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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/R03-91/107
ROD Date:  12/17/1990
Operable Unit(s):  02
 
Media:  SOIL GROUND WATER
 
Contaminant:  VOCS, TCE, OTHER ORGANICS, PAHS, METALS, ARSENIC, CHROMIUM, LEAD
 
Abstract:  THE 500-ACRE MIDDLETOWN AIR FIELD SITE IS A FORMER MILITARY AIRFIELD LOCATED BETWEEN THE TOWNS OF HIGHSPIRE AND MIDDLETOWN IN DAUPHIN COUNTY, PENNSYLVANIA. LAND IN THE AREA IS USED PREDOMINANTLY FOR INDUSTRIAL AND COMMERCIAL PURPOSES. SEVERAL ONSITE WETLANDS AREAS, AS WELL AS THE FLOODPLAIN OF A SMALL STREAM, HAVE BEEN IDENTIFIED ONSITE. FROM 1898 TO 1917, THE SITE WAS OPERATED BY THE US ARMY AS A BASIC TRAINING CAMP. SUBSEQUENTLY, THE SITE WAS USED AS AN AIRFIELD BY THE ARMY/AIR FORCE FROM 1918 UNTIL ALL ONSITE MILITARY OPERATIONS CEASED IN 1966. SITE FEATURES INCLUDE SEVERAL PRIVATE MANUFACTURING COMPANIES, AN INACTIVE LANDFILL, AND THE HARRISBURG INTERNATIONAL AIRPORT (HIA). THE SITE WAS DIVIDED INTO FIVE DISTINCT STUDY AREAS WHERE SOIL, SEDIMENT, GROUND WATER, AND SURFACE WATER INVESTIGATIONS WERE CONDUCTED. THESE FIVE STUDY AREAS ARE; (1) THE 30-ACRE RUNWAY AREA WHERE, DURING THE MID-1940S THROUGH 1956, WASTES FROM BASE OPERATIONS WERE EITHER INCINERATED OR PLACED IN A LANDFILL; (2) THE 150-ACRE INDUSTRIAL AREA WHERE INDUSTRIAL OPERATIONS SUCH AS PAINT STRIPPING AND METAL FINISHING WERE CONDUCTED BY THE AIR FORCE; (3) THE 1-ACRE FIRE TRAINING PIT AREA WHERE COMBUSTIBLE WASTES WERE BURNED DURING MILITARY TRAINING EXERCISES; (4) THE 7-ACRE NORTH BASE LANDFILL AREA WHERE CONSTRUCTION DEBRIS AND MISCELLANEOUS DRUMS WERE DISPOSED OF FROM 1950 TO 1956; AND (5) THE MEADE HEIGHTS HOUSING AREA WHERE, PRIOR TO HOUSING CONSTRUCTION, WASTES MAY HAVE BEEN DISPOSED. BASED ON IDENTIFICATION OF ONSITE SOIL AND GROUND WATER CONTAMINATION, THE REMEDIAL ACTION FOR THE SITE WAS DIVIDED INTO FIVE OPERABLE UNITS (OUS) THAT WERE SLIGHTLY DIFFERENT FROM THE STUDY AREAS. THESE OUS AND THEIR RESPECTIVE MEDIA OF CONCERN ARE AS FOLLOWS; GROUND WATER FOR THE SITE (OU1); THE INDUSTRIAL AREA (SOIL) (OU2); THE FIRE TRAINING PIT AREA SOIL (OU3); THE NORTH BASE LANDFILL AREA (GROUND WATER) (OU4); AND MEADE HEIGHTS HOUSING AREA (SURFACE) (OU5). THIS ROD PROVIDES A FINAL REMEDY FOR OU1 THROUGH OU4, AND AN INTERIM REMEDY FOR OU5, WHICH REQUIRES ADDITIONAL INVESTIGATIONS TO DETERMINE CONTAMINATION SOURCES. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL AND GROUND WATER ARE VOCS INCLUDING TCE; OTHER ORGANICS INCLUDING PAHS; AND METALS INCLUDING ARSENIC, CHROMIUM, AND LEAD.

THE COMBINED SELECTED REMEDIAL ACTION FOR THIS SITE AT OU1 THROUGH OU5 IS CONTINUING THE OPERATION OF EXISTING DRINKING WATER SUPPLY TREATMENT SYSTEMS, WHICH INCLUDE AIR STRIPPING, FOLLOWED BY DISINFECTION, AND THE CURRENT DISTRIBUTION SYSTEM; MONITORING AND TREATING ANY ADDITIONAL SOURCE OF DRINKING WATER FROM NEW WELLS AND OTHER HIA WELLS NOT USED DURING ROUTINE OPERATIONS; RECONFIGURING HIA GROUND WATER PRODUCTION WELLS; MONITORING GROUND WATER, SURFACE WATER, SEDIMENT, AND BIOTA; PREPARING A HEALTH SAFETY PLAN FOR ANY FUTURE ACTIVITIES THAT MAY DISRUPT SURFACE SOIL; AND IMPLEMENTING INSTITUTIONAL CONTROLS INCLUDING DEED, LAND USE, AND GROUND WATER USE RESTRICTIONS THROUGHOUT THE SITE. THE ESTIMATED NET PRESENT WORTH COST FOR THE REMEDIAL ACTIONS FOR OU1 THROUGH OU4 IS $1,327,000. CAPITAL COSTS FOR OU1 THROUGH OU4 TOTAL $118,000. THERE ARE NO CAPITAL COSTS FOR OU5; BUT A NET PRESENT WORTH COST OF $55,000. TOTAL NET PRESENT WORTH COST FOR ALL FIVE OUS IS $1,382,000.

PERFORMANCE STANDARDS OR GOALS; GROUND WATER REMEDIATION GOALS FOR OU1 AND OU4 ARE BASED ON FEDERAL MCLS, AND INCLUDE LEAD 5 UG/L (PROPOSED MCL). THE STATE GROUND WATER ARAR FOR REMEDIATING THE AQUIFER TO MEET BACKGROUND LEVELS HAS BEEN WAIVED FOR TECHNICAL IMPRACTICABILITY, AND THE AQUIFER ITSELF WILL BE TREATED TO MEET MCLS.
 
Remedy:  EPA'S OVERALL STRATEGY FOR PROTECTING HUMAN HEALTH AND THE ENVIRONMENT AT THE MIDDLETOWN AIRFIELD SITE IS TO;

* PREVENT THE INGESTION OF GROUNDWATER THAT HAS CONTAMINANTS IN EXCESS OF REGULATORY DRINKING WATER STANDARDS OR CRITERIA, OR IN EXCESS OF HEALTH-BASED LEVELS;
* PREVENT HUMAN EXPOSURE TO CONTAMINATED SOIL AND DUST DURING ACTIVITIES THAT REQUIRE DISTURBANCE OF SOILS AT BOTH THE INDUSTRIAL AREA AND THE FIRE TRAINING PIT AREA; AND
* PREVENT AQUATIC ORGANISMS LIVING IN A STREAM OR RIVER ENVIRONMENT FROM BEING ADVERSELY IMPACTED BY CONTAMINANTS.

IN ORDER TO ACCOMPLISH THESE OBJECTIVES, THE MIDDLETOWN AIRFIELD SITE HAS BEEN DIVIDED INTO FIVE OPERABLE UNITS;
* OPERABLE UNIT 1; INDUSTRIAL AREA--HARRISBURG INTERNATIONAL AIRPORT (HIA) GROUNDWATER PRODUCTION WELLS
* OPERABLE UNIT 2; INDUSTRIAL AREA--SOILS
* OPERABLE UNIT 3; FIRE TRAINING PIT AREA--SOILS
* OPERABLE UNIT 4; NORTH BASE LANDFILL AREA--GROUNDWATER
* OPERABLE UNIT 5; MEADE HEIGHTS AREA--SURFACE WATER

THE SECOND AND THIRD OPERABLE UNITS PREVENT PUBLIC OR WORKER EXPOSURE TO CONTAMINATED SOIL AND DUST DURING ACTIVITIES THAT REQUIRE THE DISTURBANCE OF SOILS. THE MAJOR COMPONENTS OF THE SELECTED REMEDY FOR OPERABLE UNITS 2 AND 3 INCLUDE;
* LAND USE AND ACCESS RESTRICTIONS.
* PUBLIC AND WORKER HEALTH AND SAFETY REQUIREMENTS FOR ACTIVITIES INVOLVING CONSTRUCTION, DEMOLITION, AND EXCAVATION OR OTHER ACTIVITIES THAT WOULD DISTURB THE SITE SOIL.

SEE DECLARATION PAGE FOR REMAINDER OF INFORMATION.
 
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