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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2003-0049 -24- FORWARD INC. AND ALLIED WASTE INDUSTRIES FOR OPERATION OF FORWARD CLASS II LANDFILL SAN JOAQUIN COUNTY 21. Response to Detection in Background of VOCs (or any other constituent which is not naturally in the background and thus is not amenable to statistical analysis): a. Any time the laboratory analysis of a sample from a background monitoring point, sampled for VOCs, shows either: 1) Two or more VOCs at or above their respective MDL; or 2) One VOC at or above its respective PQL. Then the Discharger shall: a) Immediately notify the Board by phone; b) Follow up with written notification by certified mail within seven days; c) Obtain two new independent VOC samples from that background monitoring point; and d) Send such samples for laboratory analysis of all detectable VOCs within thirty days. b. If either or both the new samples validates the presence of VOC(s), using the above criteria, the Discharger shall: 1) Immediately notify the Board about the VOC(s) verified to be present at that background monitoring point, and follow up with written notification submitted by certified mail within seven days of validation; and 2) If the Discharger believes that the VOC(s) in background is from a source other than the Unit, then: a) Within seven days of determining"measurably significant" evidence of a release, submit to the Board by certified mail a Notification of Intent to make such a demonstration pursuant to §20420(k)(7) of Title 27; and b) Within 90 days of determining"measurably significant"evidence of a release, submit a report to the Board that demonstrates that a source other than the Unit caused the evidence, or that the evidence resulted from error in sampling, analysis or evaluation, or from natural variation in groundwater, surface water, or the unsaturated zone.