AgdaPkt 2018-03-26 Joint SA PFA - Laserfiche WebLink

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Attachment E-1 Contamination Measurement Methodology: Single Loads REV: 03-16-18 MI ATTY/AGR/2018.054/RECOLOGY OF SAN MATEO ATTACHMENT E Page 2 of 14 a sufficient level of accuracy for every material stream except Commercial Organic Materials. Because of the variability typically found in loads of Commercial Organic Materials, approximately fifteen (15) samples of two hundred (200) pounds are required for sampling to achieve the specified level of accuracy. The recommended numbers of samples are based on the following factors: 1) An analysis of the composition variability among samples that were sorted during waste characterization studies of similar waste streams and programs in other West Coast communities. 2) An agreement on the acceptable level of accuracy. Table 1 indicates the statistical confidence intervals (error ranges) at the ninety percent (90%) confidence level that are expected to result from characterizing five (5) samples per load, or fifteen (15) samples per load in the case of Commercial Plant Materials. Table 1: Samples per Load and Results Material stream Estimated sample weight Number of samples Expected statistical error range Commercial Source- Separated and Targeted Recyclable Materials 150 lbs. 5 4% Commercial Organic Materials 200 lbs. 15 7% Commercial Plant Materials 150 lbs. 5 1% Single-Family Targeted Recyclable Materials 150 lbs. 5 2% Single-Family Organic Materials- 150 lbs. 5 1% The error ranges shown above shall be interpreted as follows. When the calculation method described below provides the Measured Contamination Level of a load, the estimate will be expressed in terms of percent by weight of the entire load. The error range around the estimate reflects a percent by weight of the entire load. Thus, if the Measured Contamination Level for a given material stream is five percent (5%), plus or minus one percent (1%), then ninety percent (90%) confidence that the Contamination is between four percent (4%) and six percent (6%) of the entire load is achieved. The Parties agree that the actual Measured Contamination Level will be the sole determinant of the percentage of Contamination in a load, and of Contractor’s compliance with the maximum contamination levels. It is expected that a two (2) person crew can obtain, sort, and weigh five (5) samples in a five (5) to seven (7) hour period. 4. TEST PROCEDURES Test procedures are broken down in to the following steps, which shall be used by SBWMA , or a third party designated by the SBWMA. • Safety training and staff coordination 6.2.B. - Page 163