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MONITORING AND REPORTING PROGRAM NO. R5-2010-0016 -14- <br />SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS <br />NORTH COUNTY LANDFILL <br />SAN JOAQUIN COUNTY <br /> <br /> <br /> <br />or measurement, units, and CLs, as applicable. Any exceedances of CLs <br />shall be highlighted or otherwise clearly shown. Non-detect results shall <br />indicate the applicable detection limit (e.g., “<0.3”). <br />e. An analysis of the monitoring data, including the following: <br />1) Background Monitoring <br />i. Identifying historical trends <br />ii. Developing/updating CLs for monitoring parameters and COCs, as <br />appropriate <br />2) Detection Monitoring <br />i. Comparing monitoring data with CLs to identify any exceedances <br />ii. Retesting, as required, if release tentatively indicated. <br />iii. Checking for previous similar or potentially related exceedances (e.g., <br />sporadic, recurring) in same media. <br />iv. Checking for similar or potentially related exceedances in other media <br />(e.g., unsaturated zone). <br />v. Whether a release was indicated by physically significant evidence. <br />vi. Whether a leak occurred in a sump or containment system. <br />3) Graphics <br />i. Water chemistry analysis <br />⇒ Cation/anion balance <br />⇒ Graphs (e.g., Piper, Trilinear, Schueller, and/or Stiff plot) <br />ii. Time series plots <br />⇒ Provide for each constituent for which there are three or more data <br />points, including non-detect values, at each monitoring point. <br />⇒ Data for multiple monitoring points, or multiple constituents, may <br />be plotted on same graphic if scaling compatible. <br />⇒ Scale for maximum range of data (excluding outliers). <br />⇒ Use compatible graphics (e.g., symbols, line type, color, icon size) <br />so each plot can be easily distinguished and read <br />⇒ Limit amount of information (e.g., number of constituents or <br />monitoring points) on each graphic to maintain clarity <br />⇒ Use plotting program that reads sampling dates <br />iii. Trend analysis <br />⇒ Provide for representative parameters/constituents for which there <br />are four or more data points above the PQL, at each monitoring <br />point.