<html> <head> <title>Rule 74:02:04:69 Requirements for plugging wells or test holes completed into unconfined aquifers with only one aquifer encountered.</title> <META NAME="Keywords" Content="Administrative Rules 74:02:04:69"> <META NAME="Description" Content="Administrative Rules 74:02:04:69 Requirements for plugging wells or test holes completed into unconfined aquifers with only one aquifer encountered."> <meta name=Generator content="Microsoft Office HTML Filter 2.0"> <meta http-equiv=Content-Type content="text/html; charset=windows-1252"> <meta name=Originator content="Microsoft Word 10"> <style> <!-- --> </style> </head> <body lang=EN-US> <div> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b>74:02:04:69.&nbsp;&nbsp;Requirements for plugging wells or test holes completed into unconfined aquifers with only one aquifer encountered.</b> Wells completed into unconfined aquifers, provided only one aquifer is encountered, may be backfilled with clean sand or gravel to the top of the aquifer. Test holes encountering a single, unconfined aquifer may be backfilled with drill cuttings or clean sand or gravel to the top of the aquifer. Above the aquifer, clay, bentonite grout, or cement grout shall be used for plugging to within at least three feet of the ground surface. If clay is to be used as a backfill material, a minimum of two feet of dry bentonite, bentonite grout, or cement grout must be placed at the top of the aquifer. The top three feet of casing or hole, if not filled with clay, bentonite grout, or cement grout, shall be backfilled with native material. Plugging materials must be added to the well or hole via tremie pipe to any well or test hole less than 16 inches in diameter and to any well or test hole more than 50 feet deep. If it cannot be verified that a well's casing was grouted in accordance with this chapter, an effort must be made to plug the annulus from the bottom of the annulus up to the ground surface with the same type of material or materials required for plugging inside the casing.</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b>Source:</b> 12 SDR 50, effective September 29, 1985; 13 SDR 129, 13 SDR 141, effective July 1, 1987; 18 SDR 224, effective July 16, 1992.</font></p> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b>General Authority:</b> SDCL <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=46-2-5">46-2-5</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=46-6-6.1">46-6-6.1</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=46-6-9">46-6-9</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=46-6-20">46-6-20</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=46-6-27">46-6-27.</A></font></p> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b>Law Implemented:</b> SDCL <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=46-2-9">46-2-9</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=46-6-6.1">46-6-6.1</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=46-6-10">46-6-10</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=46-6-14">46-6-14</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=46-6-18">46-6-18</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=46-6-20">46-6-20</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=46-6-27">46-6-27</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=46-6-28">46-6-28.</A></font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </div> </body> </html>