Additional UST Installation Information

Dry Tank Interstice Monitoring Approvals

Pursuant to various tank manufacturers’ requests, the N.C. 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 NCDEQ 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 3/24/2017
Highland Tank Interstice Test 9/14/2015
Modern Welding Interstice Test 1/2012
Modern Welding Interstice Test - Additional Approved Tank Sizes 9/2017
Permatank Insterstice Test 11/22/2013

Tank Interstice Position Sensitive Sensor Installation

The following position sensitive sensor installation procdures are approved for use with tanks referenced in the NCDEQ 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 11/2014