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e <br /> MONITORING AND REPORTING PROGRAM -12- <br /> FOR CITY OF STOCKTON <br /> AUSTIN ROAD LANDFILL FACILITY <br /> CLASS III LANDFILL <br /> SAN JOAQUIN COUNTY <br /> (1) The mean(or median, as appropriate)and standard deviation(or other <br /> measure of central tendency, as appropriate) of the constituent's background <br /> data; or <br /> (2) The constituent's MDL, in cases where less than 10% of the background <br /> samples exceed the constituent's NIDL; or <br /> c. A concentration limit greater than background, as approved by the Board for use during <br /> or after corrective action. <br /> The Discharger proposes to use intrawell comparisons to detect release of wastes from the <br /> landfill, however, the Discharger has not submitted sufficient data to demonstrate natural ground <br /> water variations between upgradient and downgradient wells require the use of intrawell <br /> comparisons. Until a satisfactory demonstration is made, the upgradient well MW-2 will serve as <br /> the background well for the site. Background well MW-3 is suspected of being impacted and <br /> therefore will not be considered as a background well for the establishment of concentration <br /> limits. Concentration limits for ground water are shown in the following table. <br /> it <br />