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RCRA Permit - Forwa Landfill <br /> May 1991 <br /> EPA I.D. CAD 990 794 133 Modification 0 <br /> hydraulic conductivity, and hydraulic <br /> gradient, and the fate and transport charac- <br /> teristics of the potential contaminants, or <br /> (ii) An alternate sampling procedure proposed by <br /> the owner or operator and approved in writing <br /> by the Director. <br /> 4. ELEVATION OF THE GROUND WATER SURFACE <br /> (a) The Owner/Operator shall determine the elevation <br /> of the ground water surface at each well each time <br /> the ground water is sampled, in accordance with <br /> Permit Condition III.6(b) . [40 CFR 264.97(f) ] <br /> (b) The Owner/Operator shall record the surveyed <br /> elevation of all new monitoring wells when in- <br /> stalled, with their as-built drawings. <br /> 5. STATISTICAL PROCEDURES <br /> (a) The owner or operator will evaluate ground water <br /> monitoring data using a parametric analysis of <br /> • variance (ANOVA) followed by multiple comparisons <br /> - procedures to identify statistically significant <br /> evidence of contamination. The method must in- <br /> clude estimation and testing of the contrasts be- <br /> tween each compliance well's mean and the back- <br /> ground mean levels for each constituent. <br /> (b) The statistical method shall comply with the fol- <br /> lowing performance standards, as appropriate: <br /> (i) The statistical method used to evaluate <br /> ground water monitoring data shall be ap- <br /> propriate for the distribution of chemical <br /> parameters or hazardous constituents. If the <br /> distribution of the chemical parameters or <br /> hazardous constituents is shown by the owner <br /> or operator to be inappropriate for a normal <br /> theory test, then the data should be trans- <br /> formed or a distribution-free theory test <br /> should be used. If the distributions for the <br /> constituents differ, more than one statisti- <br /> cal method may be needed. <br /> If an individual well comparison procedure is <br /> used to compare an individual compliance well <br /> constituent concentration with background <br /> constituent concentrations or a ground water <br /> protection standard, the test shall be done <br /> at a Type 1 error level no less than 0. 01 for <br /> each testing period. If a multiple com <br /> 19 <br />