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FACT SHEET ORDER NO. R5-2002- -33- CITY OF STOCKTON REGIONAL WASTEWATER CONTROL FACILITY SAN JOAQUIN COUNTY LATE REVISIONS will�.e..e,...:..,,,1 perfefmerf it b �i b , trigger eaneentfatiens to preduee similaf repefts is een..:.I....e a dti_l.__.__ n of included equ nt oft The interim limitations base ' _ his r a'F d T , Fapee-app=eaeb,are summarized in Table 11-3 below and appear in Effluent Limitation B.6. Table 11-3 Interim Effluent Limitations for Inorganic Priority Pollutants Description Copper Cyanide (Ag/1) ( 1) Max. Concentration 12 8.0 Coefficient of Variation 0.6 0.6 Number of Samples 11 10 L:ne_f4aintyF e, rC99'm 4722_9 4-.23_0 Max. Dail Limitation 1 47435 9:624 (1) Calculated ner USEPA TSD Section 3.3.2 The calculated final effluent limitations,presented on Table 11-2 will become effective 1 May 2006 corresponding to the same date as Title 22 filtration/disinfection requirements. The maximum daily limitations cited in the above Table 11-3 will be the enforceable interim limitations until that time. Interim reporting requirements, as discussed in Provisions G.6 and G.7, are as follows: • Preparation of a pollutant prevention and minimization program in compliance with CWC 13263.3(d)(3); and • Performance of an engineering treatment feasibility study examining the feasibility, costs and benefits of treatment to remove pollutants from the discharge. As required by Section 2.1 of the SIP, in no case shall the compliance schedule exceed five years from the date of the permit issuance, reissuance, or modification. If the Discharger presents additional information that indicates alternative limitations should be allowed, the permit may be reopened and alternative limitations and time schedule necessary to comply will be considered. The maximum time schedule allowed for non-TMDL CTR priority pollutants to come into compliance is 5 years from the issuance of the permit. 11.3.5 Additional Monitoring of Inorganic Pollutants Barium has a Basin Plan objective of 100 µg/l within the Delta; however, it was not monitored in the effluent or receiving waters. Molybdenum has an agricultural goal of 10 µg/l. Molybdenum was monitored in the effluent but was not monitored in receiving waters. Molybdenum was detected in the effluent many times less than the goal and once above the goal at 11 µg/l. Hexavalent chromium is an inorganic metal that is a human carcinogen and has a public health goal of 0.2 µg/1. Hexavalent chromium was not analyzed in the effluent or the receiving waters. Because of the uncertainty associated with the lack of monitoring, additional studies of these constituents are warranted to more thoroughly evaluate reasonable potential of these constituents to exceed criteria. MRP No. R5-2002-_specifies monitoring