2.3.1
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].
2.3.2
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].
2.3.3
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
2.4
pH ADJUSTERS AND SOIL CONDITIONERS
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NOTE: Prior to including these provisions in
project specifications, perform tests of on-site
topsoil to determine its suitability and the
possible need of pH adjusters or soil conditioners.
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Add conditioners to topsoil as required to bring into compliance with
"composition" standard for topsoil as specified herein.
2.4.1
Lime
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NOTE: Use ASTM C 602 calcium carbonate equivalent
(C.C.E.) as specified in Table 1: for burnt lime,
C.C.E. shall not be less than 140 percent; for
hydrated lime, C.C.E. shall not be less than 110
percent; and for limestone, C.C.E. shall not be less
than 80 percent.
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Commercial grade [hydrate] [or] [burnt] limestone containing a calcium
carbonate equivalent (C.C.E.) as specified in ASTM C 602 of not less than
[_____] percent.
SECTION 02923
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