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' Vacuum Extraction System Vorkplan October, 1992 Firestone Store, 480, U. E1 Dorado, Stockton, CA Page 7 of 8 ' information on the unit as included in Attachment H. IPermittin Permits will be required by the following agencies: San Joaquin ' County Public Health Services, San Joaquin County Air Pollution Control District, and the City of Stockton Building Department , VES Operation It is proposed to operate the VES system for at least one month to accomplish the following YES remediation tests. Initially, one ' well located within the former tank excavation will be designated as the vapor extraction well. Vacuum will be applied to the well and vacuum pressure measured at each of the five remaining wells. While the vacuum is applied to the well, the air flow rate, system vacuum, and the system temperature will be recorded at the site. Additionally, initial air samples will be taken from the inlet and discharge of the vapor extraction unit. Other potential configurations of the system will be to open one or more of the inlet wells to atmosphere. Since the entire area is covered by concrete, opening the wells to atmosphere will allow for the passive infection of air within the tank excavation area. This induced air flow will theoretically allow more air flow through the vacuum system, thereby, enhancing the volatile hydrocarbon stripping ability of the system. The movement of outside air within the tank excavation will provide additional oxygen to the soil matrix and enhance any naturally occurring biodegradation of the hydrocarbons. As the system operation is fine tuned, it is expected that the vapor concentrations at the inlet of the vapor extraction system will decrease over time. When this occurs, the system will be stopped for several days and then restarted. The purpose will be to measure the initial hydrocarbon concentration after restart to determine the affect of pulsing the vapor extraction system. Past experience has indicated that the pulsing of the vacuum system can enhance remediation. During the testing period, the air inlet wells will be tested as vapor extraction wells. When a well is designated as a vapor extraction well, the vacuum impact on the remaining wells will be measured and recorded to determine the change in vapor vacuum and zone of influence. During the operation of the air inlet wells as Ryan Murphy Incorporated 'The Good Faith Company"