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MONITORING AND REPORTING PROGRAM NO. R5-2004-0028 3 NPDES NO. CA0081558 CITY OF MANTECA, CITY OF LATHROP AND DUTRA FARMS WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUINCOUNTY Sampling Constituents Units Type of Sample Freauency Carbofuran ug/1 Grab Quarterly Standard Minerals" mg/l Grab Annually Priority Pollutants 8,12 mg/1 Grab Annually 1 Effluent temperature monitoring will be at the outfall location. 2 Chlorine residual must be monitored with a method sensitive to and accurate at the permitted level of 0.01 mg/l. 3 Concurrent with biotoxicity monitoring. 4 Report as total. 5 The acute bioassays samples shall be analyzed using EPA-821-R-02-012, Fifth Edition, or later amendment with Regional Board staff approval. Temperature and pH shall be recorded at the time of bioassay sample collection. Test species shall be fathead minnows (Pimephales promelas), with no pH adjustment unless approved by the Executive Officer. 6 Concurrent with Ammonia Sampling. 7 The bioassay may be modified to eliminate ammonia-related toxicity until 31 March 2004, at which time the Discharger shall be required to implement the test without modifications to eliminate ammonia toxicity. 8 Detection limits will be equal to or less than the lowest minimum level published in Appendix 4 of the Policy for Implementation of Toxics Standards for Inland Surface Waters, Enclosed Bays, and Estuaries of California (known as the State Implementation Plan or SIP). 9 Utilize Method 1631 with a detection limit of 0.0005 ug/l. 10 Trihalomethanes include bromoform, chloroform, bromodichloromethane, and dibromochloromethane. 11 Standard minerals shall include all major cations and anions and include a verification that the analysis is complete (i.e., cation/anion balance). 12 Concurrent with receiving water sampling. If the discharge is intermittent rather than continuous,then on the first day of each such intermittent discharge, the Discharger shall monitor and record data for all of the constituents listed above, after which the frequencies of analysis given in the schedule shall apply for the duration of each such intermittent discharge. In no event shall the Discharger be required to monitor and record data more often than twice the frequencies listed in the schedule. EFFLUENT MONITORING OF RECLAMATION WATER Effluent samples shall be collected downstream from the last connection through which reclaimed water can be admitted into the field distribution system. Effluent samples should be representative of the volume and nature of the discharge. Samples collected from the outlet structure of ponds will be