Agmt18 Recology - Laserfiche WebLink

Browse Search

Attachment E-1 Contamination Measurement Methodology: Single Loads 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 Estimated Number of Expected Material stream sample weight samples statistical error range Commercial Source - Separated and Targeted 150 lbs. 5 4% Recyclable Materials Commercial Organic 200 lbs. 15 7% Materials Commercial Plant Materials 150 lbs. 5 1% Single -Family Targeted 150 lbs. 5 2% Recyclable Materials Single -Family Organic 150 lbs. 5 1% Materials - 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 Contractors 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 Sampling and sorting area designation Sample selection Collection Services Franchise Agreement with Recology San Mateo County City of Redwood City AT711E,t9fSRtHOMM54/Recology of San Mateo Attachment E-1 Contamination Measurement Methodology Page 2 of 14