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~ent By: GC ENVIRONMENTAL RING; 714 632 9968; Dec.5.02 11 :38; Page 16 A site: characterization to assess the extent of soil contamination, which bad extended beneath the building, was conducted, as well as a pilot vapor extraction test. Using the results of the pilot test, :a full-scale vapor extraction system using activated carbon for air pollution control was designed and installed to clean the vadose zone. The site was turned over to the client after nine months of operation when a 99 percent reduction of contaminants in vadose zone was achieved. : . Site AsseSsment aDd RemediatIon Major Issues: SoirContamination Results: Site closed Los Angeles, CA Yollowing a Phase r Environmental Site Assessment which indicated the presence of a former UST beneath an office building, a subsurface investigation of soil and groundwater for hydrocarbon contamination was conducted at this site in Los Angeles. A site characterization to assess: the extent of soil contamination, which had extended beneath the building, was conducted, as well as a pilot vapor extraction test. Using the results of the pilot test, a full-scale vapor extraction syStem using activated carbon for air pollution control was designed and installed to clean the vadose zone. A site closure request was submitted to the RWQCB when approxiIIiately 350 pounds of volatile petroleum hydrocarbon compound was removed from the site. Sitec10sure was granted. Remedial nesie:n Prolects . Prellmillary Assessment and Groundwater Remedial Design Santa Fe Springs, CA Major Issues: Site Assessment and Groundwater Remediation Results: Groundwater remediation deemed complete when TeE and PCE concentrations were reduced to below MCL concentrations A preliminary site assessment was performed at one of The Lincoln Property Company's former hck maintenance facilities. The fonner underground storage tanks (USTs) had contained both unleaded gasoline and diesel during the time they were actively used for hazardoUs materiai storage. It was reported upon removal of the tanks, contaminated soils sunounqing the USTs were excavated and the excavation was closed. The assessment included soil borings and well installation. Up to six feet of product (diesel) was rep9rted in swell. A network of wells was installed SUtI'Ounding the tank excavation, delineating the extent of contamination and verifying the existence of regional polychlorinated solvent Contamination in the groundwater. A remediation system was designed consisting of an ORS probe scavenger dual pwnp system, a Gnmdfos single pump system, holding tanks, and granulated activated carbon filtration. Floating product was skimmed from the groundwater surface and pumped through double-walled pipes Into a SOC-gallon product-recovery tank. The product-recovery llink had a secondary containment vessel and was equipped with a high-level shutdo~n probe. When necessary, product was removed from the tank by vacuum truck and transported to a wlisto-oil reprocessor. The unit was in operation under NPDES permit from the Califoniia Regional Quality Control Board--Los Angeles Region. The system removed over 2,000 gallons of free.phase product. Over 4,000,000 gallons of petroleum hydrocarbon and polychlorinated solvent contaminated groundwater were treated using carbon filters. Groundwater 12 F:\OstlVcrIOPROPOSLlCity ors.... AnaI02P.12.(9) Envirooemnlal ScrvicesJ.doc