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Attachment E-1 <br />Contamination Measurement Methodology: Single Loads <br />This Attachment presents the methodology for quantifying the Contamination Level of <br />single load(s) of Recyclable Materials Collected in the Service Area and delivered to the <br />Designated Transfer and Processing Facility by Contractor. <br />This Attachment is organized into the following six (6) sections: <br />1. Objectives -describes the purpose of the methodology. <br />2. Sampling rationale -defines which loads will be sampled. <br />3. Sampling allocation -describes the number of samples required to provide a <br />sufficient level of accuracy in findings. <br />4. Test proceduresAescribes sampling and sorting activities for each load. <br />5. Sorting categories -describes the sorting categories. <br />6. Calculations <br />Appendices 1 through 3 consist of: <br />1. methodology checklist <br />2. sample data collection forms <br />3. equipment list <br />1. Objectives <br />This methodology is designed to estimate the Contamination Level (as a percentage by <br />weight of the entire load) in an individual load from five (5) inbound material types <br />Collected in the Service Area. These material streams are listed below and described <br />further in Section 3. <br />• Commercial Source Separated and Targeted Recyclable Materials <br />• Commercial Organic Materials <br />• Commercial Plant Materials <br />• Single -Family Targeted Recyclable Materials <br />• Single -Family Organic Materials <br />The methodology described herein is intended to produce consistent and statistically <br />reliable estimates of the Contamination Level of individual loads from the above material <br />streams. In addition, the methodology is designed to require the minimum necessary <br />organizational time and financial investment. <br />2. Sampling rationale <br />Loads may be selected for sampling when observation of the load by SBWMA or <br />Operator indicates that it may exceed the allowed Contamination Level. A statistical <br />sampling process will be used to determine the Measured Contamination Level in <br />individual loads. <br />3. Sampling allocation <br />Approximately five (5) samples, each weighing approximately one hundred and fifty <br />(150) pounds, are required from an individual load in order to calculate the Measured <br />Contamination Level with a sufficient level of accuracy for every material stream except <br />Collection Services Franchise Agreement <br />with Recology San Mateo County <br />City of Redwood City <br />AT'[PA, GfUCL10454/Recology of San Mateo <br />Attachment E-1 <br />Contamination Measurement Methodology <br />Page 1 of 14 <br />