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MONITORING AND REPORTING PROGRAM NO. R5-2004-0028 10 <br /> NPDES NO. CA0081558 <br /> CITY OF MANTECA, CITY OF LATHROP AND DUTRA FARMS <br /> WASTEWATER QUALITY CONTROL FACILITY <br /> SAN JOAQUIN COUNTY <br /> 2Each location shall be sampled during the month of April. <br /> 3Soluble salts shall be determined using test methods described in Methods of Soil <br /> Analysis,Part 2, Chemical and Microbiological Properties, Second Edition, Edited by <br /> Page,Miller and Keeney; American Society of Agronomy, Inc., Soil Science Society of <br /> America,Inc.: 1982 Page 168 et seq., or other acceptable test methods with prior <br /> approval by the Executive Officer. Analytical results shall report the soil/water ratio. <br /> 4Total Metals shall include analyses for Cadmium, Chromium, Copper, Lead,Nickel, and <br /> Zinc. <br /> GROUNDWATER MONITORING <br /> Prior to construction,plans and specifications for ground water monitoring wells shall be submitted to <br /> Regional Board staff for review and approval. Wells shall comply with requirements of the Department <br /> of Water Resources. Prior to sampling, the groundwater elevations shall be measured and the wells shall <br /> be purged of at least three well volumes until pH and electrical conductivity have stabilized. Samples <br /> shall be collected using standard USEPA methods. Groundwater monitoring shall include, at a <br /> minimum: <br /> Constituent Units Type of Sample Sample Frequency <br /> Depth to Groundwater Feet Measurement Quarterly <br /> Groundwater Elevation Feet Measurement Quarterly <br /> Total Dissolved Solids mg/I Grab Quarterly <br /> Ammonia, as Nitrogen mg/1 Grab Quarterly <br /> Nitrate, as Nitrogen mg/l Grab Quarterly <br /> PH pH Units Grab Quarterly <br /> Electrical Conductivityz @ 25°C umhos/cm Grab Quarterly <br /> Total Coliform Organisms MPN/100 ml Grab Quarterly <br /> Title 22 Metals mg/I Grab Quarterly <br />