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WASTE DISCHARGE RE IREMENTS ORDER NO. -13- SAN JOAQUIN COUNTY FOR POST-CLOSURE AND CORRECTIVE ACTION MONITORING CORRAL HOLLOW SANITARY LANDFILL SAN JOAQUIN COUNTY 2) the data contains one qualifying VOC that equals or exceeds its PQL. C. For Constituents of Concern: For five-yearly testing of all Constituents of Concern(CDCs),the "qualifying constituents"consist of COCs that are detected in less than 10% of applicable background samples. The Discharger shall conduct verification testing(see Detection Monitoring Specifications E.21. and E.23 below, as appropriate)to determine whether a release of COCl has occurred if the data for any monitoring point meets either of the following triggering conditions: 1) the data contains two or more qualifying constituents that equal or exceed their respective MDLs; or 2) the data contains one qualifying constituent that equals or exceeds its PQL. 20. Non-Statistical Method Retest. A non-statistical test method may be used by the Discharger to analyze the monitoring data for which it is impractical to conduct a statistical analysis. A non-statistical test method shall include a procedure to verify that there is "measurably significant" evidence of a release from the Unit. For the VOC,,ater,VOCspg, and nonstatistical COC test,the Discharger shall use a discrete retest consisting of two new samples from each indicating monitoring point. The Discharger shall conduct the retest for the standard nonstatistical method as follows: a. For VOCWater and VOCspg. Because the VOC composite Monitoring Parameter(for water or soil pore gas) is a single parameter which addresses an entire family of constituents likely to be present in any landfill release, the scope of the laboratory analysis for each of the two retest samples shall include all VOCs detectable in that retest sample. Therefore, a confirming retest, in accordance with Detection Monitoring Specification E.20.a. and b., above, for either triggering condition in either of the two retest samples, shall have validated the original indication even if the detected constituents in the confirming retest sample(s) differs from those detected in the sample which initiated the retest. b. For Constituents of Concern. Because all Constituents of Concern that are jointly addressed in the non-statistical test above,remain as individual Constituents of Concern,the scope of the laboratory analysis for the non- statistical retest of Constituents of Concern shall address only those constituents detected in the sample which initiated the retest. Therefore, the list of"qualifying constituents"for use in the retest, under Detection Monitoring