1. ACCOTINK CREEK @ AIRFIELD RUNWAY & RECHLORINATION PLANT PROJECTS GARRISON FORT BELVOIR, FAIRFAX, VA CONSTRUCTED Dec 2-5, 2008

2. LONGITUDINAL PEAKED STONE TOE PROTECTION (LPSTP) Built with Virginia DOT Class II stone, level-crested @ 3 ft above the base-flow water surface elevation & trenched 3 ft into the bed. One row of live willow poles (3 poles/ft) planted in the LPSTP & another row (3/ft) laid on top of LPSTP (termed Live Siltation).

3. STEP-BY STEPS FOR ACCOTINK CREEK, FT. BELVOIR, VA Toe-down Enhanced LPSTP All drawings by Dave Derrick

4. Typical cross-section for Accotink Creek in the proposed project area ACCOTINK CREEK, FT. BELVOIR, VA LOOKING UPSTREAM

5. Dig toe-down section of LPSTP 3 ft below bed of stream ACCOTINK CREEK, FT. BELVOIR, VA

6. Place Longitudinal Peaked Stone Toe Protection (LPSTP) stone in trench

7. Looking across @ close up of LPSTP stone. CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008

8. ACCOTINK CREEK, FT. BELVOIR, VA Place Joint Planting (live willow poles) on top of stone (angled up at least 20 degrees) at the rate of 3 poles per lineal foot.

9. Looking across @ willow poles on stone. Placing soil on poles. CONSTRUCTION-ACCOTINK CR.-RECHLORINATION- DERRICK 12-2008

10. ACCOTINK CREEK, FT. BELVOIR, VA Place Live Siltation (willow poles) on top of stone at the rate of 3 poles per lineal foot

11. Looking US. LPSTP with joint plantings & Live Siltation in place CONSTRUCTION-ACCOTINK CR.-RECHLORINATION- DERRICK 12-2008

12. ACCOTINK CREEK, FT. BELVOIR, VA At 35 ft spacing intervals, stone Bendway Weirs will be installed that will move the thalweg away from the toe of the LPSTP.

13. LPSTP with Joint Pole Plantings & Live Siltation with an Erosion Control Blanket

14. Cutting coir blanket to length plus close-up. This is a 700 series (700 grams per sq. meter blanket. Heavy& tough. Traps soil & seed well, sticks in dirt when wet, open weave, can be reseeded if needed CONSTRUCTION DELAWARE RIVER-SITE 6-PIX BY DERRICK 9-12-2009

15. ACCOTINK CREEK, FT. BELVOIR, VA Tuck the Erosion Control Blanket (ECB) at base of slope. The ECB used here is a 100% coir (Coconut fiber) Rolanka BioD-Mat 40 Roll ECB out over willows & LPSTP stone.

16. ACCOTINK CREEK, FT. BELVOIR, VA FILL CUT Slope bank. A balanced cut/fill in some sections, heavily eroded areas required soil backfill. Backfill anchors the ECB.

17. Looking US @ erosion control blankets with soil covering the bottom end CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008

18. Looking US @ coir blanket & Bendway Weirs in place. CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008

19. ACCOTINK CREEK, FT. BELVOIR, VA Install rooted stock plants through ECB as appropriate

20. Looking US @ workers installing rooted plants thru ECB. CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008

21. Looking US @ coir blanket, Living Dikes & rooted plants. CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008

22. CONSTRUCTION COMPLETE-Looking US nine months after completion. Most willows browsed by beaver CONSTRUCTION COMPLETE-ACCOTINK CR.-DERRICK 9-13-2009

23. Man’s best friend, Cleophus Speed Elvis Derrick