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Record of Decision System (RODS)

CLARE WATER SUPPLY

Abstract

Site Name:  CLARE WATER SUPPLY
Address:  CITY HALL 202 W 5TH ST 
City & State:  CLARE  MI  48617
County:  CLARE
 
EPA ID:  MID980002273
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-92/209
ROD Date:  09/16/1992
Operable Unit(s):  02
 
Media:  Soils, Sediment, Ground Water
 
Contaminant:  VOCs
 
Abstract:  SITE HISTORY/DESCRIPTION: The Clare Water Supply site is a municipal well field in the City of Clare, Clare County, Michigan. Land use in the area is predominantly commercial, industrial, and residential with wetlands neighboring the site. In addition, a drainage ditch runs though an industrial area directly northwest of the site across the well field, discharges into the wetlands, and recharges the underlying aquifer. An estimated 3,300 residents of Clare use the municipal water supply as their drinking water supply. In 1981, state investigations of the municipal wells showed VOC contamination in the ground water. In 1982, soil samples taken during the installation of monitoring wells showed soil contamination from seven industrial facilities bordering the well field and attributed contamination of the shallow perched aquifer to theleaching of contaminants from these areas. A 1990 interim action ROD for the site provided for air stripping to remove VOCs from the city's water supply. The air strippers were installed and began operating in 1991. This ROD addresses the contaminated soil, sediment, and ground water as a final remedial action for the site. The primary contaminants of concern affecting the soil, sediment, and ground water are VOCs, including benzene, PCE, TCE, and xylenes. PERFORMANCE STANDARDS OR GOALS: Chemical-specific soil clean-up goals are based on protection of ground water and include benzene 20 ug/kg; vinyl chloride 0.4 ug/kg; TCE 60 ug/kg; PCE 14 ug/kg; methylene chloride 100 ug/kg; trans-1,2-DCE 2,000 ug/kg; cis-1,2-DCE 1,400 ug/kg; xylenes 6,000 ug/kg; toluene 20,000 mg/kg; ethylbenzene 1,000 mg/kg; 1,1-DCA 14,000 mg/kg; 1,2-DCA 8 mg/kg; 1,1,2-TCA 12 mg/kg; 1,1,1-TCA 4,000 mg/kg; and styrene 20 mg/kg. Chemical-specific ground water clean-up goals are based on SDWA MCLs, and State MCLs under Michigan's Act 307 Type B Cleanup Levels and include benzene 1 mg/l; vinyl chloride 0.02 mg/l; TCE 3 mg/l; PCE 0.7 mg/l; methylene chloride 5 mg/l; trans-1,2-DCE 100 mg/l; cis-1,2-DCE 70 mg/l; xylenes 300 mg/l; toluene 800 mg/l; ethylbenzene 70 mg/l; 1,1-DCA 700 mg/l; 1,2-DCA 0.4 mg/l; 1,1,2-TCA 0.6 mg/l; 1,1,1-TCA 200 mg/l; and styrene 1 mg/l. INSTITUTIONAL CONTROLS: Deed and/or ground water use restrictions will be implemented to limit access to contaminated soil areas and use of contaminated ground water until the remedial action objectives are achieved.
 
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes dewatering and treating 54,800 cubic yards of contaminated soil and sediment, including the soil under buildings, using in-situ vapor extraction (ISVE) to remove VOCs; treating air emissions from the ISVE process using granular activated carbon; returning spent carbon units to the supplier for offsite regeneration; possibly enhancing the effectiveness of the remedy with limited excavation of hot spots, where SVE may not be practicable, temporarily capping treated areas, or adding nutrients, based on the results of pre-design studies; extracting and treating contaminated ground water onsite using UV/chemical oxidation, with reinjection of the treated ground water into the aquifer; treating water from the dewatering process using carbon adsorption prior to discharge; monitoring ground water; and implementing institutional controls, including deed and ground water use restrictions. The estimated present worth cost for this remedial action is $11,754,247, which includes an average annual O&M cost of $431,183 for 30 years.
 
Text:  View full-text ROD [ 65K ]
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