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MONITORING AND REPORTING PROGRAM -9- FORWARD INC.,FORWARD LANDFILL SAN JOAQUIN COUNTY ii. For each Attachment F constituent that is newly added to the WMU's COC list, the discharger shall establish a referencebackground value in each monitored medium by analyzing at least one sample each quarter from each Background Monitoring Point for a period of at least one year following the date the constituent is submitted to the Board as a new COC. Once this reference set of background data is collected, the discharger shall include it as a separate,identified item in the next monitoring report submittal. For sites which have multi-unit detection monitoring systems,if any landfill unit lacks a functioning LCRS,CDCs shall be determined as above under"a. For MSWLFs lacking a functioning LCRS". The discharger shall monitor all COCl every five years. 2 . Concentration Limits The Concentration Limit for any given Constituent of Concern or Monitoring Parameter in a given monitored medium (e.g., the uppermost aquifer) at a shall be as follows, and shall be used as the basis of comparison with data from the Monitoring Points in that monitored medium: a. The background value established in the WDRs by the Board for that constituent and medium; b. The constituent's background value, established anew during each Reporting Period using only data from all samples collected during that Reporting Period from the Background Monitoring Points for that monitored medium. Either: i. The mean (or median, as appropriate) and standard deviation (or other measure of central tendency, as appropriate) of the constituent's background data; or ii. The constituent's MDL, in cases where less than 10% of the background samples exceed the constituent's MDL; or c. A concentration limit greater than background, as approved by the Board for use during or after corrective action. 3 . Monitoring Points SURFACE WATER MONITORING Surface water flows from on and around WMUs shall be sampled at the point(s) where they leave the facility boundary, during the first storm of the rainy season which produces significant flows.