Section 329IAC9-2-1.1. New UST systems within a one (1) year time of travel to a community public water supply well

  1. (a) This section applies to a new UST system that is installed within a one (1) year time of travel (TOT) to a community public water supply system (CPWSS) well as defined in rules of the water pollution control board at 327 IAC 8-4.1-1(5) and where the appropriate person has been provided notice of the establishment of the WPHA as provided in IC 13-18-17-6(d). The one (1) year TOT as defined in rules of the water pollution control board at 327 IAC 8-4.1-1(25) is one (1) of the following:

(1) The one (1) year TOT established as part of a wellhead protection area (WHPA) that is delineated and approved in accordance with rules of the water pollution control board at 327 IAC 8-4.1.

(2) A fixed radius of one thousand five hundred (1,500) feet from the CPWSS well if, at the time of installation of the UST system, there has not been a one (1) year TOT established for that CPWSS as part of a WHPA that is delineated and approved in accordance with rules of the water pollution control board at 327 IAC 8-4.1.

  (b) A new UST system that is installed in a one (1) year TOT under subsection (a) must meet the following requirements:

(1) An underground storage tank that is installed in a one (1) year TOT must be constructed with one (1) of the following secondary containment systems:

(A) A double-walled tank with a monitoring device that:

(i) must be located in the interstitial space between the walls; and

(ii) is installed, calibrated, operated, and maintained in accordance with the manufacturer's instructions, including routine maintenance and service checks for operability or running condition.

(B) A secondary barrier system that meets the following requirements:

(i) The secondary barrier around the underground storage tank consists of artificially constructed material that is sufficiently thick and impermeable (no more than 1 x 10^-6 centimeters per second for water) to direct a release to an observation well and allow its detection.

(ii) The barrier is compatible with the regulated substance stored so that a release from the UST system will not cause a deterioration of the barrier allowing a release to pass through undetected.

(iii) For cathodically protected tanks, the secondary barrier must be installed so that the secondary barrier does not interfere with the proper operation of the cathodic protection system.

(iv) The site is assessed to ensure that the secondary barrier is always above the ground water and not in a twenty-five (25) year flood plain unless the barrier and observation well designs are for use under such conditions.

(v) For a single-walled tank, an observation well that meets the following requirements must be located in the excavation zone of the tank:

(AA) The observation well must be clearly marked and secured to prevent damage and unauthorized access and tampering.

(BB) The slotted portion of the observation 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 accumulated water into the well under both high and low water conditions.

(CC) The observation well must be sealed from the ground surface to the top of the filter pack.

(DD) The continuous monitoring devices or manual methods used can detect the presence of at least one-eighth (⅛) of an inch of free product on top of the accumulated water in the observation well.

(EE) At least one (1) observation well must be placed downgradient of the underground storage tank or at the lowest point of the underground storage tank excavation zone.

(vi) The observation well must be monitored at least one (1) time every thirty (30) days for a release.

(vii) The secondary barrier system is installed, calibrated, operated, and maintained in accordance with the manufacturer's instructions, including routine maintenance and service checks for operability or running condition.

(C) Other methods approved by the commissioner for secondary containment that provide substantially equal environmental protection.

(2) Piping installation in a one (1) year TOT must be constructed with one (1) of the following secondary containment systems:

(A) Double-walled piping with a monitoring device that:

(i) must be located in the interstitial space between the walls; and

(ii) is installed, calibrated, operated, and maintained in accordance with the manufacturer's instructions, including routine maintenance and service checks for operability or running condition.

(B) A secondary barrier system that meets the following requirements:

(i) The secondary barrier around the piping consists of artificially constructed material that is sufficiently thick and impermeable (no more than 1 x 10^-6 centimeters per second for water) to direct a release to an observation well and allow its detection.

(ii) The barrier is compatible with the regulated substance stored so that a release from the UST system will not cause a deterioration of the barrier allowing a release to pass through undetected.

(iii) For cathodically protected piping, the secondary barrier must be installed so that the secondary barrier does not interfere with the proper operation of the cathodic protection system.

(iv) The site is assessed to ensure that the secondary barrier is always above the ground water and not in a twenty-five (25) year flood plain unless the barrier and observation well designs are for use under such conditions.

(v) For single-walled piping, an observation well that meets the following requirements must be located in the excavation zone of the piping:

(AA) The observation well must be clearly marked and secured to prevent damage and unauthorized access and tampering.

(BB) The slotted portion of the observation 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 accumulated water into the well under both high and low water conditions.

(CC) The observation well must be sealed from the ground surface to the top of the filter pack.

(DD) The continuous monitoring devices or manual methods used can detect the presence of at least one-eighth (⅛) of an inch of free product on top of the accumulated water in the observation well.

(EE) At least one (1) observation well must be placed downgradient of the piping or at the lowest point of the piping excavation zone.

(vi) The observation well must be monitored at least one (1) time every thirty (30) days for a release.

(vii) The secondary barrier system is installed, calibrated, operated, and maintained in accordance with the manufacturer's instructions, including routine maintenance and service checks for operability or running condition.

(C) Other methods approved by the commissioner for secondary containment that provide substantially equal environmental protection.

(Solid Waste Management Division; 329 IAC 9-2-1.1; filed Jul 19, 1999, 12:00 p.m.: 22 IR 3698; readopted filed Jan 10, 2001, 3:25 p.m.: 24 IR 1535)