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! a r Y + •• x y( 4 LABORATORY PROCEDURES The laboratories selected to perform the analytical work are certified by the California State Department of Health Services as being qualified to perform the selected analyses. The selected laboratories are reviewed by Exceltech, Inc. to ensure that theyare certified by the State of California and maintain an adequate quality control program The following procedures are used during sampling and analytical activities to provide chain-of-custody control during transfer of samples from collection through delivery to the laboratories. Record keeping activities used to achieve chain-of-custody comr-) are: • Contact made by sampling organization with facility supervisor and laboratory "M prior to sampling to alert them of dates of sampling and sample delivery. • Well Iocation map with well identification number(s)prominently displayed. Field log book for documenting sampling activities in the field. • Labels for identifying individual samples. ti . Chain-of-custody record for documenting transfer and possession of samples. i k Laboratory analysis request sheet for documenting analyses to be performed. Eield Filtr P ' Samplers will refrain from filtering TOC, TOX or other organic compound samples as ., the increased handling required may result in the loss of chemical constituents of interest. Allowin g the samples les to settle prior to analysis followed by decanting the Sample is preferabie to filtration of these substances. If filtration is necessary for the determination of extractable orgastic compounds, the filtration should be performed in i the laboratory. It may be necessary to run parallel sets of'filtered and unfiltered xr samples with standards to establish the recovery of hydrophobic compounds when s EXCELTECH, INC. Laboratory Procedures Latest Revision: March 28, 1990