Intro and summary slides (text only) of Lower Duck Pond project fall 2015.

1. Status update on pilot project in Lower Duck Pond, High
Park, Toronto – assessing changes in sediment and water
properties during treatment by WCI Environmental Inc.’s
EOS-2000
Andrew Laursen, Vadim Bostan, Vivian Lam, Ryan Cheung
www.ryerson.ca/water
Twitter@RyUrbanWater
https://www.youtube.com/watch?v=pKFtV7vuhrY

2. SUMMARY
1) DO increased rapidly after initiation of treatment, and has continued to
increase over duration of three month treatment
2) Oxygen saturation (% saturation, based upon temperature) increased
by ~ 45% in < 5 days after initiation of treatment, and remained high
throughout
3) ORP increased sharply after treatment was initiated and remained high
thereafter
4) Aerobic bacteria abundance in sediment (based on heterotrophic plate
counts) increased by 2-3 orders of magnitude. This increase in
abundance followed (with lag) increased oxygen and ORP

3. SUMMARY
• During 3 months of treatment:
 a total of 14.5 – 23 cm of sediment was lost
 These estimates come from total distance from fixed point on shore
(dock) to sediments, and from direct measurement with insertion of
probes (19 locations).
• Initial Sediment Depth (Sept 10) was 183 cm; estimated sediment
volume = 14,823 m3 (based on SA = 0.81 ha)
• Estimate Sediment Loss (fixed point depth) 1,175 m3 – 1,863 m3 (7.9 –
12.6% loss of total sediment volume in 3 months)

4. EOS-2000 Installed at High Park, Toronto