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to a transmissivity value of approximately 2x10 "3 m2 /s. Past testing (e.g., Jaisi et al, 2005), <br />shows that at the low normal stress and hydraulic gradient expected, the short -term laboratory <br />transmissivity of various geonet products tested adjacent to a GCL exceeds 2x10 -3 m2 /s, which <br />would meet the installation objectives. Greater flow capacity can be achieved by augmenting the <br />geonet or drainage geocomposite with drainage pipes. The Verwiel et al (2001) case study found <br />that a drainage geocomposite with a transmissivity of 1x104 m2 /s had a high enough flow <br />capacity to handle 8 gpm of groundwater inflow, and that augmenting the drainage net with <br />drainage pipes increased the underdrain flow capacity to more than 60 gpm. <br />If you have any questions, please don't hesitate to contact me at 847 - 851 -1790 or <br />mgold @amcol.com. <br />Sincerely, <br />///I- /W4/X_ <br />Marat Goldenberg, P.E. <br />Technical Support Engineer <br />References <br />1) Christopher, B. and Zhao, A. (2001) "Design Manual for Roadway Geocomposite <br />Underdrain Systems" (http://www.roadrainage.com/ research /designmanual /designmanual- <br />roadway- %20drain.pdfl <br />2) Koerner (2012) "Designing with Geosynthetics ". <br />3) Jaisi, D.P., Glawe, U., and Bergado, D.T. (2005) "Hydraulic Behaviour of Geosynthetic and <br />Granular Landfill Drainage Materials in the Sa Kaeo Landfill, Thailand." Geotextiles and <br />Geomembranes (http: / /www.aseanenvironment .info /Abstract/43005303.pdf). <br />4) Verwiel, M., Thrupp, G., Purdy, S., and Rogers, S. (2001) "Landfill expansion Beneath the <br />Water table in Central Arizona ". Proceedings of Sardinia 2001, 8t' International waste <br />Management and Landfill Symposium. <br />AnAMO*empm <br />