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<br />In addition, the methodology is designed to require the minimum necessary <br />organizational time and financial investment. <br /> <br />2. Sampling rationale <br />Load samples shall be collected from each of the five (5) specified material streams. The <br />sampling plan considers the participating AUTHORITY Member Agencies as a single <br />source of materials generation. Material streams originating from the Service Area will <br />be considered as separate sampling populations. A total of forty-eight (48) samples shall <br />be collected from each sampling population to achieve the desired level of statistical <br />accuracy. In certain cases, an individual Agency may be selected for focused sampling <br />when there is reason to believe that material coming from that Agency exceeds the <br />established maximum Contamination Level. <br /> <br />3. Sampling allocation and calendar <br /> <br />Approximately forty-eight (48) samples are required per sampling population to achieve <br />the desired accuracy to reflect the Contamination Levels over a one (1) year timeframe. <br />The forty-eight (48) samples can be sorted in single sampling events; however-i this <br />preferred sorting frequency shall reflect collecting and sorting twelve (12) samples in <br />each of four (4) calendar quarters to capture seasonal variations. <br /> <br />The recommended numbers of samples are based on the following factors: <br /> <br />1) An analysis of the composition variability among samples that were sorted during <br />waste characterization studies of similar waste streams and programs in other <br />west coast communities. <br /> <br />2) An agreement on the acceptable level of accuracy <br /> <br />Table 1 indicates the statistical confidence intervals (error ranges) at the ninety percent <br />(900/0) confidence level that are expected to result from characterizing twelve (12) <br />samples per quarter and forty-eight (48) samples per year with respect to each material <br />stream. <br /> <br />Facility Agreement, Attachment 2-H <br />Contamination Measurement Methodology <br />Page 2 of19 <br />