SITE INFORMATION AND CORRESPONDENCE 1980-1999

Home Browse Search

FACT SHEET, ATTACHMENT C • -4- WASTE DISCHARGE REQUIREMENTS ORDER NO. 2000-**** CITY OF LODI WHITE SLOUGH WATER POLLUTION CONTROL PLANT SAN JOAQUIN COUNTY bacteria does not exceed an MPN of 23 per 100 ml in more that one sample in any 30 day period. No single sample should exceed an MPN of 240 per 100 ml for total coliform bacteria. - In accordance with the recommendations of the DHS, this permit contains a time schedule to require a higher level of treatment for disinfection. The Board has considered the factors specified in Water Code Section 13263, including considering the provisions of Water Code Section 13241, in adopting the coliform limitation in the proposed waste discharge requirements. Presently there is no cost information provided by the Discharger regarding the costs associated with the increased treatment required to meet the proposed limitation. e) Ammonia Due to concerns discussed above over impacts of expanding the discharge on dissolved oxygen, the treatment plant flows have been held to a maximum of 7.0 mgd, whereas it was designed to treat up to 8.5 mgd of secondary-treated effluent. Actual flows have not exceeded 6 mgd. While operating at less than the design capacity, the plant has been effective at removing ammonia by nitrification. At this time there are no effluent limitations for ammonia. If flows increase such that the plant is no longer capable of removing ammonia, then ammonia may be discharged at a concentration that may cause or have the reasonable potential to cause, or contribute to toxicity in the receiving water. If monitoring shows there is a reasonable potential for ammonia concentrations to increase, then this Order may be reopened to include effluent limitations for ammonia. f) Temperature The SWRCB Water Quality Control Plan for Control of Temperatures in Coastal and Interstate Waters and Enclosed Bays and Estuaries of California(Thermal Plan) is applicable to this discharge. For purposes of the Thermal Plan, the discharge is considered to be an existing discharge of elevated temperature waste to an estuary. The Thermal Plan requires that such a discharge: A. Shall not exceed the receiving water temperature by more than 20°F; B. Shall not create a zone, defined by water temperatures of more than 1°F above natural receiving water temperature which exceeds 25 percent of the cross sectional area of a main river channel at any point; and C. Shall not cause a temperature rise greater than 4°F above the natural temperature of the receiving waters at any time or place. This permit includes the temperature limits as well as a Provision for the Discharger to evaluate its ability to comply.