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TENTATIVE TIME SCHEDULE ORDER R5-2018-XXXX 3 OAKWOOD LAKE WATER DISTRICT WASTEWATER TREATMENT FACILITY SAN JOAQUIN COUNTY several sewer collection laterals needing repairs, but did not identify areas with high infiltration and inflow (1/1) issues. However, the source of 1/1 is suspected to be the privately-owned mobile home park. The mobile home park sewers are not maintained by OLWD despite their connection to the WWTF. OLWD will continue to investigate flows from the mobile home park, and if flows are significant or other 1/1 issues are identified, OLWD will require the mobile home park owner address those issues. In addition, Central Valley Water Board staff will continue ongoing discussions with OLWD to identify short-term and long- term actions to address noncompliance. B. Effluent concentrations for turbidity, total nitrogen, total coliform, total dissolved solids (TDS), and total suspended solids (TSS) have intermittently exceeded WDR requirements since 2012, and odor complaints have been documented. The number of exceedances has increased as flow rates have increased, with numerous exceedances occurring in recent years (2015-2017). 9. There was a total of 434 effluent limitation exceedances during 2017. For total Nitrogen, there were 34 exceedances of effluent daily maximum and monthly average limits (10 mg/L). For TSS, there were two months where the monthly average effluent limit (10 mg/L) was exceeded. For total coliform, there were 12 exceedances of the daily maximum limit (240 MPN/100mL); 29 exceedances of the seven-day median maximum limit (2.2 MPN/1QOmL), and 19 instances of more than 23 MPN/100 mL more than once per month. For turbidity, there were 113 exceedances of the daily maximum turbidity limit (10 NTU), 163 exceedances of the daily average turbidity limit of 2 NTU, and 62 exceedances of the 95-percentile turbidity limit of 5 NTU in 2017. PROPOSED ACTIONS AND IMPLEMENTATION SCHEDULE 10. On 11 April 2018, OLWD submitted a Compliance Plan to provide the proposed measures to address noncompliance with effluent limits and capacity issues related to WDR Order No. R5-2006-0114-002. The plan includes short-term and long-term corrective measures and proposes interim effluent limits that would allow continued operation of the WWTF until the OLWD either connects to the City of Manteca's wastewater treatment plant or upgrades its own WWTF. On 12 April 2018, OLWD submitted a letter to the State Water Resources Control Board Division of Drinking Water summarizing the proposed interim actions to be taken prior to redirecting the discharge to the City of Manteca or upgrading on-site wastewater treatment and disposal. 11. The proposed short-term corrective actions and schedule include: a. Identifying and implementing approaches to optimize the performance of the current sequential batch reactor (SBR). OLWD retained the services of an operations consulting engineer to work with operating staff to improve performance, and to assess the capacity of the treatment system. The consulting engineer recommended several improvements, including increased operation of sand filters and modification to improve aeration and mixing (both of which have been implemented).