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Pilot Testing Report and Conceptual Corrective Action Pian July 15, 1994 Manna Pro, 4004 South EI Dorado, Stockton, CA 27 ' Under these assumptions, the groundwater remediation system will remove approximately 1 5 pore volumes per year ' The groundwater pumping wells will be plumbed into a manifold and fed into the groundwater ' treatment system Regulators and flow meters will be used to regulate groundwater pumping rates for each well The regulator and flow meters may be located inside a treatment compound or in a manhole at the extraction wells Consideration for these design details will be addressed in the final ' system design The final system design will also include the control logic for the entire system to shutdown in case of power or equipment failure The information presented above is intended to provide information regarding the thought process ' used for the conceptual design and specification of some of the major equipment items to be used for remediation of sods and groundwater It does not contain all the information used for every item ' which may be required at the site The equipment or specifications presented should be modified as necessary during the final design to comply with National Electric Code (NEC) standards and all applicable federal, state and local regulations 633 Vapor Treatment ' The initial hydrocarbon removal rate has been measured at concentrations up to 280,000 it g/I during the pilot testing Because of the initially high hydrocarbon removal rate, vapor treatment of air emissions will probably be required prior to discharge Vapor treatment systems are generally recommended dependant upon mass loading rates and corresponding treatment costs Typical ' values used by Groundwater Technology are presented below Hydrocarbon Concentration Vapor Treatment 1 Less than 250 jug/I Activated Carbon 250 y g/1 to 12,000 p g/I Catalytic Oxidation Greater than 12,000µg/I Thermal Oxidation Activated carbon is utilized at low hydrocarbon concentrations because of its simplicity and ' economy However, at higher hydrocarbon concentrations (>250 micrograms per liter Lag/1]) activated carbon becomes costly because of carbon usage and regeneration costs Catalytic ' oxidation is typically used for hydrocarbon concentrations between 250 u g/I and 12,000 Ag/I Catalytic oxidation also allows flexibility if hydrocarbon concentrations fluctuate 281OR034 070 GROUNDWATER TECHNOLOGY, INC