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Record of Decision System (RODS)

RAYMARK

Abstract

Site Name:  RAYMARK
Address:  220 JACKSONVILLE RD 
City & State:  HATBORO  PA  19040
County:  MONTGOMERY
 
EPA ID:  PAD039017694
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-90/100
ROD Date:  09/28/1990
Operable Unit(s):  02
 
Media:  GROUNDWATER
 
Contaminant:  VOCS, TCE, PCE
 
Abstract:  THE 7-ACRE RAYMARK SITE IS AN ACTIVE METAL MANUFACTURING AND ELECTROPLATING PLANT IN THE BOROUGH OF HATBORO, MONTGOMERY COUNTY, PENNSYLVANIA. THE SITE IS IN AN INDUSTRIAL AREA AND IS APPROXIMATELY 100 FEET FROM THE NEAREST RESIDENCE. THE NEAREST SURFACE WATER IS PENNYPACK CREEK, WHICH FLOWS 4,000 FEET SOUTHWEST OF THE SITE. AS PART OF THE RIVET MANUFACTURING PROCESS AT THE PLANT, VOCS, INCLUDING 30 TO 40 GALLONS OF TCE, WERE USED DAILY AT THE SITE TO CLEAN AND DEGREASE METAL PARTS. IN 1979, WHEN EPA DISCOVERED TCE IN THE HATBORO PUBLIC WATER SUPPLY WELLS, THE HATBORO BOROUGH WATER AUTHORITY REMOVED THESE WELLS FROM OPERATION, AND SUPPLEMENTED THE WATER SUPPLY USING AN INTERCONNECTION WITH A NEIGHBORING WATER COMPANY. FURTHER EPA SITE INVESTIGATIONS FROM 1980 TO 1987 IDENTIFIED TCE IN SOIL AND OTHER WELLS ONSITE AND ADJACENT TO THE PROPERTY AND SEEM TO INDICATE THAT CONTAMINANTS FROM THE SITE MAY HAVE BEEN AT LEAST A CONTRIBUTING SOURCE OF CONTAMINATION IN THE DOWNGRADIENT PUBLIC WATER SUPPLY WELLS. OTHER CHEMICAL CONTAMINANTS IDENTIFIED IN SAMPLES FROM THE PUBLIC WATER SUPPLY WELLS, INCLUDING TCA, DID NOT SEEM TO ORIGINATE AT THE SITE, THUS INDICATING SEVERAL DISTINCT SOURCES FOR THIS CONTAMINATION. IN 1987, THE SITE OWNERS AGREED TO INSTALL GROUND WATER TREATMENT UNITS WITH AIR STRIPPING TOWERS, AND, AS NECESSARY, AIR EMISSION CONTROL UNITS, AT TWO HATBORO PUBLIC SUPPLY WELLS TO RETURN THESE TO ROUTINE OPERATION. THIS RECORD OF DECISION (ROD) ADDRESSES THE PRINCIPLE THREATS POSED BY THE SITE, SPECIFICALLY THE CONTAMINATED DRINKING WATER AND GROUND WATER WHICH ARE REFERRED TO AS OPERABLE UNITS 2 AND 3 (OU2 & OU3), RESPECTIVELY. THE SOIL/SOURCE CONTAMINATION (OU1), WILL BE ADDRESSED IN A SUBSEQUENT ROD. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER ARE VOCS INCLUDING TCE AND PCE.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES CONTINUING THE OPERATION AND MAINTENANCE OF THE HATBORO PUBLIC SUPPLY AND THE EXISTING AIR STRIPPING TOWERS AT THE WELLS AND THE INSTALLATION OF NEW VAPOR PHASE CARBON ADSORPTION UNITS; COMPLETING A GROUND WATER REMEDIAL DESIGN STUDY TO DETERMINE THE NUMBER, LOCATION, AND CONSTRUCTION OF NEW EXTRACTION WELLS WITH CORRESPONDING INSTALLATION AND IMPLEMENTATION; ONSITE PUMPING AND TREATMENT OF GROUND WATER WITH AIR STRIPPING AND VAPOR PHASE CARBON ADSORPTION UNITS WITH OFFSITE DISPOSAL TO PENNYPACK CREEK; AND IMPLEMENTING INSTITUTIONAL CONTROLS. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $2,700,000, WHICH INCLUDES AN ANNUAL O&M COST OF $125,000.

PERFORMANCE STANDARDS OR GOALS: THE GROUND WATER WILL BE REMEDIATED UNTIL CONTAMINANT LEVELS REACH SDWA MCLS, NON-ZERO MCLGS, OR BACKGROUND LEVELS, WHICHEVER ARE MORE RESTRICTIVE. THE RESIDUAL EXCESS CANCER RISK RESULTING FROM SITE-RELATED CONTAMINATION WILL BE REDUCED TO A (10-6) LEVEL AND NON-CARCINOGENIC LEVELS WILL BE REDUCED TO A HAZARD INDEX = 1. CHEMICAL-SPECIFIC STANDARDS FOR GROUND WATER INCLUDE TCE 5 UG/L (MCL) AND PCE 5 UG/L (PROPOSED MCL). ADDITIONAL, STILL-UNDEFINED, AQUIFER CONTAMINATION AT THE SITE MAY MAKE IT TECHNICALLY IMPRACTICABLE TO ATTAIN THESE LEVELS, AND IF SO, AN ARAR WAIVER WILL BE ENACTED AND THE ROD AMENDED.
 
Remedy:  OPERABLE UNITS 2 AND 3 ARE THE SECOND AND THIRD OF THREE OPERABLE UNITS FOR THE SITE. OPERABLE UNITS 2 AND 3 ADDRESS CONTAMINATED DRINKING WATER AND GROUND WATER WHICH ARE THE PRINCIPAL THREATS POSED BY THE SITE. THE SELECTED REMEDY PROVIDES CLEAN DRINKING WATER FOR THE PUBLIC AND PROTECTION FROM FURTHER SITE-RELATED GROUND WATER CONTAMINATION. OPERABLE UNIT 1 WILL ADDRESS THE AREA OF SOIL CONTAMINATION AT THE SITE.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE;

* COMPLETION OF A GROUND WATER REMEDIAL DESIGN STUDY TO DETERMINE THE MOST EFFICIENT DESIGN OF A GROUND WATER EXTRACTION AND TREATMENT SYSTEM.
* CONTINUED OPERATION AND MAINTENANCE OF PUBLIC WATER SUPPLY WELLS BY THE HATBORO BOROUGH WATER AUTHORITY.
* CONTINUED OPERATION AND MAINTENANCE OF AIR STRIPPING TOWERS INSTALLED AT CONTAMINATED PUBLIC WATER SUPPLY WELLS BY THE HATBORO BOROUGH WATER AUTHORITY.
* INSTALLATION, OPERATION, AND MAINTENANCE OF VAPOR PHASE CARBON ADSORPTION UNITS AT PUBLIC WATER SUPPLY WELLS EQUIPPED WITH AIR STRIPPING TOWERS.
* INSTALLATION, OPERATION, AND MAINTENANCE OF ONSITE GROUND WATER EXTRACTION WELLS TO REMOVE CONTAMINATED GROUND WATER FROM BENEATH THE SITE AND TO PREVENT CONTAMINANTS FROM MIGRATING OFFSITE.
* INSTALLATION, OPERATION, AND MAINTENANCE OF AIR STRIPPING TREATMENT AT ONSITE GROUND WATER EXTRACTION WELLS TO TREAT GROUND WATER TO REQUIRED LEVELS.
* INSTALLATION, OPERATION, AND MAINTENANCE OF VAPOR PHASE CARBON ADSORPTION UNITS ON ONSITE AIR STRIPPING TOWERS.
* CONSTRUCTION, OPERATION, AND MAINTENANCE OF A PIPELINE FROM THE ONSITE GROUND WATER TREATMENT PLANT TO THE STORM SEWER SYSTEM TO DISCHARGE TREATED GROUND WATER INTO THE STORM SEWER SYSTEM AND THEN OFFSITE TO THE PENNYPACK CREEK.
* PERIODIC SAMPLING OF GROUND WATER AND TREATED WATER TO ENSURE TREATMENT COMPONENTS ARE EFFECTIVE AND GROUND WATER REMEDIATION IS PROGRESSING TOWARDS THE CLEANUP GOALS.
* INSTITUTIONAL CONTROLS TO ENSURE THAT THE HATBORO WATER AUTHORITY CONTINUES TO OPERATE PUBLIC WATER SUPPLY WELLS EQUIPPED WITH TREATMENT SYSTEMS.
 
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