2010-07-27_REVISION - M1977223 ‎(21)‎

• Permit No: M1977223
• IBM Index Class Name: REVISION
• Doc Date: 7/27/2010
• Doc Name: Eathwork Construction
• From: JBS Five Rivers Cattle Feeding
• To: DRMS
• Type & Sequence: AM1
• Email Name: MAC
• Media Type: D
• Archive: No

The location and extent of all quarries within the riprap source and all quarry operations shall be subject to
approval. The Engineer reserves the right to change the limits or location of quarries within the riprap source in
order to obtain suitable materials.
The Contractor shall perform all stripping operations and dispose of waste materials as approved by the
Owner /Engineer. Blasting in the quarry shall be so controlled that so far as joint patterns in the quarry will
permit, the rock fragments shall meet gradation requirements specified herein. Unsatisfactory blasting procedures
will not be permitted.
The Contractor shall develop and work the riprap source in a manner to produce sufficient hard, dense, durable
rock fragments reasonably well graded to complete the riprap, as specified herein. The materials for riprap shall
be selected to contain the coarsest and the most hard, dense, and durable fragments from the riprap source.
Methods of sorting and loading material in the quarry shall be such as to produce riprap of the highest practicable
quality and shall be subject to the approval of the Owner /Engineer. Waste materials shall be disposed of in the
exhausted areas of the riprap source or in approved areas adjacent to quarries.
5. Quality
The rock fragments for riprap shall meet the following requirements as to the quality:
1. Individual rock fragments shall be dense, sound, and resistant to abrasion; and shall be free from cracks,
seams and other defects that would tend to increase unduly their destruction by water and frost actions.
6. Gradation
Riprap shall be reasonably well graded within the limits shown below:
Nominal
thickness of
riprap
Maximum size
(Ibs)
Percent by Weight
0 to 10%
less than
60 to
From
700 %o to 40%
To
(inches)
Ibs
ibs
T30
rom
(Ibs bs To
12
300
10
10
(lbs
50 50 I50
18
Notes:
500
15
15
250 50 500
1. Sand and rock dust shall be less than 5 %, by weight, of total riprap material.
2. The percentage of this size material shall not exceed an amount which will fill the voids in larger rock.
7. Installation
Install a nominal thickness of 6 inches of sand /gravel bedding material in the locations designated for riprap. The
sand /gravel bedding material shall be approved prior to installation. The bedding need not be compacted in place,
but shall be placed in such a manner as will result in uniform layers of bedding for riprap of the specified
thickness.
The rock riprap shall be placed by equipment on the surface and to the depth 12 inches thick unless otherwise
specified by the Engineer. It shall be installed to the full course thickness in one operation and in such a manner
as to avoid serous displacement of the underlying material. The riprap need not be compacted, but shall be placed
to grade in a manner to ensure that the larger rock fragments are uniformly distributed and the smaller rock
fragments serve to fill the spaces between the larger rock fragments in such a manner as will result in well- keyed,
densely placed, uniform layers of riprap of the specified thickness. Hand placing will be required only to the
extent necessary to secure the results specified.
313700 -2