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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> MONITORING AND REPORTING PROGRAM NO. 88-124 <br /> NPDES NO. CA0081787 <br /> FOR <br /> THE MARLEY COOLING TOWER COMPANY <br /> STOCKTON, SAN JOAQUIN COUNTY <br /> INFLUENT MONITORING <br /> Influent samples shall be collected from the inlet piping to the treatment plant <br /> flow equalization basin. Influent samples shall be representative of the volume <br /> and nature of the inflow. Time of collection of grab samples shall be recorded. <br /> The following shall constitute the influent monitoring program: <br /> Sampling <br /> Constituents Units Type of Sample Frequency <br /> Total Chromium ug/l Grab Daily <br /> Copper ug/l Grab Daily <br /> Arsenic ug/l Grab Daily <br /> Total Dissolved Solids mg/l Grab Daily <br /> EFFLUENT MONITORING <br /> Effluent samples shall be collected in the North Yard pipeline that conveys <br /> effluent to the Stockton Diverting Canal . Effluent samples shall be representa- <br /> tive of the volume and nature of the discharge. Time of collection of grab <br /> samples shall be recorded. The following shall constitute the effluent monitoring <br /> program: <br /> Sampling <br /> Constituents Units IyEe of Sample Frequency <br /> Flow mgd Cumulative Continuous <br /> Hexavalent Chromium ug/l Probe** Continuous <br /> pH pH Units Probe** Continuous <br /> Total Chromium ug/l 24-hour composite Daily <br /> Arsenic ug/l 24-hour composite Daily <br /> Copper ug/l 24-hour composite Daily <br /> Total Dissolved Solids mg/l 24-hour composite Daily <br /> Bioassay % Survival Grab Monthly <br /> ** Results from the effluent monitoring probes for chromium and pH may be <br /> used. <br />