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D R A F T January 4, 2012 • secondary effluent discharged to the onsite ponds meet maximum daily and monthly average effluent limits for BOD and settleable solids.3 The groundwater limitations prohibit waste releases from any portion of the Facility, including the agricultural fields, from causing concentrations of fourteen waste constituents in groundwater to exceed specified limits or natural background quality, whichever is greater." Those constituents include total dissolved solids (TDS), boron, chloride, nitrogen, nitrates, and ammonia. The limitations, however, do not become effective until the City characterizes natural background groundwater quality, after at least two years of monitoring, in a technical report that must be submitted to the Central Valley Water Board by August 1, 2010.5 If the groundwater monitoring indicates that waste releases to groundwater have caused or threaten to cause increases.in background concentrations, the City must submit a workplan for a technical evaluation of each Facility component to determine best practicable treatment or control for each waste constituent of concern. Any necessary Facility modifications must be completed no later than four years after the Central Valley Water Board Executive Officer's determination that the technical evaluation is adequate, unless the Executive Officer approves a longer schedule. In addition to the groundwater study, Order No. R5-2007-0113 directs the City to conduct a study to characterize the wastewater influent collected by its industrial Iine.e The study's goal is to isolate and identify the primary, unique components of the industrial influent. Once a workplan is submitted and approved, the City must complete the study within two years after the study is commenced. C. Basin Plan The water quality control plan for the Sacramento and San Joaquin River Basins (Basin Plan)' provides the basis for many of the requirements in Order No. R5-2007-0113. The Basin Plan designates the beneficial uses for groundwater underlying the Facility, which include municipal and domestic supply, agricultural supply and stock watering, and industrial process water and service supply.8 Water quality objectives to protect the uses include narrative objectives for chemical constituents, taste and odors, and toxicity. In addition, groundwater 3 Order No. R5-2007-0113, Land Discharge Specifications IV.B.1 through B.5. 4 Id., Receiving Water Limitations,V.B.1.C. 5 Id., Provisions VI.C.2.d. 6 Id., Provisions VI.C.2.c: 7 Fourth Edition (1998). e Basin Plan at II-3.00. 4.