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Attachment E-1 <br />Contamination Measurement Methodology: Single Loads <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 <br />that step. <br />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, <br />and Single -Family Organic Materials streams. <br />For a given stream, the composition estimate denoted by r represents the ratio of the <br />component's weight to the total weight of all the samples in the stream. This estimate will <br />be derived by summing each component's weight across all of the selected samples <br />belonging to a given stream and dividing by the sum of the total weight of waste for all of <br />the samples in that stream, as shown in the following equation: <br />Y'Cii <br />ri <br />w; <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 />Collection Services Franchise Agreement <br />with Recology San Mateo County <br />City of Redwood City <br />ATIREAAl RUE10LW54/Recology of San Mateo <br />(1) <br />Attachment E-1 <br />Contamination Measurement Methodology <br />Page 6 of 14 <br />