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Monitoring and Reporting. ogram No. 8 <br /> J.R. Simplot Company <br /> Lathrop, San Joaquin County <br /> Table 4 <br /> Class II Surface Impoundments Monitoring <br /> Report in Sampling <br /> Parameter/Constituent Units of Frequency <br /> Minimum Freeboard' Tenths of feet Weekly <br /> Quantity Discharged Gallons/day Daily <br /> Remaining Capacity3Percent Quarterly <br /> Temperature Degrees Celsius Quarterly <br /> PH Standard pH units Quarterly <br /> Specific Conductivity µmhos/cm Quarterly <br /> Total Dissolved Solids mg/L Quarterly <br /> Sodium mg/L Quarterly <br /> Chloride mg/L Quarterly <br /> Sulfate mg/L Quarterly <br /> Nitrate mg/L Quarterly <br /> Chemical Oxygen Demand mg/L Annually <br /> Volatile Organic Compounds4 µg/L Annually <br /> Total Petroleum Hydrocarbons n/L Annually <br /> Minerals mg/L Annually <br /> Metals mg/L Annually <br /> Impoundment Freeboard shall be measured weekly and reported quarterly. <br /> 230-day average and daily maximum flows shall be reported quarterly. <br /> 3Capacity determination shall incorporate the estimated volume. <br /> 4Use EPA Method 8260B. Report all peaks. <br /> 5Use EPA Method 8015M for gasoline and diesel. <br /> 6Those minerals listed under Table 2, Groundwater Monitoring. <br /> 7Those metals listed under Table 2, Groundwater Monitoring. <br /> 5. Storm Water Surface Impoundment Monitoring <br /> The Storm Water Surface Impoundment shall be sampled and analyzed as specified in <br /> Table 5 below and within 24 hours of the first two storms of the wet season that produce <br /> significant flows. Storm Water Surface Impoundment monitoring reports may be submitted <br /> with the corresponding quarterly groundwater monitoring reports. <br />