My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2007-012A
CBCC
>
Official Documents
>
2000's
>
2007
>
2007-012A
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
4/22/2016 12:10:01 PM
Creation date
9/30/2015 10:29:55 PM
Metadata
Fields
Template:
Official Documents
Official Document Type
Contract
Approved Date
01/09/2007
Control Number
2007-012A
Agenda Item Number
11.1.2
Entity Name
L.H. Tanner
Subject
Contract/Specifications Indian River Drive South Sidewalks
Area
Indian River Drive
Project Number
0201
Bid Number
2007027
Supplemental fields
SmeadsoftID
6066
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
200
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
r <br /> Chapter 4 - Best Management Practices for Erosion and Sediment Control <br /> i Silt fences composed of a wire support fence and an attached synthetic filter fabric slow <br /> the flow rate significantly but have a higher filtering efficiency than burlap . Both woven and <br /> non-woven synthetic fabrics are commercially available . The woven fabrics generally <br /> i display higher strength than the non-woven fabrics . When tested under acid and alkaline <br /> water conditions , most of the woven fabrics increase in strength . There are a variety of <br /> reactions among the non-woven fabrics . The same is true of testing under extensive <br /> i ultraviolet radiation . Permeability rates vary regardless of fabric type . While all of the <br /> fabrics demonstrate very high filtering efficiencies for sandy sediments , there is <br /> considerable variation among both woven and non-woven fabrics when filtering the finer silt <br /> i and clay particles . <br /> Design Criteria <br /> i <br /> 1 . No formal design is required for many small projects and for minor and incidental <br /> applications . For channel flow applications refer to FDOT Standard Index 102 , <br /> i Chart 1 (Plate 4. 066) for guidance on recommended spacing . <br /> 2 . Filter barriers shall have an expected usable life of 3 months . They are applicable <br /> in ditch lines , around drop inlets, and at temporary locations where continuous <br /> construction changes the earth contour and runoff characteristics and where low or <br /> moderate flows (not exceeding 1 cfs) (0 .03 m3 / sec.) are expected . <br /> 3 . Silt fences, because they have much lower permeability than burlap filter barriers, <br /> have their applicability limited to situations in which only sheet or overland flows are <br /> expected . They normally cannot filter the volumes of water generated by channel <br /> flows , and many fabrics do not have sufficient structural strength to support the <br /> weight of water ponded behind the fence line. Their expected usable life is 6 <br /> r months . <br /> Construction Specifications <br /> i <br /> Materials <br /> 1 . Synthetic filter fabric shall be a pervious sheet of propylene , nylon , polyester, or <br /> polyethylene yarn . Synthetic filter fabric shall contain ultraviolet ray inhibitors and <br /> stabilizers to provide a minimum of 6 months of expected usable construction life <br /> r at a temperature range of 0° F to 120° F (- 17C to 49C) . <br /> 2 . Burlap shall be 10 ounces per square yard (340 g/m2) fabric. <br /> i 3 . Posts for silt fences shall be either 4 inch ( 10 cm) diameter wood , or 1 . 33 pounds <br /> per linear foot (2 kg/m) steel with a minimum length of 5 feet ( 1 . 5 m) . Steel posts <br /> shall have projections for fastening wire to them . <br /> 4 . Stakes for filter barriers shall be 1 " x 2" (2 . 5 x 5 cm) wood (preferred) , or equivalent <br /> metal with a minimum length of 3 feet (90 cm). <br /> 4-23 <br />
The URL can be used to link to this page
Your browser does not support the video tag.