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Record of Decision System (RODS)

CHEM CENTRAL

Abstract

Site Name:  CHEM CENTRAL
Address:  2940 STAFFORD AVE SW 
City & State:  WYOMING TOWNSHIP  MI  49548
County:  KENT
 
EPA ID:  MID980477079
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-91/179
ROD Date:  09/30/1991
Operable Unit(s):  01
 
Media:  SOIL GROUND WATER
 
Contaminant:  VOCS, PCE, TCE, TOLUENE, OTHER ORGANICS, PAHS, PCBS
 
Abstract:  THE 2-ACRE CHEM-CENTRAL SITE IS A BULK CHEMICAL STORAGE FACILITY IN WYOMING, KENT COUNTY, MICHIGAN. LAND USE IN THE AREA IS A MIXTURE OF RESIDENTIAL AND COMMERCIAL. AN ESTIMATED 10,000 PEOPLE LIVE WITHIN 1 MILE OF THE SITE AND RECEIVE THEIR WATER SUPPLY VIA THE MUNICIPAL DISTRIBUTION SYSTEM. TWO CREEKS, COLE DRAIN AND PLASTER CREEK, LIE IN PROXIMITY TO THE SITE. COLE DRAIN, WHICH HAS BEEN INCLUDED AS PART OF THE SITE, EMPTIES INTO PLASTER CREEK 2,500 FEET NORTH OF THE SITE. IN ADDITION, TWO HOTELS ARE LOCATED 800 FEET FROM THE SITE. SINCE 1957, CHEM-CENTRAL HAS USED THE SITE TO RECEIVE AND HOLD BULK CHEMICALS BY TRUCK AND RAILROAD TANKER BEFORE REDISTRIBUTION TO VARIOUS INDUSTRIES. FACILITIES AT THE SITE INCLUDE A BUILDING WITH TWO LOADING DOCKS AND A RAIL SPUR ON THE WEST SIDE OF THE PLANT. APPROXIMATELY 10 ABOVE-GROUND STORAGE TANKS ARE LOCATED ALONG THE PLANTS NORTH SIDE AND ARE SURROUNDED BY A CONCRETE CONTAINMENT WALL AND PAVED GROUND SURFACE. BETWEEN 1957 AND 1962, HAZARDOUS SUBSTANCES ENTERED THE GROUND AS A RESULT OF FAULTY CONSTRUCTION OF A T-ARM PIPE USED TO TRANSFER LIQUID PRODUCTS FROM BULK STORAGE TANKS TO SMALL DELIVERY TRUCKS. ADDITIONAL HAZARDOUS SUBSTANCES MAY HAVE ENTERED THE GROUND THROUGH ACCIDENTAL SPILLS. IN 1977, A ROUTINE STATE BIOLOGICAL SURVEY OF PLASTER CREEK IDENTIFIED A CONTAMINATED DITCH CONTAINING OILS WITH ORGANIC COMPOUNDS INCLUDING PCBS AND METALS THAT WAS DISCHARGING INTO COLE DRAIN. IN 1977, THE STATE ATTEMPTED TO STOP THE OIL FLOW BY DAMMING THE DITCH. IN 1978, EPA EXCAVATED SLUDGE FROM THE DITCH AND REMOVED THE SLUDGE USING TWELVE 55-GALLON DRUMS FOR OFFSITE DISPOSAL. OILS, GROUND WATER, AND VARIOUS CONTAMINANTS CONTINUED TO ENTER THE DITCH, AND THE STATE UNSUCCESSFULLY ATTEMPTED TO FILTER OIL OUT OF THE WATER. BETWEEN 1978 AND 1986, THE STATE AND EPA FOCUSED THEIR EFFORTS ON FINDING AND ELIMINATING THE SOURCE OF THE DITCH CONTAMINATION THROUGH EXTENSIVE INVESTIGATIONS OF AREA SOIL, GROUND WATER, AND SURFACE WATER. RESULTS INDICATED THAT GROUND WATER AND SOIL SURROUNDING AND NORTH OF THE CHEM-CENTRAL PLANT WERE CONTAMINATED WITH VOLATILE AND SEMI-VOLATILE ORGANIC COMPOUNDS. IN 1980, THE STATE REQUIRED CHEM-CENTRAL TO CLEAN UP THE CONTAMINATION AND TO INSTITUTE A GROUND WATER MONITORING PROGRAM. CONSEQUENTLY, BETWEEN 1984 AND 1985, THREE GROUND WATER EXTRACTION WELLS, AN INTERCEPTOR TRENCH, AND A TREATMENT SYSTEM USING AN AIR STRIPPER WERE INSTALLED. CONTAMINATED WATER, SOIL, AND SLUDGE WERE REMOVED FROM THE DITCH AND PLACED IN HAZARDOUS WASTE LANDFILLS, AND THE DITCH WAS BACKFILLED WITH CLEAN SOIL. THIS RECORD OF DECISION (ROD) ADDRESSES A REMEDY FOR CONTAMINATED ONSITE SOIL, CONTAMINATED OFFSITE SOIL SURROUNDING AND NORTH OF THE PLANT, AND THE ADDRESSES A REMEDY FOR CONTAMINATED ONSITE SOIL, CONTAMINATED OFFSITE SOIL SURROUNDING AND NORTH OF THE PLANT, AND THE GROUND WATER CONTAMINATION PLUME EMANATING FROM THE PLANT AND SPREADING 1,800 FEET NORTHWARD. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL AND GROUND WATER ARE VOCS INCLUDING PCE, TCE, AND TOLUENE; AND OTHER ORGANICS INCLUDING PAHS AND PCBS.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES INSTALLING AN IN-SITU VAPOR EXTRACTION SYSTEM FOR ONSITE SOIL AND TWO OFFSITE SOIL AREAS NORTH OF THE PROPERTY, USING A NETWORK OF HORIZONTAL PIPING, COLLECTING CONTAMINATED VAPORS IN THE SOIL SOURCE AREA AT THE VACUUM PUMP, AND TREATING THESE VAPORS USING A VAPOR PHASE CARBON ADSORPTION SYSTEM BEFORE DISCHARGE TO THE ATMOSPHERE; CONTINUING THE OPERATION AND MAINTENANCE OF THE CURRENT GROUND WATER COLLECTION AND TREATMENT SYSTEM; INSTALLING, OPERATING, AND MAINTAINING AN EXPANSION OF THE CURRENT OFFSITE GROUND WATER COLLECTION SYSTEM EITHER BY EXTENDING THE CURRENT INTERCEPTOR TRENCH FURTHER EAST OR NORTH, OR BY CONSTRUCTING TWO ADDITIONAL PURGE WELLS EAST OF THE CURRENT INTERCEPTOR TRENCH; INSTALLING AND OPERATING A PURGE WELL IN THE DEEP LENS OF CONTAMINATED GROUND WATER BENEATH THE MAIN AQUIFER, AND CONNECTING THIS WELL TO THE PUMP AND TREAT SYSTEM; TREATING CONTAMINATED GROUND WATER USING AN AIR STRIPPER WITH OFFSITE DISCHARGE TO A PUBLICLY OWNED TREATMENT WORKS (POTW); COLLECTING OIL IN THE PURGE WELLS, AND DISPOSING OF THE OIL AT AN OFFSITE FACILITY; MONITORING GROUND WATER; AND IMPLEMENTING INSTITUTIONAL CONTROLS INCLUDING DEED RESTRICTIONS. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $2,099,000, WHICH INCLUDES AN ANNUAL O&M COST OF $170,000; OR $2,131,000, WHICH INCLUDES AN ANNUAL O&M COST OF $172,900, DEPENDING ON WHICH OFFSITE GROUND WATER COLLECTION OPTION IS USED.

PERFORMANCE STANDARDS OR GOALS; CONTAMINANT GOALS FOR SOIL ARE BASED ON (10-6) CANCER LEVEL OR THE HUMAN LIFE CYCLE SAFE CONCENTRATION (HLSC). CLEAN-UP LEVELS IN SOIL MUST BE REDUCED TO LESS THAN 20 TIMES THE GROUND WATER STANDARD FOR EACH CHEMICAL, OR SOIL LEACH TESTS (TCLP) MUST PRODUCE LEACHATE WITH CONTAMINANT LEVELS BELOW THE GROUND WATER CLEAN-UP LEVELS. CHEMICAL-SPECIFIC GROUND WATER CLEAN-UP GOALS ARE BASED ON HEALTH-BASED CRITERIA INCLUDING (10-6) RISK LEVEL OR HUMAN LIFE-CYCLE SAFE (CONCENTRATION) AND STATE LEVELS INCLUDING TCE 3 UG/L (HEALTH-BASED), PCE 0.7 UG/L (HEALTH-BASED), AND TOLUENE 100 UG/L.
 
Remedy:  THE SELECTED REMEDY IS FOR GROUND WATER AND ON-PROPERTY AND OFF-PROPERTY SOILS, WITH THE EXCEPTIONS NOTED BELOW. THE SELECTED REMEDY USES TREATMENT TO ADDRESS THE PRINCIPAL THREATS AT THE SITE. SOILS BENEATH THE CHEM CENTRAL BUILDING AND PAVED AREAS ON THE CHEM CENTRAL PROPERTY ARE NOT PART OF THIS REMEDY.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE;
* CONTINUE OPERATION OF THE CURRENT EXISTING GROUND WATER COLLECTION AND TREATMENT SYSTEM.
* INSTALL AND OPERATE AN EXPANSION OF THE CURRENT OFF-PROPERTY GROUND WATER COLLECTION SYSTEM, BY EITHER EXTENDING THE INTERCEPTOR TRENCH OR INSTALLING ADDITIONAL PURGE WELLS.
* INSTALL AND OPERATE A PURGE WELL AT THE DEEP LENS OF CONTAMINATED GROUND WATER LOCATION AND HOOK THIS WELL INTO THE CURRENT GROUND WATER COLLECTION AND TREATMENT SYSTEM.
* COLLECT OIL ACCUMULATING IN THE PURGE WELLS AND DISPOSE OF THE OIL AT AN OFF-SITE FACILITY IN ACCORDANCE WITH APPLICABLE FEDERAL AND STATE REGULATIONS.
* INSTALL AND OPERATE A SOIL VAPOR EXTRACTION SYSTEM FOR SOILS ON-PROPERTY AS WELL AS TWO OFF-PROPERTY LOCATIONS JUST NORTH OF THE PROPERTY.
* IMPOSE INSTITUTIONAL CONTROLS, SUCH AS DEED RESTRICTIONS TO PROHIBIT THE INSTALLATION OF WATER WELLS IN THE SITE AREA AND ANY FUTURE DEVELOPMENT THAT MIGHT DISTURB CONTAMINATED SOILS.
* IMPLEMENT A GROUND WATER MONITORING PROGRAM CAPABLE OF DEMONSTRATING THE EFFECTIVENESS OF THE GROUND WATER CAPTURE SYSTEM AND THAT GROUND WATER TREATMENT TECHNOLOGY IS ACHIEVING CLEAN-UP STANDARDS.
 
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