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Record of Decision System (RODS)

ALGOMA MUNICIPAL LANDFILL

Abstract

Site Name:  ALGOMA MUNICIPAL LANDFILL
Address:  SEC32 T25N R25E TOWN OF AHNAPEE 
City & State:  ALGOMA  WI  54201
County:  KEWAUNEE
 
EPA ID:  WID980610380
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-90/145
ROD Date:  09/29/1990
Operable Unit(s):  01
 
Media:  Debris, Groundwater, Soil
 
Contaminant:  VOCS, BENZENE, OTHER ORGANICS, METALS, ARSENIC
 
Abstract:  THE 13-ACRE ALGOMA MUNICIPAL LANDFILL SITE IS AN INACTIVE MUNICIPAL LANDFILL IN ALGOMA, KEWAUNEE COUNTY, WISCONSIN. SURROUNDING LAND USE IS PRIMARILY AGRICULTURAL/RURAL RESIDENTIAL WITH WETLANDS ADJACENT TO THE SITE. THE SITE OVERLIES AN AQUIFER THAT CURRENTLY SUPPLIES WATER TO PRIVATE WELLS. FROM 1969 TO 1983, THE SITE WAS OPERATED AS A MUNICIPAL LANDFILL COMPRISED OF 3 DISTINCT LANDFILL AREAS. SOLVENTS, THINNERS, LACQUERS, AS WELL AS MUNICIPAL WASTES WERE REPORTEDLY DISPOSED OF IN THE MAIN LANDFILL AREA KNOWN AS THE LANDFILL DISPOSAL AREA (LDA). TWO SMALLER AREAS, THE NORTH DISPOSAL AREA (NDA) AND THE SOUTH DISPOSAL AREA (SDA) WERE REPORTEDLY USED FOR THE DISPOSAL OF CONSTRUCTION DEBRIS AND ASBESTOS-CONTAMINATED SLUDGE. APPROXIMATELY 400,000 CUBIC YARDS OF MUNICIPAL WASTES WERE DISPOSED OF AT THE SITE. IN 1983, THE LANDFILL WAS CLOSED AND THE WASTES WERE COVERED. HOWEVER, OVER TIME, THE CAP HAS DETERIORATED DUE TO WEATHER AND LACK OF PROTECTION FROM FREEZING AND THAWING. THEREFORE, THE CURRENT COVER HAS NOT BEEN IMPERMEABLE AND LANDFILL CONTAMINANTS HAVE BEEN RELEASED INTO THE GROUND WATER. EPA SITE INVESTIGATIONS CONDUCTED IN 1984 AND 1989 REVEALED ONSITE GROUND WATER CONTAMINATION CAUSED BY SOURCES LEACHING FROM THE LDA. THIS RECORD OF DECISION (ROD) ADDRESSES THE REMEDIATION OF CONTAMINATED SOURCE AND GROUND WATER. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER, SOIL, AND DEBRIS ARE VOCS INCLUDING BENZENE; OTHER ORGANICS; AND METALS INCLUDING ARSENIC AND CADMIUM.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES CAPPING THE LDA WITH A SOIL/CLAY COVER AND INSTALLING A GAS VENTING SYSTEM TO REMOVE OFF-GASES; COVERING THE SDA AND NDA WITH A SOIL COVER, IF FURTHER WASTE CHARACTERIZATION DETERMINES THESE AREAS TO BE SOURCES OF ASBESTOS CONTAMINATION; MONITORING GROUND WATER ONSITE, OFFSITE, AND IN NEARBY PRIVATE WELLS TO DETERMINE THE EFFECTIVENESS OF THE LANDFILL CAP IN CONTROLLING THE MIGRATION OF CONTAMINANTS INTO GROUND WATER; MONITORING LANDFILL GASES; AND IMPLEMENTING INSTITUTIONAL CONTROLS INCLUDING DEED RESTRICTIONS, AND SITE ACCESS RESTRICTIONS SUCH AS FENCING. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $1,298,000, WHICH INCLUDES A TOTAL O&M COST OF $11,000 FOR 30 YEARS.

PERFORMANCE STANDARDS OR GOALS; THE STATE HAS DETERMINED THAT CONTAMINANT MIGRATION FROM THE LANDFILL TO GROUND WATER MUST NOT EXCEED STATE PREVENTION ACTION LIMITS (PALS), INCLUDING BENZENE 0.067 UG/L (PAL).
 
Remedy:  BASED ON THE FINDINGS OF THE RI/FFS AND THE DOCUMENTS WITHIN THE ADMINISTRATIVE RECORD FILE AND THE RESULTS OF THE PUBLIC COMMENT PERIOD, THE SELECTED REMEDY FOR THE AMLF IS AS FOLLOWS;

* A SOIL/CLAY COVER MEETING THE PERFORMANCE STANDARDS OF WAC NR 504.07 OVER THE LDA.
* THE NDA AND SDA WILL BE COVERED WITH A SOIL COVER UNLESS, UPON FURTHER CHARACTERIZATION OF WASTES DEPOSITED WITHIN THESE DISPOSAL AREAS, THEY SHOW NO POTENTIAL FOR CONTRIBUTING TO THE CONTAMINATION OF THE SITE.
* A GROUND WATER MONITORING PROGRAM WOULD CONTINUE TO MEASURE AND DETECT INCREASES OR DECREASES IN GROUND WATER CONTAMINATION.
* A LANDFILL GAS VENTING SYSTEM WOULD BE INSTALLED WITH A GAS MIGRATION TRENCH ALONG THE NORTHWEST SIDE OF THE LDA. GAS MONITORING PROBES AND WELLS WOULD BE CONSTRUCTED WITH PERIODIC MONITORING OF THE PROBES. THE LANDFILL GAS EXTRACTION SYSTEM WILL BE DESIGNED DURING THE REMEDIAL DESIGN STAGE, BUT MAY INVOLVE EXTRACTION WELLS CONNECTED BY A PIPE SYSTEM TO A MECHANICAL BLOWER.
* INSTITUTIONAL CONTROLS WOULD BE IMPLEMENTED TO SUPPLEMENT ENGINEERING CONTROLS. THE INSTITUTIONAL CONTROLS INCLUDE: ACCESS RESTRICTIONS TO ASSURE THAT FUTURE USE OF THIS SITE DOES NOT INCREASE THE RELEASE OR POTENTIAL RELEASE OF HAZARDOUS SUBSTANCES TO THE ENVIRONMENT OR BECOME DANGEROUS TO THE LIFE OR HEALTH OF PEOPLE; AND INSTALLATION A FENCE TO PROTECT THE PUBLIC FROM DIRECT CONTACT AND TO PREVENT DISTURBANCE OF THE COVER.
 
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