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FACT SHEET ORDER NO. R5-2002-_ -32- <br /> CITY OF STOCKTON <br /> REGIONAL WASTEWATER CONTROL FACILITY <br /> SAN JOAQUIN COUNTY LATE REVISIONS <br /> 11.3.2 Evaluation of Calculated Inorganic Effluent Limitation and RWCF Compliance <br /> Historical effluent data indicates that RWCF may be able to meet the limitations for cyanide, <br /> but not the limitations for copper. Copper effluent concentrations exceeded the MDEL on one <br /> occasion, while the one detectable concentration of Cyanide (8 µg/1) exceeded the AMEL but <br /> not Lie MDEL, The elevated reporting limits for cyanide raises the uncertainty if this <br /> constituent would truly exceed the calculated effluent limitations on a monthly basis. More <br /> sensitive detection limits for cyanide must be used for compliance monitoring. <br /> Section 2.1 of the SIP allows for compliance schedules within the permit for existing <br /> discharges where it is demonstrated that it is infeasible for a Discharger to achieve immediate <br /> compliance with a CTR criterion. A schedule of compliance must include a series of required <br /> actions to be undertaken for the purpose of achieving a CTR criterion and/or effluent <br /> limitations based on a CTR criterion. These actions must demonstrate reasonable progress <br /> toward the attainment of a CTR criterion and/or effluent limitation. The compliance schedule <br /> must include a schedule for completion that reflects a realistic assessment of the shortest <br /> practicable time required to perform each task. The compliance schedule must contain a final <br /> compliance date based on the shortest practicable time required to achieve compliance. The <br /> deadlines to complete each action in the compliance schedule must be specified in the NPDES <br /> permit and must be accompanied by interim requirements. Specific compliance dates for <br /> completion of a Pollution Prevention Plan and Treatment Feasibility Study are included in <br /> Provisions G.6 and G.7, respectively. <br /> 11.3.4 Interim and Final Numeric Inorganic Effluent Limitations <br /> Based on SIP Section 2.2.2, interim effluent limitations are required when compliance <br /> schedules are granted to allow the Discharger an opportunity to provide additional information <br /> or construct facilities to meet the specified CTR criteria. These limitations must be based on <br /> current facility performance. In Ge oboe. 1995 h Publ.e Advisaf� <br /> T Ofee to th-P. s nye <br /> Plaii. The J <br /> C b <br /> eaneentmtian is o eded in the effluent when an investigation ipAe the eaUSe V rim e-fe)Eee'7alie <br /> weidd be <br /> b <br /> uneefaainty faeter is a different pp aeh than that ^rthe-US EPA TSD Section 3.3.2 guidance; <br /> whieb-recommends calculation of an estimated maximum concentration through a statistical <br /> application of the 99% confidence and 99% probability basis. Heweve. *he R n <br /> b� <br /> finds that applieatien of the T-81) apprea6h signifie&Btly evef estimates th- --wEinAuM- <br /> b eeeffieient ef vafiatieR predueed by a lifniteL4-aBd <br /> 5et: <br /> The <br /> Regional <br /> "s' <br /> . a3ar.u'-nicm�c'cnra3t '-t{6-�2-apr�l'_,1., 44e-fe -dttcfl i.. aF terra-pei:�.,._i,'r`u'xxcc— <br /> eCrl « liaiitatiansInterim '� - .1♦'„1. gthe <br /> kk3E2fi int•• The 1.2 eft.. nn. Faetor Yid _ <br />