The document is meant to augment the numerous CQC and CQA guidelines that are presently available for High density polyethylene(HDPE) liner installation and inspection. In general, these documents allow the installer almost complete freedom in making seams with the only conditions being that they pass destructive shear and peel tests to a stipulated strength and selected nondestructive tests. However, there is a long-term concern regarding seam integrity which is not addressed by following this course of action. Simply expressed, it appears as though the long-term service life of some HDPE liners is compromised when seams are made improperly. This comes about by overgrinding, overheating, placing new welds directly over older welds, or simply by poor workmanship. By developing a document somewhere between the typical CQC/CQA document and an installer's training manual, i.e., a 'standard-of-practice', it is hoped that the negative features of seam making can be avoided. It is hoped to provide deeper insight for an inspector as to what the installer is trying to accomplish. At the same time it might be also helpful to the installer in recognizing that others have a vested interest in their specific activity. After some introductory material, the manual is focused toward three types of field seams used for fabricating field seams in HDPE liners: extrusion fillet seams, extrusion flat seams, and hot wedge seams.

Shipping list no.: 89-661-P. "September 1989." Includes bibliographical references (p. 39). "EPA/530/SW-89/069."