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MONITORING AND REPORTING PROGRAM ORDER NO. R5-2008-0149-029, Revision 1 -3- <br /> UNIFIRST STOCKTON <br /> SAN JOAQUIN COUNTY <br /> FIELD SAMPLING <br /> In addition to the above sampling and analysis, field parameter sampling and analysis shall <br /> be conducted each time a monitoring well or extraction well is sampled. The sampling and <br /> analysis of field parameters shall be as specified in Table 4. <br /> Table 4: Field Sampling Requirements <br /> Minimum Unit <br /> Parameters Units Type of Sample of <br /> Measurement <br /> Groundwater Elevation Feet, Mean Sea Level Measurement 0.01 feet <br /> Oxidation-Reduction Potential Millivolts Grab 1 millivolt <br /> Electrical Conductivity us/cm, Grab 50 uS/cm2 <br /> Dissolved Oxygen mg/L Grab 1 mg/L <br /> pH pH Units Grab 0.1 pH Unit <br /> Field test instruments (such as those used to test pH and dissolved oxygen) may be used <br /> provided that: <br /> 1. The operator is trained in proper use and maintenance of the instruments; <br /> 2. The instruments are calibrated prior to each monitoring event; <br /> 3. Instruments are serviced and/or calibrated by the manufacturer at the recommended <br /> frequency; and <br /> 4. Field calibration reports are submitted as described in item (b) of the "Reporting" <br /> section of this MRP. <br /> ESTABLISHMENT OF BACKGROUND CONCENTRATION VALUES <br /> The Discharger developed background values for concentrations of dissolved iron, <br /> dissolved manganese, total dissolved solids and electrical conductivity in groundwater <br /> which are presented in the 31 May 2013 First Semiannual 2013 Groundwater Monitoring <br /> Report. Central Valley Water Board staff concur with the background values. <br /> REPORTING <br /> When reporting the data, the Discharger shall arrange the information in tabular form so that <br /> the date, the constituents, and the concentrations are readily discernible. The data shall be <br /> summarized in such a manner as to illustrate clearly the compliance with this Order. The <br /> results of any monitoring done more frequently than required at the locations specified in the <br /> Monitoring and Reporting Program shall also be reported to the Central Valley Water Board. <br />