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REVISED MONITORING AND REPORTING PROGRAM NO. 97-115 2 <br /> CITY OF MANTECA AND CITY OF LATHROP <br /> WASTEWATER QUALITY CONTROL FACILITY <br /> SAN JOAQUIN COUNTY <br /> Sampling <br /> Constituents Units Type of Sample Frequency <br /> Oil and Grease mg/l Grab Weekly <br /> Nitrate (as N) mg/l Grab Weekly <br /> Ammonia (as N) mg N/1 Grab Weekly <br /> Test procedures to follow the latest version of EPA/600/4-90/027F using fathead minnows <br /> (Pimephales Promelas) or golden shiners. <br /> The tests may be 96 hr. static non-renewal, 96 hr. static renewal, or flow through. <br /> Increases in pH may occur in test solutions during acute, static non-renewal toxicity of <br /> pollutants such as ammonia. This problem can be avoided by conducting a test in a static <br /> renewal or flow through mode rather than a static non-renewal mode. <br /> The test may use dilution water at a concentration of 2.8 parts river water and 1 part effluent. <br /> The river water shall be collected upstream and outside of the influence of the outfall. <br /> If receiving water dilution is determined to contain toxic constituents which affect the <br /> outcome of the bioassay analysis a standard dilution water having the approximate same <br /> characteristics (hardness and/or salinity) as the receiving water shall be used. Upon failure of <br /> the Test due to receiving water toxicity, an alternative test shall immediately be conducted. <br /> 2 Standard minerals include Total Dissolved Solids, Electrical Conductivity, Chlorine, Sulfate, <br /> Nitrate, Bicarbonate Alkalinity, Carbonate Alkalinity, Calcium, Magnesium,Potassium, <br /> So4ium, pH, and Hardness. <br /> If the discharge is intermittent rather than continuous, then on the first day of each such intern ittent <br /> discharge, the Discharger shall monitor and record data for all of the constituents listed above, after <br /> which the frequencies of analysis given in the schedule shall apply for the duration of each such <br /> intermittent discharge. In no event shall the Discharger be required to monitor and record data more <br /> often than twice the frequencies listed in the schedule. <br /> EFFLUENT MONITORING OF RECLAMATION WATER <br /> Effluent samples shall be collected downstream from the last connection through which reclaimed water <br /> and sludge can be admitted into the field distribution system. Effluent samples should be representative <br /> of the volume and nature of the discharge. Samples collected from the outlet structure of ponds will be <br /> considered adequately composited. Time of collection of a grab sample shall be recorded. The following <br /> shall constitute the effluent monitoring program: <br />