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4 A specific person is designated sample Control officer with the following responsibilities: 1) Determine it there is sufficient quantity of s;smple to perform requested analyses and if requested turnaround time is adequate to meet holding time regulations. 2) Perform additional preservation as required, Including splitting of samples into appropriate containers. 3) Composite samples as needed. In the case of volatiles, provide ( cription of compositing necessary to analys•:. 4) Assign a unique sample number to each sample. The sample number is marked on the sample' container and on the laboratory worksheet for the sample. 5). Store the samples in one of several designated refrigerators or shelves for the particular type of analysis required. Each analyst is aware of and responsible for meeting holding time requirements. Following analysis, samples Are stored for three weeks in case follow-up or confirmatory analyses are requested by the client. ® Samples determined to be hazardous are returned to the client. The chain -of custody is continued, or else a release form in signed by the client. Maintenance and Calibration of Instruments f ' Major instruments are professionally serviced whenever It is deemed necessary, and in any case at least once a year. Maintenance records are kept in a bound notebook. F All instruments are calibrated using at least three standards, and a permanent calibration record is kept. Thereafter, daily standards are run and should generally read within 10% of the calibration curve. some instruments require calibration for each analyte to be tested. Quality Control Protocol e We employ a Quality Control officer who is responsible for the design and implementation of our QA/QC systems and protocols.