2019 Ford and Belleville Lakes Total Phosphorus TMDL ① Existing Ford and Belleville Lake Total Maximum Daily Load (TMDL) ② 2018 Court Ruling and TMDL revision timeline ③ TMDL development/Current Conditions ④ Remaining timeline Michigan DEQ, April 9, 2019
2019 Ford and Belleville Lakes Total Phosphorus TMDL ① Existing Ford and Belleville Lake TMDL TMDLs are developed for water bodies that do not meet water quality standards Ford and Belleville Lakes have historic and ongoing nuisance algae blooms and are not meeting WQS “The primary purpose of the TMDL program is to protect public health and the health of impaired ecosystems.” USEPA
2019 Ford and Belleville Lakes Total Phosphorus TMDL ① Existing Ford and Belleville Lake TMDL Current USEPA approved Ford and Belleville TMDL TP goal of 30 ug/l for Belleville Lake was established by the Michigan Water Resources Commission in 1987 to reduce nuisance algae blooms Severe summer algae blooms, typically of cyanobacteria (blue- green algae) tend to occur at concentrations above 30 ug/l Loading capacity was expressed as a phosphorus concentration of 50 ug/l on the Huron River upstream of Ford Lake
2019 Ford and Belleville Lakes Total Phosphorus TMDL ② 2018 Court Ruling and TMDL revision timeline October 3, 2018 Appeals Court ruling stated: “Appellee will re-evaluate and will propose revisions to the TMDL” Initial order required TMDL to be submitted to EPA by 12/3/2018. Revised agreed upon deadline is 7/3/2019 (9 month project)
2019 Ford and Belleville Lakes Total Phosphorus TMDL ③ TMDL development/Current Conditions TMDL revision includes Technical review of existing files/data Evaluate geographic scope of the TMDL watershed Obtain and review external data Analyzed DEQ data collected since 2014 Evaluate current TMDL goal Develop new loading capacity (WLA and LA) Write TMDL
2019 Ford and Belleville Lakes Total Phosphorus TMDL ③ TMDL development/Current Conditions New TMDL content will be updated to current format TMDL ‘watershed’ will likely be the same, but recognize Upper Huron TP load Goals for the lakes will be set to ensure the lakes meet WQS WLA will include the current NPDES permits (including regulated stormwater) New TMDL will use existing data from all available sources to the best of our ability.
Huron on R River r – Michiga gan A Ave: mean monthly TP 180 160 140 Total Phosphorous (ug/L) April 120 May 100 June 80 July August 60 September 40 20 0 1994 1995 1996 1997 1998 1999 2001 2002 2003 2004 2005 2006 2009 2012 2014 2016 2018
Ford Lak Lake: mean monthly TP 160 140 120 Total Phosphorous (ug/L) April 100 May June 80 July August 60 September 40 20 0 1994 1995 1996 1997 1998 1999 2001 2002 2003 2004 2005 2006 2009 2012 2014 2016 2018
Bel elleville L e Lake: e: mean monthly TP 180 160 140 120 April May Total Phosphorous (ug/L) 100 June 80 July August 60 September 40 20 0 1994 1995 1996 1997 1998 1999 2001 2002 2003 2004 2005 2006 2009 2012 2014 2016 2018
2019 Ford and Belleville Lakes Total Phosphorus TMDL ③ TMDL development/Current Conditions 2015 and 2018 algae blooms on both lakes reported to DEQ Oct 2017 Oakland University study found bloom in Belleville Lake with low levels of microcystin Ford Lake Cyanobacteria blooms throughout Sept 2018 Microcystin levels high, up to 1300 ug/L in scums Belleville Lake Cyanobacteria blooming or present in Sept 2018 Microcystin present but low, except for Sept 12 (700 and 120 ug/L)
Belleville Lake 9/2018
2019 Ford and Belleville Lakes Total Phosphorus TMDL ③ TMDL development/Current Conditions DEQ Dissolved Oxygen Monitoring: 2014-No signs of anoxia 2016-Ford: July, August; Belleville: June, July, August 2018-Ford: July, August; Belleville: June, July, August Bottom TP on the above dates ranged from 31-800 ug/L (avg 200 ug/L) Draft TMDL will likely include internal load in the Load Allocation
2019 Ford and Belleville Lakes Total Phosphorus TMDL ③ TMDL development/Current Conditions Court Order agreed that the “… science involved with artificial mixing could provide a basis for lowering the phosphorus limits contained in the permits.” EPA requires targets that will ensure WQS will be met without need for other management Ongoing evidence of lake bottom anoxia, algal blooms, and elevated phosphorus concentrations in Ford and Belleville Lakes
2019 Ford and Belleville Lakes Total Phosphorus TMDL ④ Remaining timeline Draft TMDL public noticed planned in May 30 day comment period Short turn around time to make revisions Submit TMDL to EPA by July 3, 2019 Ford Lake 9-19-2018
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