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SOP #12 <br /> Date:9/1/93 <br /> Page 19 of 31 <br /> routine soil samples taken for the investigation. One matrix spike/matrix spike <br /> duplicate will be prepared per 20 samples shipped to the laboratory, or every 30 days, <br /> whichever occurs first. <br /> The collection and handling of all QA/QC samples will be documented in the field <br /> notebook and/or on data collection forms. <br />