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Pacific Gas and Electric Company <br /> 202/799-5043 <br /> July 29 , 1988 <br /> FEASIBILITY OF IN SITU BIORECLAMATION <br /> The data collected from the site has been evaluated in <br /> comparison to other sites of similar hydrogeologic settings and <br /> petroleum compounds concentrations that have been successfully <br /> bioremediated in si1a by CTI . Tlii: comparison indicates that in <br /> situ bioremediation of the subsurface soils at the station is a <br /> feasible remedial action alternative. Soil hydrocarbon and <br /> triethylene glycol concentrations in the ranges found at the <br /> station can be readily degraded by an appropriate microbial <br /> population. It has been GTI ' s experience at other sites that <br /> this population may already be present in the native soils , but <br /> the population of these organisms would need to be increased and <br /> their growth sustained through the addition of tailored nutrien- <br /> ts. Prior to initiation of the bioremediation, a nutrient/micro- <br /> bial analysis would need to be performed. <br /> Soils above the water table surface, as logged during soil <br /> boring operations, consist primarily of silty sediments with <br /> varying degrees of sand and clay content . The aquifer material <br /> appears to be composed of loose, silty, fine sands . These <br /> subsurface conditions appear to have great potential for treat- <br /> ment by in situ bioremediation. <br /> 11 <br />