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 NameApprovedPDF
General Industries Dry Tank Approval12/8/2011PDF
Plasteel Dry Tank Approval1/23/2013PDF
Highland Tank Dry Tank Approval (Veeder Root #794380-323 sensor)1/28/2011PDF
Highland Tank Dry Tank Approval Revised (Veeder Root #794380-333 sensor)5/27/2014PDF
Modern Welding Dry Tank Approval1/13/2012PDF
Service Welding Dry Tank Approval1/15/2014PDF

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 NameRevisedPDF
Plasteel Interstice Test8/19/2024PDF
Highland Tank Interstice Test3/21/2023PDF
Modern Welding Interstice Test1/2012PDF
Modern Welding Interstice Test - Additional Approved Tank Sizes10/30/2024PDF
Permatank Interstice Test - 2 inch diameter tank interstice riser only11/22/2013PDF
Permatank Interstice Test - 3 inch or unknown diameter tank interstice riser only10/8/2020PDF

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 NameRevisedPDF
Incon TSP-DMS Sensor Installation4/2011PDF
Veeder-Root 794380-323 Sensor Installation1/2013PDF
Veeder-Root 794380-333 Sensor Testing Guidance1/5/2023PDF

This page was last modified on 10/30/2024