Site Remediation

Lead and Arsenic Contaminated Soil Characterization, Excavation and Disposal, CRC
Under contract with the construction contractor, Commuter Rail Constructors, SAGE has completed the remediation of lead and arsenic contaminated soil at several sites within Utah Transit Authority’s (UTA) Provo to Salt Lake City FrontRunner commuter rail right-of-way. Soil at these sites contained up to 40,000 ppm lead (4% by weight) as well as elevated concentrations of arsenic, and required remediation before construction crews could begin work. The Murray Smelter Superfund site, described below, illustrates the scope of work at all of the sites.

SAGE prepared a work plan for the Murray Smelter Superfund site that was approved by Murray City, the Utah Division of Environmental Response and Remediation and EPA Region 8 to characterize the soil as it was excavated using X-Ray Fluorescence (XRF) with laboratory confirmation. SAGE tested, excavated and segregated the soil. Some material was stockpiled on site for future use as fill, while soil determined to be hazardous waste was transported to a RCRA-permitted hazardous waste landfill. Approximately 1,700 tons of soil was disposed of as hazardous waste. Confirmation sampling determined that lead concentrations met health and safety action levels.

Logan Lube Soil Remediation, Hardy Enterprises, Inc.
In the fall of 2006, SAGE self-performed the excavation of gasoline and diesel fuel contaminated soils at the former Logan #27 Food Mart, in Logan, Utah.  Approximately 720 tons of highly contaminated soil generated from this excavation was treated and disposed of at the Salt Lake Valley landfill, while over 220 tons of less contaminated soil was disposed of at the Logan municipal landfill.  During remediation activities, three previously unknown USTs were discovered and removed.  SAGE applied over 1000 pounds of Oxygen Release Compound (ORC) to supply a controlled release of oxygen to accelerate the naturally occurring aerobic contaminant biodegradation in ground water and saturated soils. All excavations were backfilled and site surfaces were restored to previous conditions.  Logan Lube (the occupant of the site) continued full operations with minimal impact throughout all remediation activities.

Site Investigation and Soil Remediation, Salt Lake City Mosquito Abatement District
SAGE was retained by the Salt Lake City Mosquito Abatement District to assist in negotiating a voluntary Consent Agreement with the Utah Division of Solid and Hazardous Waste.  The Consent Agreement required an assessment of the degree and extent of contamination, preparation of a Risk Assessment, and corrective action and/or site management. SAGE reviewed limited existing site data, prepared a Site Investigation Sampling Plan, and delineated organochlorine pesticides (including DDT, DDE, DDD) in both soil and ground water.  At the client’s request, soil remediation was initiated prior to the completion of the site investigation.  The high cost of incinerating pesticide contaminated soil required precise definition of soil targeted for removal, which was achieved through detailed surveying and the use of DDT field test kits and fast turn-around laboratory analysis. The remediation resulted in the excavation and off-site incineration of over 1,000 tons of soil characterized as hazardous waste.  Other soils contaminated with lower concentrations of pesticides were placed in non-hazardous waste landfills.  SAGE’s innovative waste characterization and management techniques resulted in more than a 90% reduction in soil disposal costs, saving over $10 million from original disposal estimates.

SVE System Remedial Design, Headquarters Sinclair
SAGE designed and installed a soil vapor extraction (SVE) system to treat both contaminated soil and ground water from a shallow perched aquifer at the Headquarters Sinclair site located in Castle Dale, Utah.  To streamline the remediation process, the SVE injection well installations were combined with a final phase of site investigation.  SVE well locations and screened intervals were selected based on a precise identification of the contaminated interval encountered in each boring during the site investigation.  Costs were reduced by modifying a previously-operated SVE/Air Sparging remediation system.  SAGE excavated 200 feet of trench, installed the system and prepared the Operations and Maintenance manual.