Item A-MWMC Facilities Plan - Laserfiche WebLink

Home Browse Search

MWMC FACILITIES PLAN TABLE 5.1.1-1 Existing NPDES Discharge Requirements and Limitations for the WPCF MWMC Facilities Plan, Eugene-Springfield CBOD5 and TSS Removal Shall not be less than 85% monthly average for CBOD5 and Efficiency 85% monthly for TSS. Total Residual Chlorine Shall not exceed a monthly average concentration of 0.05 mg/L or a daily average concentration of 0.12 mg/L Excess Thermal Loading: May Shall not exceed a weekly average of 3.1 billion BTUs per day I - Oct 31 (Summer) Ammonia: May I - Oct 31 Shall not exceed 22 mg/L daily (Summer) Maximum and 12 mg/L monthly average. (Not specified in permit, but should be expressed as Ammonia-N) (1) The permit also defines the mixing zone as follows: The allowable mixing zone is that portion of the Willamette River from 20 feet upstream of the diffuser to 200 feet downstream of the diffuser. In addition, the zone of immediate dilution (ZID) shall include that portion of the Willamette River within 50 feet downstream of the diffuser. (1) The permit also contains the following language regarding effluent limitations: This permit contains either technology or water quality based effluent limits for those parameters discharged by the permittee that the Department has determined require effluent limitations to comply with the water quality standards found in OAR 340-41-445 outside the above mixing zones. The limits were established on the basis of the information provided by the permittee and following the Department's rules, including OAR 340-41-026. Other parameters also were identified in the permittee's application for which the Department did not establish effluent limitations. The Department has determined that those parameters do not present a reasonable potential to violate applicable water quality standards. The permittee is required to notify the Department if changes occur in its processes or influent stream which could significantly change the effluent stream for any of those parameters. (2) Reclaimed wastewater outfal1101 and 102 No discharge to state waters is permitted. All reclaimed water reuse shall prevent: a. Prolonged ponding of trealed reclaimed water on the ground surface b. Surface runoff or subsurface drainage through drainage tile c. The creation of odors, fly and mosquito breeding, or other nuisance conditions d. The overloading of land with nutrients, organics, or other pollutant parameters e. Impairment of existing or reasonably probable beneficial uses of groundwater Outfal1101: Prior to rouse of the reclaimed water, it shall receive at least Level II treatment as defined in OAR 340-55 to: Reduce total coliform to 240 organisms per 100 mL in two consecutive samples, and a 7-day median of 23 organisms per 100 mL. Outfal1102: Prior to rouse of the reclaimed water, it shall receive at least Level III treatment as defined in OAR 340-55 to: Reduce total coliform to 7-day median of 2.2 organisms per 100 mL and maximum of 23 organisms per 100 mL. Irrigation shall conform to the irrigation management plan approved by the Department in accordance with OAR 340-55 for agricultural, commemial, or industrial use. (3) Emergency Overflow Ouffalls 002 through 014 ,5-2 MWMC_5.0_REV8_VKS.DOC