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Record of Decision System (RODS)

MOSS-AMERICAN CO., INC. (KERR-MCGEE OIL CO.)

Abstract

Site Name:  MOSS-AMERICAN CO., INC. (KERR-MCGEE OIL CO.)
Address:  8716 N GRANVILLE ROAD 
City & State:  MILWAUKEE  WI  53244
County:  MILWAUKEE
 
EPA ID:  WID039052626
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-90/142
ROD Date:  09/27/1990
Operable Unit(s):  01
 
Media:  SOIL SEDIMENT GROUND WATER
 
Contaminant:  VOCS, BENZENE, TOLUENE, XYLENES, OTHER ORGANICS, PAHS
 
Abstract:  THE 88-ACRE MOSS-AMERICAN KERR-MCGEE OIL SITE, A FORMER WOOD PRESERVING FACILITY, IS IN MILWAUKEE, MILWAUKEE COUNTY, WISCONSIN. THE LITTLE MENOMONEE RIVER, WHICH FLOWS THROUGH THE FACILITY, LIES WITHIN THE 100-YEAR FLOODPLAIN AND IS INCLUDED AS PART OF THE SITE. A SECTION OF THE SITE IS WOODED, AND WETLANDS ARE LOCATED NEAR THE RIVER ONSITE AND DOWNSTREAM. A 23-ACRE PORTION OF THE SITE IS PRESENTLY USED AS A RAILROAD LOADING AND STORAGE FACILITY FOR AUTOMOBILES, AND THE REMAINDER OF THE SITE IS AN UNDEVELOPED PARKLAND. AN UNCONFINED SHALLOW AQUIFER UNDERLIES THE SITE. BEGINNING IN 1921, OPERATIONS CONSISTED OF WOOD PRESERVING OF RAILROAD TIES, POLES, AND FENCE POSTS WITH A MIXTURE OF CREOSOTE, WHICH IS HIGH IN PAHS, AND NO. 6 FUEL OIL. THE FACILITY CHANGED NAMES AND OWNERSHIP SEVERAL TIMES UNTIL IT CEASED OPERATIONS IN 1976. WASTES WERE DISCHARGED TO ONSITE SETTLING PONDS UNTIL 1971, WHEN WASTEWATER WAS DISCHARGED INTO THE SANITARY SEWER SYSTEM. IN 1971, SEVERAL PEOPLE RECEIVED CHEMICAL BURNS ATTRIBUTED TO CREOSOTE WHILE WADING THREE MILES DOWNSTREAM OF THE SITE. THIS LED TO A STATE ORDER REQUIRING CLEANUP OF ONSITE SETTLING PONDS BY THE SITE OWNER AND OPERATOR. IN 1973, EPA DREDGED 5,000 FEET OF THE RIVER DIRECTLY DOWNSTREAM OF THE SITE. DURING 1977 TO 1978, 450 CUBIC YARDS OF CONTAMINATED SOIL WERE REMOVED DURING THE DISMANTLING OF THE FACILITY. STUDIES CONDUCTED BEFORE 1980 INDICATED THAT EXTENSIVE CREOSOTE CONTAMINATION WAS PRESENT IN THE SOIL AND GROUND WATER ONSITE AS WELL AS IN THE SEDIMENT OF THE LITTLE MENOMONEE RIVER. THIS RECORD OF DECISION (ROD) PROVIDES A FINAL REMEDY AND ADDRESSES SOURCE AND GROUND WATER REMEDIATION. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL, SEDIMENT, AND GROUND WATER ARE VOCS INCLUDING BENZENE, TOLUENE, AND XYLENES; AND OTHER ORGANICS INCLUDING PAHS.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES REROUTING 5 MILES OF THE RIVER CHANNEL ONSITE PARALLEL TO THE EXISTING CHANNEL, FOLLOWED BY EXCAVATING HIGHLY CONTAMINATED SEDIMENTS FROM THE OLD CHANNEL; MITIGATING WETLAND AREAS; TREATING 5,200 CUBIC YARDS OF RIVER SEDIMENT, AND 80,000 CUBIC YARDS OF CONTAMINATED ONSITE SOIL USING ONSITE SOIL WASHING AND BIOSLURRY TECHNOLOGIES; SEPARATION AND DEWATERING OF RESIDUES FOLLOWED BY REDEPOSITION ONSITE; COVERING TREATED MATERIAL WITH 2 FEET OF CLEAN SOIL, 6 INCHES OF TOPSOIL, FOLLOWED BY REVEGETATION; RECYCLING OR TREATNG SLURRY WATER ONSITE BEFORE DISCHARGE TO A PUBLICLY OWNED TREATMENT WORKS (POTW) OR THE RIVER; CONSTRUCTING A SYNTHETIC GEOMEMBRANE BARRIER TO PREVENT MOVEMENT OF CONTAMINATED GROUND WATER INTO THE RIVER; COLLECTING GROUND WATER USING A DRAIN AND INTERCEPTOR SYSTEM, FOLLOWED BY TREATMENT USING AN OIL/WATER SEPARATOR AND GRANULAR ACTIVATED CARBON, WITH DISCHARGE OF TREATED WATER TO A POTW OR TO THE RIVER; REMOVING PURE-PHASE LIQUID WASTES FOR OFFSITE INCINERATION; AND GROUND WATER MONITORING. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $26,000,000, WHICH INCLUDES AN ANNUAL O&M COST OF $130,000 FOR 10 YEARS.

PERFORMANCE STANDARDS OR GOALS: GOALS ARE DESIGNED TO REDUCE THE EXCESS LIFETIME CANCER RISK FOR CARCINOGENS TO 10-4 OR LESS. FOR NON-CARCINOGENS, CLEANUP LEVELS WILL REDUCE THE HAZARD INDEX (HI) TO 1 OR LESS. CHEMICAL-SPECIFIC GOALS FOR GROUND WATER INCLUDE BENZENE 0.067 UG/L {STATE PREVENTIVE ACTION LEVEL (PAL)}, TOLUENE 68.6 UG/L (STATE PAL), AND XYLENES 124.0 UG/L (STATE PAL). THE CHEMICAL-SPECIFIC GOAL FOR SOIL AND SEDIMENT IS PAHS (CARCINOGENIC) 6.1 MG/KG (STATE).
 
Remedy:  THE SELECTED REMEDY WILL BE THE FINAL REMEDY AT THE SITE AND ADDRESSES THREE CONTAMINATED MEDIA, ON-SITE SOIL, ON-SITE GROUNDWATER, AND SEDIMENT OF THE LITTLE MENOMONEE RIVER. THE SELECTED REMEDY USES TREATMENT TO ADDRESS THE PRINCIPAL THREATS TO HUMAN HEALTH AND THE ENVIRONMENT POSED BY CONDITIONS AT THE SITE. THE REMEDY COMBINES SOURCE REMOVAL AND TREATMENT WITH CONTAINMENT AND SHORT-TERM SITE ACCESS RESTRICTIONS, THUS REDUCING THE THREATS SIGNIFICANTLY.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE THE FOLLOWING:

* REMOVAL AND TREATMENT OF 5,200 CUBIC YARDS OF CONTAMINATED SEDIMENT AND 80,000 CUBIC YARDS OF SOIL BY ON-SITE BIOREMEDIATION, COVERING REMAINING SOIL AND TREATMENT RESIDUE FOR A TOTAL OF 210,000 CUBIC YARDS, ON-SITE.
* REROUTING RIVER PARALLEL TO EXISTING CHANNEL, FILLING IN AND COVERING EXISTING CHANNEL.
* COLLECTING AND TREATING CONTAMINATED GROUNDWATER.
* ON-SITE DISPOSAL OF RESIDUE FROM TREATMENT OF NORTHEAST LANDFILL SOIL IN RCRA COMPLIANT UNIT WITHIN THE AREA OF CONTAMINATION.

SPECIFICALLY, THE RIVER WILL BE RECHANNELED; HIGHLY CONTAMINATED ON-SITE SOIL AND SEDIMENT FROM THE OLD RIVER CHANNEL WILL BE EXCAVATED AND TREATED BY SOIL-WASHING AND SLURRY BIO-REACTOR TO HEALTH BASED RISK LEVELS OF 1 X (10-4) OR LESS. THE TREATMENT RESIDUE AND LOW LEVEL REMAINING CONTAMINATION WILL BE COVERED ON-SITE; THE OLD RIVER CHANNEL WILL BE COVERED WITH SOIL FROM THE NEW CHANNEL. EXTRACTED GROUNDWATER WILL BE TREATED BY OIL/WATER SEPARATOR AND ACTIVATED CARBON.
 
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