City of Winnipeg Section 32 91 19.13 Design and Construction of the Public Works East Yard TOPSOIL PLACEMENT AND GRADING Complex at the Former Elmwood/Nairn Landfill Site Page 1 RFP 429-2011

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City of Winnipeg

Section
32

91 19.13

Design and Construction of the Public Works East Yar
d

TOPSOIL PLACEMENT AND GRADING

Complex at the Former Elmwood/Nairn Landfill Site

Page
1

RFP 429
-
2011







PART 1

-

GENERAL



1.1

DESCRIPTION



.1

This Section outlines requirements for topsoil, topsoil amendments,
and growing medium, as well as the stripping of topsoil, should viable
topsoil exist on site; the preparation of existing grades, placing of
topsoil and

finish grading.

1.2

SITE MATERIAL





.1

Ensure that suitability and usefulness of on
-
site material is checked
and verified by a certified professional or Soil Testing Laboratory.

1.3 REFERENCES AND

RELATED SECTIONS








.1

City of Winnipeg Standard Co
nstruction Specifications:


.1

CW 3170


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-

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-

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-

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-

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City of Winnipeg

Section
32

91 19.13

Design and Construction of the Public Works East Yar
d

TOPSOIL PLACEMENT AND GRADING

Complex at the Former Elmwood/Nairn Landfill Site

Page
2

RFP 429
-
2011




2.2

GROWING MEDIUM



.1

Peat moss

and sand constituents of Growing Medium for areas to
receive Legume and Grass Seed Mixture: as per CW 3540.


.2

Compost shall be
unrestricted grade
: includes yard, agricultural and
silvicultural wastes plus untreated wood products that have been
treated b
y pathogen
-
free requirement procedures (PFRP), that is,
maintained at 131°F (55°C) for 48 to 96 hours. This treatment ensures
that the compost is free of disease
-
causing organisms.


2.3 SOIL AMENDMENTS




2.4 MULCH


.1

Contractor is responsible for amendme
nts to supply topsoil as
specified.

.2

Soil testing by recognized testing facility for PH, P and K, and organic
matter.

.1

Mulch shall be clean river run stone, 20mm to 30mm.


PART 3

-

EXECUTION



3.1 TEMPORARY EROSION AND

SEDIMENTATION CONTROL






.1

Provide te
mporary erosion and sedimentation control measures to
prevent soil erosion and discharge of soil
-
bearing water runoff or
airborne dust to adjacent properties and walkways, according to
sediment and erosion control plan, specific to site, that complies with

EPA 832/R
-
92
-
005 or requirements of authorities having jurisdiction,
whichever is more stringent.

.2

Inspect, repair, and maintain erosion and sedimentation control
measures during construction until permanent vegetation has been
established.

.3

Remove erosio
n and sedimentation controls and restore and stabilize
areas disturbed during removal.


3.2

STRIPPING OF TOPSOIL





.1

As per CW 3540

.2

Strip topsoil to depths as determined by localized soil depth and
chemistry testing.

3.3 PREPARATION OF

EXISTING GRADE






.1

Prepare existing grade in accordance with Section G1030


Site
Earthwork.

3.4 PLACING AND

SPREADING OF

TOPSOIL/PLANTING

SOIL



.1

Place and spread topsoil in accordance with CW 3540.

.2

For sod areas: spread topsoil to a minimum depth after settlement of
100 mm.



City of Winnipeg

Section
32

91 19.13

Design and Construction of the Public Works East Yar
d

TOPSOIL PLACEMENT AND GRADING

Complex at the Former Elmwood/Nairn Landfill Site

Page
3

RFP 429
-
2011





.3

For planting beds: spread planting soil mixture to a minimum depth
after settlement of 300 mm.

.4

For infiltration trenches spread minimum of 750 mm of prepared
planting medium.

.5

Manually spread topsoil/planting soil around trees, shrubs and

obstacles.


3.5

SOIL AMENDMENTS



.1

For sod and seeded grass areas: apply and thoroughly mix soil
amendments as recommended by soil test results into top 50mm of
existing soil:

.2

For planting beds and infiltration trenches: apply and thoroughly mix
soi
l amendments as recommended by soil test results into full specified
depth of soil mixture.

3.6

GROWING MEDIUM


3.7 VEGETATED INFILTRATION
TRENCHES






3.8 FINISH GRADING






.1

For areas to receive Legume and Grass Seed Mixture: mix 35 mm peat
moss and

15 mm sand into the top 75 mm of clean clay cover,
following construction of rough grades.


.1

Prepared planting medium for vegetated infiltration trenches: shall
include a mixture of 30% topsoil, 50% sand and 20% compost


.2

Gravel underdrain blanket:
for the entire width of the infiltration swale
shall extend 300 mm from minimum the 200 mm perforated sub
-
drain
discharge pipe connected to the on
-
site stormwater system.


.3

Filter fabric: shall be installed between prepared planting medium and
gravel un
derdrain blanket.


.4

Install river
-
run stone to 50mm depth around all plantings.



.1

Finish grading as per CW 3540.


3.9 ACCEPTANCE






.1

Test topsoil for NPK to determine fertilizer requirements and
application rates.


3.10 SURPLUS MATERIAL






.1

Dispose of materials, except imported topsoil not required, off site.


3.11
CLEANING






.1

Proceed in accordance with Section 01 74 11


Cleaning.