APPENDIX A
CONDITION SURVEY REPORT
INSPECTION OF WATER CONTROL STRUCTURE
DEER CREEK DAM
LANGTON, ONTARIO
Prepared for:
Long Point Region Conservation Authority
Prepared by:
WATECH SERVICES INC.
895 Valetta Street
London, Ontario
N6H 2Z4
October 2019 WSI 19191
TABLE OF CONTENTS
Page
1. INTRODUCTION ......................................................................................... 1
2. INSPECTION PROCEDURES ....................................................................... 2 2.1. General ............................................................................................ 2
3. OBSERVATIONS AND INSPECTION RESULTS ............................................. 3 3.1 East Wingwall .................................................................................. 3 3.2 West Wingwall ................................................................................. 3 3.3 Spillway ............................................................................................ 4
4. RECOMMENDATIONS ............................................................................... 5
Figure
Photographs
Video
Deer Creek Dam Inspection, Langton, Ontario Page 1
Long Point Region Conservation Authority Watech Services Inc.
1. INTRODUCTION
WATECH SERVICES INC. was retained by the Long Point Region Conservation Authority to carry out an inspection of the upstream portion of the water control structure known as the Deer Creek Dam near Langton, Ontario. The focus of the inspection was the condition of the upstream wingwalls of the dam structure.
The report details the results of our inspection findings and may be used as baseline reference and background information for future inspection and maintenance programs and to assist in future repair and modification work.
Deer Creek Dam Inspection, Langton, Ontario Page 2
Long Point Region Conservation Authority Watech Services Inc.
2. INSPECTION PROCEDURES
2.1. General
Inspection Team: 3 person crew Location: Deer Creek Dam, Langton, Ontario Date: October 21, 2019 Weather: Sunny, 15oC
The field inspection work was carried out by a WATECH SERVICES INC. inspection team on October 21, 2019.
The underwater inspections were carried out by a diver using surface supplied air diving equipment on the upstream side of the dam structure. Water clarity at the time of the inspection was good and underwater photographs were successfully obtained.
The underwater portions of the dam structure wingwalls and upstream sill face were inspected visually and tactilely by the diver. The diver also completed concrete hammer soundings periodically and in any areas of concern. The inspection diver was in constant communication with the surface personnel relaying the results of the investigation.
Above and below water photographs where collected to document general and specific structure conditions and are presented following the text of this report.
Water depth soundings were obtained and documented at selected locations to detail present conditions.
Deer Creek Dam Inspection, Langton, Ontario Page 3
Long Point Region Conservation Authority Watech Services Inc.
3. OBSERVATIONS AND INSPECTION RESULTS
The Deer Creek Dam consists of a single discharge overflow spillway. A low flow valve chamber and outlet is located some distance away from the main overflow spillway. The function of the dam is to provide an essentially stable water level for recreational use on the head pond created by the dam. The conservation area created by the dam is used for day use and overnight camping
Downstream of the dam the discharge creek is relatively small and passess through a wooded area.
Access to the dam is restricted by fencing at each end of the concrete deck and on the wingwalls. The fencing is in good condition and is securely mounted to the concrete.
The results of the inspection are shown below under the appropriate section headings. The water depth soundings obtained are shown on Figure 1.
3.1 East Wingwall
The East wingwall above the water level for the most part is in relatively good condition. Most of the deterioration of the wall occurs in the water level splash zone and below the water level. The deterioration consist of delamination and spalling of the concrete surface.
The east end of the east wingwall has completely spalled and eroded away leaving only the original steel reinforcing in place (see Photographs 1 and 2). The remainder of the deterioration consists of delamination and spalling of the concrete surface and loss of a few centimeters of the concrete face (see photographs). The surface does not appear in the remaining areas to have spalled and eroded back to the outside re-inforcing steel layer.
3.2 West Wingwall
The west wingwall above the water level for the most part is in relatively good condition. The west wingwall is in slightly better condition than the east wingwall. Again the deterioration of the wall occurs in the water level splash
Deer Creek Dam Inspection, Langton, Ontario Page 4
Long Point Region Conservation Authority Watech Services Inc.
zone and below the water level. The deterioration consist of delamination and spalling of the concrete surface.
The end of the west wingwall remains relatively intact and no significant areas of exposed steel reinforcing were noted. The deterioration again consists of delamination and spalling of the concrete surface and loss of a few centimeters of the concrete face (see photographs).
3.3 Spillway
The vertical wall of the spillway was examined below the water level. The wall appears in generally good condition. The wall is free of significant cracks, spalls and erosion of the concrete surface (see underwater photographs) Light algae covers the concrete surface completely bewlow the water level.
Looking downstream along the spillway the concrete surface looks to be in good condition although it was not thoroughly examined by this inspection.
Deer Creek Dam Inspection, Langton, Ontario Page 5
Long Point Region Conservation Authority Watech Services Inc.
4. RECOMMENDATIONS
The Deer Creek Dam is in generally good condition with the exception of the wingwalls. The following recommendations are offered to restore the wingwalls.
• Chip and remove loose concrete in the spalled and eroded areas (approx.
15m2)
• Install dowels and re-inforcing.
• Install light guage steel sheet pile form in lower portion of wingwall. Sheet pile
should extend approximately 300mm above the present water level to
encompass all of the presently spalled concrete and areas that may
potentially spall in the future.
The area to be repaired is approximately 55m2. This is the total area of sheeting that would be required to complete the encapsulation of the lower 1.5 metres of both wingwalls. The area that is actually delaminated and spalled at this point would be approximately one third of the total area that needs to be repaired. Some of the concrete remains in place; however sounds delaminated upon hammering. As a result it is our opinion the entire lower portion of each wingwall be repaired.
Prior to completing the repair work it may be prudent to obtain some concrete core samples from the wingwalls. It is unusual that the deterioration is so severe at the water level and the remainder of the walls appear in such good condition. The core sample concrete should by tested for compressive strength and the level of air entrainment to determine if the concrete has a quality issue that would suggest a more extensive repair be undertaken.
INSPECTION OF DEER CREEK DAM
Deer Creek Conservation Area
Langton, Ontario
Long Point Region Conservation Authority
October 2019
FFiigguurreess
WATECH SERVICES INC.
WSI 19191
EAST WINGWALL
BOTTOMWATER LINE
FENCE
WEST WINGWALL
BOTTOM
1.0
TIGHT CRACKING
SPALLED CONCRETE
FENCE
WATER LINE
TIGHT CRACKINGTIGHTCRACKING
SPALLEDCONCRETE
0.53.5
1.0
1.0
0.5
EXPOSEDREBAR
DEER CREEK DAM
FIGURE 1WINGWALLS
19191OCTOBER 2019
N
1. THE INSPECTION WAS COMPLETED ON OCTOBER 21, 2019
2. ALL MEASUREMENTS ARE SHOWN IN METRES UNLESS OTHERWISE NOTED
3. DAM AND BRIDGE DIMENSIONS SHOWN AS PER CONSTRUCTION DRAWINGS
NOTES
DAM INSPECTION
LEGEND
COLD JOINT
CRACKING
CRAZED / TIGHTCRACKING
SPALLING /CONCRETE LOSS
LPRCA
FIGURE 2SOUNDINGS
19191OCTOBER 2019
N1. THE INSPECTION WAS COMPLETED ON OCTOBER 21, 2019
2. ALL MEASUREMENTS ARE SHOWN IN METRES UNLESS OTHERWISE NOTED
3. WATER LEVEL WAS 50mm ABOVE THE SILL ELEVATION AT THE TIME OF THE INSPECTION
NOTES
DEER CREEK DAM
1.55
1.70
1.90
1.80
2.20
1.55
1.75
1.20
1.80
1.80
2.20
1.60
1.80
0.65
1.75
1.65
0.70
SOUNDINGS
1.55
SLOPING SILL
LOGSTOPS
15.3
10.9
11.0
WATER DEPTH TYP.
INSPECTION OF DEER CREEK DAM
Deer Creek Conservation Area
Langton, Ontario
Long Point Region Conservation Authority
October 2019
PPhhoottooggrraapphhss
WATECH SERVICES INC.
WSI 19191
PHOTO # 1
East face of east wingwall
PHOTO # 2
West face of east wingwall
PHOTO # 3
West wingwall 1/3 from nose
PHOTO # 4
West wingwall
PHOTO # 5
East wingwall
PHOTO # 6
Spalling of concrete along east wingwall at wall deflection
PHOTO # 7
Spalled concrete from preceding photograph at a closer magnification, dimensioned 12' long by 2' high by 3.5" deep
PHOTO # 8
Typical erosion of concrete along the east wingwall at the splash zone
PHOTO # 9
Further along the eroding concrete at the splash zone, continuing from the preceding photograph
PHOTO # 10
Overall view of the concrete erosion along the bottom of the east wingwall
PHOTO # 11
Overall east face of the west wingwall
PHOTO # 12
East face of west wingwall
PHOTO # 13
Overall spillway from east to west
PHOTO # 14
Downwards view of the spillway
PHOTO # 15
Downwards view of spillway
PHOTO # 16
Cross view of the spillway from west to east
PHOTO # 17
Overall photograph of the west face of the east wingwall
PHOTO # 18
Continuation of the west face of the east wingwall
PHOTO # 19
Spalled concrete on east face of the west wingwall at the deflection
PHOTO # 20
Spalled concrete on the west wingwall dimensioned 1m long by 0.5m high by 0.05m deep
PHOTO # 21
Spalling of concrete from nose to 1/3 of the way down the west wingwall
PHOTO # 22
Spalling of concrete from 1/3 of the way down the west wingwall to the point of deflection
PHOTO # 23
Spalling of concrete from point of deflection to spillway
PHOTO # 24
Typical spalling of concrete along the splash zone
PHOTO # 25
Nose of the west wingwall
PHOTO # 26
West face of the west wingwall
PHOTO # 27
Overall photo of the dam from north to south
PHOTO # 28
West face of the west wingwall
PHOTO # 29
Offshore nose of the west wingwall
PHOTO # 30
Front view of offshore nose of the west wingwall
PHOTO # 31
East face of west wingwall near the offshore end
PHOTO # 32
Typical concrete along the west wingwall
PHOTO # 33
East face of west wingwall
PHOTO # 34
Bottom center of west wingwall typical condition
PHOTO # 35
East face of west wingwall, 3/4 from the nose. Concrete is in typical condition
PHOTO # 36
Spalling of concrete located at the inshore end of the west wingwall, dimensioned 0.5m by 0.5m by 0.05m deep
PHOTO # 37
Spalling of concrete on the inshore end of the west wingwall. Majority of damage is located above water
PHOTO # 38
Transition area between the west wingwall and the sill
PHOTO # 39
Typical photo of the west side of the sill
PHOTO # 40
Typical concrete along the west side of the sill
PHOTO # 41
Typical view of the sill
PHOTO # 42
Midpoint of the spillway at the transition point between the concrete and the lake bottom
PHOTO # 43
Edge of spillway in typical condition
PHOTO # 44
Typical transition between the sill and the lake bottom
PHOTO # 45
Typical concrete condition on the sill
PHOTO # 46
Transition area between the sill and the west face of the east wingwall
PHOTO # 47
Damaged concrete along the deflection of the east wingwall, dimensioned 3.66m long by 0.61m high by 0.08m deep
PHOTO # 48
Exposed rebar at the deflection point of the east wingwall
PHOTO # 49
Transition point between the lake bottom and the wall transition, on the west face of the east wingwall
PHOTO # 50
Concrete in typical condition on the west face of the east wingwall
PHOTO # 51
Typical bottom transition on the west face of the east wingwall
PHOTO # 52
Continuation of the bottom transition on the west face of the east wingwall
PHOTO # 53
Heavy erosion on the nose of the east wingwall. Majority of erosion is located above water
PHOTO # 54
Heavy erosion on the nose of the east wingwall, continuing from the preceding photograph
PHOTO # 55
Heavy erosion on the nose of the east wingwall at a closer magnification
PHOTO # 56
Heavy erosion on the nose of the east wingwall
PHOTO # 57
Overall east face of the east wingwall
APPENDIX B
ONTARIO NATIVE ROADSIDE SEED MIX
Ontario Native Roadside MixDescriptionA robust seed mix designed for single pass application to establish a native meadow suitable for the general road side environment in Southern Ontario. Application of this native seed mix for con-servation is appropriate in Seed Zone 34, 37 & 38. The vegetation mix is quick to establish and will succeed to later successionalspecies that will provide good erosion control, having gooddrought and salt tolerance. The mix includes a quick establishing grass combined with attractive persistent native grasses and wildflowers once common throughout this regionof Ontario.
ApplicationFor all roadside areas including uplands, slopes, and lower ditched (periodically wet) areas as a single mix.
Prices and components are subject to change without notice.Please call for pricing and availability.
To order, please call toll-free 1 866 640 8733 or email [email protected]
www.stwilliamsnursery.com
Application Rate20kg/hectare
MaintenanceWell adapted for occasional mowing, or can be left alone for a more natural appearance; periodic mowing once everycouple of years, in early to mid summer, can help to rejuventate native meadow if burning is not possible, but may only be necessary if weedy or shrubby species become a problem.
Can be established by hydroseeding, drilling or broadcast application; seed should be on the surface with good seed soil contact for best results. Spring or Fall seeding recommended.
Common Name Scientific Name Quantity/Hect-are (kg PLS*)
% Mix by
Weight
Zone 34
Zone 37
Zone 38
GrassesBig Bluestem Andropogon gerardii 2.00 10.00 x x xCanada Wild Rye Elymus canadensis 1.00 5.00 x x xSlender Wheatgrass Elymus trachycaulus 0.50 2.50 x x xVirginia Wild Rye Elymus virginicus 1.00 5.00 x x xSwitch Grass Panicum virgatum 2.00 10.00 x x xLittle Bluestem Schizachyrium scoparium 1.00 5.00 x x xIndian Grass (savanna) Sorghastrum nutans 1.00 5.00 x x xSand Dropseed Sporobolus cryptandrus 0.55 2.75 x x xAnnual Ryegrass Lolium multiflorum 10.00 50.00 x x x
Subtotal Grasses 19.05Sedges and other gram-inoidsGrain Sedge Carex granularis 0.05 0.25 x x xFox Sedge Carex vulpinoidea 0.05 0.25 x x xDark Green Bulrush Scirpus atrovirens 0.05 0.25 x x xWool-grass Scirpus cyperinus 0.05 0.25 x x x
Subtotal Sedges & Other graminoids
0.20
ForbsShowy Tick Trefoil Desmodium canadense 0.10 0.50 x x xSweet Ox-eye Heliopsis helianthoides 0.10 0.50 x x xRound-headed Bushclover Lespedeza capitata 0.10 0.50 x x xWild Bergamot Monarda fistulosa 0.02 0.10 x x xEvening Primrose Oenothera biennis 0.10 0.50 x x xTall Cinquefoil Potentilla arguta 0.05 0.25 x x xBrown-eyed Susan Rudbeckia hirta 0.10 0.50 x x xEarly Goldenrod** Solidago juncea 0.01 0.05 x x xGrey Goldenrod** Solidago nemoralisHeath Aster*** Symphyotrichum ericoides 0.01 0.05 x x xNew England Aster*** Symphyotrichum novae-an-
gliaex x x
Sky Blue Aster*** Symphyotrichum oolentang-iense
0.01 0.05 x x x
Frost Aster*** Symphyotrichum pilosum x x xBlue Vervain Verbena hastata 0.10 0.50 x x xHoary Vervain Verbena stricta 0.05 0.25 x xFoxglove Beardtongue Penstemon digitalis 0.05 0.25 x
Subtotal Forbs 0.75 3.75
* Pure Live Seed** Goldenrod species may be a mix of all Goldenrod species listed*** Asters may be a mix of all Aster species listed
Ontario Native Roadside Seed Mix
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