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