Additional Measures To Protect Ground Water From Contamination

01. Notification. An owner, operator, or designee must provide to the Department: (7-1-24) a. Written notice using forms provided by the Department thirty (30) days prior to the installation of a new piping system or a new or replacement UST. (7-1-24) b. Notice twenty-four (24) hours prior to the installation of a replacement piping system. (7-1-24) 02. Requirements for Petroleum UST Systems. Owners, operators, and installers of a new or replacement UST or piping system must comply with the following provisions. (7-1-24) a. Each new or existing UST or piping installed or replaced after February 23, 2007, will have secondary containment and be monitored for leaks in accordance with 40 CFR 280.43(g) if the new or replaced UST or piping is within one thousand (1,000) feet of any existing public drinking water system or any existing potable drinking water well. At a minimum, secondary containment systems must be designed, constructed, and installed to contain regulated substances released from the tank system until they are detected and removed, prevent the release of regulated substances to the environment at any time during the operational life of the UST system, and be checked for evidence of a release at least every thirty (30) days. The following conditions are excluded: (7-1-24) i. Suction piping that meets the provisions of 40 CFR 280.41(b)(1)(ii)(A) through (E); (7-1-24) ii. Piping that manifolds two (2) or more USTs together; (7-1-24) iii. Existing piping to which new piping is connected to install a dispenser; and (7-1-24) iv. Tanks identified in 40 CFR 280.10(b). (7-1-24) b. If the owner installs, within one (1) year, a potable drinking water well at the new facility that is within one thousand (1,000) feet of the USTs, piping, or motor fuel dispenser system as part of the new UST facility installation, secondary containment and under-dispenser containment are required, regardless of whether the well is installed before or after the USTs, piping, and motor fuel dispenser system are installed. (7-1-24) c. The notice described in Subsection 100.01 will indicate whether the new or replacement installation is within one thousand (1,000) feet of an existing public drinking water system or any existing potable drinking water well. If the owner and installer certify that the installation is not within one thousand (1,000) feet of an existing public drinking water system or any existing potable drinking water well, the owner, operator or designee will provide and maintain documentation showing that a reasonable investigation of water systems and drinking water wells was undertaken. A reasonable investigation includes, but is not limited to, a search of the records of: (7-1-24) i. The public or private water service provider in the area which the new or replacement installation is located (if any); (7-1-24) ii. The city or county in which the new or replacement installation is located; (7-1-24) iii. The Idaho Department of Water Resources; and (7-1-24) iv. The Department. (7-1-24) d. In the case of a replacement of an existing UST or existing piping, Section 100 applies only to the specific UST or piping being replaced, not to other USTs and piping. (7-1-24) e. Each installation of a new motor fuel dispenser system will include under-dispenser spill containment if the new dispenser is within one thousand (1,000) feet of any existing public drinking water system or any existing potable drinking water well. (7-1-24) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.07 Department of Environmental Quality Rules Regulating Underground Storage Tank Systems Section 101 Page 6 101. ALTERNATIVE PERIODIC TESTING OF CONTAINMENT SUMPS USED FOR INTERSTITIAL MONITORING OF PIPING. 01. Applicability. (7-1-24) a. The alternative test method in Subsection 101.02 may only be used for containment sumps that are performing continuous interstitial monitoring as a piping release detection method where an electronic sump sensor is installed and connected to an electronic monitoring device, such as an automatic tank gauge, or where the piping within a containment sump is continuous to a containment sump that has an electronic sump sensor installed and connected to an electronic monitoring device, such as an automatic tank gauge. (7-1-24) i. The sump sensor in Subsection 101.01.a. must be positioned in the containment sump according to manufacturer instructions and at the lowest possible point in the containment sump. (7-1-24) ii. The sump sensor in Subsection 101.01.a. must be wired and programmed appropriately to shut down power to the submersible turbine pump (positive shutdown) when the sensor is in contact with liquid in any containment sump. (7-1-24) b. The Department may not allow the alternative test method in Subsection 101.02 if it determines the containment sump, penetration fittings, or containment sump sensors are not constructed or positioned in a manner that will accommodate the alternative testing or prevent releases to the environment (i.e., penetration fittings are too close to the containment sump bottom). (7-1-24) 02. Alternative Test Method Allowed. (7-1-24) a. As an alternative to the allowable test method in 40 CFR 280.35(a)(1)(ii)(A)-(C), containment sumps used for interstitial monitoring of piping may be tested as follows: (7-1-24) i. Temporarily remove any interstitial monitoring containment sump sensors before conducting the test; (7-1-24) ii. Add water to the containment sump up to a point directly beneath the first containment sump penetration fitting from the bottom of the containment sump. The water must be allowed to settle for at least fifteen (15) minutes; (7-1-24) iii. Place a measuring stick that has one sixteenth (1/16th) inch increments into the lowest point in the containment sump and extending above the water level in the sump; and (7-1-24) iv. Document the initial water level measurement as measured from the bottom of the containment sump. After one (1) hour, document the ending water level measurement. If the water level changes less than one eighth (1/8th) inch, the containment sump passes the integrity test. If the water level changes one eighth (1/8th) inch or greater, the containment sump fails the integrity test. (7-1-24) b. Upon completion of the test, remove all water and properly dispose of it. Reinstall any interstitial monitoring sensors. Reinstall all containment sump lids, gaskets, and covers. (7-1-24) 102. -- 199. (RESERVED)