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RCRA Permit Forward Landfill May 1991 EPA I.D. CAD 990 794 133 Modification 0 (2) The Owner/Operator shall take a minimum of one sample from each well and a minimum of four samples from the entire system used, to determine background ground water quality for each parameter and/or constituent each time the system is sampled. [40 CFR 264.97 (g) (4) ] 3. SAMPLING AND ANALYSIS PROCED S The Owner/Operator shall use the following techniques and procedures when obtaining and analyzing samples from the ground water monitoring wells described in Permit Condition 111. 1: [40 CFR 264.97 (d) and (e) ] (a) Samples shall be collected using the techniques described in Permit Attachment 1. (b) Samples shall be preserved and shipped in accor- dance with the procedures specified in Permit At- tachment 1. (c) Samples shall be analyzed in accordance with pro- cedures specified in Permit Attachment 1 . (d) Samples shall be tracked and controlled using the chain-of-custody procedures specified in Permit Attachment 1. (e) In detection monitoring or where appropriate in compliance monitoring, data on each hazardous con- stituent specified in the permit will be collected from background wells and wells at the compliance point(s) . The number and kinds of samples col- lected to establish background shall be ap- propriate for the form of statistical test employed, following generally accepted statistical principles. The sample size shall be as large as necessary to ensure with reasonable confidence that a contaminant release to ground water from a facility will be detected. The owner or operator will determine an appropriate sampling procedure and interval for each hazardous constituent listed in this permit. The sampling procedure shall be: (i) A sequence of at least four samples, taken at an interval that assures, to the greatest ex- tent technically feasible, that an independ- ent sample is obtained, by reference to the uppermost aquifer's effective porosity, 18