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ORDER NO.R5-2003-0099 2 INFORMATION SHEET NEWPORT PACIFIC CAPITAL COMPANY ARBOR MOBILE HOME PARK WASTEWATER TREATMENT FACILTY SAN JOAQUIN COUNTY events that characterized the supply water and the treated wastewater. TDS concentrations of 350 mg/L and 380 mg/L were reported in the treated wastewater. Although there is no reliable groundwater quality information at this time, it is anticipated that continued discharge below the effluent limitation would be protective of the groundwater quality because some attenuation is anticipated in the unsaturated zone and a portion of the TDS may consist of biodegradable dissolved solids. Therefore, the discharge of wastewater with moderate increases of TDS in treated wastewater is acceptable Total Suspended Solids TSS was included as an effluent limitation because the site has historically discharged wastewater with elevated concentrations of TSS, which resulted in plugging the seepage pits. The reduced permeability of the seepage pits resulted in inadequate disposal capacity and spills of wastewater to the ground surface. By limiting the TSS concentration to the seepage pits, it is expected that disposal capacity can be maintained. The limit was set at 40 mg/L (monthly average) and 80 mg/L (daily maximum)because the Discharger demonstrated that effluent quality could be reliably achieved as reported in the RWD. It is anticipated that continued discharge below the effluent limitation would be protective of the seepage pit infiltration capacity. Biochemical Oxygen Demand BOD was included as an effluent limitation for the same reason as TSS. Discharge of excessive BOD will result in plugged seepage pits and inadequate capacity. The limit was set at 40 mg/L (monthly average) and 80 mg/L (daily maximum)because the Discharger demonstrated that effluent quality could be reliably achieved as reported in the RWD. It is anticipated that continued discharge below the effluent limitation would be protective of the seepage pit infiltration capacity. Antidegradation The antidegradation directives of Section 13000 of the California Water Code require that waters of the State that are better in quality than established water quality objectives be maintained"consistent with the maximum benefit to the people of the State." Waters can be of high quality for some constituents or beneficial uses and not others. Policies and procedures for complying with this directive are set forth in the Basin Plan(including by reference State Water Board Resolution No. 68- 16, "Statement of Policy With Respect to Maintaining High Quality Waters in California," or "Antidegradation"Policy). Resolution 68-16 is applied on a case-by-case, constituent-by-constituent basis in determining whether a certain degree of degradation can be justified. It is incumbent upon the Discharger to provide technical information for the Regional Board to evaluate that fully characterizes: ❑ All waste constituents to be discharged;