ARCHIVED REPORTS XR0012595 - Laserfiche WebLink

Home Browse Search

�. w IR i "". B-3 longer than the maximum allowable holding time. Details on the procedure Eur collection and hard ttg of soil samples used on this project can be tbund in Section 1.0(Methods). 3,Z Sample Identifcsntiot:' -id Chain-of-C�ustod Plocedures ' Sample identification and chain-of-= �.o Aure,censure sample integrity and document sample possession from the time of collection to its ultimate disposal. Each sample container submitted for analysis had a!noel affixed to identify Ilse job number,sampler,date,and time of sample collection,and a sample "? number unique to thrt sample. This information, in addition to a description of the sample, field measurements matte, sampling methodology, names of on-site personnel, and any other pertinent filed obser.+aiions were receriled on the borehole log or in the field records. Samples were analyzed by a ? R California-certified laboratory. �. A chain-of- .—tody form was used to record possession of the sample from time of collection to its arrival at the laboratory. When the samples were shipped, the person in custody of them will relinquished the w samples by signing the chain-0f-custody form and toting the time. The sample-control officer at the r 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 nlnalysis. If these conditions are met, the sample was assigmed a unique log nt unber for identificadon'firoughout analysis and reporting. The log number waw, recorded on the chain-of-custody form and in the legally- requirtd log book maintained by the laforatory in the laboratory. The sample description,date received, client's name,and any other relevant Information was also recorded. 3!3 Analytical Quality Assura%S In addition to routine calibration of the analytical instruments urith standards and blanks, the analyst is required to run duplicates and spikes on 10 percent of the analyses to insure an added measure of precision and accuracy. Accuracy is also verified through the following: 1. EPA and state-certified programs. 2. Participation in an interlaboratory or "round robin" quality assurance program. 3. Verification of results with zn alternative method. For example,calcium maybe determined by - -------- atomic absorption,ion,chromatography,or dwinetric methods.--'Volatile arpnica-may be------ ------------ - `- determined through either purge and trap or liquid-liquid extraction medtods. z :F