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Record of Decision System (RODS)



Address:  200 W LAKE ST 
City & State:  PETOSKEY  MI  49770
County:  EMMET
EPA ID:  MID006013049
EPA Region:  05
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-95/274
ROD Date:  06/14/1995
Operable Unit(s):  01
Media:  groundwater, soil
Contaminant:  Arsenic, cis-1,2-dichloroethene, trans-1,2-dichloroethene, methyl-t
Abstract:  Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It i not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.

The Petoskey Municipal Well Field site is located in Petoskey, Michigan. The City is located in the northwest corner of Michigan's lower peninsula. The site includes contaminated source area soils and the groundwater that has been affected by contaminants migrating from the source area. Groundwater contamination has affected the Ingalls Avenue Municipal Well (Ingalls Well) whic is located on the shore of Lake Michigan and supplies water to residents of Petoskey.

The Petoskey Manufacturing Company (PMC) has been identified as the source area for the volatile organic compound (VOC) contamination in the Ingalls Well. PMC is a small fabricating operation that was established in 1946 as a die cast manufacturer, continued with painting operations in the late 1960s, and remains in operation today.

The PMC source area is located approximately 500 feet south of Little Traverse Bay. Groundwater from the PMC source area moves towards the bay and into Lake Michigan and also moves toward the Ingalls Well when the well is pumping. The Bear River is located approximately 500 feet east of the PMC site.

Disposal of spent solvents and/or paint sludge on the ground surface outside the PMC building has contaminated soils and groundwater in the vicinity of the sourc area. Water from the Ingalls Well contains VOCs, including trichloroethene (TCE), and low levels of semi-volatile organic compounds (SVOCs) and inorganic contaminants. The Ingalls Well is still being used to service the population of Petoskey and supplies 60 to 70% of the city's water needs.

The selected remedial action is an interim remedy for the site. The purpose of this remedy is to ensure that individuals drinking water from the Ingalls Well are not exposed to unacceptable levels of contamination from the Petoskey Manufacturing Company source area.
Groundwater contamination in the well field will be addressed in a subsequent Record of Decision.
Remedy:  The selected remedy includes on-line treatment of groundwater from the Ingalls Avenue Municipal Well. Air stripping has been identified as the appropriate treatment technology to address the levels and types of contamination seen to date in groundwater and near the well. To address State of Michigan concerns that site-related semi-volatile contamination could adversely impact the Ingalls Well in the near future, the ROD also includes carbon treatment as a contingent treatment remedy. There will be quarterly sampling at the Ingalls Well tap for period of eighteen months from the date of this ROD. If during this eighteen month period, two consecutive quarters of sampling at the Ingalls well tap revea a site-related, semi-volatile contaminant exceeding a maximum contaminant level, the selected remedy will utilize granular activated carbon, instead of air stripping, for treatment of the water supply. If the Ingalls Well is replaced and the replacement supply is in operation within eighteen months of the signature of this ROD, the contingent carbon treatment remedy would no longer be available and quarterly sampling at the Ingalls Well would be discontinued.
Text:  View full-text ROD [ 165K ]
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