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Fuller Mobile home Park <br /> 365 E. Louise Ave-, Lathrop, California June 5, 1996 <br /> Phase III Site Remediation Feasibility Study Work Plan Page: 4 <br /> L3.3 Feasibility of Remediation Techniques <br /> 3.3.1 Pump and Treat <br /> Pump and Treat involves pumping groundwater from one or more wells <br /> and treating the water at the surface. This technology is not cost <br /> effective unless the soils can be demonstrated to have high permeability <br /> and Iow clay content. Hydrocarbons have a natural attraction to the <br /> electrical charge on clay particles and cannot be broken by removing the <br /> groundwater. Additionally, there is the danger of pulling the plume too <br /> fast and breaking it into two or more pieces. This could leave individual <br /> isolated contamination plumes that would be very difficult and costly to <br /> recover. <br /> L Data from the pump test will be necessary to determine the feasibility of <br /> pump and treat technology. <br /> 3.3.2 Bio-Vent With <br /> tinjectingi- sh <br /> This remediation technique involves air into the <br /> groundwater through perimeter wells while creating a vacuum on a <br /> centrally located withdrawal well. Analyses of withdrawn air will <br /> L demonstrate whether the system is effective. Oxygen in the fresh air is <br /> more polar than the clay particles and will carry the hydrocarbons to the <br /> withdrawal well. <br /> LAt the surface, the withdrawn air is more economical to treat than water <br /> from a pump and treat system. <br /> 3.3.3 Excavation Mth De-Watering <br /> No soil contamination was detected above the water table in any of the <br /> soil borings (Tables 1 & 3). The soil samples that did detect <br /> contamination at 10 feet were actually the brass sleeve at the bottom of <br /> the sampling spoon, the most undisturbed. This interval was 111/z to 12 <br /> feet, the bottom 6" interval of the two foot long spoon. The samples <br /> were labeled "10 feet" because the sampling interval started at 10 feet. <br /> It is apparent that all contamination is in the groundwater and is moving <br /> with the groundwater elevation changes. Excavation with de-watering <br /> is not a viable remediation technique. <br />