The foreword to the 1968 edition stated that:
"Whereas the standards in this report are as final as they can be at the present time, the Department will revise them from time to time. We recognize that, as with other published standards, to be effective and useful they must be revised and updated in light of both changes in practice and degree of success achieved in their application."
Sufficient changes in the field of water well construction and experience with applying the 1968 standards warrant revising them. Foremost among the changes in construction practices are:
Other factors include:
These as well as other considerations led to the decision to revise the 1968 edition.
This edition is composed of this chapter, Chapter II, "Standards", and five appendixes.
While there have been a number of modifications and additions to them, the 23 sections of Chapter II, "Standards", are as listed in the 1968 edition. All references to existing laws, standards, and publications have been updated and, where appropriate, additional explanation is provided. Every effort has been made to clarify wording to ensure its understanding. A number of figures illustrating the standards have been included.
Many technical terms concerning groundwater and water well construction are frequently misunderstood or misinterpreted. The term "seal" or "sealing", for example, has several meanings in the jargon of the well driller, geologist, and engineer, depending on what part of the well installation is under discussion. In this report, we have tried to ensure that the technical terms used are understandable.
A list of definitions appears in Appendix A. Certain definitions are made a part of the standards and are presented in Chapter II. Appendix B, Appendix C, and Appendix D describe sealing methods, disinfection, and water quality sampling respectively.
Numerous publications relating to the construction of water wells and to the development, use, and protection of groundwaters have been reviewed in preparation of this report. Included is a considerable body of literature on well construction that has been written since 1968. They are listed in Appendix E in alphabetical order by author.
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