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REVISED MONITORING REPORTING PROGRAM NO. 9P15 4 <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 /> River Flow cfs nearest gaging station Bi Weeklyl <br /> River Velocity feet/sec meter, Continuous <br /> Dissolved Oxygen mg/1 R-1 thru.R-4 Bi Weekly <br /> pH pH Units R-1 thru R-4 Bi Weekly <br /> Ammonia (as N) mg N/1 R-1 thru R-4 Bi Weekly <br /> Turbidity NTUs R-1, R-2 Bi Weekly <br /> Temperature OF R-1, R-2 Bi Weekly <br /> Chlorine Residual mg/l R-1, R-2 Bi Weekly <br /> Total Nitrogen mg/l R-1, R-2 Bi Weekly <br /> 1 Samples shall be collected every two weeks when of discharge to the receiving water is less <br /> than 6.9 mgd and shall be collected weekly when discharge flows exceed 6.9 mgd. <br /> 2 River velocity station will be established near the discharge point,with sufficient sensitivity <br /> to measure flows as low as 0.5 ft/sec and shall be fully operational by 1 June 2001. Interim <br /> river velocity monitoring will be conducted by field measurement in accordance with an <br /> approved work plan required by Provision 7 of revised Order No 97-115. River velocity <br /> monitoring is not necessary when river flow is above 3000 cfs (as measured at Vemalis) or <br /> river velocity is above 2.0 feet/sec. Report these values as above 3000 cfs or above 2.0 ft/sec. <br /> In conducting the receiving water sampling, a log shall be kept of the receiving water conditions <br /> throughout the reach bounded by Stations R-1 and R-2. Attention shall be given to the presence or <br /> absence of: <br /> a. Floating or suspended matter <br /> b. Discoloration <br /> c. Bottom deposits <br /> d. Aquatic life <br /> Notes on receiving water conditions shall be summarized in the monitoring report. <br /> THREE SPECIES CHRONIC TOXICITY MONITORING <br /> Chronic toxicity monitoring shall be conducted to determine whether the effluent is contributing toxicity <br /> to the River. The testing shall be conducted as specified in EPA 600-4-91-002. Chronic toxicity <br /> samples shall be collected at the discharge of the Manteca Wastewater Treatment Plant prior to its <br /> entering the River. Twenty-four hour composite samples shall be representative of the volume and <br /> quality of the discharge. Time of sample collection shall be recorded. Chronic toxicity monitoring shall <br /> include the following: <br />