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Artesian Environmental Consultants r• 1'agc. 3 The next phase of work for soil and groundwater clean-up is to evaluate and develop the clean-up alternatives (feasibility testing), develop the remediation plan, acquire proper permits, perform appropriate small-scale testing (if needed), and implement the remediation plan An important and initial part of this phase of work is to determine the soil and groundwater clean-up conditions and criteria that would be acceptable to San Joaquin County Public Health Sery ice/Env Lion mental Health Division to obtain site closure Once the closure conditions are defined, the iernediation plan can be developed to meet the clean-up criteria GROUNDWATER TREATMENT As a result of the presence of free product and dissolved -phase gasoline on the property, hydraulic control of the shallow gioundwater is necessary to prevent the continued migration of the contaminates downgradrent and the eventual capture of contaminated groundwater The majority of the groundwater plume control techniques presently require the extraction of the impacted groundwater Generally, this water needs to be treated to remove the hydrocarbons before it can be either ppdischarged to the sanitary sewer or transported off-site Some of the technologies include recovery wells to remove free product, recovery wells to remove groundwater containing dissolved product, iecovery bench, subsurface slurry wall barrier, and subsurface water injection bare rei Once the recovered water is on the surface, various treatment options exist, including an stripping, liquid phase carbon, advanced oxidation processes and bio -tanks In-situ groundwater treatment can be performed using the following technologies natural degradation, an spar ging (in-situ aeration), and augmented of accelet ated bioremediation 3175 Kerner Boulevard Suite E • San Rafael CA 94901 • (415) 257 4801 FAX (415) 257- 4805