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Record of Decision System (RODS)

SAND, GRAVEL AND STONE

Abstract

Site Name:  SAND, GRAVEL AND STONE
Address:  RTE 40 
City & State:  ELKTON  MD  21921
County:  CECIL
 
EPA ID:  MDD980705164
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-90/098
ROD Date:  09/28/1990
Operable Unit(s):  02
 
Media:  GROUNDWATER
 
Contaminant:  VOCS, BENZENE, TOLUENE, METALS
 
Abstract:  THE 200-ACRE SAND, GRAVEL AND STONE SITE IS A FORMER SAND AND GRAVEL QUARRY THREE MILES WEST OF THE TOWN OF ELKTON, IN CECIL COUNTY, MARYLAND, ALONG A TRIBUTARY TO MILL CREEK. SURFACE WATER IN MILL CREEK EVENTUALLY FLOWS TO THE ELK RIVER AND THE CHESAPEAKE BAY. BEGINNING IN 1969, HAZARDOUS MATERIALS WERE DISPOSED OF ONSITE. IN 1974, A POOL OF CHEMICAL WASTE BURNED IN A ONSITE FIRE, THE CAUSE OF WHICH HAS YET TO BE DETERMINED. SUBSEQUENTLY, 200,000 GALLONS OF THIS LIQUID WASTE WAS REMOVED TO AN OFFSITE LANDFILL AND THE REMAINING DRUMS AND SLUDGE WERE BURIED ONSITE IN TWO EXCAVATED PITS (EASTERN AND WESTERN). THE SITE HAS BEEN SEPARATED INTO THREE OPERABLE UNITS (OU). A 1985 RECORD OF DECISION (ROD) ADDRESSED OU1, THE REMEDIATION OF SHALLOW GROUND WATER CONTAMINATION NEAR THE EASTERN EXCAVATED PIT, SOURCE CONTROL (I.E., REMOVAL OF BURIED DRUMS), AND SITE ACCESS RESTRICTIONS. THIS ROD FOCUSES ON OU2, THE THREAT POSED BY SOIL AND GROUND WATER CONTAMINATION MIGRATING FROM THE EASTERN PORTION OF THE SITE, INCLUDING REMEDIATION OF GROUND WATER CONTAMINATION IN THE LOWER AQUIFERS IF NEEDED, AND EVALUATION OF CONTAMINANT SOURCES NEAR THE WESTERN EXCAVATION PIT. SOIL SAMPLING ANALYSES AND GEOPHYSICAL STUDIES NOW SHOW THAT THERE ARE NO UNACCEPTABLE RISKS ASSOCIATED WITH SOIL IN THE WESTERN AREA OF THE SITE. A FUTURE ROD WILL ADDRESS OU3, THE CONTAMINATED SOIL, SOURCE CONTROL, FINAL SITE CLOSURE, AND POST-CLOSURE OPERATION AND MAINTENANCE ACTIVITIES. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER ARE VOCS, INCLUDING BENZENE AND TOLUENE; AND METALS.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES ONSITE AND OFFSITE GROUND WATER MONITORING. IF THIS MONITORING DATA DEMONSTRATE THAT REMEDIATION IS REQUIRED, GROUND WATER MAY BE TREATED EITHER ONSITE, OR OFFSITE AT POINT OF USE, AND BOTTLED WATER WILL BE SUPPLIED TO AFFECTED RESIDENCES AND BUSINESSES. THE ONSITE TREATMENT SYSTEM INSTALLED AS A RESULT OF THE FIRST REMEDIAL ACTION WOULD BE EXPANDED AND MODIFIED, AS NECESSARY, TO TREAT THE GROUND WATER IN THE LOWER AQUIFER. TREATMENT MEASURES MAY UTILIZE GRANULAR ACTIVATED CARBON, AIR STRIPPING, ION EXCHANGE, OR ANY COMBINATION OF THESE TECHNIQUES. THE ESTIMATED PRESENT WORTH COST OF THIS REMEDIAL ACTION RANGES FROM $702,000 TO $7,125,000, DEPENDING ON THE EXTENT AND NATURE OF TREATMENT REQUIRED, AND AN ANNUAL O&M COST RANGING FROM $102,000 TO $625,900 FOR 30 YEARS. PERFORMANCE STANDARDS OR GOALS: ACTION LEVELS THAT WILL TRIGGER THE IMPLEMENTATION OF ONSITE AND/OR OFFSITE GROUND WATER TREATMENT INCLUDE CONCENTRATIONS OF CHEMICALS OF CONCERN IN EXCESS OF MCLS, A CUMULATIVE CARCINOGENIC RISK IN EXCESS OF (10-4), OR A NON-CARCINOGENIC HAZARD INDEX GREATER THAN 1.0.
 
Remedy:  THE REMEDY FOR OPERABLE UNIT TWO WAS SELECTED AFTER A CAREFUL EVALUATION OF THE OVERALL CONDITIONS AT THE SITE. THE SOIL AND GROUNDWATER IN THE UPPERMOST AQUIFER IN THE EASTERN EXCAVATED AREA OF THE SITE ARE HIGHLY CONTAMINATED WITH A VARIETY OF ORGANIC AND INORGANIC COMPOUNDS. THE SOIL AND GROUNDWATER IN THIS AREA WILL CONTINUE TWO ACT AS A SOURCE UNTIL THIS SOURCE IS REMOVED OR CONTROLLED, EITHER AS PART OF OPERABLE UNIT ONE OR OPERABLE UNIT THREE.

THE REMEDY SELECTED FOR OPERABLE UNIT TWO ADDRESSES THE THREAT POSED BY THE EXISTING SOIL AND GROUNDWATER CONTAMINATION IN THE EASTERN PORTION OF THE SITE. ALTHOUGH TO DATE, THE MIGRATION OF CONTAMINATION FROM THE UPPERMOST AQUIFER APPEARS TO BE LIMITED, THE SELECTED REMEDY WILL PUT IN PLACE A SYSTEM TO MONITOR AND TREAT CONTAMINATED GROUNDWATER THAT DOES MIGRATE INTO THE DEEPER AQUIFERS OR OFFSITE.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY ARE;

* ONSITE AND OFFSITE GROUNDWATER MONITORING
* ONSITE AND/OR OFFSITE POINT-OF-USE TREATMENT IF DETERMINED NECESSARY BASED ON GROUNDWATER MONITORING DATA.
 
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