SITE INFORMATION AND CORRESPONDENCE

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INFORMATION SHEET 9 CITY OF STOCKTON REGIONAL WATER QUALITY CONTROL PLANT SAN JOAQUIN COUNTY Receiving Water Monitoring The previous permit required receiving water monitoring to be conducted daily during the low flow season, and at two river depths at most stations. Since the river model has become available, the frequency of receiving water monitoring can be decreased. This Order requires the receiving water to be monitored weekly during the summer and fall, and monthly during the rest of the year. The time for weekly sampling corresponds to the period when dissolved oxygen excursions are most likely. Also, all samples are now collected only at mid-depth. Sludge Disposal The City has been contracting with a company to have sludge hauled off-site to a land application site. The contract is for the sludge which is currently being generated. The City also has stockpiles of sludge, both on-site and at the Port of Stockton, which need to be disposed. This Order requires the Discharger to submit a sludge disposal plan, in accordance with the Monitoring and Reporting Program, for the currently-generated sludge and the stockpiled sludge. Water Reclamation The Discharger previously was allowed to temporarily supply chlorinated secondary treated wastewater for specific reclamation purposes, including dust control and compaction by building contractors, street sweeping, and use in a local cement batch plant to mix cement, in accordance with Resolution 77-69 for Emergency Use of Reclaimed Water. This permit allows the reclamation uses to be continued on a permanent basis. Reclamation specifications are included to protect public health and receiving water beneficial uses. The Requirements include effluent monitoring of reclaimed water. A provision has been included to allow additional specific reclamation uses can be approved by the Executive Officer. Storm Water The permit specifies requirements for storm water runoff associated with industrial activity. Since all stormwater which falls on the treatment plant site is collected and pumped to the headworks of the plant, a Storm Water Pollution Prevention Plan has not been required in this permit. 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 time schedule, to correct any violations.