SITE INFORMATION AND CORRESPONDENCE 1980-1999

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INFORMATION SHEET CITY OF LODI -3- WHITE SLOUGH WATER POLLUTION CONTROL PLANT SAN JOAQUIN COUNTY PRETREATMENT The permit specifies pretreatment requirements in conformance with 40 CFR Part 403. Quarterly and annual reports are required to be submitted which detail the Discharger's pretreatment activities, its compliance status, and any modifications, including a timeschedule, to correct any violations. INLAND SURFACE WATERS PLAN/ENCLOSED BAYS AND ESTUARIES PLAN The permit addresses provisions of the ISWP and the EBEP. The Discharger is required to complete an Effluent and Receiving Water Quality Assessment. Based on the results, the Board may reopen and modify the Order. In addition, the Discharger is required to meet an effluent toxicity limitation of 10 TUB. Effluent toxicity testing, outlined in the Monitoring and Reporting Program, must be conducted in accordance with EPA guidelines. If the effluent consistently exceeds the chronic toxicity limit (three consecutive tests greater than 10 TUB) , the Discharger is required to investigate the problem, and take all reasonable steps to reduce or eliminate the toxicity. The calculation of the chronic toxicity effluent limitation of 10 TUB was based on a modification of equation 2(b) ,page 12 of the ISWP. The dilution ratio (D) was based on the dilution study performed by the Discharger, where D = (Qb+Qe)/Qe, a modification of the expression used in equation 2(b) . Based on the minimal information developed by the Discharger, D was measured to be 10 at location R2. Cb, the background level of toxicity, was assumed to be zero, and Co, the water quality objective, was 1 TU,. As stated previously, 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 the original estimate, the permit can be reopened and modified to include a more stringent effluent limit.