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REVISED MONITORING AND PORTING PROGRAM NO. 97-11 5 5 <br /> CITY OF MANTECA AND CITY OF LATHROP <br /> WASTEWATER QUALITY CONTROL FACILITY <br /> SAN JOAQUIN COUNTY <br /> Species: Pimephales promelas, Ceriodaphnia dubia, Selenastrum capricornutum <br /> Frequency: Once per quarter, four quarters per year <br /> The Discharger shall conduct quarterly chronic toxicity testing using 100 percent effluent and 2 controls. <br /> If toxicity is found in any of the 100 percent test, the Discharger must immediately retest using the full <br /> sampling protocol of 5 dilutions listed below. <br /> Dilution Series: <br /> Dilutions (%) Controls <br /> River Lab <br /> 100 33 11 3_6 1_2 Water Water <br /> % WWTP Effluent 100 33 11 3.6 1.2 0 0 <br /> %Dilution Water 0 67 89 96.4 98.8 100 0 <br /> % Lab Water 0 0 0 0 0 0 100 <br /> SLUDGE MONITORING <br /> A composite sample of sludge shall be collected annually in accordance with EPA's POTW Sludge <br /> Sampling and Analysis Guidance Document, August 1989, and tested for the following metals: <br /> Cadmium, Chromium, Copper, Lead,Nickel, and zinc <br /> Sampling records shall be retained for a minimum of five years. A log shall be kept of sludge quantities <br /> generated and of handling and disposal activities. The frequency of entries is discretionary; however, the <br /> log should be complete enough to serve as a basis for part of the annual report. <br /> SOIL PROFILE MONITORING <br /> A minimum of four representative locations shall be established for soil profile sampling of the fields <br /> where effluent and sludge are applied. The following shall constitute the monitoring program until <br /> modified in accordance with Provision 5: <br /> Measurement Units Soil Profile Frequency <br /> Nitrate Nitrogen mg/kg 4 feet' Annually, <br /> Kjeldahl Nitrogen mg/kg 4feet' Annually, <br /> Soluble Salts mg/kg 4 feet' Annually, <br /> Total Metals mg/kg 4 feet' Annually, <br />