ARCHIVED REPORTS UIC PERMIT APP - Laserfiche WebLink

Home Browse Search

ATTACHMENT K:INJECTION PROCEDURES LEC-1 The LEC-1 well will operate at slightly higher rates than STIG-1 and will be permitted for an injection rate of 225 gpm. Injection pressures are planned to be similar to those measured at STIG-1. Other permit limitations for the new well have not been established. Injection Rates STIG-1 The currently designed and installed water balance system for the STIG plant (Figure K-2) demonstrates that the daily average injection rate is normally at or about 100 gpm. The range of daily average injection rates,when assuming plant full load operations under infrequent but anticipated conditions,may extend from zero to a maximum of approximately 183 gpm. On a short term(hourly)basis,the injection rates may range between the single injection well pump operation rate of 100 gpm and the maximum possible delivery rate of 200 gpm,with both injection well pumps in service. LEC-1 Circulating water system blowdown at the LEC plant will consist of the tertiary-treated makeup water from the WPCF and other recovered process wastewater streams from the LEC that have been concentrated by evaporative losses in the cooling tower, along with the chemicals added to the circulating water. The cooling tower concentrates these streams near the mineral solubility limit for the constituents of concern (calcium, silica,and TDS). This concentrated water must then be removed from the cooling tower via blowdown to prevent the formation of mineral scale in heat transfer equipment. The chemicals added to the circulating water control scaling and biofouling of the cooling tower and control corrosion of the circulating water piping and intercooler. Cooling tower blowdown rates will be controlled at approximately five cycles of concentration as a result of in-line water conductivity and constituency analyzers. Blowdown rates are expected to be between 125 and 225 gpm, depending upon cooling tower cycles of concentration. Two 150-gpm injection well pumps designed to draw suction from the cooling water tower basin sump will discharge through two 100-percent-flow prefilters and then into the injection well. Figures K-3a and K-3b show the planned water balance system for the LEC plant. The final plant design will be completed when the CEC is close to or has issued its permit for the LEC facility. LEC-1 injection rates will vary based on the number of cooling tower circulation cycles. Estimated injection flow rates for 5 cycles of circulation is 197 gpm. For 7 cycles of circulation,injection flow rates are expected to be 131 gpm. LEC-1 injection flow rates will not exceed the proposed permitted rate of 225 gpm. LEC-2 LEC-2 injection rates will be permitted to not exceed 225 gpm. The injection rates at which the well would operate would be determined by the well being backed up or supplemented. K-2 SAC/371322/082390003(ATTACHMENT-K.DOC)