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process and reduce the possibility of shock loadings. From the equalization basin, waste water will be pumped to the activated sludge system. The activated sludge system will consist of an aeration basin and clarifier. Waste sludge will be aerobically digested and dewatered in sludge drying beds prior to final disposal. Sludge disposal must be ap- proved by the CVRWQCB. From the activated sludge process, waste water will be chemically treated with polymers, then chlorinated and filtered through a sand filtration unit. The filtered effluent will be commingled with the extracted polluted groundwater in a clearwell prior to being fed into the deep injection well. 3 . TDS LEVELS OF FORMATION FLUID A TDS value for the formation water from the Domengine For- mation at the proposed well site is not available at this time. Some TDS values for the Domengine Formation from oil field data range from approximately 18, 000 ppm to 24,000 Ppm- No known water supply wells have been completed to depths greater than about 810 feet in the general area of the well site. The vast majority of the recorded domestic water wells are less than 500 feet deep. 4 . NATURE OF INJECTION FLUID The injection fluid is made up of three combined waste streams: 1) process waste water, 2) miscellaneous brines (also process waste water) , and 3) recovered ground water. The Report of Waste Discharge (RWD) submitted to the CVRWQCB described the characteristics of each of these waste streams. The injection fluid is described as fol- lows: Constituents Process * * Ground Final Inj . Wastewater Brines Water Fluid ------------ ---------- -------- ------- ---------- Flow(gpd) 107,000 1,000 144, 000 252, 000 TDS(ppm) 2, 132 135,000 2,530 2, 604 EC(umhos/cm) 2,978 178, 000 3,760 3,526 Chloride(ppm) 650 84, 150 1, 020 995 BOD(ppm) 820 10,230 - < 5 SS 379 525 - < 5 EC-Electrical Conductance; BOD-Biochemical Oxygen Demand SS-Suspended Solids *Characteristics before pretreatment 5