appendix a condition survey report

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.



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.



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



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.



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


October 2019

FFiigguurreess


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


October 2019

PPhhoottooggrraapphhss


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

appendix a condition survey report

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