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Record of Decision System (RODS)

UTAH POWER & LIGHT/AMERICAN BARREL CO.

Abstract

Site Name:  UTAH POWER & LIGHT/AMERICAN BARREL CO.
Address:  600 W SOUTH TEMPLE 
City & State:  SALT LAKE CITY  UT  84104
County:  SALT LAKE
 
EPA ID:  UTD980667240
EPA Region:  08
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R08-93/073
ROD Date:  07/07/1993
Operable Unit(s):  01
 
Media:  Soil, GW
 
Contaminant:  VOCs, Other Organics, Metals
 
Abstract:  The 4-acre Utah Power & Light/American Barrel site is an inactive coal gasification and creosote pole treating plant located in Salt Lake City, Utah. Land use in the area is predominantly residential, with light industrial. A single aquifer, consisting of the shallow, unconfined and the deep, confined zones, exists beneath the site. The unconfined zone is not utilized as a drinking water source at the site; however, theconfined zone is utilized as a drinking water supply in some areas of the valley. The site is situated in the Jordan River Valley, surrounded by mountains, and near the Great Salt Lake. The study area for this site is divided into geographic areas consisting of the American Barrel Yard (ABY), the Denver and Rio Grande Western Railroad property or Southeast Area (SEA), the Union Pacific Railroad property or Northwest Area (NWA), the residential area, and the industrial area or Deseret Paint Site. From 1873 to 1908, coal gasification operations occurred onsite, which included coal storage sheds, a gas-o-meter (gas holder), tar wells, a coal tar still, the gas works, and the purifying house. The gas plant was located on the ABY, the SEA, and a portion of the NWA. The gas-o-meter was a buried tank used to store gas after production and before metering out to customers. In the early 1900s, this step was eliminated by switching to a scrubber technology. The coal gasification procedures produced by-products having commercial value, including coke, ammonia, tars and sludge, toluene, naphthalene, anthracene, and phenols. By-products having no commercial value included ash, clinkers, heavy tars, sludge, lime sludge, spent iron oxides, liquid wastes, and steam condensates, which were commonly disposed of onsite in pits and offsite in landfills. From 1909 to 1929, the site was utilized as a storage yard for equipment, wood power poles, and other items. From 1927 to 1958, creosote pole treating operations occurred, which included two pole dipping tanks:one underground, semi-open tank built on buried concrete walls, and one 400- gallon capacity steam heated tank made of welded or riveted iron walls that was used in conjuction with a boiler house and hot well tank to pressure treat poles in hot creosote before draining into six inches of sand. The specific chemical composition of the creosote used onsite is unknown.However, typical creosote compounds include PAHs, phenols, and nitrogen- sulfur-, and oxygen-heterocyclic components. From 1958 to 1987, American Barrel stored up to 50,000 55-gallon drums at any one time on virtually all portions of the ABY. It is assumed that the entire ABY was vulnerable to leaks and spills of the drum contents. In 1986, EPA conducted a site investigation that revealed stained soil- and productcontaining drums onsite. In 1987, Utah Power & Light (UP&L), the property owner, required American Barrel to remove all barrels and debris from the ABY as terms for their lease renewal. During the removal, barrel contents containing pesticides, solvents, resins, paints and paint removers, kerosene, gasoline, etc. leaked and spilled onto the ground. In 1987 and 1988, EPA collected soil and ground water samples which indicated soil contamination by PAHs, phenols, heavy metals, pesticides, nonaqueous phase liquids (NAPLs), styrene, and BTEX compounds; and ground water contamination primarily consisting of LNAPLs, BTEX compounds, and styrene. EPA concluded that contamination from historical operations and contaminant sources left onsite at the time of the abandonment have migrated into the soil and ground water. In 1988, EPA required UP&L to repair portions of the existing fence, install a new fence to completely surround the yard, and to cut down trees and vegetation in the ABY. This ROD addresses a final remedy for the contaminated soil and ground water in the ABY and SEA. The primary contaminants of concern affecting the soil and ground water are VOCs, including benzene, toluene, and xylenes; other organics, including PAHs, PCBs, pesticides, and phenols; and metals, including lead. SELECTED REMEDIAL ACTION: The selected remedial action for this site includes excavating approximately 5,660 yd[3] of principal threat soil in the tar berm area and the gas-o-meter contents, to the extent feasible as determined by EPA or until the concentrations of EPA target compound list PAHs are below 9,000 mg/kg; conducting leachability tests; segregating the contaminated soil onsite into RCRA hazardous and non-hazardous waste, and temporarily storing the waste onsite; excavating low-level threat surface and subsurface soil on the ABY and SEA to a depth of 10 feet and segregating them from principal threat RCRA hazardous waste onsite; recycling approximately 13,850 yd[3] of the low-level threat soil offsite into a cold mix asphalt product using solidification; incinerating the remaining RCRA hazardous soil offsite in a RCRA Permitted Subtitle C facility; segregating approximately 4,620 yd[3] of calcareous fill material uncovered or excavated during the soil removal action from other contaminated soil, with disposal of hazardous fill material offsite in a RCRA Subtitle C facility and non-hazardous fill offsite in a RCRA Subtitle D facility; backfilling the excavated areas with clean fill and regrading and placing a soil cover over them; installing an in-situ soil vapor extraction (SVE) system to remediate approximately 570 yd[3] of principal threat, LNAPL-contaminated soil in the ABY and SEA using ground water depression and vacuum blowers, with GAC treatment of recovered vapors produced from the SVE prior to discharging them to the atmosphere; extracting and treating ground water onsite using air stripping and/or GAC; discharging the treated ground water offsite to a POTW for further treatment; allowing the remaining ground water contaminant plume to naturally attenuate over 10 or more years; monitoring the ground water to evaluate the progress of natural attenuation; and implementing institutional controls, including deed and ground water use restrictions. The estimated present worth cost for this remedial action is $10,583,000, which includes an estimated total O&M cost of $2,836,000 for 30 years. PERFORMANCE STANDARDS OR GOALS: Chemical-specific soil cleanup goals are based on health -based exposure limits (ELs) and Federal and State ARARs, and include benzo(a)anthracene 47.7 mg/kg; benzo(b)fluoranthene 0.48 mg/kg; benzo(k)fluoranthene 47.7 mg/kg; benzo(a)pyrene 0.48 mg/kg; chrysene 47.7mg/kg; dibenzo(a,h)anthracene 0.48 mg/kg; dieldrin 0.36 mg/kg; indeno(1,2,3- cd)pyrene 47.7 mg/kg; and lead 500 mg/kg. Chemicalspecific ground water cleanup goals are based on SDWA MCLs, the NationalPrimary Drinking Water Regulation action level for lead, and health-based ELs, and include acenaphtylene 2,190 ug/l; antimony 5 ug/l; benzene 5 ug/l; cyanide 200 ug/l;1,2-DCA 5 ug/l; 2,4-dimethylphenol 730 ug/l; lead 15 ug/l; 2- methylnaphthalene 1,460 ug/l; 2-methylphenol 1,830 ug/l; 4methylphenol 1,830 ug/l; naphthalene 1,460 ug/l; phenol 21,900 ug/l; styrene 100 ug/l; toluene 1,000 ug/l; and xylenes 10,000 ug/l. INSTITUTIONAL CONTROLS: Deed and ground water use restrictions will be implemented to disclose the presence of contaminated soil and ground water onsite, further prohibit the drilling of any water wells, and prevent exposure to the ground water until remediation levels are achieved.
 
Remedy:  The objective of this Record of Decision (ROD) is to provide a remedy to address all contamination caused by previous site activities located on the American Barrel Yard and adjacent properties which affect surface soils, subsurface soils, and groundwater. Contamination from historical operations and contaminant sources left on-site at the time of abandonment have migrated into soil and groundwater. Remediation will be to the extent of contamination emanating from the American Barrel Yard and Denver Rio Grande and Western properties.

The response actions described in this ROD will permanently address all principal threats through treatment. Soil contamination will be reduced to health based levels for all contaminants of concern. These levels are based on a future industrial use of the site but will provide for future residential development with acceptable risks within EPA's risk range of 10[ -4] to 10[-6]. Groundwater remediation levels are based on the Safe Drinking Water Act maximum contaminant levels or acceptable risk levels for future residential exposure.

The major components of the selected remedy include:
* Excavation of soils which are principal threats based on visual observation, to the extent possible given physical limitations resulting from locations of existing railroad lines, or until the concentrations of EPA target compound list PAHs are below 9,000 mg/kg. The quantification of principal threats is based on EPA guidance, "A Guide to Principal Threat and Low Level Threat Wastes" which suggests defining principal threats as having a risk of 10[-3] or greater.
* Excavation of soils exceeding health based remediation levels, based on a 10[-6] worker exposure, that have a potential exposure pathway. Soils down to a depth of 10 feet are considered to have an exposure pathway.
* Treatment of excavated soils through offsite recycling of soils into a cold mix asphalt product suitable for paving roads. Incorporation of contaminated soils as a raw material into the asphalt product involves
treatment through solidification.
* If any RCRA characteristic hazardous wastes are encountered, these contaminated soils will be shipped offsite for incineration and will not be utilized in the asphalt treatment process.
* Soil vapor extraction (SVE) will be used to remediate principal threat light non-aqueous phase liquid (LNAPL) contamination. Location of the SVE extraction wells will be based on a principal threat definition where benzene in soils exceeds 10[-3] risk levels for residential exposure to groundwater. In conjunction with SVE, groundwater will be extracted from vapor extraction wells to enhance the SVE process. Off-gas from the SVE system will be treated prior to discharge to the atmosphere.
* Groundwater extracted from SVE wells, water pumped from excavations, and decontamination water will be treated to POTW discharge standards and then discharged to the Salt Lake City POTW for further treatment.
* The dissolved phase aqueous groundwater contamination plume is expected to naturally attenuate once the principal threat sources for groundwater contamination are remediated. If monitoring of groundwater contamination indicates that natural attenuation is not restoring groundwater to remediation levels, additional ource removal or more active groundwater remediation may be required.
 
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