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*When installing geotextiles an overlap of 150 - 300 mm should be used.
 
*When installing geotextiles an overlap of 150 - 300 mm should be used.
 
Material specifications should conform to OPSS 1860 for Class II geotextile fabrics
 
Material specifications should conform to OPSS 1860 for Class II geotextile fabrics
<ref>ONTARIO PROVINCIAL STANDARD SPECIFICATION METRIC OPSS 1860 MATERIAL SPECIFICATION FOR GEOTEXTILES. 2012. http://www.raqsb.mto.gov.on.ca/techpubs/OPS.nsf/0/2ccb9847eb6c56738525808200628de1/$FILE/OPSS%201860%20Apr12.pdf. Accessed July 17, 2017</ref>. Note when expansive clays are present, a non-infiltrating design may be necessary.  If used, geotextile socks around perforated pipes should conform to ASTM D6707 with minimum water flow rate conforming to ASTM D4491 (12,263 L/min/m2 at 5 cm head).   
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<ref>ONTARIO PROVINCIAL STANDARD SPECIFICATION METRIC OPSS 1860 MATERIAL SPECIFICATION FOR GEOTEXTILES. 2012. http://www.raqsb.mto.gov.on.ca/techpubs/OPS.nsf/0/2ccb9847eb6c56738525808200628de1/$FILE/OPSS%201860%20Apr12.pdf. Accessed July 17, 2017</ref>. Note when expansive clays are present, a non-infiltrating design may be necessary.  If used, geotextile socks around perforated pipes should conform to ASTM D6707 with minimum water flow rate conforming to ASTM D4491 (12,263 L/min/m<sup>2</sup> at 5 cm head).   
 
*Fabrics should be woven monofilament or non-woven needle punched.  
 
*Fabrics should be woven monofilament or non-woven needle punched.  
 
*Woven slit film and non-woven heat bonded fabrics should not be used, as they are prone to clogging.
 
*Woven slit film and non-woven heat bonded fabrics should not be used, as they are prone to clogging.

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