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Record of Decision System (RODS)

DELAWARE CITY PVC PLANT

Abstract

Site Name:  DELAWARE CITY PVC PLANT
Address:  RTE 13 & SCHOOL HOUSE RD 
City & State:  DELAWARE CITY  DE  19706
County:  NEW CASTLE
 
EPA ID:  DED980551667
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-86/031
ROD Date:  09/30/1986
Operable Unit(s):  01
 
Media:  GROUNDWATER SOIL SURFACE WATER
 
Contaminant:  EDC, PVC, TCE, VCM
 
Abstract:  THE DELAWARE CITY PVC SITE IS LOCATED TWO MILES NORTHWEST OF DELAWARE CITY, NEW CASTLE COUNTY, DELAWARE. IN 1966 STAUFFER CHEMICAL COMPANY (SCC) OF WESTPORT, CONNECTICUT, FOUNDED THE DELAWARE CITY PVC PLANT, WHICH IS USED FOR THE MANUFACTURING OF POLYVINYLCHLORIDE RESIN (PVC), POLYVINYL ACETATE AND OTHER POLYMERS. FROM 1971 TO 1974 OFF-GRADE PVC RESIN, SLUDGE FROM THE WASTEWATER TREATMENT SYSTEM AND RESIDUE FROM THE STRIPPING PROCESS WERE DISPOSED OF IN TWO ONSITE PITS. THESE "BURIED SLUDGE PITS" WERE CLOSED AND COVERED IN 1979. OFF-GRADE PVC RESIN WAS DISPOSED OF IN A THIRD PIT. THIS MATERIAL WAS REMOVED AND THE PITS BACKFILLED IN 1974. IN MAY 1981 FORMOSA ACQUIRED THE PVC MANUFACTURING AND PROCESSING FACILITY AND HAS CONTINUED OPERATIONS TO PRESENT. THE TWO BURIED SLUDGE PITS AND THE THIRD DISPOSAL PIT WERE RETAINED BY SCC AS PART OF ITS CARBON DISULFIDE PLANT, LOCATED ADJACENT TO THE PVC PLANT PROPERTY. AN EPA CONDUCTED INSPECTION IN MAY 1982 INDICATED SERIOUS CONTAMINATION OF THE SHALLOW GROUND WATER. CURRENTLY, GROUND WATER, SURFACE WATER, AND SOILS ARE CONTAMINATED WITH PVC, BENZYL CHLORIDE MONOMER (VCM), TCE, AND 1,2-DICHLOROETHANE (EDC).

THE DESCRIPTION OF THE SELECTED REMEDIAL ACTION FOR EACH AREA OF THIS SITE IS PROVIDED BELOW. OFF-GRADE BATCH PITS; EXCAVATE AND REMOVE EXISTING PVC SLUDGE AND CONTAMINATED SOILS; INSTALL A DOUBLE SYNTHETIC LINER; INSTALL MONITORING WELLS AND PERFORM QUARTERLY SAMPLE ANALYSIS FOR TCE, EDC, VCM. THE EXCAVATED MATERIAL WILL BE PROCESSED AND RECOVERED (ESTIMATED AT 80-85%) AS A SALEABLE FINISHED PRODUCT TO THE MAXIMUM EXTENT POSSIBLE. NON-RECOVERABLE MATERIAL WILL BE DISPOSED OF OFFSITE AT AN APPROVED RCRA FACILITY. STORMWATER RESERVOIR; THE SAME REMEDY AS DESCRIBED FOR THE ABOVE OFF-GRADE BATCH PITS. UNLINED DITCHES; EXCAVATE AND REMOVE PVC SLUDGE AND DISPOSE OF AT AN APPROVED RCRA FACILITY; INSTALL A SINGLE SYNTHETIC LINER. AERATED LAGOONS; EXCAVATE AND REMOVE PVC SLUDGE; CLEAN AND REPAIR LAGOONS AS NECESSARY; INSTALL A DOUBLE SYNTHETIC LINER; INSTALL MONITORING WELLS AND PERFORM QUARTERLY SAMPLING ANALYSIS FOR TCE, EDC AND VCM. THE EXCAVATED MATERIAL WILL BE RECOVERED TO THE MAXIMUM EXTENT POSSIBLE (ESTIMATED TO BE 80-85%) AND NON-RECOVERABLE MATERIAL WILL BE DISPOSED OF OFFSITE AT AN APPROVED RCRA FACILITY. CLOSED BURIED SLUDGE PITS; PLACE A DRAINAGE LAYER ON TOP OF THE EXISTING SYNTHETIC CAP; COVER WITH A SECOND SYNTHETIC CAP AND TOPSOIL AND REVEGETATE. FORMER PVC STORAGE AREA; COVER AND CAP THE ENTIRE AREA WITH A DOUBLE SYNTHETIC CAP. GROUND WATER; INSTALL A LINE OF SIX GROUND WATER RECOVERY WELLS AT THE NORTHERN EDGE OF THE CONTAMINANT PLUME, AND ANOTHER SIX WELLS AT THE SOUTHERN EDGE. REUSE THE COLLECTED GROUND WATER IN FORMOSA'S PLANT OPERATIONS. DURING PERIODS OF LOW WATER DEMAND IN THE PLANT, TREAT THE GROUND WATER IN THE EXISTING WASTE WATER TREATMENT PLANT. INSTALL TWO MONITORING WELLS AT THE SOUTHERN EDGE OF THE PLUME. PROVIDE AN ALTERNATE WATER SUPPLY FOR EXISTING CONTAMINATED WELLS. OPERATION AND MAINTENANCE; AS A MINIMUM, REGULAR INSPECTIONS AND, AS NECESSARY, REPAIRS TO THE LINERS AND CAPS. THE GROUND WATER RECOVERY SYSTEM WILL BE ROUTINELY MONITORED TO ASSURE THAT IT IS CAPTURING THE CONTAMINATED PLUME. THE ESTIMATED CAPITAL COST FOR THE REMEDY IS $1,904,000 WITH ANNUAL O&M COSTS OF $43,000.
 
Remedy:  1. OFF-GRADE BATCH PITS - EXCAVATE AND REMOVE EXISTING POLYVINYL CHLORIDE (PVC) SLUDGE AND CONTAMINATED SOILS TO THE LEVELS TO BE DETERMINED AT THE DESIGN STAGE; INSTALL A DOUBLE SYNTHETIC LINER, INSTALL MONITORING WELLS AND PERFORM QUARTERLY SAMPLE ANALYSIS FOR TRICHLOROETHYLENE (TCE), 1,2, DICHLOROETHANE (EDC) AND VINYL CHLORIDE MONOMER (VCM), THE CONTAMINANTS OF CONCERN AT THE SITE. THE EXCAVATED MATERIAL WILL BE DIRECTLY PROCESSED AND RECOVERED (ESTIMATED BY THE COMPANIES TO BE 80-85%) AS A SALEABLE FINISHED PRODUCT TO THE MAXIMUM EXTENT POSSIBLE. NON-RECOVERABLE MATERIAL WILL BE DISPOSED OF OFF-SITE AT AN APPROVED RCRA FACILITY (EST. 1 YEAR).

2. STORMWATER RESERVOIR (RV POND) - THE SAME REMEDY AS DESCRIBED FOR THE ABOVE OFF-GRADE BATCH PITS (EST. 1 YEAR).

3. UNLINED DITCHES - EXCAVATE AND REMOVE PVC SLUDGE, INSTALL A SINGLE SYNTHETIC LINER. THE EXCAVATED MATERIAL WILL BE DISPOSED OF OFF-SITE AT AN APPROVED RCRA FACILITY (EST. 8 MONTHS).

4. AERATED LAGOONS - EXCAVATE AND REMOVE PVC SLUDGE, CLEAN AND REPAIR LAGOONS AS NECESSARY, INSTALL A DOUBLE SYNTHETIC LINER, INSTALL MONITORING WELLS AND PERFORM QUARTERLY SAMPLING ANALYSIS FOR TCE, EDC AND VCM. THE EXCAVATED MATERIAL WILL BE RECOVERED TO THE MAXIMUM EXTENT POSSIBLE (ESTIMATED BY THE COMPANIES TO BE 80-85%) AND NON-RECOVERABLE MATERIAL WILL BE DISPOSED OF OFF-SITE AT AN APPROVED RCRA FACILITY (EST. 18 MONTHS).

5. CLOSED BURIED SLUDGE PITS - PLACE A DRAINAGE LAYER ON TOP OF THE EXISTING SYNTHETIC CAP, AND COVER WITH A SECOND SYNTHETIC CAP (OR COMPARABLE SUBSTITUTE IN COMPLIANCE WITH THE REQUIREMENTS OF RCRA) AND TOPSOIL AND THEN REVEGETATE (EST. 1 YEAR).

6. FORMER PVC STORAGE AREA - COVER AND CAP THE ENTIRE AREA WITH A DOUBLE SYNTHETIC CAP (OR COMPARABLE SUBSTITUTE IN COMPLIANCE WITH THE REQUIREMENTS OF RCRA) AND THEN REVEGETATE (EST. 6 MONTHS).

7. GROUNDWATER - INSTALL A LINE OF SIX GROUNDWATER RECOVERY WELLS AT THE NORTHERN EDGE OF THE CONTAMINANT PLUME, AND ANOTHER SIX WELLS AT THE SOUTHERN EDGE. REUSE THE COLLECTED GROUNDWATER IN FORMOSA'S PLANT OPERATIONS. DURING PERIODS OF LOW WATER DEMAND IN THE PLANT, TREAT THE GROUNDWATER IN THE EXISTING WASTE WATER TREATMENT PLANT. INSTALL TWO MONITORING WELLS AT THE SOUTHERN EDGE OF THE PLUME. PROVIDE AN ALTERNATE WATER SUPPLY FOR EXISTING CONTAMINATED WELLS.

8. OPERATION AND MAINTENANCE (O&M) FOR THE REMEDY WILL INCLUDE AS A MINIMUM REGULAR INSPECTIONS AND AS NECESSARY REPAIRS TO THE LINERS AND CAPS. THE GROUNDWATER RECOVERY SYSTEM WILL BE ROUTINELY MONITORED TO ASSURE THAT IT IS CAPTURING THE CONTAMINATED PLUME.
 
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