Environmental data is very important in the policy-making process. EPA has contracted lots of projects for manitoring,collecting,and analyzing the environmental data. In order to obtain high qnality data, series of control processes,should be conducted,including sampling, sample storage and handling, instrument calibrations and measurements and data processing. The primary goal of Quality Assurance Project Plan(QAPP) is to ensure that all environmental data, derived by contracted project, are of sufficient quality to support the data#s intended use. An audit program is necessary to make sure that the quality of QAPP has been fulfilled. This project has been conducted to evaluate the data quality of EPA contracted projects. There are total 43 project included in this program, 33 EPA projects and 10 local government projects were audited, Two seminars were also held. The goals of this project have been fulfilled after all.

Quality Assurance Project Plan(QAPP),Data Audit,audit program