Attachment 7B - Site Based Stormwater Manamgment Plan by ADG

Jun Of Of OF: a5p

coffey >

Soil Description Explanation Sheet (1 of 2)

DEFINITION:

In angineoring toriris soil includos ovary tyeu of uncumented
or parlidly cemented inorganic or anganic material found in
the graund. In practise, if the matorial can be remouldud or
disintagralod by Hand in its ficld condition or in water it is
described as a soil, Other materials are descrihed using rock
description terme.

CLASSIFICATION SYMBOL & SOIL NAME
Soils aro duseribud in uecordines wilh the Unified Sail
Classification (UCS) a5 shown in le tuble or Sheol 2,

PARTICLE SIZE DESCRIPTIVE TERMS

 

 

 

 

 

 

 

 

 

 

NAME SUBDIVISION SIZE
Boulders 200 mm
Cobbios aU mm to 200 mm

] Gravel : coarse 20mm to comm
medium 6mm to 20mm
fine ?.36 mm io Gimm
Sand coarse G00 pm to 2.36 mm
modium 200 pm to 600 pm
ting 75 km to 200 pm.
MOISTURE CONDITION

Dry Looks and fouls dry. Cohesive and cemented soils
are hard, triuble of powdery. Uncementec! granular
sous run teely through hands.

Moist Soil feels coal and darkened in colour. Cohosive
soils Gan be moulded, Granular soils tend to cohure.

Wet = As for moist but with Irce water lorming on hands:
where handled.

CONSISTENCY OF COHESIVE SOILS

 

 

UNDRAINED
TERM =| STRENGTH FIELD GUIDE
Su (kPa) a

Vary Soft ald A finger can be pushed well inte the
soil wigh little effort.

Soft 12-25 A finger can be pushed into the soll
to about 25mm depth.

Firs 25+ 0 ‘Ife sou can be indented about ymm
with tho thumb, but net panatrated,

Skit 50-100 | The surface of the soil can be
indented with the thumb, but nor
panatrated,

Very Stiff} 100-200 | Thu surfacu of tho soil can be marked,
but not indeed with thumb pressure,

Hard 200 Tho surfseo of Ue soil can be marked
only with the thumbnail.

Crumbles or powers when scraped
by thumonail,

Friablo -

 

 

 

 

 

DENSITY OF GRANULAR SOILS:

 

 

 

 

TERM | __DENSITYINDEX(%) _|
Vary loose Less than 15
Loose 15-36
Medium Dense 35 + 6S
Dense 65 - 85
Very Donso Greater than AS
MINOR COMPONENTS
TERM ASSESSMENT PROPORTION OF
GUIDE MINOR COMPONENT IN:

 

 

Trnce of =| Presence just detectablo] Course grained soils:
by feel or eye. but soil ab”

proporties litUe or na
different lo qunenil Fina grained soils:
properties of primary “1%

componont.

 

With somo] l*resance eanily detacted| Coarse grainon sols!
hy feel or ays, soil 5-12%

prononias litle differant | Fine grained soils;

ta genora! praperias of 15-30%

pamnry component.

 

 

 

 

 

SOIL STRUCTURE
ZONING CEMENTING
Layers Cantinuous acrass | Waukly Pasily proken up by

‘expocure or samplo.| comuniud — hand In air or water.

Lenses Discontinuous Moderately Effort is requirod to
layors of lunticulir | cemented break up the soil by
shapn. hand in air or water,

Pockets [regular inclusions
of different material.

 

 

 

 

GEOLOGICAL ORIGIN

WEATHERED IN PLACE SOILS.

Extramaly Structure and fabric of parent rock visible,
weathered

matarial

Rosidual soil = Struetur and fabric of parant rock not visible,

TRANSPORTED SOILS

Aoollan soil Deposited by wind.

Alluviat soll Daposited by stranms and rivers.

Colluviul suil = Duposiled or slopes (transported downslope
by gravity).

Fill Man rade deposit. Fill may be significantly

 

mora variable between tested lor
naturally occurring suils.

 

Lacustrine soil Deposited by Inkes.

 

Marine soil Deposited in ccean basins, bays, peaches

and estuaries.