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<br />Commercial Organic Materials, approximately fifteen (15) samples of two hundred (200) <br />pounds are required for sampling to achieve the specified level of accuracy. <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) A 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 five (5) samples <br />per load, or fifteen (15) samples per load in the case of Commercial Plant Materials. <br /> <br />Table 1: Samples per Load and Results <br /> <br /> Estimated Number of Expected <br />Material stream sample weight samples statistical <br /> error range <br /> ~ <br />Commercial Source- <br />Separated and Targeted 150 Ibs. 5 40/0 <br />Recyclable Materials <br />Commercial Organic 200 Ibs. 15 70/0 <br />Materials <br />Commercial Plant Materials 150 Ibs. 5 10/0 <br />Single-Family Targeted 150 Ibs. 5 20/0 <br />Recyclable Materials <br />Single-Family Organic 150 Ibs. 5 10/0 <br />Materials <br /> <br />The error ranges shown above shall be interpreted as follows. When the calculation <br />method described below provides the Measured Contamination Level of a load, the <br />estimate will be expressed in terms of percent by weight of the entire load. The error <br />range around the estimate reflects a percent by weight of the entire load. Thus, if the <br />Measured Contamination Level for a given material stream is five percent (50/0), plus or <br />minus one percent (10/0), then ninety percent (900/0) confidence that the Contamination is - <br />between four percent (40/0) and six percent (60/0) of the entire load is achieved. <br /> <br />It is expected that a two (2) person crew can obtain, sort, and weigh five (5) samples in a <br />five (5) to seven (7) hours period. <br /> <br />4. Test procedures <br />Test procedures are broken down in to the following steps, which shall be used by <br />AUTHORITY, or a third party designated by the AUTHORITY. <br /> <br />· Safety training and staff coordination <br />· Sampling and sorting area designation <br />· Sample selection <br />. Sample sorting <br />· Sample disposal <br />· Data management <br /> <br />Facility Agreement, Attachment 2E <br />Contamination Measurement Methodology <br />Page 4 of 15 <br />