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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/R08-90/031
ROD Date:  09/28/1990
Operable Unit(s):  05
 
Media:  SOIL
 
Contaminant:  ORGANICS, PESTICIDES, METALS, ARSENIC, CHROMIUM
 
Abstract:  THE SAND CREEK INDUSTRIAL SITE IS CHEMICAL MANUFACTURING FACILITY IN COMMERCE CITY, ADAMS COUNTY, COLORADO. LAND USE IN THE AREA SURROUNDING THE SITE IS PRIMARILY INDUSTRIAL AND RESIDENTIAL WITH 13 RESIDENTS ONSITE. PRODUCTION WELLS NORTH AND DOWNGRADIENT OF THE SITE SUPPLY DRINKING WATER TO THE COUNTY. THE SAND CREEK INDUSTRIAL SITE LIES IN THE VICINITY OF THREE OTHER SUPERFUND SITES: WOODBURY CHEMICAL, CHEMICAL SALES, AND ROCKY MT. ARSENAL. BEGINNING IN THE 1960S, THE COLORADO ORGANIC CHEMICAL COMPANY (COC) CONDUCTED PESTICIDE MANUFACTURING OPERATIONS ONSITE. DISPOSAL AND ONSITE STORAGE AREAS INCLUDE A LANDFILL AND ACID PITS. ONSITE FIRES IN 1968 AND 1977, AS WELL AS IMPROPER PESTICIDE STORAGE PRACTICES, RESULTED IN PESTICIDE-CONTAMINATED SOIL, GROUND WATER, AND SURFACE WATER. IN 1978, COC REMOVED SOME CONTAMINATED SOIL, AND IN 1984, COC REMOVED DRUMMED WASTES, EXCESS PRODUCT, ADDITIONAL CONTAMINATED SOIL, AND IMPLEMENTED SITE ACCESS RESTRICTIONS INCLUDING FENCING. THE SITE HAS BEEN DIVIDED INTO SIX OPERABLE UNITS (OU) TO FACILITATE REMEDIATION. A 1989 RECORD OF DECISION (ROD) ADDRESSED OU1, WHICH INCLUDED REMEDIATING SOME OF THE SUBSURFACE SOIL. THIS SECOND ROD ADDRESSES OU5, AND INCLUDES THE FINAL RESPONSE ACTION FOR THE 14,000 CUBIC YARDS OF CONTAMINATED SOIL PRESENT ONSITE AT THE COC AREA. SUBSEQUENT RODS WILL ADDRESS THE REMAINING CONTAMINATION INCLUDING THE LANDFILL, ACID PITS, AND GROUND WATER. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL ARE ORGANICS INCLUDING PESTICIDES; AND METALS INCLUDING ARSENIC AND CHROMIUM.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES EXCAVATING APPROXIMATELY 14,000 CUBIC YARDS OF SURFACE SOIL ABOVE THE HEALTH-BASED ACTION LEVELS, TREATING THE SOIL ONSITE USING SOIL WASHING AND SUBSEQUENTLY BACKFILLING THE TREATED SOIL ONSITE; GRADING AND REVEGETATING THE SITE; INCINERATING THE SOIL WASHING WASTEWATER OFFSITE; AND GROUND WATER MONITORING. THE ESTIMATED PRESENT WORTH COST FOR THIS SELECTED REMEDIAL ACTION IS $4,490,734, WHICH INCLUDES AN ESTIMATED ANNUAL O&M COST OF $20,000 FOR 30 YEARS.

PERFORMANCE STANDARDS OR GOALS: REMEDIATION GOALS ARE BASED ON HEALTH-BASED ACTION LEVELS OR RCRA TREATABILITY VARIANCE ACTION LEVELS, WHICHEVER IS MORE STRINGENT. HEALTH-BASED ACTION LEVELS WERE ESTABLISHED FOR SOIL BASED ON A (10-6) CANCER RISK AND INCLUDE DIELDRIN 0.155 MG/KG AND HEPTACHLOR 0.553 MG/KG. TREATABILITY VARIANCE ACTION LEVELS WERE ESTABLISHED FOR ARSENIC (90-99 PERCENT REDUCTION), CHROMIUM 0.5-0.6 MG/L (TCLP), CHLORDANE (90-99 PERCENT REDUCTION), 2,4-D (90-99 PERCENT REDUCTION) AND 4,4-DDT 0.5-20 MG/L (TOTAL WASTE ANALYSIS). INSTITUTIONAL CONTROLS: NOT APPLICABLE.
 
Remedy:  THE SELECTED REMEDY WILL ADDRESS THE PRINCIPAL THREATS POSED BY THE SHALLOW SOILS AND WILL PROTECT GROUNDWATER RESOURCES AND PREVENT DIRECT CONTACT RISKS THROUGH THE TREATMENT AND DISPOSAL OF CONTAMINATED SOILS. THE REMEDY WILL ENSURE THE LONG-TERM PROTECTION FOR THE PUBLIC AND THE ENVIRONMENT THROUGH TREATMENT OF HAZARDOUS SUBSTANCES. THE SELECTED REMEDY, SOIL WASHING, IS AN INNOVATIVE TREATMENT TECHNOLOGY AND IS DETERMINED TO BE THE MOST APPROPRIATE REMEDY FOR THE OPERABLE UNIT.

ELEMENTS OF THE SELECTED REMEDY ARE;
* EXCAVATION OF CONTAMINATED SURFACE SOILS WHICH ARE CONTAMINATED IN EXCESS OF ACTION LEVELS DESCRIBED IN TABLE 7.
* SOIL WASHING OF THE EXCAVATED SOIL TO TREATMENT LEVELS DESCRIBED IN TABLE 8.
* INCINERATION OF WASTEWATER.
* BACKFILL OF THE TREATED SOIL.
* GRADING AND REVEGETATING THE SOIL.
 
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