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<br /> Page 2 <br />the elevation of the pipe inverts, however one way valves are placed on the pipe ends as an added <br />precaution. <br /> <br /> <br />1.3 Reference Documents <br /> <br />The following reference documents provide background information and support this CQA manual: <br /> <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.