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7 <br /> 13M F m Y�ossemrte Avenue.Manteca.Sen Joaquin Cour" Caftffft <br /> • <br /> C. Cross sections indicating soil stratigraphy were included in the Aegis PAR <br /> dated November 12, 1991. The cross sections included results of <br /> laboratory analyses performed on soil samples collected during monitoring <br /> well installation (Attachment 3) <br /> d An estimate, with calculations, of the radius of influence of the proposed <br /> groundwater extraction well are included in Attachment 4 <br /> e A discussion of the expected effects of the groundwater extraction and <br /> treatment system on groundwater and the existing hydrocarbon plume are <br /> included in Section 5 4 of the Aegis PAR, and stated <br /> 5.4 Vapor/Groundwater Extraction and Treatment <br /> This remedial action alternative may address the remediation <br /> of both soil and groundwater with one remediation system <br /> The process would use a vacuum blower connected to one <br /> or more vapor extraction/monitoring weli(s) A vacuum pump <br /> on the extraction well(s) causes volatilization of hydrocarbons <br /> in the sod. A groundwater pump system will be connected to <br /> an on-site monitoring well and groundwater pumped out of <br /> the aquifer This process would create a cone of depression <br /> on the groundwater surface, ensuring containment of the <br /> hydrocarbon plume and to further expose sods containing <br /> petroleum hydrocarbons Hydrocarbons are volatilized from <br /> the groundwater by spray aeration The hydrocarbon vapors <br /> from the soil and the groundwater would be destroyed by <br /> appropriate off-gas treatment equipment Collection of <br /> additional groundwater and sod parameters would be <br /> necessary for the design and installation of an optimal system <br /> The subsurface components of a venting system were <br /> installed by a previous consultant and additional design <br /> features may be mandolded into the existing components. <br /> The time-frame for the soil cleanup and the restoration of the <br /> aquifer may take 1 to 3 years <br /> f The remediation system that has been selected, the RSI S.A.V.E System, <br /> is designed to automatically shut down in the event of system failure The <br /> system can not be started remotely, so the cause of the system shut down <br /> will be investigated when personnel are dispatched to restart the system. <br /> 90-09ON LTR -2- <br />