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Continued... <br />• Roll #429780-13, Lot # CDE810570: Thickness Measurement AVG = 78 mil <br />• Roll # 429782-13, Lot # CDE810570: Thickness Measurement AVG = 78 mil <br />• Roll # 430103-13, Lot # CDE810570: Thickness Measurement AVG = 78 mil <br />According to Appendix E -Technical Specifications -Section 02776.0 Geomembrane- <br />Typical Properties -Table 2.01-A, Thickness MIN AVG (minimum average roll value) for <br />Smooth or Textured 80 -mil LLDPE is 80 mils. Explanation? <br />Response: <br />The current industry standard specification for the minimum average geomembrane <br />thickness for textured liner is the "nominal thickness-5%"(Geosynthetic Institute GRI Test <br />Method GM 17 Table 2a -Linear Low Density Polyethylene (LLDPE) Geomembrane <br />(TEXTURED). For 80 -mil LLDPE Textured liner, the minimum average thickness is 76 <br />mils. The rolls noted by the Division are within acceptable limits. We have included Table <br />2(a) from the Geosynthetic Institute Test Method GM17 with this response for reference. <br />Amec Foster Wheeler accepts Geosynthetic Institutes Test Method GM17 (as industry <br />standard) and the geomembrane was acceptable for use. Amec Foster Wheeler accepts <br />Geosynthetic Institutes Test Method GM17 (as industry standard) and the geomembrane <br />was accepted for use. <br />Please do not hesitate to contact me at 303-975-2192 or Andrea.Meduna(a�amecfw corn with <br />any questions. <br />Sincerely, <br />Amec Foster Wheeler Environment & Infrastructure, Inc. <br />Andrea L. Meduna, PE <br />Project Manager/Certifying Engineer <br />Attachments: <br />Drawing 6 of 6 Phase 1 Liner 80 -mil DMSM LLDPE Panel Layout Record Drawing <br />Figure 2 Construction & Geomembrane Installation Limits -Rev 1 <br />Appendix M.1 ROC Drawing-Underdrain Ponds GCL Panel Layout Record Drawing -Signed <br />Appendix M.3 ROC Drawing-Underdrain Ponds 80 -mil DSMS LLDPE Panel Layout Record <br />Drawing -Signed <br />GRI Table 1(a)-LLDPE Geomembrane Smooth <br />Amec Foster Wheeler Environment & Infrastructure, Inc. <br />2000 S. Colorado Blvd., Suite 2-1000 <br />Denver, CO 80222 <br />Tel: (303) 935-6505 <br />Fax: (303) 935-6575 <br />amecfw.com <br />Page 4 <br />