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INTRODUCTION <br /> Chevron ' s corporate policy, with regard to environmental regula- <br /> tions is compliance, not only to the letter of the law but also <br /> within the spirit of the law. The groundwater monitoring program <br /> outlined in this manual complies with the EPA' s requirements . <br /> This is a dynamic program that responds to changes in regulations <br /> and improvements in technology. <br /> The Groundwater Monitoring Program is built around the following <br /> prudent principles of quality assurance: <br /> . Support From Management and Staff <br /> . Professional Expertise <br /> . High Quality Chemicals <br /> . Thorough Understanding and Adherence to EPA Accepted <br /> Methodology <br /> . State-of-the-Art Instrumentation <br /> • Use of Quality Control Samples <br /> The essential ingredients of the third edition of SW-846 are <br /> incorporated throughout the monitoring process . The Quality <br /> Control Division (QCD) uses several types of control samples, <br /> statistical evaluations, and several levels of data review. <br /> Audits are conducted periodically on both in-house and contract <br /> laboratories. <br />