Additional UST Installation Information

Dry Tank Interstice Monitoring Approvals

Pursuant to various tank manufacturers’ requests, The North Carolina Department of Environmental Quality (NCDEQ) – Underground Storage Tank (UST) Section has reviewed the following proposed double-walled tank interstitial monitoring installation and testing documentation for compliance with the electronic liquid detecting (dry) sensor requirements in 15A NCAC 02N .0901 and .0903.

File Name	Approved
General Industries Dry Tank Approval	12/8/2011
Hall Tank Dry Tank Approval	1/23/2013
Highland Tank Dry Tank Approval (Veeder Root #794380-323 sensor)	1/28/2011
Highland Tank Dry Tank Approval Revised (Veeder Root #794380-333 sensor)	5/27/2014
Modern Welding Dry Tank Approval	1/13/2012
Service Welding Dry Tank Approval	1/15/2014

Tank Interstice Testing Protocols

The following third-party certified tank testing protocols are referenced in the NC DEQ Dry Tank Interstice Monitoring Approvals listed in the above table.

File Name	Revised
Plasteel (Hall Tank) Interstice Test	10/1/2012
Plasteel (Hall Tank) Interstice Test - Updated Table 5 with additional tank sizes	7/20/2022
Highland Tank Interstice Test	5/2/2018
Modern Welding Interstice Test	1/2012
Modern Welding Interstice Test - Additional Approved Tank Sizes	12/2020
Permatank Interstice Test - 2 inch diameter tank interstice riser only	11/22/2013
Permatank Interstice Test - 3 inch or unknown diameter tank interstice riser only	10/8/2020

Tank Interstice Position Sensitive Sensor Installation

The following position sensitive sensor installation procedures are approved for use with tanks referenced in the NC DEQ Dry Tank Interstice Monitoring Approvals listed in the above table.

File Name	Revised
Incon TSP-DMS Sensor Installation	4/2011
Veeder-Root 794380-323 Sensor Installation	1/2013
Veeder-Root 794380-333 Sensor Testing Guidance	1/5/2023