Record of Decision System (RODS)
PORTLAND CEMENT (KILN DUST 2 & 3)
|Site Name:||PORTLAND CEMENT (KILN DUST 2 & 3)|
|Address:||1000 SO. REDWOOD ROAD|
|City & State:||SALT LAKE CITY UT 84116|
|NPL Status:||Currently on the Final NPL|
|ROD Type:||Record of Decision|
Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.
The Portland Cement Co. (Kiln Dust #2 & #3) site is located in Salt Lake City, Utah. The 70-acre site is a former dumping ground for cement kiln dust (CKD) and chromium-bearing kiln bricks, by-products of the cement manufacturing process. The area surrounding the site is relatively flat and is primarily industrial and borders low-density residential and vacant or agricultural land. There are currently no buildings on the site. A high capacity underground sanitary sewer pipe with above ground manholes traverses the site from north to south. A chain-link fence was constructed around the site in 1989 to prevent unauthorized entry.
Between 1965 and 1983, CKD and chromium-bearing bricks were deposited on the site resulting in soil, surface water, and ground water contamination. All waste CKD was the result of operations at the Portland Cement plant in Salt Lake City, which was owned and operated by Portland Cement Company of Utah (PCU) until September 1979, when Lone Star Industries (LSI) purchased the stock of PCU. The name of the company was then changed to Utah Portland Quarries, Inc. Although PCD and LSI placed the waste CKD on the site, neither company owns the land comprising the site.
In April 1984, LSI voluntarily began environmental investigations at the site that included installing groundwater monitoring wells to determine if groundwater contamination was present. In 1985, the investigation was organized and expanded as a remedial investigation/feasibility study under a Consent Decree issued by the State. The site was placed on the National Priorities List in June 1986.
Operable Units 1 and 2:
Operable Unit 1 (OU1) is defined as the "pure" CKD deposited on the site, and OU2 is defined as the chromium-bearing bricks and contaminated on-site soils. LSI completed a Phase II Remedial Investigation Report for OU1 and OU2 in 1989. EPA issued Records of Decision (RODs) for OU1 and OU2 in July 1990, and March 1992, respectively. The selected remedy for OU1 consisted of excavation and off-site disposal of the CKD, as well as separation and temporary onsite storage of the chromium-bearing bricks and ground water monitoring. The selected remedy for OU2 called for excavation of contaminated soil, treatment of contaminated soil and chromium-bearing bricks to enable land disposal, off-site disposal, and groundwater monitoring. In May 1992, OU1 and OU2 were merged into a single OU through a ROD Amendment for the purpose of implementing the selected remedies for both OUs concurrently. Among other things, the amendment also eliminated the soil treatment requirement of the original OU2 ROD. The remedies were completed in December 1997, resulting in the removal of nearly all CKD, contaminated soil, and chromium bearing bricks from the site.
OU3 consists of contaminated groundwater beneath the site. A Streamlined Human Health Risk Evaluation prepared in December 1995, concluded that the groundwater contamination poses an unacceptable risk to humans exposed to site groundwater. A ROD for OU3 was signed in August 1998.
Monitored Natural Attenuation is the selected remedy for operable unit 3 (OU3).
Institutional controls will prevent human exposure to site groundwater that would result in an excess cancer risk exceeding 1E-6. Site conditions are adequate to prevent off-site migration of contaminants to uncontaminated groundwater, and long-term monitoring will continue to ensure that no unacceptable off-site migration is occurring. Natural attenuation processes will restore the groundwater to its natural background state and maximize its potential as a drinking water source. Long-term monitoring will ensure natural attenuation is achieving the expected results. The implementation and enforcement of Alternate Concentration Limits (ACLs) at the groundwater discharge boundaries, as well as site conditions, will adequately protect surface water associated with the site.
Estimated Total Capital Costs (1997 $): $160,000
Estimated Total O&M Present Worth Costs (100 yr, i=7%): $470,000
Estimated Total Costs (1997 $; costs accurate to within -30 to +50%; no discount rate used): $630,000
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