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s 22 -current air flow against extracted water cascading through packing material, operate by forcing counter The packing maximizes air to water contact area,facilitating hydrocarbon volatilization. of the pump test,which will determine The final design of the air stripper will depend on the results the concentrations of hydrocarbons in the extracted groundwater. Because benzene will have the lowest ter, it is ed for allowable discharge concentration of the compounds dissolved in a design able o tdhaaobserved in MW 7(2,600 com purposes. The concentration of benzene is expected to be p in MW-2. In this case, ppb),but a worst case estimate is provided by the most impacted well,23,000 ppb ound area. The a 1-foot diameter,28-Soot high tower will be installed in the compp��ked height will be 23 feet,and the packing material will be 2.3-inches in diameter. A 1.5 hp fan will be used to provide the air to water ratio of 100,1 and an influent ndbxe I)enc air flow. Based on a 10 gpm flow rate, an concentration of 23 ppm,the removal efficiency fcr benzene will be greater than 9.% (App A permit will be obtained from the City of Manteca Department of Public Works to discharge treated water from the air stripper to the sewer system. The discharge limits will be determined by the a permit for focal groundwater recharge agency, if a permit cannot be obtained for sewer discharge,then will be obtained from the Regional Water Quality Control Board. 1 , The final design of the groundwater treatment system ~vitt be contingent on the groundwater , f these parameters extraction rates and concentration of hydrocarbons in the extractedof water. benzBot soower than 23,000 ppb, be determined during ! the aquifer test. if actual concentrate iameter of packing materia!) described then the air stripping tower specifications (i,e. tower height or d above may be modified. No design changes will be made that compromise the system's ability to meet the discharge criteria set forth by the Manteca Department of Public Works. Air stripping is a proven and r well understood treatment technology. 3,5.2 off Gas Controlaiver •-. The concentration of the off-gas from the Aair Polluuonstripper C ntrolgDistrict,enough basPd on thevresultsrof emission control from the San,loaquin County ' the aquifer test, emission control is required, then the vapor will be routed in line with the soft vapor extraction system for treatment in the catalytic oxidation unit. The decision to require control will be made based on dispersion modelling, local land use, and the degree of toxicity of the compounds emitted. The maximum capacity of the 20 kw catalytic oxidation unit is 30e0 ce gas Section streams can tae the air stripper off gas will act as the dilution air for the soil vapor. H accommodated with the proposed emission treatment device. TFOINOl-1 GY.INC.