Black Dog Watershed Management Commission

Transcription

1 Black Dog Watershed Management Commission COMMISSIONERS: Revised Agenda Wednesday, March 20, :00 P.M. BURNSVILLE MAINTENANCE FACILITY Conference Room (13713 Frontier Court, Burnsville MN 55337) Roger Baldwin (Chair) Mary Hamann-Roland (Vice-Chair) Mike Hughes (Alt.) Scott Thureen(Secretary/Treasurer) Greg Helms (Alt.) Tom Harmening Loren Knott Tom Goodwin (Alt.) I. Approval of Agenda II. Consider Approval of Minutes February 20, 2013 III. IV. Consider Approving Accounts Payable Review of Budget Performance Reports V. Overview of 2012 Crystal Lake Water Quality Monitoring Report VI. VII. VIII. Consider Approval of Lakes to Enroll in the 2013 Metropolitan Council Citizen Assisted Monitoring Program (CAMP) Miscellaneous 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) , TDD (952)

2 Black Dog Watershed Management Commission 1. Approval of Agenda Agenda enclosed. Agenda Background March 20, 2013 Action Requested: A motion be considered to approve the Agenda. 2. Consider Approval of Minutes from the February 20, 2013 Meeting Minutes enclosed. Action Requested: A motion be considered to approve the Minutes of the February 20, 2013 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 2012 Crystal Lake Water Quality Monitoring Report In 2012 Barr Engineering performed increased monitoring on Crystal Lake. 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.

3 6. Consider Approval of Lakes to Enroll in the 2012 Metropolitan Council Citizen Assisted Monitoring Program (CAMP) Enclosed for your review is a memo prepared on behalf of the City of Burnsville and the BDWMO regarding the above program. It 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 2013 Budget. Staff recommends the Commission approve enrolling these five sites in the 2013 CAMP. Action Requested: The Commission considers a motion approving enrollment of Crystal Lake, Keller Lake, Kingsley Lake, Orchard Lake, and Lac Lavon in the 2013 CAMP. 7. Miscellaneous -Distribution of the Annual Newsletter -Discuss Proposed Amendments to the Watershed Management Rules.

4 BLACK DOG WATERSHED MANAGEMENT COMMISSION Draft Minutes of February 20, 2013 MEMBERS PRESENT Tom Harmening Mike Hughes (Alt) Scott Thureen (Secretary/Treasurer) Greg Helms (Alt) MEMBERS ABSENT Loren Knott Roger Baldwin (Chair) Mary Hamann-Roland (Vice-Chair) Tom Goodwin (Alt) OTHERS PRESENT Joel Jamnik - Commission Attorney Karen Chandler Barr Engineering Jane Byron City of Apple Valley Staff Ann Messerschmidt City of Lakeville Staff Daryl Jacobson BDWMO Administrator Vickie Martin BDWMO Secretary Tom Harmening, Acting Chair, called the February 20th meeting to order at 5:00 pm at the Burnsville Maintenance Facility. 1. Consider Approval of Agenda Motion by Hughes, second by Helms, to approve the Agenda as presented Ayes Hughes, Harmening, Helms Nays None Motion carried unanimously 2. Consider Approval of Minutes from the January 16, 2013 Meeting Motion by Helms, second by Hughes, to approve the January 16, 2013 Minutes. Ayes Hughes, Harmening, Helms Nays None Motion carried unanimously

5 Black Dog Watershed Management Meeting Consider Approving Accounts Payable Motion by Hughes, second by Helms, to approve payment to Campbell Knutson in the amount of $ for legal consulting services, Barr Engineering in the amount of $1, for engineering consulting, City of Burnsville in the amount of $17, for 2012 support services. Ayes Hughes, Harmening, Helms Nays None Motion carried unanimously 4. Review Budget Performance Reports Daryl Jacobson stated that MMKR will start the 2012 audit in March. They are under a two year agreement that started last year. Scott Thureen arrived 5:08 5. Review Draft of 2012 Annual Newsletter Changes from staff and commissioners include: 1. Removing TMDL chart since projects are complete. 2. Adding stories on the Management Plan and how weather affects water quality in Crystal Lake. 3. Include information on Blue Thumb Program/other Dakota County SWCD projects and Habitat Monitoring Program. 4. On page 3, clarify that rain gardens don t require use of native plants and people need to attend workshops to qualify for a grant application. 5. On page 3, remove repetitive wording on bottom of page and move/add links to provide better information and resources. 6. On page 4, add a reference to page 7 regarding Habitat Monitoring System. 7. On page 6, change Kingsley Lake preliminary date which included a wrong reading. Suggestion to take out the trend line and change water quality to excellent. 8. On page 7, add more information on what the City of Lakeville is doing about the monitoring program and what the DNR is doing about the purple loosestrife. Motion by Hughes, second by Helms, to approve the Annual Newsletter for distribution contingent upon any revisions noted being made to the report. Ayes Hughes, Thureen, Harmening, Helms Nays None Motion carried unanimously 2 P age

6 Black Dog Watershed Management Meeting Miscellaneous Next meeting scheduled for March 20, 2013, 5 pm at the Burnsville Maintenance Facility. Tom Harmening inquired if there would be harvesting on Crystal Lake and Daryl Jacobson confirmed yes. Harmening also asked who is responsible for enforcing no littering from ice fishing on Crystal Lake. Jacobson confirmed the MN DNR. 7. Adjournment Motion by Hughes, second by Thureen, to adjourn the February 20, 2013 meeting at 5:31 pm. Ayes Hughes, Thureen, Harmening, Helms Nays None Motion carried unanimously 3 P age

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11 BLACK DOG WATER MANAGEMENT COMMISSION Budget Performance Report December 31, 2012 unaudited balance as of 02/28/2013 CURRENT MONTH YEAR TO DATE ACTUAL ALLOCATIONS CARRIED FORWARD BUDGET ACTUAL VARIANCE FAVORABLE (UNFAVORABLE) Opening Fund Balance 203,423 $ 203,423 REVENUES : Member Contributions: City of Apple Valley $ - $ - $ 11,679 $ 11,679 $ - City of Burnsville , ,273 - City of Eagan City of Lakeville ,455 21,455 - Total Member Contributions , ,000 - Other Revenues: Interest $ - $ - $ 100 $ 26 $ (74) Contributions (Dakota County) Grant (Metropolitan Council) TMDL Project Total Other Revenue (74) Total Revenues $ - $ - $ 135,100 $ 135,026 $ (74) EXPENDITURES : General Engineering Support $ - $ - $ 33,000 $ 25,287 $ 7,713 Special Projects ,602 41,424 10,179 Insurance - - 3,000 1,719 1,281 Legal and Audit - - 7,950 8,444 (494) Administrative Support 17,199-13,000 17,199 (4,199) Public Education ,600 23,572 (7,972) Water Quality Monitoring ,100 11, Conference/Publications Ferric Chloride Dosing System Contingency - - 5,000-5,000 Total Expenditures 17, , ,673 12,079 EXCESS OF REVENUES OVER EXPENDITURES (17,199) - (6,652) 5,353 EXCESS OF REVENUES OVER EXPENDITURES PLUS OPENING FUND BALANCE 208,776 TOTAL CASH AVAILABLE 12/31/ ,698 Total 2012 Accounts DFOG - Total 2012 Accounts Payable Pd in 2013 (26,922) Fund Balance 12/31/2012 $ 208,776

12 BLACK DOG WATER MANAGEMENT COMMISSION Budget Performance Report December 31, 2012 unaudited balance as of 02/28/2013 CURRENT MONTH YEAR TO DATE ACTUAL ALLOCATIONS CARRIED FORWARD BUDGET ACTUAL VARIANCE FAVORABLE (UNFAVORABLE) Opening Fund Balance 203,423 $ 203,423 REVENUES : Member Contributions: City of Apple Valley $ - $ - $ 11,679 $ 11,679 $ - City of Burnsville , ,273 - City of Eagan City of Lakeville ,455 21,455 - Total Member Contributions , ,000 - Other Revenues: Interest $ - $ - $ 100 $ 26 $ (74) Contributions (Dakota County) Grant (Metropolitan Council) TMDL Project Total Other Revenue (74) Total Revenues $ - $ - $ 135,100 $ 135,026 $ (74) EXPENDITURES : General Engineering Support $ - $ - $ 33,000 $ 25,287 $ 7,713 Special Projects ,602 41,424 10,179 Insurance - - 3,000 1,719 1,281 Legal and Audit - - 7,950 8,444 (494) Administrative Support 17,199-13,000 17,199 (4,199) Public Education ,600 23,572 (7,972) Water Quality Monitoring ,100 11, Conference/Publications Ferric Chloride Dosing System Contingency - - 5,000-5,000 Total Expenditures 17, , ,673 12,079 EXCESS OF REVENUES OVER EXPENDITURES (17,199) - (6,652) 5,353 EXCESS OF REVENUES OVER EXPENDITURES PLUS OPENING FUND BALANCE 208,776 TOTAL CASH AVAILABLE 12/31/ ,698 Total 2012 Accounts DFOG - Total 2012 Accounts Payable Pd in 2013 (26,922) Fund Balance 12/31/2012 $ 208,776

13 BLACK DOG WMO CASH ACTIVITY REPORT 2013 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 12/31/12 235, Jan Campbell Knutson (2012) Jan Barr Engineering Co (2012) , , , , Jan Metropolitan Council (2012) , , Jan Dakota County Soil & Water (2012) Jan Interest Income /31/13 Balance , , , , , Feb Campbell Knutson Feb Barr Engineering Co , , Feb City of Burnsville (2012) , , Feb Interest Income /29/13 Balance , , , , Total Revenue 5.53 Total Expense 28, , , , , Less: 2012 A/R 0.00 Less: 2012 A/P (26,922.18) (2,490.99) (1,997.98) - (248.00) (17,199.21) (367.50) (4,618.50) Total YTD 2013 Revenue 5.53 Total YTD 2013 Exp 2, , Budget 141, , , , , , , , , , Budget Remaining 139, , , , , , , , , ,000.00

14 Technical Memorandum To: Commissioners, Black Dog Watershed Management Organization From: Barr Engineering Co. Subject: Crystal Lake Water Quality Date: March 12, 2013 Project: 23/ This memorandum presents the results of the BDWMO s 2012 management level (more detailed) monitoring of Crystal Lake. Introduction and Background Crystal Lake is a 292-acre lake located in the cities of Burnsville and Lakeville. The lake is a major recreational resource, with a public beach and public boat landing providing opportunities for swimming, fishing, water skiing, and aesthetic viewing. The mean depth of Crystal Lake is 10 feet, and the maximum depth is 35 feet. The littoral area (area shallow enough for aquatic plants to grow) of the lake is 208 acres. The total watershed area of Crystal Lake is 3,667 acres, including the lake surface area. Several other lakes are also located within the Crystal Lake watershed, including Keller Lake and Lee Lake. Flow from Lee Lake to Crystal Lake only occurs during flood conditions. During the period of , the BDWMO operated a ferric chloride treatment system that ran intermittently on a seasonal basis at Crystal Lake. The system was intended to reduce phosphorus concentrations in Crystal Lake by pumping deep water with elevated phosphorus, adding ferric chloride (a chemical containing iron), and discharging the treated water to nearby Keller Lake. The system was permanently shut down at the end of 2009 due to a combination of factors, including operational costs, limited beneficial impacts, and low water levels in Crystal Lake. Nutrient Impairment and Water Quality Goals Crystal Lake was added to the Minnesota Pollution Control Agency s (MPCA) list of impaired waters in 2002 for nutrient (phosphorus) impairments. As a result, a Total Maximum Daily Load (TMDL) study was required to address the impairment by establishing phosphorus load allocations that would result in the lake meeting water quality standards. During the period of 2008 to 2011, the BDMWO, along with its

15 To: Commissioners, Black Dog Watershed Management Organization From: Barr Engineering Co. Subject: Crystal Lake Water Quality Date: March 12, 2013 Page: 2 Project: 23/ member communities, the MPCA, and other state and local agencies, developed a TMDL report for Crystal Lake. Two other lakes in Crystal Lake s watershed Keller Lake and Lee Lake were also part of the TMDL report. The TMDL established phosphorus load allocations that would achieve water quality goals for Crystal, Keller, and Lee Lakes. The BDWMO member cities continue to implement water quality improvement measures with the goal of removing Crystal, Keller and Lee Lakes from the impaired waters list. The MPCA s lake eutrophication standards consist of numeric standards for Secchi disc transparency (a measure of water clarity), total phosphorus, and chlorophyll a (a measure of algal abundance). The eutrophication standards for a deep lake within the North Central Hardwood Forest ecoregion are included in Table 1. Table 1 MPCA Lake Eutrophication Standards for Deep Lakes in North Central Hardwood Forest Water Quality Parameter MPCA Lake Eutrophication Standard Total Phosphorus (µg/l) 40 Chlorophyll a (µg/l) 14 Secchi Disc Transparency (m) 1.4 Crystal Lake 2012 Water Quality Monitoring Activities According to the BDWMO Watershed Management Plan, Crystal Lake should undergo management level water quality monitoring once every three years. This monitoring program involves collecting more detailed water quality data than collected as part of the Metropolitan Council s Citizen-Assisted Monitoring Program (CAMP), such as collection of water quality parameters at regular depth intervals. Barr Engineering (Barr) staff conducted management level water quality monitoring in 2012 for Crystal Lake. Data collected in 2012 included collecting: Field probe measurements of dissolved oxygen concentration, temperature, specific conductivity, ph, chlorophyll a concentration, and oxidation/reduction potential (ORP) at 1-meter depth intervals. Secchi disc transparency measurements P:\Mpls\23 MN\19\ \WorkFiles\2012_Crystal_Assessment\Memo\2012_Crystal_Summary_Mar docx

16 To: Commissioners, Black Dog Watershed Management Organization From: Barr Engineering Co. Subject: Crystal Lake Water Quality Date: March 12, 2013 Page: 3 Project: 23/ Composite water samples from the surface of Crystal Lake (0-2 meters depth), which were sent to a laboratory for analyses of total phosphorus and chlorophyll a concentrations. Water samples at 1-meter intervals from 3 meters to 8 meters depth, which were sent to a laboratory for analysis of total phosphorus concentrations. Tabulated water quality data collected by Barr in 2012 are included as Attachment A. CAMP water quality data collected in 2012 are included as Attachment B. The Metropolitan Council Environmental Service provided the data, and the data is considered preliminary. Figures 1, 2, and 3 show the summer averages of Secchi disc transparency, total phosphorus, and chlorophyll a, and incorporate data collected by Barr and CAMP. The summer averages shown on Figures 1, 2, and 3 follow the BDWMO Watershed Management Plan convention of calculating summer averages using the time period of the last week of May through the first week of September, roughly corresponding to the Memorial Day through Labor Day summer vacation season that the original University of Minnesota Secchi disc program espoused. This period also precludes observations following fall overturn of thermally stratified lakes, which often imposes an internal phosphorus load that increases total phosphorus concentrations dramatically. This varies from the MPCA s convention of calculating the summer average for the period of June 1 through September 30. The trend for the most recent 10-year period ( ) for all three parameters shows improving water quality in Crystal Lake. The 2012 summer-average total phosphorus concentration was 29 µg/l, which is better than the MPCA standard of 40 µg/l. The 2012 summer-average Secchi disc transparency was 1.7 meters (5.6 feet), which is better than the MPCA deep-lake water quality standard of 1.4 meters (4.6 feet). The 2012 summer-average chlorophyll a concentration was 14.2 µg/l, which is slightly worse than the MPCA standard of 14 µg/l. Internal Loading of Phosphorus A portion of the phosphorus load to Crystal Lake comes from internal recycling from lake sediments. The internal recycling of phosphorus from lake sediment is most pronounced during summer months when the lake is thermally stratified. When the lake is thermally stratified, little to no mixing occurs between surface water and deeper waters of the lake, and the deeper water becomes oxygen depleted. Under low oxygen conditions, a portion of the phosphorus pool in the lake sediments can become remobilized and return to the water column. To help assess the degree to which internal loading of phosphorus was P:\Mpls\23 MN\19\ \WorkFiles\2012_Crystal_Assessment\Memo\2012_Crystal_Summary_Mar docx

17 To: Commissioners, Black Dog Watershed Management Organization From: Barr Engineering Co. Subject: Crystal Lake Water Quality Date: March 12, 2013 Page: 4 Project: 23/ occurring in Crystal Lake in 2012, water quality measurements were collected at 1-meter intervals in addition to the measurements collected at the lake surface ( Attachment A). These measurements indicate dissolved oxygen was depleted below a depth of about 4.5 meters (15 feet) for much of the summer, and total phosphorus concentrations were elevated near the lake bottom due to release from the sediment. Although phosphorus at the lake bottom is not immediately available to phytoplankton growing near the lake surface, some mixing and transport of phosphorus from the lake bottom to water near the surface can still occur when strong winds cause the lake to partially mix. The greatest impact to water quality often occurs in mid- to late-september, when thermal stratification weakens and the lake is more easily mixed, bringing a greater amount of phosphorus from the lake bottom to the surface. Furthermore, the phosphorus that has been released from the sediment is of a dissolved form that is more readily available to phytoplankton. In contrast, a large portion of phosphorus in runoff is of a particulate form that is not as readily available to phytoplankton. Figure 4 shows the phosphorus concentrations measured in Although phosphorus concentrations were somewhat variable over the season, a general trend of increasing phosphorus can be seen from earlysummer to late-summer. It should be noted that two total phosphorus concentrations reported in the CAMP data in mid-september and early October are especially high. Concentrations were 86 and 89 µg/l on September 17 and October 1, respectively. Barr collected a water sample in between these two dates on September 24, and the total phosphorus concentration was 34 µg/l. Although it is expected that phosphorus concentrations at the lake surface would increase in September as the lake turns over, mixing high concentrations of phosphorus near the lake bottom with surface waters, concentrations of phosphorus of 86 and 89 µg/l are especially high. At the time of this memorandum, the 2012 CAMP data are considered preliminary, and it is possible the total phosphorus results for September 17 and October 1 may be found to be erroneous. Figure 5 shows the chlorophyll a concentrations measured in Chlorophyll a concentrations started the summer at a low concentration of 3 µg/l on May 30, 2012, and peaked at concentrations in the range of 19 to 24 µg/l in late-july to mid-august and late September. As chlorophyll a concentrations (and algal abundance) go up, water clarity decreases. This is reflected in Crystal Lake Secchi disc transparency measurements collected in 2012, which steadily decreased from late-may to late-july (see Figure 6). Water clarity remained low through August and much of September. P:\Mpls\23 MN\19\ \WorkFiles\2012_Crystal_Assessment\Memo\2012_Crystal_Summary_Mar docx

18 To: Commissioners, Black Dog Watershed Management Organization From: Barr Engineering Co. Subject: Crystal Lake Water Quality Date: March 12, 2013 Page: 5 Project: 23/ Impact of Time Frame for Determining Summer Averages Water quality measurements collected in 2012 (Figures 4, 5, and 6) demonstrate the general trend that Crystal Lake water quality worsens in late summer (August-September) compared to early summer (late- May through June). Concentrations of total phosphorus were especially high in September for CAMP water samples (preliminary data) collected in The BDWMO Watershed Management Plan calls for the summer-average lake water quality to be calculated using measurements collected from the last week of May to the first week of September. Generally, the MPCA considers data collected from June 1 to September 30 when determining nutrient impairments. Table 2 includes the summer-averages of water quality for the most recent 10-year period, and compares the BDWMO method (May 25 to September 7) with the MPCA method (June 1 to September 30). Because of the higher concentration of total phosphorus and chlorophyll a, and lower Secchi disc transparencies experienced in Crystal Lake in September, the MPCA method results in higher concentration and lower transparencies. Table 2 Comparison of Summer Average Water Quality for Different Date Ranges Date Range: Total Phosphorus Chlorophyll a Secchi Disc Transparency BDWMO 5/25 9/7 (µg/l) (µg/l) (m) MPCA BDWMO MPCA BDWMO 6/1 9/30 5/25 9/7 6/1 9/30 5/25 9/7 MPCA 6/1 9/ yr Average MPCA Eutrophication Standard P:\Mpls\23 MN\19\ \WorkFiles\2012_Crystal_Assessment\Memo\2012_Crystal_Summary_Mar docx

19 To: Commissioners, Black Dog Watershed Management Organization From: Barr Engineering Co. Subject: Crystal Lake Water Quality Date: March 12, 2013 Page: 6 Project: 23/ Summary During the past ten years, the trend in Crystal Lake has been toward greater water transparency, and lower concentrations of phosphorus and chlorophyll a. All these trends are indicative of better water quality and, to some extent, reflect changes in our summer weather. The summer of 2012 brought a continuation of drought-like conditions to Minnesota. According to the Minnesota Climatology Working Group, rainfall totals in many Minnesota counties fell short of average by four or more inches. Less rainfall results in less runoff entering Crystal Lake, and a lower phosphorus load from the watershed. According to the TMDL, stormwater runoff from the watershed accounts for 53 percent of the phosphorus load to Crystal Lake, in an average year. However, internal loading remains a major source of phosphorus in Crystal Lake. Internal sources of phosphorus include curlyleaf pondweed, an invasive non-native aquatic plant which dies off in early summer. Release of phosphorus from lake sediments also occurred in 2012, as indicated by high concentrations of phosphorus in oxygen depleted waters near the lake bottom was also a very warm summer, the third-warmest summer in Twin Cities area history. That encouraged the growth of curlyleaf pondweed, which dies back in early summer, releasing phosphorus into the lake s surface waters and fueling increased algal growth and reduced water transparencies. Hot summer weather during 2012, and its attendant windy conditions, contributed to the expansion of Crystal Lake s upper (warm) water layer, causing it to mix into the bottom (cool) water layer. Mixing of these layers facilitated earlier movement of phosphorus released from oxygen-depleted bottom sediments up into the lake s surface waters. This process also increased late-summer phosphorus concentrations in Crystal Lake somewhat. In earlier, relatively cooler summers, thermal stratification the separation of water layers by temperature difference persisted throughout the summer months, which prevented sediment-released phosphorus from being mobilized into surface waters until early-autumn. P:\Mpls\23 MN\19\ \WorkFiles\2012_Crystal_Assessment\Memo\2012_Crystal_Summary_Mar docx

20 Figures

21 0 Crystal Lake (Burnsville & Lakeville) Summer Average Water Clarity & Trend Analysis 0.0 MPCA Water Quality Standard (1.4 m) 10-Year Trend Secchi Disc Transparency (m) Secchi Disc Transparency (ft) Maximum Lake Depth Not Shown (11.3 m, 37 ft) P:\Mpls\23 MN\19\ \WorkFiles\Trends\2012 Updates\Crystal_1-13.xls 2/11/2013

22 80 Crystal Lake (Burnsville & Lakeville) Summer Average Surface Total Phosphorus Concentrations & Trend Analysis BDWMO Category I & MPCA Deep Lake Year Trend 60 MPCA Water Quality Standard (40 µg/l) Total Phosphorus Concentration (µg/l) P:\Mpls\23 MN\19\ \WorkFiles\Trends\2012 Updates\Crystal_1-13.xls 2/11/2013

23 Crystal Lake (Burnsville & Lakeville) Summer Average Surface Chlorophyll a Concentrations & Trend Analysis BDWMO Category I & MPCA Deep Lake Chlorophyll a Concentration (µg/l) Year Trend 10 MPCA Water Quality Standard (14 µg/l) P:\Mpls\23 MN\19\ \WorkFiles\Trends\2012 Updates\Crystal_1-13.xls 2/11/2013

24 Total Phosphorus (ug/l) Figure 4. Total Phosphorus Concentrations in Crystal Lake, Barr 90 CAMP /1/12 4/1/12 5/2/12 6/2/12 7/3/12 8/3/12 9/3/12 10/4/ Figure 5. Chlorophyll a Concentrations in Crystal Lake, 2012 Barr CAMP Chlorophyll a (ug/l) /1/12 4/1/12 5/2/12 6/2/12 7/3/12 8/3/12 9/3/12 10/4/12 Secchi Disc Transparency (m) Figure 6. Secchi Disc Transparencies in Crystal Lake, /1/12 4/1/12 5/2/12 6/2/12 7/3/12 8/3/12 9/3/12 10/4/ Barr 0.5 CAMP

25 Attachments

26 Attachment A 2012 Tabulated Water Quality Data (collected by Barr)

27 Attachment A Crystal Lake 2012 Water Quality Date Max. Depth (M) Sample Depth (M) Secchi Depth (M) Turbidity (NTU's) Chl. a (µg/l) D.O. (mg/l) Temp. ( C) Sp. Cond. 25 C) Total P (mg/l) ph ORP (mv) 3/27/ /8/ /22/ P:\Mpls\23 MN\19\ \WorkFiles\2012_Crystal_Assessment\2012 Crystal Lake Water Quality Data.xlsx Page 1

28 Attachment A Crystal Lake 2012 Water Quality Date Max. Depth (M) Sample Depth (M) Secchi Depth (M) Turbidity (NTU's) Chl. a (µg/l) D.O. (mg/l) Temp. ( C) Sp. Cond. 25 C) Total P (mg/l) ph ORP (mv) 6/11/ /28/ /16/ P:\Mpls\23 MN\19\ \WorkFiles\2012_Crystal_Assessment\2012 Crystal Lake Water Quality Data.xlsx Page 2

29 Attachment A Crystal Lake 2012 Water Quality Date Max. Depth (M) Sample Depth (M) Secchi Depth (M) Turbidity (NTU's) Chl. a (µg/l) D.O. (mg/l) Temp. ( C) Sp. Cond. 25 C) Total P (mg/l) ph ORP (mv) 7/30/ /14/ /27/ P:\Mpls\23 MN\19\ \WorkFiles\2012_Crystal_Assessment\2012 Crystal Lake Water Quality Data.xlsx Page 3

30 Attachment A Crystal Lake 2012 Water Quality Date Max. Depth (M) Sample Depth (M) Secchi Depth (M) Turbidity (NTU's) Chl. a (µg/l) D.O. (mg/l) Temp. ( C) Sp. Cond. 25 C) Total P (mg/l) ph ORP (mv) 9/10/ /24/ P:\Mpls\23 MN\19\ \WorkFiles\2012_Crystal_Assessment\2012 Crystal Lake Water Quality Data.xlsx Page 4

31 Attachment B 2012 CAMP Water Quality Data

32 Attachment B Attachment B: Crystal Lake 2012 Preliminary CAMP Water Quality Results Secchi Depth (m) Water Temperature ( C) Chlorophyll a* (µg/l) Total Phosphorus (mg/l) Nitrogen, Total Kjeldahl (mg/l) 4/18/ /30/ /14/ /30/ /12/ /25/ /9/ /24/ /6/ /20/ /3/ /17/ /1/ /14/ Notes Chlorophyll a* - Chlorophyll a results are corrected for pheophytin pigment. Page 1

33 City of BURNSVILLE Memo DATE: 2/14/2013 TO: FROM: RE: Brian Johnson, Metropolitan Council CAMP Coordinator Daryl Jacobson, Water Resources Specialist 2013 CAMP Site Request City of Burnsville and Black Dog WMO Below is the list of lakes the City of Burnsville and Black Dog WMO would like to include in the 2013 CAMP Program. Coordinating Agency to New Water Body / DNR ID# Agency Bill Site Alimagnet ( ) Burnsville City of Burnsville No Crystal Lake ( ) Burnsville Black Dog WMO No Earley Lake ( ) Burnsville City of Burnsville No Keller Lake ( ) Burnsville Black Dog WMO No Kingsley Lake ( ) Lakeville Black Dog WMO No Lac Lavon ( ) Apple Valley Black Dog WMO No Orchard Lake ( ) Lakeville Black Dog WMO No Sunset Pond ( ) Burnsville City of Burnsville No Twin Lake South ( ) Burnsville City of Burnsville No Wood Pond ( ) Burnsville City of Burnsville No The contact for the City of Burnsville and the Black Dog WMO will be Liz Forbes (952) The contact at the City of Apple Valley is Jeff Kehrer (952) The contact at the City of Lakeville is Ann Messerschmidt (952) We look forward to working with you again this year. If you have any questions feel free to call me at (952) C: Ann Messerschmidt Jeff Kehrer Liz Forbes

34 Our mission is... To provide leadership in the management and stewardship of the water resources in northwestern Dakota County, Minnesota, through the cooperation of four cities and the involvement of local stakeholders. Evaluating our Success The BDWMO watershed management plan calls for the organization and its member cities to identify outcome-based goals for specific water bodies found within the watershed, and to meet annually to discuss progress toward these goals. The BDWMO uses the following tools to track progress toward goals: Trend Analysis The BDWMO collects water quality information to track water quality trends. Performance Analysis The BDWMO works with the member cities to implement improvement projects, such as water quality treatment, and to measure the success of these projects. Habitat Quality Analysis The BDWMO collects habitat quality data to detect conditions that would trigger a need for management actions. This annual report outlines the BDWMO s goals, progress toward those goals in 2012, and plans for 2013 and beyond. What is the Black Dog Watershed Management Organization? The Black Dog Watershed Management Organization (BDWMO) actively manages surface water, such as that found in lakes, streams, and wetlands, located in the Black Dog and Credit River watersheds within Dakota County. To effectively manage surface water, the BDWMO develops and implements plans that address water quality, responds to drainage issues that cross multiple municipal boundaries, and assists cities within the watershed to manage surface water runoff. The BDWMO is represented by commissioners who are appointed by the cities within the watershed, which include Burnsville, Lakeville, Apple Valley, and Eagan. The total area of the Black Dog watershed is 17,500 acres; 70 percent of the watershed lies within the city of Burnsville, 21 percent of the area is within the city of Lakeville, 8 percent is within the city of Apple Valley, and 1 percent is within the city of Eagan. In this Issue 2012 WMP Adopted... page 2 Water Quality and Weather... page 2 Blue Thumb Program... page 3 Links to Helpful Resources... page 3 Crystal Lake Water Quality... page 4 Monitoring Programs... pages Monitoring Results... pages Income & Expenditures... page 8

35 Progress Toward Healthier Water 2012 Watershed Management Plan Adopted On October 17, 2012, the BDWMO Board of Commissioners adopted the 2012 Watershed Management Plan (2012 Plan). The adoption of the 2012 Plan concludes an intensive planning process begun by the BDWMO in late To promote a transparent and inclusive plan development process, the BDWMO convened a Planning Advisory Group (PAG) including member city staff, review agency staff, citizens from the member cities, BDWMO commissioners, and other stakeholders to participate in the planning process. Following agency review and further revision, the 2012 Plan was ultimately approved by the Minnesota Board of Water and Soil Resources (BWSR) on September 26, The 2012 Plan includes a summary of the BDWMO s history, inventory of water and other natural resources, discussion of issues facing the BDWMO, goals and policies defining the organization s and member cities responsibilities, and an implementation plan outlining the BDWMO s activities over the next 10 years. An important aspect of the project was the incorporation of total maximum daily load (TMDL) studies into the implementation plan. Results from TMDL studies conducted at Crystal, Keller, and Lee Lakes, and a Protection Plan for Earley Lake were all included in the plan. The 2012 Plan strengthens existing policies, but also addresses emerging and evolving topics, including cost allocation for internal load reduction projects. Based on new policies included in the 2012 Plan, the BDWMO s 2013 budget includes the first of annual contributions to a Project Reserve Fund. This fund will serve as a savings account for future internal load reduction projects stemming from TMDLs. The establishment of this fund well in advance of such projects (which cannot be implemented prior to control of upstream external load sources) will allow for a significant head start in financing internal load reduction projects. The 2012 Plan is publicly available from the BDWMO s website at: Mgmt_Plan.pdf Joined at the Hip Water Quality and Weather Late summer and fall of 2012 brought a continuation of drought-like conditions to Minnesota. According to the Minnesota Climatology Working Group, rainfall totals in many Minnesota counties fell short of average by four or more inches (see graph). That s equivalent to the amount of rain that falls in a normal summer month. While this lack of rain brought plenty of brown lawns and drought-stressed trees, it also decreased the amount of polluted stormwater runoff a major source of Crystal Lake s normal phosphorus load (53%, in an average year). Less phosphorus meant fewer algal blooms and betterthan-average water quality. So, while 2012 Crystal Lake water quality was generally good, why weren t the Secchi disc transparency readings even better than those observed in 2011? Well, 2012 was also a very warm summer: the third-warmest summer in Twin Cities area history. That encouraged the growth of curlyleaf pondweed. This exotic weed species dies back in early-summer, releasing phosphorus into the lake s surface waters and fueling increased algal growth and reduced water transparencies. Hot summer weather during 2012, and its attendant windy conditions, contributed to the expansion of Crystal Lake s upper (warm) water layer, causing it to mix into the bottom (cool) water layer. Mixing of these layers facilitated earlier movement of phosphorus released from oxygen-depleted bottom sediments up into the lake s surface waters. This process also increased late-summer phosphorus concentrations in Crystal Lake somewhat. In earlier, relatively cooler summers, thermal stratification the separation of water layers by temperature difference persisted throughout the summer months, which prevented sediment-released phosphorus from being mobilized into surface waters until early-autumn. While you can t control the weather, you can still help improve the quality of the lakes around you by taking steps to reduce polluted stormwater runoff. For more information, refer to the article (page 3) on the Blue Thumb program. Average and monthly precipitation at the Mpls-St. Paul International Airport station. 2

36 Progress Toward Healthier Water Blue Thumb: Improved Water Quality Starting with You Interested in improving water quality where you live? The Blue Thumb program shows you how your home landscaping can help diminish the effects of stormwater runoff and associated pollutants. Blue Thumb is a program of the Dakota County Soil and Water Conservation District (SWCD). The BDWMO provides funding to support the program in the watershed. Participants in the program attend special design workshops to develop site-specific plans for creating native gardens, rain gardens, or native shorelines. This approach to landscaping emphasizes the use of hardy perennials which require no fertilizer, pesticides, or mowing. The result is a reduction in sources of both polluted runoff and air pollution. Participants can submit an application, project plan, and cost estimates to the Dakota County SWCD for grant funds of up to $250. In 2012, 130 homeowners attended Blue Thumb introductory workshops hosted by the BDWMO; 25 went on to design projects and 18 projects within the WMO received construction-funding grants. Up to 18 Blue Thumb projects will also be funded by the BDWMO in Homeowners must attend workshops to apply for grants. Blue Thumb is one of a group of cost-sharing programs offered by the Dakota County SWCD (see table below). For more information, call or go to Program For Who? Award Amounts Project Examples Blue Thumb Dakota County homeowners $250 Native gardens Rain gardens Native shoreline stabilization Conservation Cost Share Dakota County property owners $4,000 (up to 65% of actual project cost) Erosion and slope stabilization; gully, wetland, lake or stream restorations; sediment basins; bioretention practices; shoreline stabilizations Conservation Initiative Funding Program Dakota County property owners wanting to implement conservation practices on commercial or multiple properties; get your neighbors together! $20,000 (up to 65% of actual project cost) Low-impact development practices; stormwater retrofit with best-management practices; erosion and slope stabilization; gully, wetland, lake, or stream restorations; bioretention practices; shoreline stabilizations Community Conservation Partnership Public landowners interested in implementing TMDL and local water management plans $50,000 (up to 65% of actual project cost) Bioretention; Infiltration; filtration soil amendments; rooftop disconnect; reduced impervious surface areas; porous pavements; thermal impact prevention/mitigation; snowmelt treatment; stormwater recycling; best management practices Helpful Resources for Improving Water Quality There are other helpful resources where homeowners can find more information on how they can protect and improve water quality. Below are links to some of this information For septic system owners, it s important to maintain the system to protect water quality. Learn more at the links below: 3

37 Data Guides Management Practices Crystal Lake, Improving Again The BDWMO is pleased to report that Crystal Lake water quality continues to improve. Crystal Lake is a 292-acre lake located in the cities of Burnsville and Lakeville. The 2012 summer-average Secchi disc transparency (a measure of water clarity) was 1.7 meters (5.6 feet), which is better than the MPCA deep-lake water quality standard of 1.4 meters, recently adopted by the BDWMO. This is a continuation of a 10-year ( ) improvement trend. Similar trends toward improved lake water quality are also evident in corresponding records of total phosphorus and chlorophyll a concentrations (a measure of algal abundance). Observed water quality improvements result from management actions taken to reduce phosphorus loads to Crystal Lake and the series of relatively dry weather years we ve experienced (see weather-related info, pg 2). In addition to watershed runoff, a portion of the phosphorus load to Crystal Lake comes from internal recycling from lake sediments. During summer months when the lake is thermally stratified, phosphorus can be released from lake sediments. To help assess the degree to which internal loading of phosphorus was occurring in Crystal Lake in 2012, water quality measurements were collected at 1-meter intervals in addition to the measurements collected at the lake surface. These measurements indicate dissolved oxygen was depleted below a depth of about 4.5 meters (15 feet) for much of the summer, and total phosphorus concentrations were elevated near the lake bottom due to release from the sediment. During the period of , a ferric chloride treatment system operated intermittently on a seasonal basis at Crystal Lake. The system was intended to reduce phosphorus concentrations in Crystal Lake by pumping deep water with elevated phosphorus, adding ferric chloride (a chemical containing iron), and discharging the treated water to nearby Keller Lake. The system was permanently shut down at the end of 2009 due to a combination of factors, including operational costs and low lake-water levels. During the period of 2008 to 2011, the BDMWO, along with its member communities, the MPCA, and other state and local agencies, developed a Total Maximum Daily Load (TMDL) report for Crystal Lake. The TMDL was required because the Minnesota Pollution Control Agency added Crystal Lake to its impaired waters list in Two other lakes in Crystal Lake s watershed Keller Lake and Lee Lake were also part of the TMDL report. The TMDL establishes phosphorus load allocations that would achieve water quality goals for Crystal, Keller, and Lee Lakes. The BDWMO member cities continue to implement water quality improvement measures with the goal of removing Crystal, Keller and Lee Lakes from the impaired waters list. See the BDWMO s 2011 Watershed Annual Report for more information on the Three-Lake TMDL. 4 Habitat Monitoring Program In 2002, the BDWMO created a program for monitoring the habitat quality of strategic water resources in the watershed, including biological and physical indicators, such as upland and aquatic vegetation, buffer zones, erosion, sedimentation, and the presence of non-native exotic species. The program also recommends management actions based upon monitoring results. For the emergent and submergent zones, quality is based on plant diversity, exotic species, and plant density. For the upland buffer, quality is based on vegetation density, exotic species, buffer width, and buffer continuity. In 2010, the BDWMO redesigned the habitat monitoring program and did not conduct monitoring. Beginning in 2011, the program included monitoring each strategic water body on a cycle of once every five years, rather than every water body every year. Orchard Lake was monitored in Monitoring included a meandering survey of the entire lake (in the submergent, emergent, and upland buffer zones). In addition, the plot locations were evaluated and an updated wetland functional assessment was conducted for Orchard Lake. Supplemental photographs were taken to document conditions. Analysis and reporting of the monitoring data was enhanced to include a floristic quality assessment and a four tiered rating system (poor, moderate, high, and excellent). Due to changes in the rating system, comparing the 2012 ratings with previous years may not be appropriate. Private versus public ownership was identified along the entire shoreline. The meandering survey results, along with parcel Modified from: Lakescaping for Wildlife and Water Quality data, are used to identify possible locations for restoration and preservation. See page 7 for Orchard Lake monitoring results. See the BDWMO s website at for full report.

38 2012 Monitoring Results Water Quality Monitoring Program The BDWMO and member cities continued to monitor several of its lakes during 2012 through the Metropolitan Council s Citizen-Assisted Monitoring Program (CAMP) to detect any water quality changes that would require management action by the WMO. In addition, the BDWMO conducted more detailed monitoring on Crystal Lake (see page 4). The monitoring focused on three water quality indicators total phosphorus and chlorophyll a concentrations, plus Secchi disc transparency. All three correlate strongly to the open-water nuisance conditions of lakes (i.e., algal blooms). Long-term monitoring is important because lakes can change from year to year. Only when several years of data are compiled do trends become apparent. Because the MPCA periodically evaluates water quality data from the most recent ten-year period to determine if a lake violates applicable swimmable use standards, the WMO has adopted the same time convention for conducting its annual trend analyses. Graphs on this page and subsequent pages show historic trends in water quality. Crystal Lake Crystal Lake Water Quality Monitoring In 2012, the BDWMO performed more detailed management level monitoring on the lake (see story on page 4). Keller Lake Habitat monitoring is scheduled for Crystal Lake in Keller Lake Water Quality Monitoring Two of the three water quality indicators showed a minor improvement in water quality in 2012 when compared to Transparency readings were higher and chlorophyll a concentrations were slightly lower. Total phosphorus concentrations were higher. Trend analyses were not completed for Keller Lake because there is less than 10 years of data since the ferric chloride treatment system was permanently shut down at the end of The water quality has generally degraded since then. The three-lake TMDL study and implementation plan identifies the water quality improvement measures needed to achieve the BDWMO and MPCA goals for Keller Lake. Habitat monitoring is scheduled for Keller Lake in

39 2012 Monitoring Results Kingsley Lake Water Quality Monitoring Water quality monitoring data from 2012 show continued excellent water quality in Kingsley Lake, with transparency readings at the bottom of the lake.* Chlorophyll a concentrations decreased slightly in 2012 from Total phosphorus concentrations increased in 2012 from 2011, the third year in a row, showing minor degradation in water quality. However, there is still an overall decreasing trend in total phosphorus concentrations over the tenyear period from 2003 to The BDWMO will continue to monitor the water quality of Kingsley Lake. Habitat monitoring is scheduled for Kingsley Lake in *Secchi disc readings in Kingsley Lake are difficult because lake vegetation obscures the Secchi disc, giving false measurements. There is no trend line in the graph to the left because previous measurements are believed to be inaccurate. Kingsley Lake Secchi disc readings should all be on the lake bottom due to its clarity. Lac Lavon Water Quality Monitoring Lac Lavon continues to have excellent water quality. Transparency readings show an improvement in water quality in 2012 when compared to Total phosphorus concentrations decreased slightly in 2012 from 2011, showing a small improvement in water quality. However, chlorophyll a concentrations increased slightly in 2012 from 2011, showing some water quality degradation. The BDWMO will perform more detailed management level monitoring of the lake in Habitat monitoring is scheduled for Lac Lavon in

40 2012 Monitoring Results Orchard Lake Water Quality Monitoring Data from 2012 continue to show very good water quality for Orchard Lake. Although transparency readings decreased slightly and total phosphorus concentrations increased (indicating some water quality degradation), chlorophyll a concentrations decreased slightly, indicating a small improvement in water quality. Habitat monitoring results for 2012 As mentioned in the Habitat Monitoring Program article on page 4, Orchard Lake was monitored in The following determinations were made from the monitoring results. The submergent zone for Orchard Lake is rated moderate due to averaging four criteria. Though the total number of native species in the submergent zone is high (13), the average macrophyte density is rated poor (2.0), the average exotic species density is rated moderate (1.7) and the Coefficient of Conservatism Value (C-Value) Rating is moderate (5.4). Curlyleaf pondweed is a dominant species found every year in early summer within Orchard Lake. This invasive plant often out-competes native vegetation early in the growing season and dies off in early to mid-summer, which creates a sudden loss of habitat and releases nutrients into the water that can produce algal blooms and create turbid water conditions. The City of Lakeville conducts annual herbicide treatments to control curlyleaf pondweed. Orchard Lake has a moderate overall emergent vegetation zone quality rating, due to a diverse assemblage of native plant species (43), moderate coverage of exotic species (51-75%), a moderate mean C-value rating (3.1), and moderate vegetative cover (26-50 percent). Hybrid cattail is the dominant exotic species within the emergent zone, although purple loosestrife is also present in a few locations along the shoreline. Purple loosestrife is a resilient perennial that has little wildlife value. The seeds produced by the plant are low in nutritional value and the roots are too woody to provide a food source for small mammals. The MnDNR continues to manage purple loosestrife beetles to control the spread of the plant. The overall upland buffer quality is rated poor for Orchard Lake. The upland buffer surrounding Orchard Lake provides little wildlife benefit. The upland buffer averages less than 10 feet in width and surrounds less than a quarter of the lake. A total of 19 native species and 20 exotic plant species were observed in the upland buffer area in Exotic plants make up greater than 40 percent of the vegetative cover. The mean C-value rating (1.6) in the upland buffer is poor. The upland buffer is dominated by maintained lawn grasses, which contribute to the degraded wildlife value. No significant erosion or sedimentation problems were noted within the lake. 7

41 Board of Commissioners Representing Burnsville: Roger Baldwin, Chair Loren Knott, Commissioner Tom Harmening, Commissioner Mike Hughes, Alternate Representing Apple Valley and Eagan: Mary Hamann-Roland, Vice Chair Greg Helms, Alternate Representing Lakeville: Scott Thureen, Treasurer/Secretary Tom Goodwin, Alternate Engineering Consultant: Karen Chandler, P.E., Barr Engineering Co. Henry Runke, Ph.D., Barr Engineering Co. Legal Consultant: Roger Knutson, Campbell Knutson, P.A Budget Engineering Fees... $33,000 Legal and Audit Fees... $8,400 Administrative Services... $13,500 Public Education... $15,700 Insurance... $3,000 Special Projects... $25,200 Conference/Publications... $500 Water Quality Monitoring... $13,150 Project Reserve Fund... $17,550 Contingency... $5,000 Total... $135, Income Burnsville 75% Regular board meetings... are held at 5:00 p.m. on the third Wednesday of the month at the Burnsville Maintenance Facility at Frontier Court. For more information, please contact: Eagan <1% Apple Valley 9% Interest 1% 2013 Expenditures Lakeville 16% Daryl Jacobson, Administrator Black Dog WMO City of Burnsville Frontier Court Burnsville, MN Telephone: Fax: Water Quality Monitoring 10% Administration 10% Legal & Audit 6% Engineering 24% Contingency 4% 8 Website: Conferences/ Publications <1% Project Reserve Fund 13% Special Projects 19% Insurance 2% Public Education 12%