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decision-rule point of view, they warrant special consideration. If one of the methods 
is more likely to be in error when these discrepancies occur, this finding will affect 
use of that method in the regulatory process. 
To address this issue, separate models of in situ chlorophyll and in vitro chlorophyll 
need to be developed for which the independent variables are taken from the suite of 
nutrient measurements (e.g., total nitrogen, particulate nitrogen, etc.). A pilot project has 
shown that these models are fairly predictive. In a case where a large discrepancy 
between the in situ and the in vitro measurements exists, if one is in agreement with its 
predictive model and the other is not, then the one out of agreement is likely in error. 
LITERATURE CITED 
Batiuk, R.A., P. Bergstrom, M. Kemp, E. Koch, L. Murray, J.C. Stevenson, R. Bartleson, V. 
Carter, N.B. Rybicki, J.M. Landwehr, C. Gallegos, L. Karrh, M. Naylor, D. Wilcox, K.A. 
Moore, S. Ailslock, and M. Teichberg. 2000. Chesapeake Bay Submerged Aquatic Vegetation 
Water Quality and Habitat-Based Requirements and Restoration Targets: A Second Technical 
Synthesis. CBP/TR 245/00 EPA 903-R-00-014. U.S. EPA Chesapeake Bay Program, 
Annapolis, MD. 
Chesapeake Executive Council. 2000. Chesapeake 2000. Chesapeake Bay Program, 
Annapolis, MD. 
Karrh, L. 1999. Comparison of Nearshore and Midchannel Water Quality Conditions. 200 
pp. Chesapeake Bay Program, Annapolis, MD. 
Maryland Department of Natural Resources. 2006. Quality Assurance Project Plan for the 
Maryland Department of Natural Resources Chesapeake Bay Shallow Water Quality Moni¬ 
toring Program for the period of July 1, 2006 - June 30, 2007. Maryland Department of 
Natural Resources, Annapolis, MD. 
Scientific and Technical Advisory Committee (STAC). 2005. Final Report of the Chesapeake 
Bay Scientific and Technical Advisory Committee Workshop: Evaluating the Design and 
Implementation of the Chesapeake Bay Shallow Water Monitoring Program Chesapeake Bay 
Program Scientific and Technical Advisory Committee Publication 05-003. 
Scientific and Technical Advisory Committee (STAC). 2006. The Cumulative Frequency 
Diagram Method for Determining Water Quality Attainment: Report of the Chesapeake Bay 
Program STAC Panel to Review Chesapeake Bay Analytical Tools. STAC Publication 06-003. 
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Chesapeake Research Consortium, Edgewater, MD. 
U.S. Environmental Protection Agency. 2003a. Ambient Water Quality Criteria for Dissolved 
Oxygen, Water Clarity and Chlorophyll a for the Chesapeake Bay and its Tidal Tributaries. 
EPA 903-R-03-002. Region III Chesapeake Bay Program Office, Annapolis, MD. 
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chapter vii 
Shallow-water Monitoring and Application for Criteria Assessment 
