Jump to main content.


Local Navigation


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/R05-90/140
ROD Date:  08/30/1990
Operable Unit(s):  01
 
Media:  GROUND WATER
 
Contaminant:  VOCS, TCE
 
Abstract:  THE CLARE WATER SUPPLY SITE IS THE PUBLIC WATER SUPPLY SYSTEM FOR THE CITY OF CLARE, CLARE COUNTY, MICHIGAN. THE CLARE WATER SUPPLY SYSTEM WITHDRAWS GROUND WATER FROM FOUR MUNICIPAL WELLS (MW) IN THE SITE WELLFIELD, EACH TAPPING AN UNCONSOLIDATED SAND AQUIFER. IN 1981, GROUND WATER SAMPLING REVEALED CONTAMINANTS INCLUDING CHLORINATED HYDROCARBONS IN TWO OF THE WELLS (MW #2 AND MW #5) IN THE NORTHEASTERN PORTION OF THE SITE. AN INDUSTRIAL AREA CONTAINING APPROXIMATELY 14 MANUFACTURING AND RETAILING BUSINESSES OPERATES WEST OF THE CONTAMINATED WELLS. SOIL SAMPLES EXTRACTED FROM THIS INDUSTRIAL AREA INDICATE SOIL CONTAMINATED WITH TCE AND DCE. IN ADDITION, A NEARBY SETTLING LAGOON CONTAINS SOLVENTS AND HEAVILY CONTAMINATED SEDIMENTS. EPA CONDUCTED A SHORT-TERM STUDY THAT DETERMINED THAT THE MAJOR SOURCE OF GROUND WATER CONTAMINATION RESULTED FROM CONTAMINANTS LEACHING OUT OF SOIL ON THE INDUSTRIAL PROPERTIES, ENTERING A SHALLOW PERCHED AQUIFER, AND MIGRATING TO THE DEEPER AQUIFER THAT SERVES THE MUNICIPAL WELLFIELD. THE CLARE WATER SUPPLY WELLFIELD IS THE SOLE SOURCE OF DRINKING WATER FOR THE COMMUNITY. REMEDIAL ACTIONS FOR THIS SITE WILL FOCUS ON TWO OPERABLE UNITS. THE FIRST, OPERABLE UNIT ONE (OU1), AN INTERIM REMEDY ADDRESSING TCE CONTAMINATION OF THE DRINKING WATER SUPPLY, WILL BE IMPLEMENTED IN THIS RECORD OF DECISION (ROD). A SUBSEQUENT ROD WILL ADDRESS OU2, THE REMAINING GROUND WATER CONTAMINANTS AS WELL AS SOIL CONTAMINATION. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER ARE VOCS INCLUDING TCE.

THE SELECTED REMEDIAL ACTION FOR THIS INTERIM REMEDY INCLUDES INSTALLING AND OPERATING AN AIR STRIPPER TO TREAT THE GROUND WATER, MODIFYING PIPELINES ON THE EXISTING WATER SUPPLY SYSTEM, MONITORING TREATED WATER FROM THE AIR STRIPPER PRIOR TO ITS RELEASE INTO THE WATER SUPPLY SYSTEM, AND MONITORING AIR EMISSIONS FROM THE AIR STRIPPER. THE ESTIMATED PRESENT WORTH COST FOR THIS INTERIM REMEDIAL ACTION IS $1,284,059, WHICH INCLUDES AN ANNUAL O&M COST OF $61,000 FOR 30 YEARS.

PERFORMANCE STANDARDS OR GOALS: THIS ROD WILL REMEDIATE GROUND WATER TCE AND TCE-DEGRADATION COMPONENTS TO MEET SAFE DRINKING WATER ACT MCLS INCLUDING TCE 5.0 UG/L. ADDITIONAL CHEMICAL-SPECIFIC GROUND WATER GOALS WILL BE DETERMINED IN THE SUBSEQUENT ROD.
 
Remedy:  THIS INTERIM ACTION OPERABLE UNIT IS THE FIRST OF TWO OPERABLE UNITS FOR THE SITE. THIS OPERABLE UNIT ADDRESSES CONTAMINATION OF DRINKING WATER BY ELIMINATING OR REDUCING THE RISKS, THROUGH TREATMENT AND ENGINEERING CONTROLS, POSED BY THE DISTRIBUTION OF CONTAMINATED DRINKING WATER. THE SECOND OPERABLE UNIT WILL ADDRESS CONTAMINATED SOILS AND GROUNDWATER AND WILL BE THE FINAL RESPONSE ACTION AT THE SITE.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE:

* INSTALLATION AND OPERATION AND MAINTENANCE OF AN AIR STRIPPER AND MINOR PIPING OR POWER SUPPLY MODIFICATIONS TO THE EXISTING SYSTEM; AND
* MONITORING OF WATER TREATED BY THE AIR STRIPPER PRIOR TO RELEASE INTO THE DISTRIBUTION SYSTEM. INLET WATER TO THE AIR STRIPPER WILL ALSO BE MONITORED ON A REGULAR BASIS FOR CONTAMINANT CONCENTRATIONS TO ENSURE AIR EMISSIONS BEING STRIPPED OFF THE WATER ARE WITHIN AN ACCEPTABLE RANGE.
 
Text:  View full-text ROD [ 28K ]
To download a full-text ROD, right click on the above link and select Save Link As. A full-text ROD is in PDF format. Please note that download time may be extended given the size of the full-text document. File size is noted in kilobytes (K) or megabytes (M) next to the download link.
About Adobe Portable Document Format
 
Return to Search Results   

OSWER Home | Superfund Home


Jump to main content.