C.
The pumped water shall be filtered through bded straw, a vegelative filte drip or a
vegetated channd to trao sediment occurring as a result of the construction operations. The
vegetated channel shal be constructed such that the discharge flow rate shall not exceed a
velocity of more than 1 foot per second. Accumulated sediment shall be cleered from the
channel periodically.
12. Dust Control
A.
During the progress of the work, the Contractor shal conduct his operations and
maintain the avea of his activities, including sweeoing and sprinkling of streets as
necessary, to minimize creation and dispersion of dust. If the Engineer decides it is
necessary to use cdcium chloride for more effective dust control, the Contractor shall furnish
and spread the materia, as directed. Cacium chloride sndl be as specified under Section 01562,
DUST CONTROL.
Calcium Chloride shall not be used for dust control within a drainage basin or in the vicinity
of any source of potablewater.
13. Separation and Replacement of Topsoil
Topsoil shal be carefully renoved from cross-country areas where excavations are to be made
and separa stored to be used again as directed. The topsoil snd be stored in an area anceptable to
the Engineer and adequate measures shall be enployed to prevent erosion of sad materia.
14. Baed Strav
To trap sediment and to prevent sediment from clogging dranage sysiens, baled straw shall be used
where shown on the drawings. Care shall be taken to keep the bales from breeking apart. The
bales should be securely staked to prevent overturning, flotation, or digolacement. All deposited
sediment shal be renoved periodically. Straw bales shall not be placed within a waterway during
construction of the pipeline crossing.
15. Silt Fence
A.
Where indicated on the drawings or where directed by the Engineer, the Contractor shall erect
and maintain a tenporary silt fence. In areas designated as wetlands, the Contractor
shal line the limits of the construction easement with asilt fence. The silt fence shall be used
specificaly to contain sediment from runoff water and to minimize environmenta danage
Caused by construction.
B. Thesilt fence shal consist of a3-foot wide continuous length sediment control fabric, stitched
to a 22-foot wide, continuous length support netting, and stapled to preweethered oak
posts instaled as shown on the drawings. The oak posts shal be 1 %inches by 1 ’4inches
(Minimum Dimension) by 48 inches and shal be tapered. The support netting shall be
industria strength polypropylene. The bottom edge of the sediment control fabric shal be
buried as shown on the drawings. The sediment control faoric shal conform to the following
properties:
Property Value Test Method
1. Grab Strength (Ibs) 124 ASTM D-4632
01570-5
