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Attachment E-1 Contamination Measurement Methodology: Single Loads After the loader has extracted the material in the selected cell, the sampling crew manager will guide the loader to a designated tarp. Using visual cues the sampling crew manager will ensure the loader operator(s) deposits the proper quantity of material on the tarp. A shovel may be used to add material from the bottom of the cell to ensure the sample includes some heavy and small material that the loader bucket cannot collect. Pulling the tarp is a basic test used to estimate sample weight.' If it is determined that a sample is too heavy it may be lightened by removing vertical slices from the sample. If it is determined that a sample is too light it may be increased by removing or adding more material. It is important to add or remove all material in the slice from the top to bottom, to ensure that both small, heavy, and loose materials and large, light, and bagged materials are added or removed. Samples can be queued and stored on tarps until sorted but samples must be prevented from mixing with each other and with other material on the tipping floor. The sampling crew manager will place a unique sample placard on each sample for a photograph and, if the sample is not immediately sorted, for later identification. The placard is marked with a unique sample identification number and additional information (such as the date) used to identify loads in photographs and correlate load net weights with sample details. Each placard will be coded according to its corresponding materials stream. (e.g., 'RSS- 1' indicates the first load of Residential single -stream recycling). Each load will be photographed individually with the sample placard visible and legible. Figure 1: Sixteen (16) cell grid 7 5 3 13 - 11 I - y 10 Note: Cells 12, 14 and 16 are below cells 4, 6 and 8, respectively. Sample sorting The sample identification number, as designated by the placard, will be recorded on the tally form (see Appendix 2 for an example of this form.) The sample will be moved into ' Samples of Commercial Source -Separated and Targeted Recyclable Materials, Single -Family Targeted Recyclable Materials, and Commercial Plant Materials shall weigh between one hundred and twenty five (125) pounds and one hundred and seventy five (175) pounds. Samples of Commercial Organic Materials and Single -Family Organic Materials shall weigh between one hundred and seventy five (175) pounds and two hundred and twenty five (225) pounds. Collection Services Franchise Agreement Attachment E-1 with Recology San Mateo County Contamination Measurement Methodology City of Redwood City ATIR0AC0tI20['8M54/Recology of San Mateo Page 4 of 14