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e 13-3 1 longer than the maximum allowable holding time. Details on the procedure for collection and handling of soil samples used on this project can be found in Secacn 1.0(Methods). �g�pt�irf, tific tiQ.�gr�d�itatnor-Custody Pr cedyM Sample Identification and chain-of-custody procedures ensure sample integrity and document sample: possession from the time of collection to its ultimate disposal. ZIPch sample container submitted for analysts had a label.atfixed to identify the job number,sampler,data,aid time of sampl,collection,and a sample ' number unique to that sample. Minformation, in addition to a description of the sample, field { - measurements made, sampling methodology, names of on-site personnel, and any other pertinent filed observations were recorded on the borehole log or in the field records. Samples were analyzed by a f� California-certified laboratory. A chain-of-custody form was used to record possession of the sample from time of collection to its aerival g at the laboratory. When the samples were shipped, the person in custody of theme will relinquislred the j samples by signing the chain-of-custody form and noting the time. The sample-control officer at the laboratory would verify sample integrity and confirm that it was collected in the proper container,preserved correctly and that there is an adequate volume for analysis. If these conditions are met, the sample was assign'.a unique log number for identificafan tl'iroughout analysis and reporting. The log number was recorded on the chain-of-custody form and In the legally- required lug book maintained by the laboratory in the laboratory. The sample description,date received, — client's name,and any other relevant information was also recorded. t AMrsn In addition to routine calibration of the analytical instruments with standards and blanks, the analyst is — required to run duplicates and spikes on 10 percent of the analyses to insure an added tneastre of precision j and accuracy. Accuracy is also verified through the following: - 1. EFA and state-certified programs. 2-Farticipatian is a:a lnurlaboratory.or"round-robin" quality assurance program._---- _ - -------- 3. Verification of results with an alternative meibod. For example, calcium may be determined by . atomic absorption, ion chromatograf+hy, or titrimetric methods. ValatiIe organics may be 1 determined through either purge and trap'or liquid-liquid extraction methods.