Major Oil Companies Major Rental Car Companies California Department of Transportation City of Santa Barbara City of Los Angeles US Army Facility Electronics Manufacturer Major Oil Companies Former Service Station, Corona Del Mar, California Remediation of vadose zone soils (sands and silts) and groundwater. Site closed in May 1990 after 24 weeks of operations. Closure Agency: Orange County Health Care Agency and the Santa Ana Region of the Water Quality Control Board. Former Service Station, Temple City, California Remediation of vadose zone soils (fine-grained sands). Site closed in March 1991 after 19 weeks of operations. Closure Agency: Los Angeles County Department of Public Works. Former Service Station, Lompoc, California Remediation of vadose zone soils (sands, silts, clays) and groundwater. Site closed in June 1991 after 29 weeks of operation. Closure Agency: Santa Barbara County LUFT Program. Former Service Station: Sebastopol, California The Dual Vacuum Extraction System operated for 19 weeks and removed 9,800 pounds of petroleum hydrocarbons. Initial soil concentrations of 3,000 ppm with free product present. Concentrations decreased by 98.9%. 100% of the confirmatory soil samples were Non-Detect. Site closure pending from Regional Water Quality Control Board. Former Service Station: Los Angeles, California The Vacuum Extraction System operated for 18 weeks and removed 8,709 pounds of petroleum hydrocarbons. Initial soil concentrations of 2,440 ppm. Vapor stream concentrations decreased by 94.5%. 100% of confirmatory soil samples were Non-Detect. Site closure granted on December 2, 1991. Closure Agency: Regional Water Quality Control Board. Former Service Station, Los Angeles Excavated 2,000 cubic yard of soil; treated 600 cubic yards of contaminated soil through ex-situ treatment using carbon adsorption. Initial soil concentrations of up to 3,700 ppm. The cleanup goal was 10 ppm TPH. Levels Attained: All confirmatory sample 10 ppm, average concentration of 2.1 ppm TPH. The L.A. Regional Water Quality Control Board closed the site on October 22, 1991. Former service station, Berkeley, California. Soil and groundwater impacted with gasoline, free phase on the water surface. Soil permeability’s on the order of 10E-8 to 10E-9cm/sec. System included 24 dual extraction wells, 40 HP blower, and a 600 scfm thermal oxidizer. Approximately 10,000 pounds removed in 25 weeks. Pneumatic fracturing applied, but not effective at this site. BTEX below MCL's in groundwater. Conditional closure from the City of Berkeley and San Francisco Bay Region RWQCB. Former service station, San Francisco, California. Soil (sand and clay) impacted with hydrocarbons and free phase on the groundwater. 14 extraction wells removed 78,000 pounds of TPH in 47 weeks. "Interim" borings at 30 weeks showed 13,000 ppm remaining in sand soils. Enhancements included pneumatic fracturing and hot air injection. Enhancements removed an additional 20,000 pounds of hydrocarbons in 11 weeks. Confirmatory borings averaged less than 100 ppm soil. Performance based contract. The City of San Francisco forwarded closure request to the RWQCB. Major Rental Car Company Operating Rental Facility, Los Angeles, California Remediation of vadose zone soils (clays) and groundwater. Site closed in June 1991 after 28 weeks of operations. Closure Agency: Los Angeles Region of the Water Quality Control Board. City of Santa Barbara Former Drycleaner: Santa Barbara, California The Dual Vacuum Extraction System operated for 67 days and removed 1,200 pounds of petroleum hydrocarbons and PCE. Initial Soil concentrations of 16,600 ppb PCE; water concentrations of 200 ug/1 PCE. Concentrations decreased by 99.6% from 29 mg/1 to 0.1 mg/1 in vapor samples. 100% of the confirmatory soil samples were below 0.3 ppm PCE. Site closed-September 1991 by Santa Barbara County Department of Public Health and Central Coast Regional Water Quality Control Board. California Department of Transportation Former Service Stations and Automotive/Marine Shops (4 properties): Santa Barbara, California This ex-situ vacuum extraction system operated for 2 years treating 10 batches of soil. Initial soil concentrations ranged from 100 mg/kg to 3,000 mg/kg (ppm). Post treatment soils concentrations ranged from Non-detect to 90 mg/kg TPH. Benzene levels in soil were consistently treated to regulatory requirements of 0.07 ppm or Non-detect. More than 14,000 tons of soil were successfully treated and reused as construction backfill. All soil treated met cleanup goals. Average cleanup time: 30-45 days batch. Project regulated by California Department of Health Services (Alternative Technology Section), Regional Water Board and Santa Barbara County Health Department. City of Los Angeles Former Delivery Service The Vacuum Extraction System operated for 27 weeks and removed 22,797 pounds of petroleum hydrocarbons. Initial soil concentrations of 8,400 ppm. Vapor stream concentrations decreased by 92%. Site closure granted on December 30,1991. Closure Agency: Los Angeles City Fire Department. U.S. Army Facility Army Depot scheduled for closure in 1997, site on the NPL. Waste solvent tank leak of Freon 113, MEK, TCE, xylenes, and ethylbenzene. Shallow vadose zone impacted with up to 11,000 ppm. Extraction and treatment system operated for 24 weeks and removed 2,300 pounds VOC's. Confirmatory borings averaged less than 5 ppb MEK, TCE, and ethylbenzene; and 15 ppb xylenes. EPA solicited for closure in 1993. Electronics Manufacturer Manufacturing Facility, San Jose, California. Freon 113 impacted soil and groundwater. Soil concentrations up to 70 ppm in an area of approximately 25,000 cubic yards. On-site steam regenerated carbon used for vapor abatement. System removed 1,400 pounds of VOCs in 22 weeks. Confirmatory borings revealed no detectable Freon 113 in soil. Closure granted by the RWQCB in 1994.