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(12/13/2011)Vinoo Jain - RE: FW 'contact info <br /> Pa e 5 <br /> Subject: Re: FW: contact info <br /> Hello Mr. Youngblood, <br /> Yes, I had read that article already and <br /> that is fine and good. However, specifically with your products how much <br /> earthen cover thickness is required to achieve the properties on your <br /> spec sheets? I am interested in Bentofix EX and Bentofix NWL. <br /> CA Title 27 Section 21090(a)(2) states that: <br /> "(2) Low-Hydraulic-Conductivity Layer- In order to protect water <br /> quality by minimizing the generation of leachate and landfill gas, <br /> closed landfills shall be provided with a low-hydraulic-conductivity (or <br /> low through-flow rate) layer consisting of not less than one foot of <br /> soil containing no waste or leachate, that is placed on top of the <br /> foundation layer and compacted to attain an hydraulic conductivity of <br /> either 1x10-6 cm/sec(i.e., 1 ft/yr) or less, or equal to the hydraulic <br /> conductivity of any bottom liner system or underlying natural geologic <br /> materials, whichever is less permeable, or another design which provides <br /> a correspondingly low through-flow rate throughout the post-closure <br /> maintenance period. Hydraulic conductivity determinations for cover <br /> materials shall be as specified in Article 4, Subchapter 2, Chapter 3 of <br /> this subdivision [section 20310 et seq.], but using water as the <br /> permeant, and shall be appended to the closure and post-closure <br /> maintenance report....." <br /> More importantly the immediate question is how thick cover material is <br /> required to achieve equivalent hydraulic conductivity of 1x10-6 cm/sec <br />