1. Chowan River TMDL Development Tidewater Area 08/26/04

2. TMDL Development Historical data analysis Source assessment Bacterial source tracking Modeling Allocation

3. Fecal Coliform Impairments Impaired Stream Segments in the Back Bay and North Landing River watersheds

4. Water Quality Data Analysis Location of VADEQ water quality monitoring stations in the Back Bay and North Landing River watersheds

5. Water Quality Data Analysis Fecal Coliform Concentrations

6. Water Quality Data Analysis E. coli concentrations for period July 2002 through March 2004

7. Water Quality Data Analysis Statistical Analysis of Water Quality Measurements versus Precipitation to determine the relationship between rainfall and water quality Summary of the Mood Median Test on mean monthly precipitation at station 444101 (p=0.013).

8. Source Assessment Identification of Sources DEQ/DCR/Locality records Ag Census Habitat Analysis Stakeholders, local knowledge BST Source Characterization Fecal production / densities / distribution Delivery Mechanisms Direct Land-applied Exported Out of Watershed Temporal Variation

9. Permitted Discharges * Farm no longer active Two permitted dischargers – one in West Neck, one in Nawney Creek. Only one is currently active.

10. Human (2004) ImpairmentPopulation Housing Units (HU) HU with Sewer HU with Septic HU with Other Milldam Creek 151571515 Nawney Creek 70326402604 West Neck Creek 45,46515,18913,5971,57220

11. Human Sanitary sewer Overflows - reported to DEQ Exfiltration – rate from literature Failing septic systems Rate based on age of house Straight pipes U.S. Census and VDH consultation

12. Reported Sewer Overflows Frequent overflows in West Neck Creek Drainage. 55 events reported between July 1999 and May 2004. Uncertainty as to whether all overflows are reported/observed. Mean overflow volume of 109 gallons.

13. Pets (2004) ImpairmentDogsCats Milldam Creek 3034 Nawney Creek 141158 West Neck Creek 8,1119,083

14. Estimated Livestock - 1997 ImpairmentBeefDairyHorseSheepPoultrySwine Nawney Creek 8 1 267 20 05187* West Neck Creek 11 0 425 32 08280* Milldam Creek 0 0 25 2 0494*

15. Estimated Livestock - 2002 ImpairmentBeefDairyHorseSheepPoultrySwine Nawney Creek 8 1 267 20 03705* West Neck Creek 11 0 425 32 0377* Milldam Creek 0 0 25 2 023*

16. Livestock Average percentage of collected livestock waste applied throughout year

17. Wildlife Population ImpairmentDeerGooseDuckMuskratRaccoonBeaverSeagull Milldam Creek 238215124130442TBD Nawney Creek 491744255733234TBD West Neck Creek 1946617513327167118TBD

18. Wildlife

19. Source Assessment

20. Bacterial Source Tracking Location of BST stations in the Back Bay and North Landing River watersheds

21. Modeling Hydrologic model Runoff model HSPF Water Quality model Tidal/Estuary model CE-QUAL-W2 Model Calibration and Validation Based on data availability, period of interest

22. Modeling

24. VADEQ Station 5BWNC010.02 and USGS Station #02043200

25. Modeling VADEQ Station 5BMLD001.92 and USGS Station #02043200

26. Modeling VADEQ Station 5BNWN001.84 and USGS Station #02043200

27. Modeling VADEQ Station 5BNWN000.00 and USGS Station #02043200

28. Hydrologic Calibration Sample

30. Allocation Develop reduction scenarios that will meet water quality standards 100% reduction in straight pipes, 25% reduction in failed septic systems 100% reduction in straight pipes, 50% reduction in livestock direct deposition Allocate loads to each source

31. Allocation