Site Name: REDWING CARRIERS, INC. (SARALAND)
EPA ID: ALD980844385 EPA Region: 04 Metro Statistical Area: 5160
527 US HWY 43, SARALAND, AL 36571
Operable Unit: 01
ROD ID: EPA/ROD/R04-93/133 ROD Date: 12/15/92
Contaminant: VOCs, Metals
Keys: Benzene; Carcinogenic Compounds; Chromium; Clean Air Act; Clean Water Act; Debris; Deferred Decision; Direct Contact; Drinking Water Contaminants; Excavation; Filling; Ground Water; Ground Water Monitoring; Ground Water Treatment; MCLs; MCLGs; Metals; Natural attenuation; O&M; Offsite Discharge; Offsite Disposal; Offsite Treatment; Onsite Discharge; Public Exposure; Publicly Owned Treatment Works (POTW); RCRA; Relocation; Safe Drinking Water Act; Sediment; Sludge; Soil; Solidification/Stabilization; Solvents; State Standards/Regulations; Temporary Storage; Treatment Technology; VOCs; Water Quality Criteria
Abstract:
The 5.1-acre Redwing Carriers/Saraland site is a former trucking terminal and current apartment complex located in Saraland, Mobile County, Alabama. Land use in the area is predominantly residential, with wetlands and woodlands situated near the site, and three layers of hydrogeologic units, including an alluvial and surficial aquifer, beneath the site. The estimated 160 people who reside onsite in the Saraland Apartment complex use wells located to the north of the site to obtain their drinkingwater supply, and although not currently utilized, the alluvial and surficial aquifers are a potential source of drinking water. There are one grass-covered and two concrete-lined drainage ditches onsite that eventually empty into the Norton Creek. From 1961 to 1971, Redwing Carriers operated a trucking company that transported substances such as asphalt, diesel fuel, chemicals, and pesticides from local plants and that used the site as a terminal for cleanup, repairing, and parking the fleet of trucks. Sometimes during the cleanup process, untreated substances were released sometimes directly into the ground. Many of the contaminants likely were diluted and washed away during storm events; however, many of them adhered to the asphalt, which was deposited later across the property during maintenance operations. In 1971, Redwing Carriers sold the property, which was converted into an apartment complex. In 1984, the State investigated complaints about a tar-like sludge oozing to the surface at numerous locations. In 1985, EPA studies detected high concentrations of 1,2,4-trichlorobenzene and naphthalene in the soil and in leachate coming from the sludge, which has been related to onsite ground water contamination. Subsequently, EPA required Redwing to remove any visible sludge detected on the surface of the site. This ROD addresses the first and final remedial action for the contaminated source material and ground water affecting the surficial and alluvial aquifers as a drinking water source. The primary contaminants of concern affecting the soil, sediment, debris, sludge, and ground water are VOCs, including benzene; and metals, including chromium. SELECTED REMEDIAL ACTION: The selected remedial action for this site includes temporarily relocating onsite residents during excavation; removing buildings or onsite structures as needed to facilitate excavation; excavating contaminated soil, sediment, and sludge until the remaining source material achieves excavation levels; staging and temporarily storing the excavated material onsite; treating the surface soil, sediment, and sludge offsite using thermal treatment, if necessary; dewatering and solidifying the subsurface soil offsite, if necessary, before disposing of the residuals in an offsite landfill; analyzing, treating, and discharging the water from the dewatering process in an appropriate manner; removing, sorting, and treating offsite, if necessary, all contaminated debris, including sidewalk slabs and pavement areas; backfilling excavated areas with clean material; extracting approximately 12,000,000 gallons of contaminated ground water from the surficial aquifer using extraction wells and french drains and treating it onsite using biological treatment and sand/activated carbon filtration, with a supplemental treatment step, if necessary, to remove contaminants not affected by biotreatment; discharging the treated ground water offsite to a POTW or onsite to nearby surface water; disposing of residual sludge and spent carbon offsite in an approved facility; allowing for natural attenuation of the alluvial ground water; and monitoring the surface soil, sludge seeps, and ground water in the alluvial aquifer to monitor the natural attenuation process. The estimated present worth cost for this remedial action is $7,002,562, which includes an estimated present worth O&M cost of $518,000. PERFORMANCE STANDARDS OR GOALS: Soil, sediment, and sludge cleanup goals and excavation levels are based on a human health risk from inhalation or ingestion and ground water protection with a cleanup level of 15 ug/l for lead. Chemical-specific goals include acetone 36 ug/kg; aldrin 4 ug/kg; alpha-BHC 0.5 ug/kg; benzo(a)anthracene 1,025 ug/kg; benzo(a)pyrene 94.9 ug/kg; benzo(b)fluoranthene 540 ug/kg; carbon tetrachloride 9,590 ug/kg; chloroform 70 ug/kg; chromium 47,000 ug/kg; chrysene 362 ug/kg; 4,4-DDT 566 ug/kg; dieldrin 0.1 ug/kg; gamma-BHC 3.2 ug/kg; methylene chloride 0.6 ug/kg; nickel 30,000 ug/kg; vanadium 156,000 ug/kg; and vernolate 55 ug/kg. Ground water cleanup goals are based on SDWA MCLs. Chemical-specific ground water cleanup goals include acetone 1,120 ug/l; aldrin 0.00317 ug/l; alpha-BHC 0.00855 ug/l; beryllium 4 ug/l; bis(2-ethylhexyl)phthalate 6 ug/l; carbon disulfide 47.6 ug/l; chloroform 100 ug/l; chromium 50 ug/l; 4,4-DDT 0.158 ug/l; dieldrin 0.00337 ug/l; gamma-BHC 0.2 ug/l; methylene chloride 5 ug/l; nickel 100 ug/l; vanadium 78.1 ug/l; and vernolate 11.2 ug/l.
INSTITUTIONAL CONTROLS: Not applicable.
Remedy:
The Major components of the remedy are:
* Excavation of sludge, sediments, and contaminated soils.
* Off-site treatment/disposal of contaminated soils, sediments and sludge.
* Regrading and backfill of excavations using clean, compacted fill material.
* Temporary and possibly permanent relocation of residents with the potential demolition of selected apartment units.
* On-site treatment of contaminated groundwater in the surficial aquifer.
* Monitoring and possible withdrawal and treatment of groundwater in the alluvial aquifer. Treated groundwater will be discharged to a Publicly Owned Treatment Works (POTW), or if unavailable, to a nearby surface water body.
This remedy is the only and final remedial action for the site. The function of this remedy is to reduce the risks associated with exposure to contaminated soils, sediments, and ground water.
The selected remedy will:
1. Prevent migration of contaminated groundwater.
2. Prevent human exposure to contaminated soils, sediments and sludge.
3. Permanently reduce the toxicity of the harmful constituents in all media.
4. Prevent migration of site contaminants via drainage pathways.