<html> <head> <title>Rule 74:56:05:07 Tier 1 action levels -- Criteria for calculation.</title> <META NAME="Keywords" Content="Administrative Rules 74:56:05:07"> <META NAME="Description" Content="Administrative Rules 74:56:05:07 Tier 1 action levels -- Criteria for calculation."> <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>74:56:05:07.&nbsp;&nbsp;Tier 1 action levels -- Criteria for calculation.</b> The department shall calculate Tier 1 action levels shown in Table 1 in this section based on the petroleum contamination in soil leaching to the groundwater pathway, with an excess lifetime cancer risk not exceeding 1:100,000 and a chronic noncancer risk not exceeding a hazard index of one. The department assumes there are receptors actually or potentially ingesting groundwater at the point of maximum soil contamination.</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; Table 1 is as follows:</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <h2><b><font size=3 face="Times New Roman">TABLE 1</font></b></h2> <p align=center><b><font size=3 face="Times New Roman">&nbsp;</font></b></p> <p align=center><b><font size=3 face="Times New Roman">TIER 1 ACTION LEVELS FOR SOILS AT PETROLEUM RELEASE SITES</font></b></p> <p align=center><font size=3 face="Times New Roman">&nbsp;</font></p> <table border=0 cellspacing=0 cellpadding=0> <tr height=38> <td width=235 height=38 valign=top> <h1><b><font size=3 face="Times New Roman">Chemical of Concern</font></b></h1> </td> <td width=239 height=38 valign=top> <p><b><font size=3 face="Times New Roman">Tier 1 Action Level</font></b></p> <p align=center><b><font size=3 face="Times New Roman">(ppm = parts per million)</font></b></p> </td> </tr> <tr> <td width=235 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> </tr> <tr> <td width=235 valign=top> <h3><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Benzene</font></h3> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">0.2 ppm</font></p> </td> </tr> <tr> <td width=235 valign=top> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Toluene</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">15&nbsp;&nbsp;&nbsp; ppm</font></p> </td> </tr> <tr> <td width=235 valign=top> <p align=center><font size=3 face="Times New Roman">Ethylbenzene</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">10&nbsp;&nbsp;&nbsp; ppm</font></p> </td> </tr> <tr> <td width=235 valign=top> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Xylene</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">300&nbsp;&nbsp;&nbsp; ppm</font></p> </td> </tr> <tr> <td width=235 valign=top> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Napthalene</font></p> </td> <td width=239 valign=top> <p><font size=3 face="Times New Roman">25&nbsp;&nbsp;&nbsp; ppm</font></p> </td> </tr> </table> <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> 22 SDR 86, effective December 18, 1995; transferred from §&nbsp;74:03:33:07, July 1, 1996.</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=34A-2-93">34A-2-93</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=34A-2-99">34A-2-99</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=34A-2-101">34A-2-101</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=34A-12-7">34A-12-7.</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=34A-2-99">34A-2-99</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=34A-2-101">34A-2-101</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=34A-12-10">34A-12-10.</A></font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </div> </body> </html>