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George's Service Remedial Action Work Plan Project No.425.2 June 30,2011 approximately 2 gallons (14 lbs) of gasoline in the groundwater at the Site, post-vapor extraction and excavation activities. 4. SUMMARY OF REMOVAL ACTIONS On behalf of Teranishi Family, owners of the former George's Service, GTI performed a removal action designed to remove the highest concentrations of petroleum hydrocarbons in the soil at the site, which are generally in the upper 10 to 15 feet. The lateral extent of the heaviest soil contamination was estimated to cover an area approximately 30-feet by 40-feet in size. The excavation was performed in late July of 2001 and removed approximately 500 cubic yards of contaminated soil. Analytical data from soil samples collected from the stockpile and excavation sidewalls show that approximately 4,900 pounds of TPH-G were removed from the site. At the end of October 2001, the stockpiled soil was transported and disposed of at the Forward Landfill. Refer to Soil Excavation Report — George's Service, 1600 Derham Ferry Road, Tracy, California prepared by GTI, dated January 28, 2002. S. SUMMARY AND EVALUATION OF ALTERNATIVES Over the course of the soil and groundwater investigations conducted by GTI, several remedial alternatives have been evaluated for effective application to the George's Service site. 5.1. Excavation Excavation simply involves the removal of contaminated soil from the Site. Excavations can be effective at Sites that have heavy contamination in unsaturated zones that are situated in areas that are not spatially restricted, or that exhibit physical characteristics (low permeability) that render other remedial technologies, including in-situ, from being effective. Excavation was evaluated and found to be effective at the George's Service site. As previously discussed, in 2002 highly contaminated soil was removed from the core of the soil plume. Excavation is not a cost effective method of addressing the residual contamination at the site. 5.2. Pump and Treat Pump and treat remediation involves the pumping of contaminated groundwater from the subsurface and then treating the water to remove contaminants. Groundwater that has been treated can usually be discharged under permit to the local sanitary sewer system for treatment at a wastewater treatment plant. However, discharge requirements will likely limit the amount of discharge to the local sewer system, thereby limiting the amount of groundwater that can be extracted. Geological TecWes inc. 8 4252 RAP.docx