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Record of Decision System (RODS)

SAND CREEK INDUSTRIAL

Abstract

Site Name:  SAND CREEK INDUSTRIAL
Address:  33RD AND DAHLIA 
City & State:  COMMERCE CITY  CO  80022
County:  ADAMS
 
EPA ID:  COD980717953
EPA Region:  08
 
NPL Status:  Deleted from the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R08-89/024
ROD Date:  09/29/1989
Operable Unit(s):  01
 
Media:  SOIL DEBRIS
 
Contaminant:  VOCS, PCE, TCE, OTHER ORGANICS, PESTICIDES
 
Abstract:  THE SAND CREEK INDUSTRIAL SITE IS IN COMMERCE CITY, ADAMS COUNTY, COLORADO. LAND USE IN THE VICINITY OF THE SITE IS INDUSTRIAL, INCLUDING TRUCKING FIRMS, PETROLEUM AND CHEMICAL PRODUCTION AND SUPPLY COMPANIES, WAREHOUSES, SMALL BUSINESSES AND SEVERAL RESIDENCES. THE SITE CONTAINS THE PROPERTY AND BUILDINGS OF THE COLORADO ORGANIC CHEMICAL COMPANY (COC) AND APPROXIMATELY 13 RESIDENCES. PRODUCTION WELLS NORTH AND DOWNGRADIENT OF THE STUDY AREA ARE THE SOURCE OF WATER SUPPLY TO THE COUNTY. PESTICIDE MANUFACTURING OPERATIONS BEGAN AT COC IN THE 1960S. FIRES IN 1968 AND 1977 AND IMPROPER PESTICIDE STORAGE PRACTICES RESULTED IN HIGH LEVELS OF ORGANIPHOSPHATE PESTICIDES, CHLORINATED HYDROCARBONS, AND THERMALLY-ALTERED PESTICIDES BEING RELEASED AT THE SITE. IN 1978 COC REMOVED SOME CONTAMINATED SOIL, AND IN 1984 COC REMOVED DRUMS OF WASTE, EXCESS PRODUCT, AND CONTAMINATED SOIL, AND INSTALLED FENCING AT THE SITE IN RESPONSE TO AN EPA ORDER. THIS RECORD OF DECISION REPRESENTS THE FIRST OF FIVE PLANNED OPERABLE UNITS FOR THE SITE AND ADDRESSES SOIL, BUILDINGS, AND TANKS CONTAMINATED BY PESTICIDES, VOLATILE ORGANICS, AND METALS. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL, ONSITE BUILDINGS, AND TANKS ARE VOCS INCLUDING TCE AND PCE; AND OTHER ORGANICS INCLUDING PESTICIDES.

THE SELECTED REMEDIAL ACTION FOR THE SITE INCLUDES IN SITU VACUUM EXTRACTION TO REMOVE VOCS FROM CONTAMINATED SOIL AND ONSITE TREATMENT OF OFF-GAS BY AIR STRIPPING; EXCAVATION AND OFFSITE INCINERATION OF APPROXIMATELY 1,000 CUBIC YARDS OF SOIL CONTAMINATED WITH GREATER THAN 1000 MG/KG HALOGENATED ORGANIC COMPOUNDS (HOC), WITH OFFSITE RESIDUAL DISPOSAL IN A RCRA LANDFILL; BACKFILLING OF EXCAVATED AREAS WITH CLEAN SOIL; DEMOLITION AND OFFSITE DISPOSAL OF BUILDINGS IN CONFORMANCE WITH LAND DISPOSAL REGULATIONS; AND GROUND WATER MONITORING AT THE SITE FOR 30 YEARS FOLLOWING REMEDIATION. THE ESTIMATED PRESENT WORTH COST FOR THE SELECTED REMEDY IS $5,349,600.
 
Remedy:  THE REMEDY SELECTED FOR OU1 ADDRESSES SOILS, BUILDINGS, AND TANKS CONTAMINATED WITH PESTICIDES AND VOLATILE ORGANIC CHEMICALS. THE REMEDIES FOR THE OTHER OPERABLE UNITS OF THE SAND CREEK INDUSTRIAL SITE WILL BE ADDRESSED IN SEPARATE RECORD OF DECISION DOCUMENTS. THE ACTION DESCRIBED HEREIN REPRESENTS A REMEDIAL ACTION TO CONTROL THE SOURCE OF SOIL CONTAMINATION BY ADDRESSING THE PRINCIPAL THREATS OF CONTAMINATED SOIL TO GROUNDWATER, SURROUNDING POPULACE, AND ON-SITE WORKERS. THE COMPONENTS ASSOCIATED WITH THIS REMEDY ARE:

* EXCAVATION AND OFF-SITE INCINERATION OF APPROXIMATELY 1,000 CUBIC YARDS OF SOILS HEAVILY CONTAMINATED WITH HALOGENATED ORGANIC COMPOUNDS (HOCS), AND DISPOSAL OF INCINERATED SOIL RESIDUALS IN A RCRA SUBTITLE C MINIMUM TECHNOLOGY LANDFILL, IN CONFORMANCE WITH THE LAND DISPOSAL RESTRICTIONS.
* BACKFILLING OF EXCAVATED AREAS WITH CLEAN SOIL.
* VACUUM EXTRACTION OF VOLATILE ORGANICS IN SOILS.
* DEMOLITION AND OFFSITE DISPOSAL OF BUILDINGS IN CONFORMANCE WITH THE LAND DISPOSAL REGULATIONS.

THE REMEDY SELECTED FOR OU1 IS CONSISTENT WITH OVERALL REMEDIATION GOALS FOR THE SAND CREEK INDUSTRIAL SITE. THE REMEDIAL ACTION WILL ADDRESS A SIGNIFICANT PORTION OF CONTAMINATED SOILS FROM THE SITE WHICH ARE A POTENTIAL SOURCE OF GROUNDWATER CONTAMINATION AND ADJACENT SURFACE SOIL CONTAMINATION. PRESENT NET WORTH COST OF THE REMEDIAL ACTIONS DESCRIBED IN THIS ROD TO CLEAN-UP CONTAMINATED SOILS AT OU1 ARE $5,349,600. GROUNDWATER CONTAMINATION (OPERABLE UNIT NO. 4) WILL BE MOST EFFECTIVELY IMPLEMENTED WHEN SOURCES OF CONTAMINATION HAVE BEEN REMEDIATED.

IN ADDITION TO THE 1000 CUBIC YARDS ADDRESSED BY THIS ROD, APPROXIMATELY 38,000 CUBIC YARDS OF SOIL CONTAMINATED WITH LESSER LEVELS OF HOCS WITHIN THE OU1 AREA WILL REQUIRE TREATABILITY STUDIES. REMEDIATION OF THESE SOILS (HEREAFTER CONSIDERED OU5) WILL PROCEED SEPARATE FROM OU1 REMEDIATION ACTIVITIES.

THE SELECTED REMEDY WILL PROTECT GROUNDWATER RESOURCES AND PREVENT DIRECT CONTACT RISKS THROUGH THE REMOVAL AND SUBSEQUENT DESTRUCTION OR DISPOSAL OF CONTAMINATED SOILS. THE SELECTED REMEDY WILL ENSURE THE LONG-TERM PROTECTION FOR THE PUBLIC AND THE ENVIRONMENT THROUGH DESTRUCTION OR CONTAINMENT OF HAZARDOUS SUBSTANCES. INCINERATION WILL BE USED TO DESTROY HIGHLY HOC-CONTAMINATED SOILS.
 
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