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Record of Decision System (RODS)

HENDERSON ROAD

Abstract

Site Name:  HENDERSON ROAD
Address:  372 S HENDERSON ROAD 
City & State:  UPPER MERION TOWNSHIP  PA  19406
County:  MONTGOMERY
 
EPA ID:  PAD009862939
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-88/049
ROD Date:  06/30/1988
Operable Unit(s):  01
 
Media:  GROUNDWATER SEDIMENTS
 
Contaminant:  ORGANICS, VOCS
 
Abstract:  THE HENDERSON ROAD SITE IS AN ACTIVE WASTE FACILITY SITUATED ON 7.6 ACRES OF LAND IN UPPER MERION TOWNSHIP, PENNSYLVANIA. THE LAND IN THE VICINITY OF THE SITE IS ZONED FOR LIGHT INDUSTRIAL, HEAVY INDUSTRIAL AND RESIDENTIAL USE. THE SITE IS APPROXIMATELY 2,000 FEET SOUTH AND UPGRADIENT OF THE UPPER MERION RESERVOIR (UMR), WHERE GROUNDWATER IS PART OF A PUBLIC WATER SUPPLY SERVING 228,000 CUSTOMERS. A WATER SUPPLY WELL 350 FEET SOUTHEAST AND UPGRADIENT OF THE SITE SERVES 15 EMPLOYEES OF A LUMBER COMPANY. THE SITE AREA IS ALSO CHARACTERIZED BY SINKHOLES RESULTING FROM DISSOLUTION AND SUBSEQUENT COLLAPSE OF THE DOLOMITE AND LIMESTONE BEDROCK. THE O'HARA SANITATION COMPANY (OSL) PRESENTLY OCCUPIES THE SITE WITH SEVERAL AUTOMOBILE REPAIR SHOPS AND A DRILLING CONTRACTOR. THE OSL PRESENTLY CONDUCTS ONSITE WASTE STORAGE AND WASTE RECYCLING OPERATIONS. AN ANONYMOUS PHONE CALL TO THE PENNSYLVANIA DEPARTMENT OF ENVIRONMENTAL RESOURCES (PADER) IN 1977 STATED THAT ABM DISPOSAL SERVICE COMPANY TRANSPORTED AND THEN INJECTED INDUSTRIAL WASTE INTO A WELL LOCATED INSIDE THE OSL MAINTENANCE GARAGE. LIMITED INFORMATION IS AVAILABLE ON THE TYPES OR VOLUMES OF MATERIALS DISPOSED OF BEFORE PADER WAS NOTIFIED OF INJECTION ACTIVITIES AT THE SITE. RESULTS OF PADER AND EPA SAMPLING CONDUCTED BETWEEN 1977 AND 1981, AND GROUNDWATER MONITORING CONDUCTED IN 1986 REVEALED THE PRESENCE OF ORGANIC AND VOC CONTAMINATION BOTH ON AND OFF-SITE. OF THE 35 CHEMICALS OF CONCERN IDENTIFIED AT THE SITE, FIFTEEN WERE FOUND IN UMR IN 1986. CERTAIN SITE-RELATED CHEMICALS ALSO HAVE BEEN DETECTED BETWEEN THE SITE, UMR, AND THE ADJACENT WATER SUPPLY WELL. ADDITIONALLY, THE SITE IS LOCATED IN AN AREA OF REGIONAL GROUNDWATER CONTAMINATION. STUDIES ALSO INDICATE THAT THE CENTRAL PLUME OF CONTAMINATION FROM THE SITE HAS NOT YET REACHED THE UMR, BASED ON AN ESTIMATED TRAVEL TIME FOR GROUNDWATER FROM THE SITE TO REACH UMR. HOWEVER, ONSITE GROUNDWATER IS STILL HIGHLY CONTAMINATED AND THE EXTENT OF CONTAMINATION IN THE ROCKS AND FRACTURES IN THE UNSATURATED BEDROCK HAS NOT BEEN FULLY CHARACTERIZED. A POTENTIAL MIGHT EXIST FOR INCREASED OFFSITE LOADING TO THE GROUNDWATER. THE PRIMARY CONTAMINANTS OF CONCERN INCLUDE VOCS AND ORGANICS.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES: INSTALLATION OF ON-SITE AND DOWNGRADIENT (IF NECESSARY) GROUNDWATER RECOVERY WELLS AND TREATMENT USING AIR STRIPPING WITH PROBABLE DISCHARGE TO AN ADJACENT STREAM, AND POSSIBLE DISCHARGE OF A PORTION OF THE TREATED GROUNDWATER ONTO AN AREA NEAR THE INJECTION WELL AS PART OF THE UNSATURATED ZONE TREATMENT (SOIL FLUSHING); CLOSURE OF THE INJECTION WELL; EXCAVATION OF CONTAMINATED OIL PIT SEDIMENTS AND REMOVAL OF SIGNIFICANT WASTE, IF FEASIBLE, DIRECTLY OUT OF THE INJECTION WELL; INSTALLATION, OPERATION AND MAINTENANCE OF A CARBON ADSORPTION WATER TREATMENT SYSTEM AT AN AFFECTED OFFSITE ACTIVE WELL; DEED RESTRICTIONS AFFECTING GROUNDWATER USAGE; GROUNDWATER MONITORING; COLLECTION AND EVALUATION OF DATA DURING RD/RA PHASE FOR POSSIBLE PILOT TESTING OF IN-SITU VOLATILIZATION (ISV) OF VOCS OR ANOTHER APPROPRIATE TREATMENT TECHNOLOGY IN THE UNSATURATED ZONE; AND PERIODIC REEVALUATION OF CLEANUP GOALS. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION RANGES FROM $5,500,000 (WITHOUT ISV, UNSATURATED ZONE TREATMENT OR DOWNGRADIENT PUMP AND TREATMENT) AND $12,200,000 (WITH ISV).
 
Remedy:  THIS OPERABLE UNIT IS THE FIRST OF TWO OPERABLE UNITS THAT ADDRESS CONTAMINATION AT THE SITE. THIS OPERABLE UNIT ADDRESSES THE SOURCE OF THE CONTAMINATION BY REMEDIATION OF THE ON-SITE GROUNDWATER AND SHALLOW CONTAMINATED SEDIMENTS, POSSIBLE REMOVAL AND TREATMENT OF A SOURCE OF CONTAMINATION IN THE UNSATURATED ZONE, AND POSSIBLE REMEDIATION OF THE DOWNGRADIENT CONTAMINANT PLUME. THE FUNCTION OF THIS OPERABLE UNIT IS TO ADDRESS GROUNDWATER CONTAMINATION CAUSED BY INJECTION OF HAZARDOUS SUBSTANCES INTO THE O'HARA SANITATION COMPANY GARAGE WELL (THE "INJECTION WELL") PRIOR TO 1977 AND REDUCE THE RISKS ASSOCIATED WITH EXPOSURE TO GROUNDWATER CONTAMINATED FROM THE INJECTION WELL. THE SECOND OPERABLE UNIT, THE LANDFILL OPERABLE UNIT, WILL ADDRESS SURFACE WATER, AIR, AND GROUNDWATER POTENTIALLY IMPACTED BY PREVIOUS LANDFILLING AND TRENCHING ON-SITE, IN ADDITION TO POTENTIAL LEAKAGE FROM ON-SITE UNDERGROUND STORAGE TANKS.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE;
 
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