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MONITORING AND REPORTING PROGRAM NO. R5-2004-0028 11 NPDES NO. CA0081558 CITY OF MANTECA, CITY OF LATHROP AND DUTRA FARMS WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUIN COUNTY 1 Groundwater elevation shall be used to calculate the direction and gradient of groundwater flow. Elevations shall be measured to the nearest one-hundredth of a foot from mean sea level. The groundwater elevation shall be measured prior to purging the wells. 2 A hand-held field meter may be used,provided the meter utilizes a USEPA-approved algorithm/method and is calibrated and maintained in accordance with the manufacturer's instructions. WATER SUPPLY MONITORING A sampling station shall be established where a representative sample of the municipal water supply can be obtained. The following shall constitute the water supply monitoring program. Sampling Constituents Units Freauency Standard Minerals' mg/l Yearly Electrical Conductivity, umhos/cm Yearly @ 25°C Total Dissolved Solids mg/1 Yearly 1 Standard minerals shall include all major cations and anions, including calcium, magnesium, hardness, sodium,potassium, alkalinity, sulfate, chloride, boron, and nitrate, and verification that the analysis is complete (i.e., cation/anion balance). z If the water supply is from more than one source,the EC shall be reported as a weighted average and include copies of supporting calculations. REPORTING Monitoring results shall be submitted to the Regional Board by the first day of the second month following sample collection. Quarterly and annual monitoring results shall be submitted by the first day of the second month following each calendar quarter, semi-annual period, and year, respectively. In reporting the monitoring data, the Discharger shall arrange the data in tabular form so that the date, the constituents, and the concentrations are readily discernible. The data shall be summarized in such a manner to illustrate clearly whether the discharge complies with waste discharge requirements. The highest daily maximum for the month,monthly and weekly averages, and medians, and removal efficiencies(%) for BOD and Suspended Solids, should be determined and recorded.