<html> <head> <title>Rule 74:02:04:0H Recommended procedure for chlorine disinfection of water wells.</title> <META NAME="Keywords" Content="Administrative Rules 74:02:04:0H"> <META NAME="Description" Content="Administrative Rules 74:02:04:0H Recommended procedure for chlorine disinfection of water wells."> <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"> <title>DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES</title> <style> <!-- --> </style> </head> <body lang=EN-US> <div> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">RECOMMENDED PROCEDURE FOR CHLORINE</font></p> <p align=center><font size=3 face="Times New Roman">DISINFECTION OF WATER WELLS</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">Chapter 74:02:04</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">APPENDIX H</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">SEE: §</font> <font size=3 face="Times New Roman">74:02:04:58.01</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><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> 18 SDR 224, effective July 16, 1992.</font></p> <font size=3 face="Times New Roman"><br clear=all> </span></font> <p align=center><font size=3 face="Times New Roman">APPENDIX H</font></p> <p align=center><font size=3 face="Times New Roman">(See § 74:02:04:58.01)</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><font size=3 face="Times New Roman">RECOMMENDED PROCEDURE FOR CHLORINE DISINFECTION OF WATER WELLS *</font></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p><b><font size=3 face="Times New Roman">Introduction</font></b></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">A water</font></span><font size=3 face="Times New Roman"> well should be thoroughly cleaned and disinfected with a strong chlorine solution after:</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <table border=0 cellspacing=0 cellpadding=0> <tr> <td width=294 valign=top> <p><font size=3 face="Times New Roman">1.</font> <font size=3 face="Times New Roman">ORIGINAL CONSTRUCTION</font></p> </td> <td width=294 valign=top> <p><font size=3 face="Times New Roman">4.</font> <font size=3 face="Times New Roman">A PERIOD OF NONUSE</font></p> </td> </tr> <tr> <td width=294 valign=top> <p><font size=3 face="Times New Roman">2.</font> <font size=3 face="Times New Roman">ANY REPAIR OR MAINTENANCE</font></p> </td> <td width=294 valign=top> <p><font size=3 face="Times New Roman">5.</font> <font size=3 face="Times New Roman">TWO OR MORE &quot;UNSAFE&quot; WATER</font></p> </td> </tr> <tr> <td width=294 valign=top> <p><font size=3 face="Times New Roman">3.</font> <font size=3 face="Times New Roman">FLOODING</font></p> </td> <td width=294 valign=top> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp; BATERIOLOGICAL SAMPLES</font></p> </td> </tr> <tr> <td width=294 valign=top> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </td> <td width=294 valign=top> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp; ARE TRACED TO THE WELL</font></p> </td> </tr> </table> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">Adequate chlorine requires a certain chlorine dosage for a minimum contact time - 100 parts per million for 2 hours, 50 parts per million for 8 hours, or 25 parts per million for 24 hours.</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">Chlorine for disinfection of water wells can be either 5.25% sodium hypochlorite solution of 65% calcium hypochlorite powder. A 5.25% hypochlorite solution is common household chlorine bleach such as &quot;Hilex,&quot; &quot;Chlorox,&quot; or &quot;Purex&quot; available at grocery stores and supermarkets. The 65% calcium hypochlorite powder is available from chemical supply houses and is known commercially as &quot;HTH,&quot; &quot;Perchloron,&quot; or &quot;Pittchlor.&quot;</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><b><font size=3 face="Times New Roman">Recommended Procedure</font></b></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;1 <font size=2 face=Times>&nbsp;</font>Determine</span> the chlorine dosage for the desired contact time from the following tables:</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p align=center><b><font size=3 face="Times New Roman">AMOUNT OF CHLORINE NECESSARY PER 10 FEET OF WATER IN WELL</font></b></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <p><b><font size=3 face="Times New Roman">5.25% Sodium Hypochlorite (Bleach)</font></b></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <table border=0 cellspacing=0 cellpadding=0> <tr> <td width=161 valign=top> <p><font size=3 face="Times New Roman">Inside Diameter</font></p> </td> <td width=172 valign=top> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </td> <td width=136 valign=top> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </td> <td width=131 valign=top> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </td> </tr> <tr> <td width=161 valign=top> <p><font size=3 face="Times New Roman">of Well</font></p> </td> <td width=172 valign=top> <p><font size=3 face="Times New Roman">100 ppm*</font></p> </td> <td width=136 valign=top> <p><font size=3 face="Times New Roman">50 ppm*</font></p> </td> <td width=131 valign=top> <p><font size=3 face="Times New Roman">25 ppm*</font></p> </td> </tr> <tr> <td width=161 valign=top> <p><font size=3 face="Times New Roman">Casing</font></p> </td> <td width=172 valign=top> <p><font size=3 face="Times New Roman">for 2 hrs</font></p> </td> <td width=136 valign=top> <p><font size=3 face="Times New Roman">for 8 hrs</font></p> </td> <td width=131 valign=top> <p><font size=3 face="Times New Roman">for 24 hrs</font></p> </td> </tr> <tr> <td width=161 valign=top> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </td> <td width=172 valign=top> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </td> <td width=136 valign=top> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </td> <td width=131 valign=top> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </td> </tr> <tr> <td width=161 valign=top> <p><font size=3 face="Times New Roman">1 1/4 inches</font></p> </td> <td width=172 valign=top> <p><font size=3 face="Times New Roman">1/8 fl.oz.</font></p> </td> <td width=136 valign=top> <p><font size=3 face="Times New Roman">----------</font></p> </td> <td width=131 valign=top> <p><font size=3 face="Times New Roman">----------</font></p> </td> </tr> <tr> <td width=161 valign=top> <p><font size=3 face="Times New Roman">2 inches</font></p> </td> <td width=172 valign=top> <p><font size=3 face="Times New Roman">1/2 fl.oz.</font></p> </td> <td width=136 valign=top> <p><font size=3 face="Times New Roman">1/4 fl.oz.</font></p> </td> <td width=131 valign=top> <p><font size=3 face="Times New Roman">1/8 fl.oz.</font></p> </td> </tr> <tr> <td width=161 valign=top> <p><font size=3 face="Times New Roman">3 inches</font></p> </td> <td width=172 valign=top> <p><font size=3 face="Times New Roman">1 fl.oz.</font></p> </td> <td width=136 valign=top> <p><font size=3 face="Times New Roman">1/2 fl.oz.</font></p> </td> <td width=131 valign=top> <p><font size=3 face="Times New Roman">1/4 fl.oz.</font></p> </td> </tr> <tr> <td width=161 valign=top> <p><font size=3 face="Times New Roman">4 inches</font></p> </td> <td width=172 valign=top> <p><font size=3 face="Times New Roman">1 1/2 fl.oz.</font></p> </td> <td width=136 valign=top> <p><font size=3 face="Times New Roman">3/4 fl.oz.</font></p> </td> <td width=131 valign=top> <p><font size=3 face="Times New Roman">3/8 fl.oz.</font></p> </td> </tr> <tr> <td width=161 valign=top> <p><font size=3 face="Times New Roman">6 inches</font></p> </td> <td width=172 valign=top> <p><font size=3 face="Times New Roman">4 fl.oz.</font></span></p> </td> <td width=136 valign=top> <p><font size=3 face="Times New Roman">2 fl.oz.</font></span></p> </td> <td width=131 valign=top> <p><font size=3 face="Times New Roman">1 fl.oz.</font></p> </td> </tr> <tr> <td width=161 valign=top> <p><font size=3 face="Times New Roman">8 inches</font></p> </td> <td width=172 valign=top> <p><font size=3 face="Times New Roman">7 fl.oz.</font></span></p> </td> <td width=136 valign=top> <p><font size=3 face="Times New Roman">3 1/2 fl.oz.</font></span></p> </td> <td width=131 valign=top> <p><font size=3 face="Times New Roman">1 3/4 fl.oz.</font></p> </td> </tr> <tr> <td width=161 valign=top> <p><font size=3 face="Times New Roman">10 inches</font></p> </td> <td width=172 valign=top> <p><font size=3 face="Times New Roman">10 fl.oz.</font></span></p> </td> <td width=136 valign=top> <p><font size=3 face="Times New Roman">5 fl.oz.</font></span></p> </td> <td width=131 valign=top> <p><font size=3 face="Times New Roman">2 fl.oz.</font></span></p> </td> </tr> <tr> <td width=161 valign=top> <p><font size=3 face="Times New Roman">12 inches</font></p> </td> <td width=172 valign=top> <p><font size=3 face="Times New Roman">2 cups</font></p> </td> <td width=136 valign=top> <p><font size=3 face="Times New Roman">1 cup</font></p> </td> <td width=131 valign=top> <p><font size=3 face="Times New Roman">1/2 cup</font></p> </td> </tr> <tr> <td width=161 valign=top> <p><font size=3 face="Times New Roman">18 inches</font></p> </td> <td width=172 valign=top> <p><font size=3 face="Times New Roman">4 1/2 cups</font></p> </td> <td width=136 valign=top> <p><font size=3 face="Times New Roman">2 1/4 cups</font></p> </td> <td width=131 valign=top> <p><font size=3 face="Times New Roman">1 1/8 cups</font></p> </td> </tr> <tr> <td width=161 valign=top> <p><font size=3 face="Times New Roman">24 inches</font></p> </td> <td width=172 valign=top> <p><font size=3 face="Times New Roman">7 1/2 cups</font></p> </td> <td width=136 valign=top> <p><font size=3 face="Times New Roman">3 3/4 cups</font></p> </td> <td width=131 valign=top> <p><font size=3 face="Times New Roman">1 7/8 cups</font></p> </td> </tr> <tr> <td width=161 valign=top> <p><font size=3 face="Times New Roman">36 inches</font></p> </td> <td width=172 valign=top> <p><font size=3 face="Times New Roman">17 1/2 cups</font></p> </td> <td width=136 valign=top> <p><font size=3 face="Times New Roman">8 3/4 cups</font></p> </td> <td width=131 valign=top> <p><font size=3 face="Times New Roman">4 3/8 cups</font></p> </td> </tr> </table> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><b><font size=3 face="Times New Roman">65% Calcium Hypochlorite</font></b></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <table border=0 cellspacing=0 cellpadding=0> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">100 ppm*</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">50 ppm*</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">25 ppm*</font></p> </td> </tr> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">for 2 hrs</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">for 8 hrs</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">for 24 hrs</font></p> </td> </tr> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </td> </tr> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">-----------</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">-----------</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">-----------</font></p> </td> </tr> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">-----------</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">-----------</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">-----------</font></p> </td> </tr> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">-----------</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">-----------</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">-----------</font></p> </td> </tr> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">-----------</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">-----------</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">-----------</font></p> </td> </tr> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">&nbsp; 1/4 oz.</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">1/8 oz.</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">1/16 oz.</font></p> </td> </tr> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">&nbsp; 1/2 oz.</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">1/4 oz.</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">1/8&nbsp; oz.</font></p> </td> </tr> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">&nbsp; 3/4 oz.</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">3/8 oz.</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">1/16 oz.</font></p> </td> </tr> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp; 1 oz.</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">1/2 oz.</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">1/4&nbsp; oz.</font></p> </td> </tr> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">1 1/2 oz.</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">1 1/4 oz.</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">5/7&nbsp; oz.</font></p> </td> </tr> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">4 1/2 oz.</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">2 1/4 oz.</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">1 1/8&nbsp; oz.</font></p> </td> </tr> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">&nbsp;&nbsp; 10 oz.</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">5 oz.</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">1 1/2 oz.</font></p> </td> </tr> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </td> </tr> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">* ppm = parts per million</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">1 heaping tablespoon of 65%</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </td> </tr> <tr> <td width=203 valign=top> <p><font size=3 face="Times New Roman">&nbsp; 8 fluid ounces = 1 cup</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">chlorine powder = 1/2 oz</font></p> </td> <td width=158 valign=top> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </td> </tr> </table> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">2. Prepare a chlorine solution, lift well pump, and pour the chlorine solution into the well.</font></p> <p><font size=3 face="Times New Roman">3. Lower the pump and operate until a chlorine odor is noticed at all discharge points.</font></p> <p><font size=3 face="Times New Roman">4. Leave the chlorine and water solution in the well for the recommended contact time. <b>Do</b> <b>not</b> use the water.</font></p> <p><font size=3 face="Times New Roman">5. At the end of the contact time, pump the well to waste until the chlorine odor cannot be detected. DO NOT ALLOW CHLORINATED WATER TO ENTER A RIVER, LAKE, OR STREAM.</font></p> <p><font size=3 face="Times New Roman">6. Pump the well for a considerable period of time, collect a bacteriological water sample, and submit it for testing.</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face=Symbol>·<font size=1 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </font></span></font><font size=3 face="Times New Roman">Reference - AWWA A 100-90, &quot;AWWA Standard for Water Wells,&quot; January 29, 1990. Published by American Water Works Association, 666 West Quincy, Denver, CO 80235</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <font size=3 face="Times New Roman"><br clear=all> </span></font> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </div> </body> </html>