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MONITORING AND .• PROGRAM <br />FOR CITY • STOCKTON <br />AUSTIN <br />.•. LANDFILL FACILITY <br />CLASS III LANDFILL <br />SAN <br />ir• COUNTY <br />i. 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 />ii. The constituent's MDL, in cases where less than 10% of the background <br />samples exceed the constituent's MDL; or <br />c. A concentration limit greater than background, as approved by the Board for use <br />during or after corrective action. <br />The Discharger proposes to use intrawell comparisons to detect release of wastes from the <br />landfill. Sufficient data to demonstrate natural ground water variations between upgradient <br />and downeradient wells require the use of intrawell comparisons, has not been submitted. <br />Until a satisfactory demonstration is made, the upgradient well MW -2 will serve as the <br />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 />26 <br />