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TENTATIVE TIME SCHEDULE ORDER R5-2018-XXXX 6 OAKWOOD LAKE WATER DISTRICT WASTEWATER TREATMENT FACILITY SAN JOAQUIN COUNTY Submit Facilities Improvement Completion Report certifying that Jan. 2022 upgraded treatment plant and disposal system is in operation.2 Compliance with Final Effluent Limits or Elimination of WWrF Jan. 2023 Discharges OLWD did not specify the exact dates for completion (only months). It is therefore presumed that completion will occur on or before the last day of the given month. 2, For the purposes of the TSO, these documents are considered "technical report." 3. These documents are not considered "technical reports" under this TSO. 4, In the event that OLWD is unable to execute a final written agreement by 29 March 2019, OLWD shall become responsible for submitting a Facilities Improvement Plan per Option B. PROPOSED EFFLUENT LIMITATIONS 15. Interim effluent limits were developed and proposed by OLWD using effluent monitoring data collected as part of the required Monitoring and Reporting Program. OLWD utilized EPA guidance, which suggests acceptable compliance rates of no more than one exceedance in three years. To calculate a Daily Maximum limit, OLWD applied a statistical probability based on a daily monitoring frequency. 16. Central Valley Water Board staff reviewed the proposed effluent limits submitted by OLWD and determined that they are appropriate on an interim basis until OLWD can redirect the discharge or improve treatment to comply with the limits in the existing WDRs. This short-term change in effluent limits would allow OLWD to continue pursuing connections to the City or construction of a new facility while minimizing effluent limit violations. Proposed interim limits for BOD, total nitrogen, TDS, total coliforms, and turbidity are as follows: Proposed Interim Effluent Limits Constituent Units Daily Maximum Limit Monthly Average Limit BOD mg/L 126 120 TSS mg/L 56 54 Total Nitrogen mg/L 38 38 TDS mg/L 869 868 Total Coliform MPN/100ml- 1,600 1,600 Turbidity NTU 20 20 17. A monthly average total coliform effluent limit is acceptable provided that where spray fields are used, wastewater is only discharged into an area prohibited from public access. The interim limit shall be set to minimize the number of exceedances while still providing a method to monitor compliance should monthly average concentrations increase. The spray field disposal area must be fenced and signage provided notifying the public of the access limitation.