Chara sp. - 2-3





Stuckenia pectinata

Potamogeton nodosus - 1-2

!?WQ Monitoring- NW Basin

!?WQ Monitoring- Main Basin

Elev. CulvertBenchmark

!(

WQ Monitoring- NE Basin

!?

!(Elev. StaffGauge Benchmark

!;N

0 150 300

Meters

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Feet

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Imagery Source: Aerials Express, 2009

LAC LAVON MACROPHYTESURVEY RESULTS

June 19, 2013FIELD NOTES:- Macrophyte densities estimated as follows: 1=light; 2=moderate; 3=heavy- Max growing depth approximately 18-20'

Emergent Plants

Floating Leaf Plants

Submerged Aquatic Plants

No Aquatic Vegetation

*Note: Bold red name indicates extremely aggressive/invasive introduced species.

* MNDNR has this lake listed as being infested with Naja minor (Brittle naiad), Barr did not sample or observe this species during theJune Survey. Barr did sample and observe thisspecies during the August 20th survey.

Common Name Scientific Name

Sago pondweed Stuckenia pectinata

Small pondweed Potamogeton pusillius

Flatstem pondweed Potamogeton zosteriformis

Longleaf pondweed Potamogeton nodosus

Slender naiad Najas flexilis

Stonewort Nitella sp.

Coontail Ceratophyllum demersum

Curlyleaf pondweed Potamogeton crispus

Eurasian watermilfoil Myriophyllum spicatum

Muskgrass Chara sp.

White water crowfoot Ranunculus longirostris

Water stargrass Zosterella dubia

Illinois pondweed Potamogeton illinoensis

Canada waterweed Elodea canadensis

Bushy pondweed Najas sp.

Water thread pondweed Potamogeton b icupulatus


White waterlily Nymphaea tuberosa


Purple loosestrife Lythrum salicaria

Emergent Plants



Lythrum salicaria

Lythrum salicaria

Lythrum salicaria

Najas flexilis

Lythrum salicaria


Chara sp. - 1






Nymphaea tuberosa


Chara sp. - 1-2


Potamogeton crispus - 1-2Potamogeton illinoensis - 1-2+

Potamogeton nodosus -1-2


Chara sp. - 1




Najas minor - 1


Chara sp. -1




Chara sp. - 3


Myriophyllum spicatum - 3 (treated)Potamogeton bicupulatus - 1-2




Chara sp. - 2





Potamogeton nodosus-1

Potamogaton pusillus-1

Ranunculus longirostris -1

Najas minor - 1-2

Ceratophyllum demersum - 1

Chara sp. - 1




Potamogeton sp. - 1



Chara sp. - 2-3



Potamogeton crispus - 1-3Potamogeton illinoensis - 1-2




Ceratophyllum demersum - 3+

Potamogeton zosteriformis -1

Whitney Dr


Chara sp. - 3




Ranunculus longirostris - 1-2



Stuckenia pectinata -1


Chara sp. - 2-3





Stuckenia pectinata



!?WQ Monitoring- NW Basin

!?WQ Monitoring- Main Basin

Elev. CulvertBenchmark

!(

WQ Monitoring- NE Basin

!?

!(Elev. StaffGauge Benchmark

Lythrumsalicaria

Lythrum

salicaria

Non native lily

Najas

minor - 1

Najas minor - 2

Najas minor - 2

Najas minor - 2-3

Najas minor - 2-3

Lythrum

salicaria

Najasminor - 1-2

Najas minor - 1-2

!;N

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Imagery Source: Aerials Express, 2009

LAC LAVON MACROPHYTESURVEY RESULTS

August 20, 2013

FIELD NOTES:- Macrophyte densities estimated as follows: 1=light; 2=moderate; 3=heavy- Max growing depth approximately 18-20'- Non native lily planted by homeowner was observed in north bay - northwest of WQ Monitoring Station (NW Basin)

Emergent Plants



No Aquatic Vegetation

*Note: Bold red name indicates extremely aggressive/invasive introduced species.

* MNDNR has this lake listed as being infested with Naja minor (Brittle naiad), Barr did not sample or observe this species during theJune Survey. Barr did sample and observe thisspecies during the August 20th survey.


Sago pondweed Stuckenia pectinata

Small pondweed Potamogeton pusillius

Flatstem pondweed Potamogeton zosteriformis

Longleaf pondweed Potamogeton nodosus

Slender naiad Najas flexilis

Stonewort Nitella sp.

Coontail Ceratophyllum demersum

Curlyleaf pondweed Potamogeton crispus

Eurasian watermilfoil Myriophyllum spicatum

Muskgrass Chara sp.

White water crowfoot Ranunculus longirostris

Water stargrass Zosterella dubia

Illinois pondweed Potamogeton illinoensis

Canada waterweed Elodea canadensis

Bushy pondweed Najas sp.

Brittle naiad Najas minor

Water thread pondweed Potamogeton b icupulatus


White waterlily Nymphaea tuberosa


Purple loosestrife Lythrum salicaria



Emergent Plants

BLACK DOG WATER MANAGEMENT COMMISSIONBudget Projections for Keller Lake alum treatment and ten year plan update

Estimate Budget2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 total

Beginning Fund Balance 209,000 236,000 245,000 267,000 289,000 311,000 333,000 297,000 151,000 115,000 79,000 43,000 43,000

Revenues / ContributionsCurrent member contributions 135,000 135,000 135,000 135,000 135,000 135,000 135,000 135,000 135,000 135,000 135,000 135,000 135,000

Additional project contribution (estimate) 22,000 22,000 22,000 22,000 22,000 22,000 22,000 22,000 22,000 198,000

Total 135,000 135,000 157,000 157,000 157,000 157,000 157,000 157,000 157,000 157,000 157,000 135,000 135,000

ExpensesAnnual operating expenses 108,000 126,000 135,000 135,000 135,000 135,000 135,000 135,000 135,000 135,000 135,000 135,000 135,000

Keller Lake alum treatment 58,000 58,000 58,000 58,000 58,000 290,000

Ten year plan update 110,000 110,000

108,000 126,000 135,000 135,000 135,000 135,000 193,000 303,000 193,000 193,000 193,000 135,000 135,000

Excess of Revs Over (Under) Exp 27,000 9,000 22,000 22,000 22,000 22,000 (36,000) (146,000) (36,000) (36,000) (36,000) - -

Ending Fund Balance 236,000 245,000 267,000 289,000 311,000 333,000 297,000 151,000 115,000 79,000 43,000 43,000 43,000

Desired Minimum Fund Balance 40,000 40,000 40,000 40,000 40,000 40,000 40,000 40,000 40,000 40,000 40,000 40,000 40,000

Fund balance over minimum target 196,000 205,000 227,000 249,000 271,000 293,000 257,000 111,000 75,000 39,000 3,000 3,000 3,000

Assumptions:Maintain at least $40,000 fund balanceMinimum contribution needed to fund the Keller Lake alum treatment & ten year plan updateAnnual contribution increase beginning 2015, equal amounts each yearProject costs:

$110,000 for ten year plan update finished in 2022 - two year process$58,000 each year for five years for Keller Lake alum treatment beginning 2019

Annual expenses of $135,000 will continue with minimal inflation increases

Summary:BDWMO will need $400,000 in additional funds to cover the 10 yr plan update and Keller Lake Alum treatmentTen year plan update 110,000 Keller Lake alum treatment ($58K X 5 yrs) 290,000 Project costs 400,000

Current available resources: Estimated fund balance at YE 2014 245,000 Minimum fund balance target 40,000

Available reserves at YE 2014 205,000 strategy: use $110,000 of existing reserves for ten year plan update and remaining $95,000 for Keller Lake alum treatment

Funding needed (difference) 195,000 additional funding needed for Keller Lake alum treatment

Additional funding needs per year 22,000 per year for nine years (2015-2023), rounded

-

50,000

100,000

150,000

200,000

250,000

300,000

350,000

2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025

Fund balance projection 2013-2025

Ending Fund Balance Desired Minimum Fund Balance

Ten year plan update

Keller Lake alum treatment

Plan A: Alum treatment paid for out of the general fund, all members participate Plan B: Alum treatment not paid for out of the general fund, Apple Valley/Burnsville/Lakeville participate

BUDGET - MEMBER CONTRIBUTIONS 135,000$ BUDGET - MEMBER CONTRIBUTIONS 135,000$ - PROJECT CONTRIBUTIONS 22,000 - PROJECT CONTRIBUTIONS 22,000

157,000$ per year 157,000$ per year

Current and project contributions are based on 50% Area and 50% Valuation Using: Current contributions are based on 50% Area and 50% Valuation Using: * Property records for tax year payable 2013 * Property records for tax year payable 2013 * Total Land Area = 17,507 acres * Total Land Area = 17,507 acres

Project contributions are based 100% on Valuation (Apple Valley/Burnsville/Lakeville)

CITY

Current contribution

2014

Additional contribution

per year

Total contribution

per year

Additional contribution2015-2023 CITY

Current contribution

2014

Additional contribution

per year

Total contribution

per year

Additional contribution2015-2023

difference per year

between plans

cumulative difference 2015-2023

APPLE VALLEY 11,461$ 1,868$ 13,329$ $16,812 APPLE VALLEY 11,461$ 1,987$ 13,448$ $17,883 $119 $1,071

BURNSVILLE 101,431$ 16,529$ 117,960$ $148,761 BURNSVILLE 101,431$ 17,660$ 119,091$ $158,940 $1,131 $10,179

EAGAN 621$ 101$ 722$ $909 EAGAN 621$ -$ 621$ $0 -$101 -$909

LAKEVILLE 21,488$ 3,502$ 24,990$ $31,518 LAKEVILLE 21,488$ 2,353$ 23,841$ $21,177 -$1,149 -$10,341

TOTAL 135,000$ 22,000$ 157,000$ $198,000 TOTAL 135,000$ 22,000$ 157,000$ $198,000 $0 $0

Both plans use the 50% land area and 50% land valuation formula for the current contribution (operations).Both plans use $110,000 of existing reserves to fund the ten year plan update and $95,000 of existing reserves towards the Keller Lake alum treatment. Both plans need an additional $22,000 per year to fund the Keller Lake alum treatment, the difference is how this amount is calculated.

- Plan A's additional contribution is funded based on 50% land area and 50% land valuation and includes all member cities (same formula as operations). - Plan B's additional contribution is based 100% on land valuation and includes member cities within the benefited area (Apple Valley/Burnsville/Lakeville). A capital improvement fund would be established.

BLACK DOG WATERSHED MANAGEMENT ORGANIZATION

2015-2023 MEMBER CONTRIBUTION ESTIMATE

BLACK DOG WATERSHED MANAGEMENT ORGANIZATION

2015-2023 MEMBER CONTRIBUTION ESTIMATE

black dog watershed management commissionblackdogwmo.org/agendas/packet 03-19-14a.pdf · black dog...

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