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Site Name:  MIDCO I
Address:  7400 W 15TH AVE 
City & State:  GARY  IN  46401
County:  LAKE
EPA ID:  IND980615421
EPA Region:  05
NPL Status:  Currently on the Final NPL
ROD Type:  Amendment
ROD ID:  EPA/AMD/R05-92/196
ROD Date:  04/13/1992
Operable Unit(s):  01
Media:  Subsurface Soil, Sediment, Groundwater
Contaminant:  VOCS, Metals, Inorganics
Abstract:  SITE HISTORY/DESCRIPTION: The 4-acre MIDCO I site is an abandoned, industrial waste recycling, storage, and disposal facility in Gary, Indiana. The surrounding land use is mixed industrial, commercial, and residential. The nearest residential area is about 1/4-mile west of the site. The Calumet Aquifer underlies the site and provides drinking water to wells within 1 mile of the site. From 1973 to 1979, two different owners operated the facility and stockpiled thousands of drums of bulk liquid and chemical waste. In 1976, a fire at the site destroyed an estimated 14,000 waste drums. In 1981, EPA installed a fence around the site. In 1982, EPA removed all surface wastes, including thousands of drums and an underground storage tank; excavated and disposed of contaminated surface soil;and placed a clay cover over much of the site. This ROD amends a 1989 ROD that addressed the remaining contaminated soil and ground water by treatment of an estimated 12,400 cubic yards of soil using soil vapor extraction and solidification/stabilization, followed by onsite disposal; excavation and solidification/stabilization of an estimated 1,200 cubic yards of contaminated sediments, followed by onsite disposal; and covering the site in accordance with RCRA landfill closure requirements; ground water pumping and injection into a shallow or deep aquifer. The amended remedy reduces the estimated amount of soil to be treated, as a result of new information on arsenic data and amended soil CALs; further defines the site cover requirements; and further defines the requirements of deep well injection of contaminated ground water. The primary contaminants of concern affecting the subsurface soil, sediment, and ground water are VOCs, including TCE, toluene, and xylenes; metals, including chromium and lead; and inorganics. PERFORMANCE STANDARDS OR GOALS: Ground water clean-up standards for the Calumet Aquifer are not changed from the 1989 ROD. Treatment requirements prior to DWI are further defined compared to the 1989 ROD and include, at a minimum, treatment to MACs, which are required for RCRA delisting. Specific MACs include methylene chloride 31.5 ug/l; trichloroethene 31.5 ug/l; toluene 6,300 ug/l; chromium 630 ug/l; nickel 630 ug/l; and lead 950 ug/l. Treatment below MACs will be required, if necessary, to protect underground sources of drinking water. Soil treatment action levels are increased from 1x10[-6] and HI = 1 in the 1989 ROD to 5x10[-4] and HI = 5 in this amendment INSTITUTIONAL CONTROLS: Institutional controls including access and deed restrictions will be implemented to protect the integrity of the site cover and operational aspects of the remedy.
Remedy:  SELECTED REMEDIAL ACTION: The amended remedial action for this site includes reducing theamount of soil to be treated to a minimum of 5,200 cubic yards because of the amendment to soil CALs and the determination that arsenic may not be present above background levels at the site; treating thecontaminated soil onsite using with soil vapor extraction, followed by in- situ solidification/stabilization; excavating and treating an estimated 500 cubic yards of contaminated sediment from the surrounding wetlands onsite using solidification/stabilization; pumping and treatment of contaminated ground water using air stripping and carbon absorption, followed by onsite deep well injection; constructing a final RCRA cover over the entire site; implementing institutional controls including deed restrictions, and site access restrictions; conducting long-term monitoring and providing for a contingency remedy in the event that ground water clean-up action levels for the Calumet Aquifer are technically impracticable to attain, which includes low-level pumping to contain contaminated ground water and additional institutional controls. The ground water treatment or underground injection portions of this remedy may be combined with remedial actions for the nearby Midco II site. The estimated present worth cost for this amended remedial action is $10,000,000, which includes an annual O&M cost of $460,000.
Text:  View full-text ROD [ 71K ]
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