<html> <head> <title>Rule 74:56:01:28 Release detection requirements -- Groundwater monitoring.</title> <META NAME="Keywords" Content="Administrative Rules 74:56:01:28"> <META NAME="Description" Content="Administrative Rules 74:56:01:28 Release detection requirements -- Groundwater monitoring."> <meta http-equiv=Content-Type content="text/html; charset=windows-1252"> <meta name=Generator content="Microsoft Word 15 (filtered)"> <style> <!-- /* Font Definitions */ @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4;} @font-face {font-family:Times; panose-1:2 2 6 3 5 4 5 2 3 4;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0in; margin-bottom:.0001pt; font-size:10.0pt; font-family:"Times",serif; color:black;} a:link, span.MsoHyperlink {color:blue; text-decoration:underline;} a:visited, span.MsoHyperlinkFollowed {color:#954F72; text-decoration:underline;} .MsoChpDefault {font-size:10.0pt; color:black;} @page WordSection1 {size:8.5in 11.0in; margin:1.0in 1.25in 1.0in 1.25in;} div.WordSection1 {page:WordSection1;} --> </style> </head> <body lang=EN-US link=blue vlink="#954F72"> <div class=WordSection1> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b>74:56:01:28.&nbsp;&nbsp;Release detection requirements -- Groundwater monitoring.</b> Testing or monitoring for liquids on the groundwater may be used as a release detection method if the following conditions are met:</span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;</span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (1)&nbsp;&nbsp;The regulated substance stored in the UST system must be immiscible in water and have a specific gravity of less than one;</span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;</span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (2)&nbsp;&nbsp;The groundwater may never be more than 20 feet from the ground surface and the hydraulic conductivity of the soils between the UST system and the monitoring wells or devices may not be less than 0.01 cm/sec. (For example, the soil should consist of gravels, coarse to medium sands, coarse silts, or other permeable materials);</span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;</span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (3)&nbsp;&nbsp;All the monitoring wells or devices must be placed in the backfill or as close to it as technically feasible, and the continuous monitoring devices or manual methods that are used must be able to detect the presence of at least 1/8</span> <span style='font-size:12.0pt;font-family:"Times New Roman",serif'>inch of free product on top of the groundwater in the monitoring wells</span><span style='font-size:12.0pt;font-family:"Times New Roman",serif'>;</span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;</span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (4)&nbsp;&nbsp;The slotted portion of the monitoring well casing must be designed to prevent migration of natural soils or filter pack into the well and to allow entry of regulated substance on the water table into the well under both high and low groundwater conditions;</span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;</span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (5)&nbsp;&nbsp;The monitoring wells must be sealed from the ground surface to the top of the filter pack</span><span style='font-size:12.0pt;font-family:"Times New Roman",serif'>.</span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;</span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Within and immediately below the UST system excavation area, the site shall be assessed before installation of the system to ensure that the number and positioning of the monitoring wells or devices in the excavation area will detect releases from any portion of the UST system. Monitoring wells shall be clearly marked and secured to avoid unauthorized access and tampering.</span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;</span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b>Source:</b> 14 SDR 76, effective November 29, 1987; transferred from &#167;&nbsp;74:03:28:11, 18 SDR 62, effective October 10, 1991; transferred from &#167;&nbsp;74:03:28:11.03, July 1, 1996; 44 SDR 192, effective June 28, 2018.</span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&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></span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b>Law Implemented:</b> SDCL <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=34A-2-98">34A-2-98</A>, <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=34A-2-99">34A-2-99.</A></span></p> <p class=MsoNormal style='text-align:justify'><span style='font-size:12.0pt; font-family:"Times New Roman",serif'>&nbsp;</span></p> </div> </body> </html>