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Organization of This Supplement Standards in this supplement are presented in three parts: (1) Revisions of some water well standards in Bulletin 74-81. (2) Standards for monitoring wells. (3) Updated standards for cathodic protection wells that were originally published in Bulletin 74-1. Selected technical terms used in this supplement are listed and defined in Appendix A. A list of references is contained in Appendix B. Limitations of Standards Well standards contained in Bulletin 74-81 together with well standards in.this supplement (Bulletin 74-90) are recommended minimum statewide standards for the protection of ground water quality. The standards are not necessarily sufficient for local conditions. Local enforcing agencies may need to adopt more stringent standards for local conditions to ensure ground water quality protection. In some cases, it may be necessary for a local enforcing agency to substitute alternate measures or standards to provide protection equal to that otherwise afforded by DWR standards. Such cases arise from practicalities in applying standards,and from variations in geologic and hydrologic conditions. Because it is impractical to prepare"site-specific"standards covering every conceivable case, provision has been made for deviation from the standards. Standards in Bulletin 74-81 and this supplement(Bulletin 74-90)do not ensure proper construction or function of any type of well. Proper well design and construction practices require the use of these standards together with accepted industry practices, regulatory requirements, and consideration of site conditions. It is the ultimate responsibility of the well owner and/or the owner's technical and/or contractor representative(s) to ensure that a well does not constitute a significant pathway for the movement of poor-quahly water,pollutants, or contaminants; does not constitute a public nuisance or hazard and, adequately performs a desired function. The Departmew accepts no responsibility for improper design, construction, alteration,maintenance,function, or destruction of individual wells Applicability Construction standards presented in this supplement apply to all water wells, monitoring wells, and cathodic protection wells constructed after the date of this supplement. Alteration, maintenance, and destruction standards presented in this supplement apply to all water wells, monitoring wells, cathodic protection wells, and "borings"regardless of their original date of construction. Standards contained in Bulletin 74-81 remain in effect except where modified by this supplement (Bulletin 74-90). -6-