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' INTERNATIONAL TECHNOLOGY CORPORATION <br /> 3.6 QUALITY ASSURANCE/QUALITY CONTROL <br /> Investigative procedures conformed to IT Corporation Engineering Operations Quality <br /> Assurance Manual and Tri -Regional Board Staff Recommendations for Preliminary <br />' Evaluation and Investigation of Underground Storage Tank Sites, 10 August 1990 <br /> r <br /> 1 <br /> i <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 9 <br />