2.2
TOPSOIL
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NOTE: If topsoil properties are included in another
section of Division 2, delete this paragraph and
include a cross-reference to the appropriate
section. Otherwise, select appropriate paragraphs
on topsoil. Check with the local Agriculture County
Extension Service Office for soil properties
appropriate for the plant materials to be planted.
Where suitable topsoil is available within limits of
the work area, stripping and stockpiling of topsoil
should be included in the applicable section of
Division 2 of the specification. If suitable
topsoil is not available within the limits of the
work area, it should generally be the Contractor's
option to either treat the soil of the graded areas
with fertilizer and supplements so as to be
conducive to turf establishment and maintenance, or
to transport topsoil to the project site. Modify pH
range for specified turf and geographical
requirements.
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2.2.1
On-Site Topsoil
Surface soil stripped and stockpiled on site and modified as necessary to
meet the requirements specified for topsoil in paragraph entitled
"Composition." When available topsoil shall be existing surface soil
stripped and stockpiled on-site in accordance with Section [02300
EARTHWORK][02315N EXCAVATION AND FILL].
2.2.2
Off-Site Topsoil
Conform to requirements specified in paragraph entitled "Composition."
Additional topsoil shall be [furnished by the Contractor] [obtained from
topsoil borrow areas indicated].
2.2.3
Composition
Containing from 5 to 10 percent organic matter as determined by the topsoil
composition tests of the Organic Carbon, 6A, Chemical Analysis Method
described in DOA SSIR 42. Maximum particle size, 19 mm 3/4 inch, with
maximum 3 percent retained on 6 mm 1/4 inch screen. The pH shall be tested
in accordance with ASTM D 4972. Topsoil shall be free of sticks, stones,
roots, and other debris and objectionable materials. Other components
shall conform to the following limits:
Silt
[25-50][7 to 17][_____] percent
Clay
[10-30][4 to 12][_____] percent
Sand
[20-35][70 to 82][_____] percent
pH
[5.5 to 7.0][_____]
Soluble Salts
[600] [_____] ppm maximum
2.3
SOIL CONDITIONERS
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NOTE: Prior to including these provisions in
project specifications, perform tests of on-site
SECTION 02921
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