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Record of Decision System (RODS)

MIDDLETOWN AIR FIELD

Abstract

Site Name:  MIDDLETOWN AIR FIELD
Address:  APPROX 1 MLE OFF RTE 230 
City & State:  MIDDLETOWN  PA  17057
County:  DAUPHIN
 
EPA ID:  PAD980538763
EPA Region:  03
 
NPL Status:  Deleted from the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-88/039
ROD Date:  12/31/1987
Operable Unit(s):  01
 
Media:  GROUNDWATER
 
Contaminant:  VOCS (PCE, TCE)
 
Abstract:  THE MIDDLETOWN AIR FIELD SITE COVERS WHAT IS NOW THE HARRISBURG INTERNATIONAL AIRPORT (HIA), LOCATED BETWEEN THE TOWN OF MIDDLETOWN AND NIGHSPIRE, DAUPHIN COUNTY, PENNSYLVANIA. THE AIRPORT IS OWNED AND OPERATED BY THE COMMONWEALTH OF PENNSYLVANIA DEPARTMENT OF TRANSPORTATION. THE AREA SURROUNDING THE BASE IS CHARACTERIZED AS MIXED RESIDENTIAL/INDUSTRIAL. BETWEEN 1898 AND 1962, THE PROPERTY WAS OWNED BY THE U.S. GOVERNMENT AND USED BY THE MILITARY. HIA AND SEVERAL OTHER ENTITIES OCCUPY WHAT WAS REFERRED TO AS THE OLMSTED AIR FORCE BASE. IN MARCH 1983, TCE CONTAMINATION CAUSED SIX OF THE TEN ONSITE PRODUCTION WELLS SUPPLYING HIA TO BE TAKEN OUT OF SERVICE. STUDIES INITIATED UNDER THE DEPARTMENT OF DEFENSE INSTALLATION RESTORATION PROGRAM INDICATE THAT WHILE GROUND WATER CONTAMINATION DUE TO VOLATILE ORGANIC COMPOUNDS EXISTS, THE EXACT SOURCE(S) OF CONTAMINATION CANNOT BE CLEARLY DEFINED. GROUND WATER CONTAMINATION MAY RESULT FROM ONE OR MORE, POSSIBLY CURRENT, SOURCES IN THE "INDUSTRIAL AREA". TO DATE, HIA HAS BEEN ABLE TO TEMPORARILY MEET THE WATER REQUIREMENTS OF THE FACILITY BY TAKING THE MOST CONTAMINATED WELL OFF-LINE AS A POTABLE WATER SOURCE, AND BY BLENDING POTABLE WATER FROM A NUMBER OF WELLS. THE MOST PREVALENT CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER ARE VOCS INCLUDING TCE AND PCE.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES; PROVISION OF A POTABLE WATER SUPPLY; CONSTRUCTION OF A CENTRAL TREATMENT PLANT; GROUND WATER PUMP AND TREATMENT USING AIR STRIPPING; AND GROUND WATER MONITORING. THE ESTIMATED CAPITAL COST FOR THIS REMEDIAL ACTION IS $3,750,000 WITH ANNUAL O&M OF $160,000.
 
Remedy:  THIS IS AN INTERIM REMEDY WHICH FOCUSES ON THE DRINKING WATER SUPPLY AS AN OPERABLE UNIT. THE REMAINDER OF THE SITE IS UNDER INVESTIGATION AND WILL BE ADDRESSED AT A LATER DATE.

THE SELECTED REMEDY CONSISTS OF PROVIDING A POTABLE WATER SUPPLY TO THOSE SERVED BY THE HARRISBURG INTERNATIONAL AIRPORT SYSTEM. THIS WILL BE ACCOMPLISHED BY CONSTRUCTING A CENTRAL TREATMENT PLANT. WATER FROM 10 OF THE ON-SITE WELLS WILL BE COLLECTED AND THEN TREATED VIA A 2-TOWER AIR STRIPPING UNIT.
 
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