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MONITORING AND REPORTING PROGRAM NO. R5-2010-0016 -14- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS NORTH COUNTY LANDFILL SAN JOAQUIN COUNTY or measurement, units, and CLs, as applicable. Any exceedances of CLs shall be highlighted or otherwise clearly shown. Non -detect results shall indicate the applicable detection limit (e.g., "<0.3"). e. An analysis of the monitoring data, including the following: 1) Background Monitoring i. Identifying historical trends ii. Developing/updating CLs for monitoring parameters and COCs, as appropriate 2) Detection Monitoring i. Comparing monitoring data with CLs to identify any exceedances ii. Retesting, as required, if release tentatively indicated. iii. Checking for previous similar or potentially related exceedances (e.g., sporadic, recurring) in same media. iv. Checking for similar or potentially related exceedances in other media (e.g., unsaturated zone). v. Whether a release was indicated by physically significant evidence. vi. Whether a leak occurred in a sump or containment system. 3) Graphics Water chemistry analysis :::> Cation/anion balance => Graphs (e.g., Piper, Trilinear, Schueller, and/or Stiff plot) Time series plots => Provide for each constituent for which there are three or more data points, including non -detect values, at each monitoring point. => Data for multiple monitoring points, or multiple constituents, may be plotted on same graphic if scaling compatible. => Scale for maximum range of data (excluding outliers). Use compatible graphics (e.g., symbols, line type, color, icon size) so each plot can be easily distinguished and read Limit amount of information (e.g., number of constituents or monitoring points) on each graphic to maintain clarity Use plotting program that reads sampling dates iii. Trend analysis Provide for representative parameters/constituents for which there are four or more data points above the PQL, at each monitoring point. C7