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REVISIONS TO WATER WELL STANDARDS <br /> INTRODUCTION <br /> Revisions to standards in DWR Bulletin 74-81, Chapter II, are presented in this section. All standards in <br /> Bulletin 74-81 that are not revised by this supplement (Bulletin 74-90) remain unchanged and in effect. The <br /> organization and numbering system used for the revisions is the same as that in Bulletin 74-81. <br /> Table 1,page 10,below,lists portions of Bulletin 74-81 that are replaced by this supplement (Bulletin 74-90). <br /> The user of this supplement should strike-out the replaced sections and paragraphs in the copy of Bulletin <br /> 74-81 that is enclosed in the back cover of this supplement. <br /> 9- <br />