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J <br /> .. <br /> Working To Restore Nature <br /> 6.2.2 In-Situ Enhanced Bioremediation <br /> This remediation alternative involves the stimulation of microflora or bacteria to degrade <br /> ..j hydrocarbons. Stimulation of the microbes is achieved by introduction of nutrients and <br /> oxygen through existing wells or trenches. Groundwater is usually pumped and <br /> recirculated to control migration of the dissolved petroleum constituents and to distribute <br /> the oxygen and nutrients. This alternative is most effective in projects with shallow <br /> => groundwater in permeable soils with relatively volatile contaminants. <br /> 4- 6.2.3 Free Product Removal with Groundwater Extraction <br /> This remediation alternative would involve removal of floating free product using a <br /> manual or automated slimmer. If the free product layer is of adequate thickness an <br /> automated skimmer can be used to remove free product on a continuous basis. <br /> F 1 Groundwater extraction can be used to induce a cone of depression in the water table, <br /> which could increase the effectiveness of free product removal. Due to the low level <br /> of BTEX constituents in the dissolved phase, extracted groundwater could likely be <br /> � .i <br /> discharged, without pretreatment, to the City's sanitary sewer system. Recovered free <br /> 3 product would necessarily be disposed of under hazardous waste manifest. <br /> 7.0 REFERENCES <br /> O California Department of Water Resources, 1981, Water Well Standards: State_of <br /> California, Bulletin 74-81, 92 pg. <br /> =; o State of California, Regional Water Quality Control Board, Central Valley Region, TJ- <br /> Regional Board Staff Recommendations for Prelimina1y Investigation and Evaluation o <br /> .= Underground Tank Sites, revised March 9, 1992. <br /> 0 United States Department of the Interior, Geological Survey, Stockton West 7.5' <br /> Quadrangle, 1987. <br /> f REPORTS/PAR1093.FNL 10 <br /> Irl <br />