HomeMy WebLinkAbout1902824240001-08142014SPECIFICATIONS FOR SOIL I CLIENT:
AMENDEMENT BY SOIL RIPPING CITY HOMES
DESIGN + BUILD, LLC
SOIL AMENDMENT BY SOIL RIPPING TO RELIEVE COMPACTION:
o)Ripping (Subsoiling) should be performed using a
solid—shank ripper and to a depth of 18 inches as
measured from the top of topsoil.
b)The goal of soil ripping or subsoiling is to fracture
compacted soil without adversely disturbing plant life, topsoil,
and surface residue. Soil compaction occurs most frequently
with soils having a high cloy content. Fracturing
compactedsoil promotes root penetration by reducing soil
density and strength, improving moisture infiltration and
retention, and increasing air spaces in the soil. Compacted
layers typically develop 12 to 22 inches below the surface
when heavy equipment is used.
c)Subsoilers (rippers) can break up the compacted layer
without destroying soil aggregate structure, surface
vegetation, or mixing soil layers (Kees, 2008). How
effectively compacted layers are fractured depends on the
soil's moisture, structure, texture, type, composition,
porosity, density, and clay content. Success depends on the
type of equipment selected, its configuration, and the speed
with which it is pulled through the ground. No one piece of
equipment or configuration works best for all situations and
soil conditions, making it difficult to define exact
specifications for subsoiling equipment and operation.
d)Subsoilers are available with a wide variety of shank
designs. Shank design offects subsoiler performance, shank
strength, surface and residue disturbance, effectiveness in
fracturing soil, and the horsepower required to pull the
subsoiler. According to Kees (2008), "Parabolic shanks
require the least amount of horsepower to pull. In some
forest applications, parabolic shanks may lift too many
stumps and rocks, disturb surface materials, or expose
excess subsoil. Swept shanks tend to push materials into
the soil and sever them.
e)Ripping, subsoiling, or scarification of the subsoil should be
performed where subsoil has become compacted by
equipment operation, dried out and crusted, or where
necessary to obliterate erosion rills.
CONSTRUCTION SEQUENCE:
a)Subsoil ripping, or scarification of the subsoil will be
required wherever the subsoil has been compacted by
equipment operation or has become dried out and crusted,
and where necessary to obliterate erosion rills. Sub—soiling
shall be completed in areas as indicated on the pion where
plant establishment or grass turf is planned.
b)Install perimeter, and/or down gradient, erosion control
BMP's prior to any upslope land disturbance.
c)Rough grading of the project should be complete and
measured implemented to protect the soil ripping area from
experiencing further compaction by heavy equipment.
d)Existing topsoil shall be stripped from the area of soil
ripping work. Topsoil shall be stockpiled and temporary
erosion control measures shall be implemented as required
for the stockpile.
e)The subsoil shall be in a relatively dry, friable condition to
a depth of 18 inches below final topsoil grade.
f) Ripping channels shall be created by a commercially
available, multi—shanked, parallelogram implement
(solid—shank ripper or equivalent equipment). The
equipment shall be capable of exerting a penetration force
necessary for the site. The grid channels shall be spaced
a minimum of 12 inches to a maximum of 36 inches
apart. The channel depth shall be a minimum of 18
inches.
g)Sub—soiling shall be completed such that ripping channels
result in a two—directionol grid.
h)Topsoil shall be re—spread over the soil ripping subsoil area
at a minimum 6" depth.
i) Final grade of the soil ripping area shall be achieved by
use of light equipment with tracks or turf type tires.
Equipment with high pressure narrow tires or large lugs will
cause excessive compaction.
4220 Crocker Ave
Edina, MN 55416
952-920-8250
f) Subsoiling should not be performed within the drip line of
any existing trees, over underground utility installations within
30 inches of the surface, where trenching/drainage lines
j) Permanent ground cover turf shop be established by sod or
seed with established growth before perimeter erosion
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are installed, where compaction is by design.
control BMP's are removed. Erosion control BMP's are to
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be removed once final stabilization is achieved.
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g)Subsoiling is only effective when performed on dry soils. If
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soils are saturated, the Contractor shall delay operations
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until the soil will not hold a boll when squeezed. Only one
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pass shall be performed on erodible slopes greater than 1
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vertical to 3 horizontal. When only one pass is used, work
should be at right angles to the direction of surface
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drainage, whenever practical.
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