Figure E-8. The attainment grid and zone codes are combined and the results are 
exported to an access database for further analysis. 
LITERATURE CITED 
Environmental Systems Research Institute (ESRI). 2007. ArcGIS 9.2. Redlands, CA. 
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. 9 October 2006. Chesapeake Bay Program Scientific and Technical Advisory 
Committee, Chesapeake Research Consortium, Edgewater, MD. 
U.S. Environmental Protection Agency. 2007. Ambient Water Quality Criteria for Dissolved 
Oxygen, Water Clarity and Chlorophyll a for the Chesapeake Bay and Its Tidal Tributaries - 
2007 Addendum, July 2007. EPA 903-R-07-003 Region III Chesapeake Bay Program Office, 
Annapolis, MD. 21403. 
9 VAC 25-260 Virginia Water Quality Standards. 2005. § 62.1-44.15 3a of the Code of 
Virginia. Retrieved February 21, 2007 from http://www.epa.gov/waterscience/standards/ 
wqslibrary/va/va_3_wqs.pdf 
appendix e 
Chesapeake Bay Water Clarity Assessment Framework 
