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Attachment E-1 Contamination Measurement Methodology: Single Loads <br />REV: 03-16-18 MI <br />ATTY/AGR/2018.054/RECOLOGY OF SAN MATEO ATTACHMENT E <br />Page 6 of 14 <br />• rj is the composition estimate for material j (r stands for ratio). <br />• a denotes a region of the state (a stands for area). <br />• s denotes a particular sector or subsector of the waste stream. <br />• n denotes the number of samples in the particular group that is being analyzed at that <br />step. <br />a) Estimating the Composition <br />The following method will be used to estimate the composition of waste belonging to the <br />Commercial Source-Separated and Targeted Recyclable Materials, Commercial Organic <br />Materials, Commercial Plant Materials, Single-Family Targeted Recyclable Materials, and Single- <br />Family Organic Materials streams. <br />For a given stream, the composition estimate denoted by rj represents the ratio of the component’s <br />weight to the total weight of all the samples in the stream. This estimate will be derived by <br />summing each component’s weight across all of the selected samples belonging to a given stream <br />and dividing by the sum of the total weight of waste for all of the samples in that stream, as shown <br />in the following equation: <br /> <br />r <br />c <br />wj <br />ij <br />i <br />i <br />i <br />= <br />∑ <br />∑ <br /> <br />(1) <br />where: <br />• c = weight of particular component <br />• w = sum of all component weights <br />• for i = 1 to n, where n = number of selected samples <br />• for j = 1 to m, where m = number of components <br /> <br />6.2.B. - Page 167