Quality Objectives and Criteria for Measurement Data. (A7) The Study will supplement existing data as necessary to assess risk to human health and ecological receptors and to define chemical constituent migration pathways. The objectives of the Study are determined using the seven-step process defined in USEPA’s Guidance for the Data Quality Objectives Process (EPA QA/G 4, August 2000) and USEPA Region 5 Guidance. The DQOs will reflect the use of analytical methods for identifying and addressing contamination consistent with the levels for potential remedial action identified in the National Contingency Plan (NCP), 40 CFR Part 300 (NCP), the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA), as amended by the Superfund Amendment and Reauthorization Act of 1986 (XXXX), and guidance as provided in the Settlement Agreements.
Quality Objectives and Criteria for Measurement Data. The following sections provide a description of the development of DQOs and guidance on data quality ind icators for measurement data. RWQCB site investigations are tiered and potentially include evaluation of all environmental media. The two types of data that may be collected include : Screening level data, which m ay be used for information on nature and ext ent of contamination, preliminary investigations, and site characterization. Definitive level data, which m ay be used for all purposes , including site closure and risk assessment.
Quality Objectives and Criteria for Measurement Data. Quality Assurance is a management function. It deals with setting policy and running an administrative system of management controls that cover planning, implementation, and review of data collection activities. Quality control is technical in nature and is implemented at the project level. It includes all the scientific precautions, such as calibration and duplication, that are needed to acquire data of known and adequate quality. This project will include a synoptic survey and detailed field and laboratory studies to be determined following completion of Tasks 1 through 4. The data quality objectives for the field sampling programs are: • To obtain valid data that meet requested reporting limits for total, dissolved, and methylmercury in water and total and methylmercury in sediment at all sampling locations. • To obtain valid data that meet requested reporting limits for listed ancillary parameters in water and sediment at all sampling locations. The data quality objectives for the laboratory experiments will be included in the specific plans for those experiments. In general, the purpose will be to obtain necessary data to conclusively test proposed hypotheses. The chemical concentration data from field surveys and laboratory experiments will be evaluated based on accuracy, precision, representativeness, comparability, and completeness, as discussed in Section 3.4 of this QAPP. Other information from the field surveys will be reviewed for representativeness, comparability, and completeness.
