Site Name: HAVERTOWN PCP
EPA ID: PAD002338010 EPA Region: 03 Metro Statistical Area: 0
EAGLE RD RC DRAWER F, HAVERFORD TWP, PA 19041
Operable Unit:
ROD ID: EPA/ROD/R03-91/131 ROD Date: 09/30/91
Contaminant: BENZENE; TCE; TOLUENE; XYLENES; OTHER ORGANICS; DIOXIN; OILS; PAHS; PCP; PHENOLS; METALS; ARSENIC
Keys: NONE
Abstract:
THE 12- TO 15-ACRE HAVERTOWN PCP SITE CONSISTS OF A FORMER WOOD TREATMENT FACILITY AND AN ADJACENT INDUSTRIAL FACILITY IN HAVERFORD TOWNSHIP, DELAWARE COUNTY, PENNSYLVANIA. LAND USE IN THE AREA IS MIXED RESIDENTIAL AND INDUSTRIAL. NAYLORS RUN, A CREEK THAT DRAINS THE ENTIRE SITE, FLOWS INTO COBBS CREEK, WHICH JOINS DARBY CREEK BEFORE ENTERING THE DELAWARE RIVER. ONLY THREE FAMILIES WHO RESIDE MORE THAN ONE MILE FROM THE SITE USE THE GROUND WATER AS THEIR DRINKING WATER SUPPLY. FROM 1947 TO 1991, NATIONAL WOOD PRESERVERS (NWP) USED THE SITE FOR TREATING WOOD. TREATED WOOD WAS AIR DRIED ON DRIP RACKS IN DIRT AREAS AROUND THE SITE AND STORED IN A DIRT-COVERED STORAGE YARD. CHEMICALS WERE STORED IN SEVERAL TANKS ADJACENT TO THE FACILITY. IT HAS BEEN ESTIMATED THAT UP TO 1 MILLION GALLONS OF SPENT WOOD PRESERVATIVES WERE DUMPED INTO A NEARBY DRIP WELL. THIS DISPOSAL PRACTICE IS BELIEVED TO BE A PRIMARY SOURCE OF CONTAMINATION TO GROUND WATER AND, ULTIMATELY, NAYLORS RUN. FROM 1962 THROUGH 1989 THE STATE CONDUCTED A NUMBER OF INVESTIGATIONS, WHICH REVEALED PCP, OILS, PAHS, DIOXIN, HEAVY METALS, VOCS, AND PHENOLS IN GROUND AND SURFACE WATER. IN 1976, EPA INITIATED A RESPONSE ACTION, WHICH INCLUDED GROUND WATER PUMPING AND TREATMENT, INSTALLING FILTER FENCES, SEALING A SANITARY SEWER, AND AN ATTEMPT TO GROUT TWO SEWER PIPES WHICH DISCHARGED INTO NAYLORS RUN. CURRENTLY, CONTAMINATED GROUND WATER STILL DISCHARGES INTO NAYLORS RUN FROM A STORM SEWER PIPE. A 1989 RECORD OF DECISION (ROD) ADDRESSED OPERABLE UNIT 1 (OU1), THE CLEANUP OF WASTES STAGED ONSITE FROM PREVIOUS INVESTIGATIVE ACTIONS, AND THE INTERIM REMEDIAL MEASURE OF DESIGNING AND INSTALLING AN OIL/WATER SEPARATOR AT THE STORM DRAIN OUTLET ALONG NAYLORS RUN. THIS ROD ADDRESSES AN INTERIM REMEDY FOR SHALLOW GROUND WATER CONTAMINATION, AS OU2. A SUBSEQUENT ROD WILL ADDRESS SEDIMENT CONTAMINATION IN NAYLORS RUN, SOIL CONTAMINATION ONSITE, POTENTIAL DEEP GROUND WATER CONTAMINATION FROM ONSITE SOIL, AND SURFACE WATER AND SEDIMENT CONTAMINATION DUE TO RUNOFF FROM ONSITE SOIL, AS OU3. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER ARE VOCS INCLUDING BENZENE, TCE, TOLUENE, AND XYLENES; OTHER ORGANICS INCLUDING DIOXIN, OILS, PAHS, PCP, AND PHENOLS; AND METALS INCLUDING ARSENIC. THE SELECTED REMEDIAL ACTION FOR THIS INTERIM REMEDY INCLUDES
* INSTALLING TWO FREE PRODUCT RECOVERY WELLS WITH FLOATING FREE PRODUCT SKIMMERS ONSITE;
* INSTALLING A SHALLOW GROUND WATER COLLECTION DRAIN AND PUMPING STATION, AS WELL AS ADDITIONAL GROUND WATER WELLS TO MONITOR SHALLOW GROUND WATER;
* REHABILITATING THE EXISTING STORM SEWER TO REDUCE INFILTRATION BY LINING THE SEWER, FOLLOWED BY DIRECTING ALL SHALLOW GROUND WATER COLLECTED TO THE EXISTING OIL/WATER SEPARATOR;
* CONSTRUCTING AN ONSITE GROUND WATER TREATMENT PLANT, WHICH WILL INCLUDE CHEMICAL PRECIPITATION TO REMOVE INORGANIC COMPOUNDS, WITH EITHER A POWDERED ACTIVATED CARBON TREATMENT (PACT) SYSTEM OR AN ADVANCED OXIDATION PROCESS (AOP), AND GRANULAR ACTIVATED CARBON TREATMENT AS A REINFORCEMENT FOR THE PACT OR AOP TO REMOVE ORGANICS AND DESTROY DIOXINS;
* TREATING EFFLUENT FROM THE OIL/WATER SEPARATOR USING THE NEW TREATMENT PLANT;
* DISCHARGING THE EFFLUENT FROM THE TREATMENT PLANT ONSITE TO SURFACE WATER
* TREATING AND DISPOSING OF ANY RESIDUALS OFFSITE; AND
* GROUND WATER MONITORING.
THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION RANGES FROM $10,036,000 TO $12,177,000, WHICH INCLUDES AN ANNUAL O&M COST RANGING FROM $485,500 TO $595,000 FOR 30 YEARS.
PERFORMANCE STANDARDS OR GOALS; CHEMICAL-SPECIFIC GROUND WATER CLEAN-UP GOALS ARE BASED ON BACKGROUND LEVELS, THE MORE STRINGENT OF SDWA MCLS OR MCLGS, OR NEW LIMITS SET FORTH IN THE FINAL REMEDIAL ACTION. GROUND WATER CLEAN-UP GOALS INCLUDE BENZENE 5 UG/L (MCL), PCP 1 UG/L (MCL), TCE 5 UG/L (MCL), TOLUENE 1,000 UG/L (MCL), XYLENES 10,000 UG/L (MCL), AND ARSENIC 50 UG/L (MCL).
Remedy:
THE PRINCIPAL THREAT AT THE SITE IS THE GROUND WATER CONTAMINATION WHICH HAS SLOWLY MIGRATED INTO THE SHALLOW GROUND WATER AQUIFER. VERY SIGNIFICANT CONCENTRATIONS OF PCP AND OTHER CHEMICALS OF CONCERN REMAIN IN THE GROUND WATER. NATURAL FLUSHING AND ATTENUATION OF THE CONTAMINATION HAS BEEN INEFFECTIVE IN REMOVING THE CONTAMINANTS TO LOW RESIDUAL LEVELS.
THIS PHASE OF WORK OR OPERABLE UNIT IS THE SECOND OF THREE PLANNED OPERABLE UNITS FOR THE SITE. THE FIRST OPERABLE UNIT REMOVED EXISTING HAZARDOUS WASTE FROM THE SITE AND INSTALLED AN OIL/WATER SEPARATOR AS A FIRST STEP IN REMOVING SOME CONTAMINANTS FROM NAYLORS RUN, A CREEK THAT DRAINS THE SITE AREA. THE SECOND OPERABLE UNIT WILL COLLECT AND TREAT THE SHALLOW GROUND WATER AQUIFER, WHICH FLOWS INTO NAYLORS RUN. THIS ACTION WILL INITIATE THE REMEDIATION OF THE SHALLOW GROUND WATER AQUIFER, IN CONJUNCTION WITH THE NEXT PLANNED OPERABLE UNIT, AND WILL ACT AS THE INITIAL STEP IN REMEDIATING THE SEDIMENT CONTAMINATION IN NAYLORS RUN. IT WILL PROTECT HUMAN HEALTH AND THE ENVIRONMENT, PRINCIPALLY CHILDREN PLAYING IN NAYLORS RUN. THIS ACTION IS CONSIDERED AN INTERIM ACTION FOR GROUND WATER BECAUSE IT ADDRESSES ONLY THE REMEDIATION OF THE SHALLOW GROUND WATER AQUIFER AND IS NOT THE PERMANENT REMEDY FOR GROUND WATER. THE THIRD OPERABLE UNIT, WHICH IS PLANNED, WILL ADDRESS SEDIMENT CONTAMINATION IN NAYLORS RUN, POTENTIAL DEEP GROUND WATER CONTAMINATION FROM SOILS ONSITE, AND SURFACE WATER AND SEDIMENT CONTAMINATION DUE TO RUNOFF FROM ONSITE SOILS. THE SECOND OPERABLE UNIT WILL REQUIRE LONG-TERM MANAGEMENT INCLUDING A PROJECTED 30 YEAR OPERATION OF A TREATMENT PLANT AND THE DISPOSAL OF WASTES GENERATED BY THAT PLANT. THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE THE FOLLOWING:
* INSTALLATION OF FREE PRODUCT RECOVERY WELLS ON THE NATIONAL WOOD PRESERVERS (NWP) PROPERTY.
* REHABILITATION OF THE EXISTING STORM SEWER LINE TO REDUCE INFILTRATION OF CONTAMINANTS FROM THE GROUND WATER TO THE STORM SEWER.
* INSTALLATION OF A GROUND WATER COLLECTION DRAIN ADJACENT TO THE EXISTING STORM SEWER LINE UNDER THE BACKYARDS OF RESIDENTIAL PROPERTIES TO COLLECT GROUND WATER FOR TREATMENT AT A TREATMENT PLANT.
* INSTALLATION OF A GROUND WATER TREATMENT PLANT AT NWP TO PERFORM CHEMICAL PRECIPITATION, EITHER POWDERED ACTIVATED CARBON TREATMENT OR AN ADVANCED OXIDATION TREATMENT AND FINALLY
* GRANULATED ACTIVATED CARBON TREATMENT.
THESE PROCESSES SHOULD FULLY TREAT THE GROUND WATER PRIOR TO DISCHARGE BACK TO NAYLORS RUN.