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J <br />IATTACHMENT A <br />Sample Determination for Waste Characterization <br />San Joaquin County <br />INTRODUCTION: <br />The number of samples required for a statistical) <br />P q Y <br />representative sampling of residential waste was determined using <br />guidelines set forth by 14 CCR, section 18726. As referenced in <br />this section (Appendix 1) of the California Code of Regulations, a <br />quantitative analysis was used for the normal approximation of a <br />waste category found in: A. J. Klee and D. Carruth's article, <br />"Sample Weights in Solid Waste Composition Studies", American <br />Society of Civil Engineers Journal of the Sanitary Engineering <br />Division, volume 96(SA4), pages 945-954, August 1970. <br />Calculations were performed using data gathered from a waste <br />characterization study conducted for the County of San Joaquin. The <br />parameters of this sampling determination included a 90% confidence <br />level along with one and two precision units to determine the <br />number of samples required for each component of the residential <br />waste stream. <br />PROCEDURE <br />The <br />eneral procedure used in these calculations followed the <br />g <br />guidelines and formulas of the article referenced above by Klee and <br />Carruth. Although the article was rather specific with respect to <br />the study conducted, calculations for San Joaquin County deviated <br />little from the methods used in this article. <br />For the first step, the weights of each component were <br />converted to percentages of the total weight of the samples. Next, <br />a stabilizing aresin transformation was used to convert the <br />individual percentages in decimal form to a working form compatible <br />with the formula for determining the number of samples. As a final <br />I� <br />