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the elevation of the pipe inverts,however one way valves are placed on the pipe ends as an added <br /> precaution. <br /> 1.3 Reference Documents <br /> The following reference documents provide background information and support this CQA manual: <br /> American Society for Testing and Materials (ASTM) Annual Book of ASTM Standards. <br /> Section 4 Construction, Volume 04.02 Concrete and Aggregates. <br /> American Society for Testing and Materials (ASTM) Annual Book of ASTM Standards. <br /> Section 4 Construction, Volume 04.08 Soil and Rock; Dimension Stone; <br /> GEOSYNTHETICS. <br /> American Society for Testing and Materials (ASTM) Annual Book of ASTM Standards. <br /> Section 8 Plastics, Volumes 08.01 Plastics (I), 08.02 Plastics (II), and 08.03 Plastics <br /> (III). <br /> American Association of State Highway and Transportation Officials (AASHTO), <br /> Specifications and Volume II Tests. <br /> Page 2 <br />