ARCHIVED REPORTS XR0009921 - Laserfiche WebLink

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Corrective Action Plan Page 22 g Ethyl Benzene 01 04 The Mean Maximum Concentrations listed in the table, together with the proposed normative groundwater extraction rate of 30 gpm, were used to size the treatment system process units and estimate the rate of consumption of process materials under the expected maximum loading conditions The Peak Temporal Concentrations were referenced as a conservative check to ensure that the system will be capable of processing any foreseeable contaminant loading, ' regardless of the extremely low probability that such a loading would actually occur, without any risk that contaminant concentrations in the water discharged from the system would exceed the linuts set by the CRWQCB The design and operation of the groundwater treatment system is described below ' Groundwater Treatment System Recovered groundwater will be treated by air stripping and carbon adsorption before it is ' discharged to the municipal storm-water sewer under control of NPDES Permit No CA0082929 The proposed groundwater treatment system is designed to operate at influent flow rates up to a nominal maximum of 30 gpm which will occur when water is being pumped from all three recovery wells at the normative rate of 10 gpm To provide operating flexibility and as a safeguard against overload, each unit process in the system is designed for a limiting hydraulic throughput of at least 45 gpm The treatment system will be located in an enclosure constructed adjacent to the existing building on the site This enclosure 1s shown on Figure 6 Its construction will require demolition of part of the existing fence that encloses the yard to the rear and on one side of the flower shop and removal of a small tree growing there ' The general arrangement of equipment within the groundwater treatment enclosure is shown on Figure 10 A schematic process and instrumentation diagram for the system is presented on Figure 11 and the types, sizes and capacities of the principal components of the system are listed on Figure 12 (Note The arrangement and design implementation shown are preliminary The final layout, plumbing arrangement, power distribution array and instrumentation and control systems will be determined by a detailed design study ' which will be completed after specific equipment modules have been selected by manufacturer and model type) Equipment within the treatment enclosure will be set on a reinforced concrete slab with a 6 in high curb around the perimeter The enclosure will be surrounded by a vertical-board fence that will match the existing fencing that encloses the flower-shop yard This fence