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Record of Decision System (RODS)

SOUTHERN MARYLAND WOOD TREATING

Abstract

Site Name:  SOUTHERN MARYLAND WOOD TREATING
Address:  STATE ROUTE 235 
City & State:  HOLLYWOOD  MD  20636
County:  ST. MARY'S
 
EPA ID:  MDD980704852
EPA Region:  03
 
NPL Status:  Deleted from the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-88/051
ROD Date:  06/29/1988
Operable Unit(s):  01
 
Media:  DEBRIS GROUNDWATER SEDIMENTS SOILS SURFACEWATER
 
Contaminant:  PNHS, VOCS
 
Abstract:  THE SOUTHERN MARYLAND WOOD TREATING (SMWT) SITE IS LOCATED IN HOLLYWOOD, ST. MARY'S COUNTY, MARYLAND. THE SITE IS SITUATED WITHIN A WETLAND AREA IN A DRAINAGE DIVIDE SUCH THAT RUNOFF FROM THE SITE DISCHARGES INTO BROOKS RUN AND MCINTOSH RUN TRIBUTARIES, WHICH FLOW INTO THE POTOMAC RIVER. THE AREA SURROUNDING THE SITE IS PREDOMINANTLY USED FOR AGRICULTURAL AND RESIDENTIAL PURPOSES. FROM 1965 TO 1975, SMWT OPERATED AS A PRESSURE TREATMENT FACILITY FOR WOOD PRESERVATION. CURRENTLY, PART OF THE SITE IS BEING USED AS A RETAIL OUTLET FOR PRETREATED LUMBER AND CRAB TRAPS. THE WASTE GENERATED AT THE SITE INCLUDED RETORT AND CYLINDER SLUDGES, PROCESS WASTES, AND MATERIAL SPILLAGE. THESE WASTES WERE IN SIX ONSITE UNLINED LAGOONS. AN ONSITE FRESHWATER POND BECAME CONTAMINATED DURING THE FACILITIES ACTIVE AND INACTIVE PERIODS WITH VOCS, POLYNUCLEAR AROMATICS (PNAS), AND BASE/NEUTRAL EXTRACTABLES DUE TO CONTAMINATED GROUND WATER AND SURFACE RUNOFF. CLEANUP ACTIONS WERE INITIATED IN 1982 FOLLOWING LEGAL ACTIONS BY THE MARYLAND DEPARTMENT OF HEALTH AND MENTAL HYGIENE. LIQUIDS REMOVED FROM THE SIX LAGOONS WERE SPRAY IRRIGATED ONTO THE NEARBY WOODS. THE SIX LAGOONS WERE EXCAVATED, BACKFILLED, AND GRADED, AND THE FRESHWATER POND WAS PARTIALLY EXCAVATED. THE EXCAVATED SLUDGES WERE MIXED WITH COMPOSITED SLUDGE AND TOPSOIL, AND SPREAD IN A LEVEL TREATMENT AREA LOCATED ON THE PROPERTY. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE ONSITE GROUND WATER, (SEE ATTACHED SHEET) SOIL, SURFACE WATER, SEDIMENTS, AND DEBRIS INCLUDE; VOCS, PNA, AND BASE/NEUTRAL ACID EXTRACTABLES.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES: EXCAVATION/DREDGING OF SOILS, SEDIMENTS, TANK LIQUIDS, AND CEMENT, AND TREATMENT USING ONSITE INCINERATION WITH ONSITE DISPOSAL OF NON-HAZARDOUS RESIDUAL ASH, BACKFILLING, REGRADING, AND REVEGETATING, WHERE NECESSARY; INSTALLATION OF A SLURRY WALL; DEWATERING OF THE SLURRY WALL AREA BY A GROUND WATER AND SURFACE WATER PUMPING SYSTEM, AND TREATMENT USING ACTIVATED CARBON ADSORPTION OR HYDROGEN PEROXIDE AND IRRADIATION WITH DISCHARGE TO THE ONSITE POND; INSTALLATION OF A GEOTEXTILE SILT FENCE, SEDIMENTATION BASINS, AND/OR DIVERSION; AND GROUND WATER, SURFACE WATER, ENVIRONMENTAL, ORGANIC VAPOR, AND DUST MONITORING.
 
Remedy:  THE SELECTED REMEDY CONSISTS OF A FINAL OPERABLE UNIT OF ON-SITE THERMAL TREATMENT OF EXCAVATED SOILS, SEDIMENTS, AND OTHER MATERIALS AT THE SITE THAT EXHIBIT CONCENTRATIONS OF CONTAMINANTS ABOVE THE RISK -BASED LEVELS ESTABLISHED IN THE PUBLIC HEALTH EVALUATION. SOILS REMAINING IN THE GROUND WOULD BE COVERED WITH CLEAN FILL AND POSSIBLY BACKFILLED WITH NON-HAZARDOUS ASH FROM THE INCINERATOR PROCESS. AS NEEDED, GROUNDWATER AND SURFACE WATER WOULD BE TREATED AND DISCHARGED ON-SITE.

THE FUNCTION OF THE SELECTED REMEDY IS TO ELIMINATE CONTAMINANTS AT THE SMWT SITE AS A SOURCE OF GROUNDWATER AND SURFACE WATER CONTAMINATION AND TO REDUCE OR ELIMINATE THE RISKS ASSOCIATED WITH EXPOSURE TO CONTAMINATED SURFACE WATER, SOILS, AND SEDIMENTS.
 
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