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December 27, 1995 Page 6 accommodate new construction Electric power will be brought to the equipment compound on a temporary basis Equipment to be specified will mclude an atmospheric discharge abatement unit, an SVE vacuum pump,\valves, pressure gauges, air compres- sor, flow measuring devices, and a systems control panel Permitting Once the design is complete, permits will be obtained from the local building department (planning department review may be necessary), the local fire department, and the San Joaquin Valley Air Pollution Control District (SJVAPCD) With respect to SJVAPCD, an Authority to Construct and Permit to Operate are necessary for the proposed atmospheric discharge of treated soil vapor An SJVAPCD permit application package has been completed and is included as Attachment A Construction With the acquisition of the necessary permits, construction will begin The equipment procurement process will be initiated before construction begins so that equipment delivery will occur immediately before or during the construction phase Additionally, a health and safety plan will be prepared for use during construction Construction will include installation of Wells VW-1, VW-2, VW-3, S-1, and S-2, installation of aboveground transport piping, well head connections, vault box and equipment compound installation, and equipment placement and connection System Start-Up and Operation System start-up will consist of initial system optimization and completion of a source test as required by the SJVAPCD Once start-ups is complete, initial system operation will proceed with an emphasis on effective bulk hydrocarbon mass removal through volatilization At some point during system operation, the emphasis will shift from volatilization to biodegradation The shift in operational modes will be initiated based on an analysis of the hydrocarbon concentration decay trend for extracted soil vapor, and on the relative composition of the extracted vapor-phase hydrocarbons (molecular weight shift to heavier compounds) Additionally, data obtained from periodic bioassessments will be considered Based on experience gained from remediation at similar sites, it is anticipated that the volatilization mode of operation will extend for approximately 6 months Operational Data Collection and Performance Reporting A monthly operation and maintenance program will be implemented, and performance reports will be issued on a quarterly basis Data collection will be conducted to monitor system performance with respect to remedial objective,achievement and regulatory 3201333MWRi.PLN3 s r