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THE NATIONAL ATMOSPHERIC DEPOSITION PROGRAM/NATIONAL TRENDS NETWORK (NADP/NTN) SITE VISITION PROGRAM (OCTOBER 1986 THROUGH SEPTEMBER 1987)
Citation:
Eaton, W., C. Moore, R. Murdoch, D. Ward, AND R. Shores. THE NATIONAL ATMOSPHERIC DEPOSITION PROGRAM/NATIONAL TRENDS NETWORK (NADP/NTN) SITE VISITION PROGRAM (OCTOBER 1986 THROUGH SEPTEMBER 1987). U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-89/007.
Description:
Survey visits to the NADP/NTN precipitation collection stations are part of the network's quality assurance program and are coordinated through the NADP/NTN Quality Assurance Director's office. Research Triangle Institute, under contract to EPA, has visited approximately two-thirds of the 200 NADP/NTN sites for the purposes of verifying and documenting that pre-established siting criteria are met; assessing the uniformity of sample collection, analysis, and reporting procedures; conducting quality assurance tests of the operators' equipment and procedures, and providing technical assistance and instruction. Of the approximately 120 sites visited from October 1986 through the present, most are operating within specified guidelines. Variances such as out-of-calibration rain gauges, pH electrode response accuracy outside 0.1 pH unit tolerance inoperative precipitation collector sensor heaters, and siting variations are summarize and compared to the findings from the first round of visits. Test methods and significant findings are summarized.