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FACT SHEET ORDER NO. R5-2002- 38- CITY OF STOCKTON REGIONAL WASTEWATER CONTROL FACILITY SAN JOAQUIN COUNTY LATE REVISIONS To track the Discharger's compliance with the interim mass limitation, the Discharger is required to calculate a 12-month consecutive running average of the mass loading for mercury and Group A pesticides. Starting on the 12`h month after adoption of this permit, and for every month thereafter, the total mass pollutant loading for the previous twelve months will be reported in the monthly discharge monitoring reports and compared against the interim mass limitations calculated in the previous section. For mercury, provided the terms of the compliance schedule are being met, any mass loading over and above the interim mass limitation (divided by 12 to approximate the monthly mass contribution, as described in Effluent Limitation B.11) will be banked as a debit against a net total of mass discharges over the interim limitation. Likewise, any trailing 12-month mass loading under the interim mass limitation, also divided by 12, will be banked as a credit to the net total. The cumulative net total will be maintained until the Regional Board adopts a discharge specific offset program in the permit. In addition to these numeric interim mass-based limitations for mercury and the identified Group A pesticides, this Order includes additional interim requirements as follows. See Provisions G.6 through G.8 for the schedule of deliverables. • Preparation of a pollutant prevention plan in compliance with CWC 13263.3(d)(3); • Continued contribution of resources and sampling data to the respective TMDL processes; • Performance of an engineering study examining the feasibility, costs and benefits of treatment to remove pollutants from the discharge and/or reclamation/recycling projects that may also reduce loading; and • For mercury, performance of a study to identify other sources of mercury within the watershed available for offset reduction and estimate the costs and potential reductions in receiving water loading associated with total or partial removal of these sources. Based on this information an offset program proposal will be developed by the Discharger for consideration by the Regional Board. 11.5.4 Offset Program—Mercury Bioaccumulative Priority Pollutant It is recognized that the SIP recommendation to consider interim limitations at"representative, current levels" could effectively place a cap on future growth of the RWCF service area. Therefore, one of the interim requirements, above, requires the development of an offset program, which could be used to offset mercury loads over and above the interim limitation. If a TMDL is established and the discharge mass load still exceeds that limitation, this program could be used to offset discharges over and above the TMDL. _ treatment of wastewate_ , w r eiia of pipe In this conte:._ ' term offset refers to reductions in loading:. -,f the pollutant to L, ca and SJR watershed achieved through the Discharger's actions from an appropriate source. This includes appropriate reductions within the Sacramento River watershed. Offsets do not include