Michigan Part 201 Sediment Quality Assessments

The Michigan Department of Environmental Quality (MDEQ) considers contaminated groundwater venting to surface water a significant threat to the State’s surface water quality. During 1995, and more recently, during 2002, the MDEQ promulgated rules under Part 201 of the Natural Resources and Environmental Protection Act, (NREPA; of 1994, as amended) to regulate the discharge of contaminated groundwater to surface waters of the State. Part 201 requires that if a remedial action proposes to allow groundwater to vent to surface water from a facility above generic groundwater/surface water interface (GSI) criteria, then the discharge must comply with the requirements of Part 31 of the NREPA.

GLEC has developed a full suite of capabilities to assist clients with Michigan Part 201 compliance. These capabilities include:
  • Development of Monitoring and Sampling Strategies
  • Site Inspection and Work Plan Preparation
  • Sample Collection from Lakes, Reservoirs, and Tributaries
  • Vibracore Sediment Sampling
  • Fish, Macroinvertebrate, and Habitat Evaluations
  • Whole Sediment Toxicity Testing
  • Surface Water Toxicity Testing
  • Analysis of Existing Sediment Quality Data
  • Sediment (and Surface Water) Chemical Transport Modeling
  • Criteria Development
  • Report Preparation

Our extensive experience serving both the regulated and regulatory communities assures GLEC clients benefit from credible and cost-effective solutions to regulatory concerns.

For more information contact:

John Barkach

Senior Program Manager/Hydrogeologist




GLEC operates one of only a few U.S. laboratories accredited for whole sediment toxicity testing. GLEC also maintains NELAP accreditation for chlorophyll and nutrient chemistry testing.


GLEC's Columbus, OH laboratory is ADEQ accredited for Acute Toxicity and Chronic Toxicity testing.



Great Lakes Environmental Center

739 Hastings Street
Traverse City, MI   49686

Phone: (231) 941-2230
Fax: (231) 941-2240