TCMA Chloride Management Plan - TCMA Chloride Conditions - Protection of surface and groundwater TCMA Chloride Management Plan - TCMA Chloride Conditions - Protection of surface and groundwater

Protection of surface and groundwater

Protection is an opportunity to prevent waters from continued degradation which may result in impairment. Prevention or protection is often more easily accomplished than the restoration of an impaired waterbody. Protection efforts also may eliminate the need for additional permit and other regulatory requirements to reduce pollution. Successful protection efforts rely on understanding how current practices or conditions may be contributing to water quality conditions.

High risk surface waters

Preventing a waterbody from being contaminated with chloride is easier and more cost effective than restoration. Chloride is a conservative ion and will not break down over time but rather it accumulates in waters. Therefore, efforts should be made to protect waters that show an increasing trend in chloride concentration or have been shown to have chloride concentrations approaching the water quality criteria. Lakes, wetlands, or streams with at least one sample within 10% of the chronic water quality standard within the last 10 years have been identified as a high risk waterbody (one exceedance of 207 mg/L chloride). Proactive actions to reduce chloride loads to these high risk waterbodies should be pursued. Proactive actions similar to actions listed for impaired waters should be explored to protect high risk waters. These waters are considered to be approaching the water quality standard and if no actions are taken, they will likely reach impairment status in the near future. The TCMA lakes and streams identified as being at high risk for potential chloride impairment are shown in the High Risk Lakes in the TCMA table and the High Risk Streams in the TCMA table, respectively.

It should be noted that there are potentially many more high risk waters in the TCMA that have not been identified because there is limited or no monitoring data available for those waters. For this reason, similar proactive approaches to chloride management should be taken to prevent chloride contamination.

All surface waters and groundwater

In addition to the high risk waters listed above, protecting all surface waters and groundwater from further degradation due to chloride is important. By implementing salt reducing practices throughout the TCMA, both the need to restore those waters already impaired and also protect those waters not yet exceeding the standard are addressed. The practices necessary for protection of groundwater are the same as those for restoring and protecting surface waters. Through targeting and prioritization a starting point can be established. Management practices and BMPs used for impaired and high risk waters can be the same for all waterbodies and should provide the same level of protection and chloride reduction.

High risk lakes in the TCMA
Link to this table

Lakes	AUID
Beaver Lake	62-0016-00
Bennett Lake	62-0048-00
Calhoun Lake	27-0031-00
Centerville Lake	02-0006-00
Crosby Lake	62-0047-00
Crystal Lake	27-0034-00
Fish Lake	19-0057-00
Gervais Lake	62-0007-00
Hiawatha Lake	27-0018-00
Johanna Lake	62-0078-00
Keller Lake (Main)	62-0010-02
Lake Of The Isles	27-0040-00
McCarron Lake	62-0054-00
Medicine Lake	27-0104-00
Ryan Lake	27-0058-00
Taft Lake	27-0683-00
Unnamed Lake	62-0278-00
Wabasso Lake	62-0082-00
Wakefield Lake	62-0011-00

High risk streams in the TCMA
Link to this table

Streams	AUID
Bevens Creek	07020012-718
Bluff Creek	07020012-710
Classen Lake Creek	07010206-703
Clearwater Creek	07010206-519
County Ditch 17 (Spring Brook)	07010206-557
Credit River	07020012-517
Diamond Creek	07010206-525
Dutch Lake Outlet	07010206-678
Fish Creek	07010206-606
Painter Creek	07010206-700
Rush Creek	07010206-528
Unnamed Creek	07010206-704
Unnamed Creek	07010206-740
Unnamed Creek (Pleasure Ck)	07010206-594
Unnamed Stream (Perro Ck)	07030005-612
Unnamed Stream (Sand Ck)	07010206-744
Unnamed Stream (Trib To Long Lk) (Furgala Creek)	07030005-765
Unnamed Stream In Plymouth	07010206-738
Unnamed Stream Receiving Wtr From Medicine Lk	07010206-785