SITE INFORMATION AND CORRESPONDENCE 1980-1999

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INFORMATION SHEET -2 CITY OF LODI WHITE SLOUGH WATER POLLUTION CONTROL PLANT SAN JOAQUIN COUNTY alleviate some of the impact of the pollutant load. The proposed effluent limits, including the summer and winter timeframes, were established due to limitations that the Discharger might not be able to meet more stringent limits. However, studies completed to date have not been conclusive that a discharge of 8.5 mgd at the effluent limits proposed will not cause water quality impacts, particularly to dissolved oxygen concentrations. Also, the existing acreage is expected to be marginally adequate to handle the increased reclamation flows. In order to resolve any water quality impact concerns over increasing the discharge rate, effluent flow discharges in excess of 7 mgd are prohibited pending completion of a study to evaluate and measure water quality impacts, the preparation of additional acres for reclamation, and Board staff approval . PUBLIC HEALTH Recreational uses of the receiving water in Bishop Cut and White Slough includes boating, fishing, and water contact sports of water skiing and swimming. Dilution studies conducted to date have been minimal , based on very limited information. The results indicated an average dilution ratio of receiving water to effluent of 10: 1 exists at the inlet to Dredger Cut, and higher dilutions occur in White Slough and Bishop Cut. The dilution study did not take into account irrigation pumping of Dredger Cut water or summer reclamation use of domestic effluent on City fields. Lodi does not have advanced treatment capability at this time, so treatment to a median coliform limit of 2.2 MPN/100 ml is not possible. The permit establishes a median coliform of 23/100 ml and requires the Discharger to post Dredger Cut as a wastewater disposal area. Further dilution studies are required. If dilution at the inlet to Dredger Cut or in Bishop Cut or White Slough is found to be significantly different from previous estimates, the permit can be reopened and modified to include more stringent effluent limits. RECLAMATION/SLUDGE MANAGEMENT The permit includes reclamation requirements for discharges of unchlorinated domestic effluent, industrial wastewater, and sludges generated at the treatment plant. The Discharger is required to complete an operational plan for reclamation and expand the acreage of land available for reclamation use. The Requirements include effluent monitoring of reclaimed water, sludge monitoring, ground water monitoring, and soil profile monitoring. Monitoring reports and annual land management reports are required to assure nutrient applications do not exceed crop requirements, and to adequately assess any ground water impacts from the applications. STORM WATER The permit specifies requirements for storm water runoff associated with industrial activity. Requirements are included to develop and implement a Storm Water Pollution Prevention Plan and to conduct monitoring of storm water discharges.