TCMA Chloride Management Plan - TCMA Chloride Conditions - TMDL summary
The Total Maximum Daily Loads (TMDLs) were developed for each of the lakes, wetlands and streams in the TCMA impaired for chloride, with the exception of Shingle Creek and Nine Mile Creek which already have existing TMDLs. A TMDL quantifies the allowable pollutant loading to a lake, wetland, or stream that will result in water quality standards being attained. The water quality target for the TMDLs was set to the chronic water quality criterion for chloride of 230 mg/L. The total allowable load, or TMDL, is allocated to the various sources contributing chloride as well as consideration of a margin of safety and reserve capacity. Margin of safety is intended to account for uncertainty in the development of the TMDL. Reserve capacity is intended to set-aside a portion of the TMDL for future growth. For the TCMA chloride TMDLs, reserve capacity was set to zero assuming that any further development and additional impervious surfaces would be expected to have the same level of best management practices (BMPs) implemented for winter maintenance activities as for the remainder of the watershed. The complete details of the TMDL development are presented in the TCMA Chloride TMDL report (see Appendix A).
A total of 39 waterbodies are listed as impaired by chloride, and TMDLs for Shingle Creek and Nine Mile Creek have already been prepared under separate projects. A total of 37 TMDLs were completed as part of this project. Summaries of the TMDLs are presented in the following tables.
Summary of TMDL and Components for Impaired Lakes and Wetlands in the TCMA
Link to this table
| Lake/Wetland | AUID | Watershed Area (ac) | TMDL and Components (all values in lbs/yr of chloride) | |||||
|---|---|---|---|---|---|---|---|---|
| Loading Capacity (TMDL | WLA | LA | Margin of Safety | |||||
| MS4 Categorical | Wastewater Sources1 | Non-Permitted Aggregate | Natural Background | |||||
| Battle Creek Lake | 82-0091-00 | 4,326 | 2,153,699 | 1,766,033 | 0 | 0 | 172,296 | 215,370 |
| Brownie Lake | 27-0038-00 | 452 | 341,418 | 279,963 | 0 | 0 | 27,313 | 34,142 |
| Carver Lake | 82-0166-00 | 2,242 | 1,071,123 | 878,321 | 0 | 0 | 85,690 | 107,112 |
| Como Lake | 62-0055-00 | 1,850 | 994,078 | 815,144 | 0 | 0 | 79,526 | 99,408 |
| Diamond Lake | 27-0022-00 | 744 | 486,017 | 398,534 | 0 | 0 | 38,881 | 48,602 |
| Kasota Ponds North | 62-0280-00 | 10 | 6,234 | 5,112 | 0 | 0 | 499 | 623 |
| Kasota Ponds West | 62-0281-00 | 6 | 5,742 | 4,708 | 0 | 0 | 459 | 574 |
| Kohlman Lake | 62-0006-00 | 7,533 | 4,839,183 | 3,106,733 | 1,050,484 | 0 | 303,096 | 378,870 |
| Little Johanna Lake | 62-0058-00 | 1,703 | 1,224,242 | 1,003,879 | 0 | 0 | 97,939 | 122,424 |
| Loring Pond (South Bay) | 27-0655-02 | 34 | 9,764 | 8,007 | 0 | 0 | 781 | 976 |
| Mallard Marsh | 62-0259-00 | 16 | 9,851 | 8,077 | 0 | 0 | 788 | 985 |
| Parkers Lake | 27-0107-00 | 1,064 | 1,431,262 | 528,161 | 787,163 | 0 | 51,528 | 64,410 |
| Peavey Lake | 27-0138-00 | 776 | 205,995 | 165,889 | 3,692 | 0 | 16,184 | 20,230 |
| Pike Lake | 62-0069-00 | 5,735 | 3,591,268 | 2,943,971 | 1,059 | 0 | 287,217 | 359,021 |
| Powderhorn Lake | 27-0014-00 | 332 | 218,588 | 179,242 | 0 | 0 | 17,487 | 21,859 |
| Silver Lake | 62-0083-00 | 655 | 370,011 | 303,409 | 0 | 0 | 29,601 | 37,001 |
| South Long Lake | 62-0067-02 | 114,785 | 26,334,624 | 21,534,261 | 4,030 | 0 | 2,106,448 | 2,633,059 |
| Spring Lake | 27-0654-00 | 39 | 15,600 | 12,792 | 0 | 0 | 1,248 | 1,560 |
| Sweeney Lake | 27-0035-01 | 2,439 | 1,456,271 | 1,194,142 | 0 | 0 | 116,502 | 145,627 |
| Tanners Lake | 82-0115-00 | 1,732 | 826,520 | 677,746 | 0 | 0 | 66,122 | 82,652 |
| Thompson Lake | 19-0048-00 | 178 | 134,340 | 110,159 | 0 | 0 | 10,747 | 13,434 |
| Valentine Lake | 62-0071-00 | 2,404 | 1,165,072 | 955,359 | 0 | 0 | 93,206 | 116,507 |
| Wirth Lake | 27-0037-00 | 426 | 1,095,000 | 897,900 | 0 | 0 | 87,600 | 109,500 |
1 WLA=0 in the wastewater sources column means that there is no wastewater discharges in that watershed
Summary of TMDL and Components for Impaired Streams in the TCMA
Link to this table
| Stream | AUID | Watershed Area (ac) | TMDL and Components (all values in lbs/yr of chloride) | |||||
|---|---|---|---|---|---|---|---|---|
| Loading Capacity (TMDL | WLA | LA | Margin of Safety | |||||
| MS4 Categorical | Wastewater Sources1 | Non-Permitted Aggregate | Natural Background | |||||
| Bass Creek | 07010206-784 | 5,434 | 1,746,399 | 1,432,047 | 0 | 0 | 139,712 | 174,640 |
| Bassett Creek | 07010206-538 | 25,209 | 9,334,219 | 6,642,961 | 1,233,048 | 0 | 648,094 | 810,117 |
| Battle Creek | 07010206-592 | 7,246 | 2,328,721 | 1,909,551 | 0 | 0 | 186,298 | 232,872 |
| Elm Creek | 07010206-508 | 66,382 | 21,332,410 | 17,386,888 | 0 | 105,688 | 1,706,593 | 2,133,241 |
| Judicial Ditch 2 | 07030005-525 | 1,587 | 510,115 | 418,294 | 0 | 0 | 40,809 | 51,011 |
| Minnehaha Creek | 07010206-539 | 109,151 | 35,997,083 | 28,679,140 | 1,004,128 | 0 | 2,806,140 | 3,507,675 |
| Raven Stream | 07020012-716 | 42,750 | 15,023,193 | 442,771 | 1,284,983 | 10,822,561 | 1,099,057 | 1,373,821 |
| Raven Stream, East Branch | 07020012-543 | 14,751 | 6,025,349 | 442,093 | 1,284,983 | 3,445,007 | 379,229 | 474,037 |
| Rush Creek, South Fork | 07010206-732 | 13,844 | 4,470,069 | 3,646,696 | 21,010 | 1,532 | 355,925 | 444,906 |
| Sand Creek (South) - includes 07020012-662 | 07020012-513 | 175,578 | 59,480,179 | 4,402,547 | 3,056,425 | 41,864,932 | 4,513,900 | 5,642,375 |
| Unnamed creek (Headwaters to Medicine Lk) | 07010206-526 | 6,447 | 2,071,959 | 1,699,006 | 0 | 0 | 165,757 | 207,196 |
| Unnamed creek (Unnamed ditch to wetland) | 07010206-718 | 793 | 254,852 | 208,979 | 0 | 0 | 20,388 | 25,485 |
| Unnamed Stream (Unnamed lk 62-0205-00 to Little Lk Johanna) | 07010206-909 | 1,627 | 522,817 | 428,710 | 0 | 0 | 41,825 | 52,282 |
1 WLA=0 in the wastewater sources column means that there is no wastewater discharges in that watershed
This page was last edited on 23 November 2022, at 16:50.