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Y <br /> SAMPLE COMPOSITING <br /> Sample compositing is usually done to decrease the number of soil samples; for, <br /> laboratory analysis and to obtain an average concentration for a given. amount of <br /> soil. Compositing will only-be done with-samples collected from soil stockpiles for, s <br /> ' <br /> disposal. .The number of samples to be composxted for each given amount of soil is <br /> determined. by .the disposal facility. The compositing is always done by ;the <br /> laboratory so compositing instructions' will be -placed on the chain-of-custody <br /> documentation. Collect individual samples as you would for separate.:sample <br /> analysis. <br /> Compositing shall not be done when samples are collected for subsurface or surface <br /> contamination or from the bottom or sidewalls of excavations. <br /> 7 t, <br /> µ -jr 1K <br /> ■ t ' <br /> ! f <br />