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Attachment E-1 Contamination Measurement Methodology: Single Loads the designated sorting area. Next, the sampling crew will sort the Contamination materials, as defined in Appendix 1, out of the load and into sort containers. The sampling crew will then weigh the Contamination materials while the sampling crew manager records the weights on the tally form. The remainder of the load—all acceptable items—will be put into containers, weighed, and recorded on the tally form. The sampling crew manager is responsible for monitoring the homogeneity of material in each container and ensuring the accuracy of the sorting process. At the end of each sampling day the sampling crew will comply with any tipping floor staff directions regarding cleaning the designated sampling and sorting area and storing sampling and sorting supplies. Sample disposal After the weight of all material in each sample is recorded on the tally sheet, the sampling crew will move the sorted material to a location where it is safe and convenient for the loader to remove. Data management At the end of each sampling day, the sampling crew manager will review all forms for accuracy and completeness. Any issues shall be resolved immediately while the day's work is still fresh in the mind. To ensure the tally forms are not lost before inputting the data into an electronic form, copies shall be made of all completed forms and copies will be kept in a place separate from the originals. One copy of the forms will be mailed or hand delivered to the person inputting the data into an electronic form. The appendices cover calculations, data collection forms, and an equipment list for this study. 5. Sorting categories All loads identified for sorting shall be sorted and weighed into the following two (2) categories: 1) Contamination 2) Targeted Recyclable Materials, Source -Separated Targeted Recycable Materials, Organic Materials, or Plant Materials 6. Calculations Estimates of Contamination and Targeted Recyclable Materials, Source -Separated Targeted Recyclable Materials, Organic Materials, or Plant Materials will be calculated using a method that gives equal weighting or "importance" to each sample within a given stream. Confidence intervals (error ranges) will be calculated based on assumptions of normality in the composition estimates. In the descriptions of calculation methods, the following variables will be used: • i denotes an individual sample. • j denotes the material type. • c/ is the weight of the material type j in a sample. • w is the weight of an entire sample. • rj is the composition estimate for material j (r stands for ratio) Collection Services Franchise Agreement Attachment E-1 with Recology San Mateo County Contamination Measurement Methodology City of Redwood City ATTWAGIRIBOM U54/Recology of San Mateo Page 5 of 14