Laserfiche WebLink
• • <br /> 2. Sampling rationale <br /> Load samples shall be collected from each material stream identified above. The <br /> sampling plan considers the SBWMA Service Area as a single source of materials <br /> generation. Each materials stream will be considered as separate sampling population. <br /> 3. Sampling allocation and calendar <br /> A total of twelve (12) samples shall be collected from each materials stream per quarter <br /> to achieve the agreed upon desired level of statistical accuracy. Additional samples may <br /> be collected in accordance with the last paragraph of this Section 3 and in such cases, <br /> all samples taken shall be used to calculate the Measured Contamination Level(s) for <br /> that quarter. <br /> The specified number of samples are based on the following factors: <br /> 1) An analysis of the composition variability among samples that were sorted during <br /> waste characterization studies of similar waste streams and programs in other <br /> west coast communities. <br /> 2) An agreement on the acceptable level of accuracy <br /> Table 1 indicates the statistical confidence intervals (error ranges) at the ninety percent <br /> (90 %) confidence level that are expected to result from characterizing twelve (12) <br /> samples per quarter and forty -eight (48) samples per year with respect to each material <br /> stream. <br /> Table 1: Samples per Load and Results <br /> Quarterly samples and Annual samples and results <br /> results <br /> Estimated Number of Approximate Number of Approximate <br /> Material stream sample truckloads statistical truckloads statistical <br /> to be to be <br /> weight sampled' error range sampled' error range <br /> Commercial <br /> Source - <br /> Separated and 150 Ibs 12 3% 48 1.5% <br /> Targeted <br /> Recyclable <br /> Materials <br /> Commercial <br /> Organic 200 Ibs 12 8% 48 4% to 5% <br /> Materials <br /> Commercial 150 Ibs 12 1% 48 0.5% <br /> Plant Materials <br /> Single - Family <br /> Targeted 150 Ibs 12 2% 48 1% <br /> Recyclable <br /> Materials <br /> Single - Family <br /> Organic 150 Ibs 12 1% 48 0.5% <br /> Materials <br /> 1 The error ranges in Table 1 are based on one (1) sample per truckload. <br /> Franchise Agreement for Collection Services with Recology San Mateo County Attachment E -2 <br /> Redwood City Page 2 of 19 <br />