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Laboratory quality assurance/quality control procedures are summarized below: <br /> Method Blank Frequency=one per 20 samples <br /> Matrix Spike/Matrix Spike Duplicate= one per 20 samples <br /> Laboratory Control Sample/Laboratory Control Sample Duplicate = one per 20 <br /> samples <br /> Information regarding sample containers,preservation, and holding times is presented in Table A-1. <br /> Work Plan <br /> IT Corporation Page A - 3 All Pure,Tracy <br />