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Record of Decision System (RODS)

MID-ATLANTIC WOOD PRESERVERS, INC.

Abstract

Site Name:  MID-ATLANTIC WOOD PRESERVERS, INC.
Address:  P O BOX 58 SHIPLEY AVE 
City & State:  HARMANS  MD  21077
County:  ANNE ARUNDEL
 
EPA ID:  MDD064882889
EPA Region:  03
 
NPL Status:  Deleted from the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-91/106
ROD Date:  12/31/1990
Operable Unit(s):  01
 
Media:  SOIL GROUNDWATER
 
Contaminant:  METALS, ARSENIC, CHROMIUM
 
Abstract:  THE 3-ACRE MID-ATLANTIC WOOD PRESERVERS (MAWP) SITE IS A WOOD TREATMENT FACILITY IN HARMANS, ANNE ARUNDEL COUNTY, MARYLAND. LAND USE IN THE AREA IS PREDOMINANTLY INDUSTRIAL AND RESIDENTIAL, AND A WETLAND AREA TRAVERSED BY STONY RUN CREEK LIES 600 FEET WEST OF THE SITE. SINCE 1974, THE FACILITY HAS BEEN USED FOR PRESSURE TREATMENT OF LUMBER USING CHROMATE COPPER ARSENATE (CCA) AS THE WOOD PRESERVATIVE. THE SITE IS DIVIDED INTO TWO AREAS; A TREATMENT YARD ON THE EASTERN HALF OF THE SITE, AND STORAGE YARD ON THE WESTERN HALF. THE TREATMENT YARD CONTAINS CCA STORAGE TANKS, A PRESSURE CYLINDER, AND A DRIP PAD AREA. IN 1978, THE COUNTY DETERMINED THAT WATER IN A SHALLOW RESIDENTIAL WELL DOWNGRADIENT OF THE SITE WAS CONTAMINATED WITH HIGH LEVELS OF HEXAVALENT CHROMIUM. SUBSEQUENT INVESTIGATIONS BY THE STATE IN 1978 REVEALED THAT SOIL AND GROUND WATER CONTAMINATION BY CHROMIUM AND ARSENIC WAS THE RESULT OF AN OVERFLOW PIPE FROM A CCA STORAGE TANK. UNDER AN AGREEMENT WITH THE STATE, MAWP REMOVED 26 CUBIC YARDS OF CONTAMINATED SOIL BENEATH THE OVERFLOW PIPE, MODIFIED THE CCA STORAGE SYSTEM, AND INSTALLED A CONCRETE DRAINAGE PAD TO COLLECT DRIPPINGS AND REDUCE FUTURE CONTAMINATION. HOWEVER, OFFSITE INVESTIGATIONS BY EPA IN 1983 IDENTIFIED ELEVATED LEVELS OF ARSENIC AND CHROMIUM IN GROUND WATER. FURTHER EPA AND MAWP STUDIES DOCUMENTED ONSITE ARSENIC-CONTAMINATED SOIL, THE RESULT OF REMOVING TREATED WOOD PREMATURELY FROM THE DRIP AREA BEFORE IT HAD DRIED, MAS THE PRINCIPAL THREAT. IN ADDITION, THESE STUDIES IDENTIFIED APPROXIMATELY 5,200 CUBIC YARDS OF DEGRADED SOIL, TO AN AVERAGE DEPTH OF TWO FEET, IN THE TREATMENT YARD DRIP PAD AREA AND IN THE WESTERN MOST THIRD OF THE STORAGE YARD. RESIDENTIAL GROUND WATER METAL CONTAMINATION LEVELS WERE FOUND TO BE AT MUCH LOWER LEVELS THAN DETECTED IN EARLIER INVESTIGATIONS; ARSENIC WAS NOT DETECTED, AND CHROMIUM WAS DETECTED ABOVE THE MCL IN ONLY ONE WELL. THIS RECORD OF DECISION (ROD) ADDRESSES CONTAMINATED ONSITE SOIL AND GROUND WATER. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL AND GROUND WATER ARE METALS INCLUDING ARSENIC AND CHROMIUM.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES EXCAVATING AND STABILIZING APPROXIMATELY 20 CUBIC YARDS OF ONSITE SOIL CONTAMINATED WITH ARSENIC LEVELS GREATER THAN 1,000 MG/KG (REFERRED TO AS HOT SPOTS), FOLLOWED BY OFFSITE DISPOSAL; CAPPING THE REMAINING SOIL WITH ARSENIC CONCENTRATIONS BETWEEN 10 MG/KG AND 1,000 MG/KG WITH AN ASPHALT/CONCRETE CAP; CONSTRUCTING AN ENLARGED AND ROOFED DRIP PAD WHICH IS CONSISTENT WITH NEW WOOD TREATING REGULATIONS; ALLOWING NATURAL ATTENUATION TO LOWER CHROMIUM LEVELS IN GROUND WATER; MONITORING SEDIMENT, GROUND WATER, SURFACE WATER, AND AIR; AND IMPLEMENTING INSTITUTIONAL CONTROLS INCLUDING DEED RESTRICTIONS. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $322,400, WHICH INCLUDES AN ANNUAL O&M COST OF $6,500 FOR 30 YEARS.

PERFORMANCE STANDARDS OR GOALS; CHEMICAL-SPECIFIC GOALS FOR SOIL ARE BASED ON ACHIEVING A (10-5) CANCER RISK LEVEL. THE CHEMICAL-SPECIFIC GOALS FOR GROUND WATER ARE BASED ON FEDERAL MCLS INCLUDING CHROMIUM 50 UG/L. EPA FEELS THAT MCLS WILL BE ACHIEVED BY NATURAL ATTENUATION WITHIN 3 MONTHS AFTER CONSTRUCTION IS COMPLETED.
 
Remedy:  THE REMEDIAL ACTION SELECTED IN THIS DOCUMENT IS PRESENTED AS THE PERMANENT REMEDY FOR REDUCING RISKS ASSOCIATED WITH HUMAN CONTACT WITH CONTAMINATED SOILS AT THE SITE. THIS REMEDY IS COMPRISED OF THE FOLLOWING MAJOR COMPONENTS;
* EXCAVATION, STABILIZATION AND OFFSITE DISPOSAL OF "HOT SPOTS" OF HIGHLY CONTAMINATED SOILS (GREATER THAN 1,000 MG/KG ARSENIC) WHICH HAVE BEEN DETERMINED TO BE A PRINCIPAL THREAT;
* CAPPING OF SOILS CONTAINING ARSENIC AT CONCENTRATIONS GREATER THAN 10 MG/KG BUT LESS THAN 1,000 MG/KG WITH AN ASPHALT/CONCRETE CAP;
* CONSTRUCTION OF AN ENLARGED ROOFED DRIP PAD CONSISTENT WITH NEW WOOD TREATING REGULATIONS;
* ENVIRONMENTAL MONITORING TO ENSURE THE EFFECTIVENESS OF THE REMEDIAL ACTION; AND
* IMPLEMENTATION OF A DEED RESTRICTION.
 
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