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EPA staff evaluated the subsurface geology of the <br /> proposed injection area by analyzing seismic data, well <br /> logs, well history reports, published maps, cross <br /> sections and reports. <br /> 2 . PRETREATMENT PRIOR TO INJECTION <br /> The wastewater generated by the cogeneration facility <br /> consists of: boiler feedwater treatment chemicals, <br /> cooling water treatment chemicals, and waste from <br /> demineralization. These three sources are combined and <br /> neutralized prior to injection. <br /> Wastewater from the Facility will be treated to remove <br /> solids from the waste stream. Solids removal will be <br /> accomplished by passing the waste stream through a system <br /> of multi-media and polishing filters. The multi-media <br /> and polishing filters will have redundant units installed <br /> to insure continuous operation in the event of equipment <br /> failure. Back flush from the filters will be collected <br /> in a sludge/surge tank. Under normal operating <br /> conditions, the total suspended solids (TSS) content of <br /> the wastewater at the injection point will be 10 ppm or <br /> less. If suspended solids content exceeds normal <br /> operating parameters, the wastewater will be recycled <br /> through the filtering equipment. The filtered wastewater <br /> will be stored in holding tanks prior to injection. The <br /> waste stream will be regularly sampled and analyzed for <br /> TSS at a point immediately preceding the injection well . <br /> Solids which will be collected in the sludge/surge tank <br /> will be tested for hazardous materials and disposed of <br /> according to State and Federal regulations. <br /> 3 . TDS LEVELS OF FORMATION FLUID <br /> A TDS value for the formation water from the Primary <br /> Injection Formation at the proposed well site is not <br /> available at this time. There is a possibility that the <br /> TDS values in this zone will be less than 10, 000 ppm <br /> making it a USDW. In the event that the Primary <br /> Injection Zone is unsuitable, the Alternate Injection <br /> Zone is expected to have salinities of approximately <br /> 25, 000 ppm. <br /> 4 . NATURE OF INJECTION FLUID <br /> The injection fluid consists of: boiler treatment <br /> chemicals, cooling tower treatment chemicals, and waste <br /> from demineralization. <br /> 6 <br />