• Wanted - UST Inspectors
  L.U.S.T.Line #34, March, 2000

  "As we enter the new millennium and the underground storage tank (UST) program deadlines are all part of the past century, we need to take a fresh look at where we are headed."............... MORE >>
   

• FAQ #1 - Can ELLDs Be Used As A Line-Tightness Test Method?
  L.U.S.T.Line #48, November, 2004

  "Companies such as Veeder-Root and INCON are marketing their electronic line leak detectors (ELLDs) to the regulated community as Line-Tightness Test Methods,"............... MORE >>
   

• FAQ #2 - What�s All The Fuss About Equivalency?
  L.U.S.T.Line #49, March, 2005

  "Some of the automatic electronic line-leak-detector listings in the List of Leak Detection Systems (the List) talk about 'equivalent leak rates.'  What does that mean?"............... MORE >>
   

• FAQ #3 - Old And New CITLDS Protocols - What's That About?
  L.U.S.T.Line #50, August, 2005

  "Has any CITLDS equipment that was evaluated and third-party certified using the old manufacturers� protocols been accepted by the NWGLDE?"............... MORE >>
   

• FAQ #4 - What Are The CITLDS Protocol Throughput Limitations?
  L.U.S.T.Line #51, December, 2005

  "Before we can discuss throughput, we must first know how it is defined in the protocol.  According to the CITLDS protocol, throughput is the volume of product dispensed from a tank in a month."............... MORE >>
   

• FAQ #5 - Automatic Mechanical Line Leak Detectors (MLLDs) - Part I
  L.U.S.T.Line #52, May, 2006

  "Why do some MLLD manufacturers offer MLLDs that are certified for multiproduct (e.g., gasoline, diesel), and others for diesel only? When MLLDs were first introduced (circa 1960),"............... MORE >>
   

• FAQ #6 - Automatic Mechanical Line Leak Detectors (MLLDs) - Part II
  L.U.S.T.Line #53, September, 2006

  "Can an MLLD evaluated in a rigid pipeline system be used in a flexible pipeline system?  Due to the difference in bulk modulus (amount of stretching under pressure) between rigid piping and flexible piping, MLLDs designed for use in rigid pipelines may not be satisfactory for use in flexible-pipeline applications"................ MORE >>
   

• FAQ #7 - Leak Detection Equipment and Alternative Fuels
  L.U.S.T.Line #54, February, 2007

"Is leak-detection equipment compatible with alternative fuels?  Third-party evaluations are a useful tool to verify leak-detection equipment performance, but evaluation protocols do not require testing for long-term compatibility with any stored product.  Because of this, the NWGLDE makes no representations"................ MORE >>

• FAQ #8 - Everything You Always Wanted To Know About The NWGLDE Disclaimer
  L.U.S.T.Line #55, June, 2007

"In your last FAQ article, you referred to a disclaimer on your website. What does this disclaimer mean to those of us who regularly use the NWGLDE List?"................ MORE >>

• FAQ #9 - What Is CITLDS Leak Detection All About?
  L.U.S.T.Line #56, August, 2007

"In this issue of FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE), we follow-up on a FAQ from L.U.S.T.Line #50 (August 2005).  At that time we discussed protocols used for evaluating CITLDS without explaining what CITLDS leak detection is all about. We now present the rest of the story."................ MORE >>

• FAQ #10 - ATG Probe Performance with Ethanol Fuels
  L.U.S.T.Line #58, September, 2008

"In this issue�s FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE), we discuss the ability of ATG probes to perform leak detection in tanks containing ethanol fuels."................ MORE >>

• FAQ #11 - Questions About Sensors - Part I
  L.U.S.T.Line #59, November, 2008"

"As the new secondary-containment requirements come into effect across the country, electronic interstitial monitoring will soon become the norm instead of the exception. Since electronic interstitial monitoring usually involves some type of sensor, in the next two issues of FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE), the Work Group will answer questions concerning sensors listed on the NWGLDE website at NWGLDE.org."................ MORE >>

• FAQ #12 - Questions About Sensors - Part II
  L.U.S.T.Line #60, February, 2009

  "This FAQ is broader in scope than the previous one.  Because of the Energy Act of 2005, The previous FAQ addressed interstitial monitoring exclusively.  In addition to addressing sensors related to monitoring UST-system interstitial spaces, this FAQ also discusses sensors used in vapor and groundwater monitoring applications."................ MORE >>

   

• FAQ #13 - Finding Outdated Equipment on the NWGLDE List
  L.U.S.T.Line #61, May, 2009

  "This FAQ is broader in scope than the previous one.  Because of the Energy Act of 2005, The previous FAQ addressed interstitial monitoring exclusively.  In addition to addressing sensors related to monitoring UST-system interstitial spaces, this FAQ also discusses sensors used in vapor and groundwater monitoring applications."................ MORE >>

   

• FAQ #14 - A Short History of the NWGLDE
  L.U.S.T.Line #62, August, 2009

  "This FAQ is broader in scope than the previous one.  Because of the Energy Act of 2005, The previous FAQ addressed interstitial monitoring exclusively.  In addition to addressing sensors related to monitoring UST-system interstitial spaces, this FAQ also discusses sensors used in vapor and groundwater monitoring applications."................ MORE >>

   

• FAQ #15 - More Questions about Throughput!
  L.U.S.T.Line #63, December, 2009

  "This FAQ is broader in scope than the previous one.  Because of the Energy Act of 2005, The previous FAQ addressed interstitial monitoring exclusively.  In addition to addressing sensors related to monitoring UST-system interstitial spaces, this FAQ also discusses sensors used in vapor and groundwater monitoring applications."................ MORE >>

   

• FAQ #16 - Evaluating ATGs for a 0.1 gph Leak Rate
  L.U.S.T.Line #64, March, 2010

  "In this LUSTLine FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE), we clarify how ATGs are listed after being third-party evaluated for detecting a 0.1 gph leak."................ MORE >>

   

• FAQ #17 - Continuous Leak Detection Methods
  L.U.S.T.Line #65, June, 2010

  "In this LUSTLine FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE), we discuss the differences between the types of continuous leak detection methods that are available for detecting leaks from single-walled underground storage tank (UST) systems." .................. MORE >>

   

• FAQ #18 - Unsupported Leak Detection Methods
  L.U.S.T.Line #66, December, 2010

  "In this LUSTLine FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE), we discuss leak detection methods that are no longer supported by the company that markets them."................ MORE >>

   

• FAQ #19 - Adding Biodiesel Blends to NWGLDE Leak-Detection Equipment Listings
  L.U.S.T.Line #67, March, 2011

  "In this LUSTLine FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE), we discuss our policy for the addition of biodiesel blends to our leak-detection-equipment listings."................ MORE >>

   

• FAQ #20 - Getting the Most Out of the NWGLDE Website
  L.U.S.T.Line #68, June, 2011

  "In this LUSTLine FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE), we look at the information that is accessible from the NWGLDE website at www.nwglde.org."................ MORE >>

   

• FAQ #21 - Secondary- and Spill Containment Test Methods
  L.U.S.T.Line #69, December, 2011

  "In this LUSTLine FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE), we will discuss the reasons why there is an absence of secondary- and spill containment test method equipment listings."................ MORE >>

• FAQ #22 - Here's How to Determine if an NWGDLE Listing Is Applicable for Use with Biodiesel Blends
  L.U.S.T.Line #70, May, 2012

  "In this LUSTLine FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE), we will discuss the listings and biodiesel."................ MORE >>

   

• FAQ #23 - Do All Implementing Agencies Recognize NWGLDE Listings as Acceptable?
  L.U.S.T.Line #72, March, 2013

  "In this LUSTLine FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE), we will discuss local agencies use of NWGLDE listings."................ MORE >>

  
  

• FAQ #24 - 2013: The 20th Anniversary of NWGLDE
  L.U.S.T.Line #74, June, 2014

  "In this LUSTLine FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE), the NWGLDE answeres some questions related to its 20th anniversary."................ MORE >>

• FAQ #25 - What Is the Correct Operating Mode for My ATG—95% or 99%?
  L.U.S.T.Line #75, October, 2014

  "In this LUSTLine FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE), we discuss the different operating mode settings that can be used on an automatic tank gauge (ATG)."................ MORE >>
  
  

• FAQ #26 - How to Get a New Leak Detection Device Listed on the NWGLDE Website
  L.U.S.T.Line #78, August, 2015

  "In this issue’s FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE) we discuss the procedure that must be followed before a leak detection device may be listed by the NWGLDE."................ MORE >>
  
  

• FAQ #27 - How the NWGLDE List of Leak Detection Systems Can Be Used to Assist Compliance with the Revised 2015 Federal UST Regulation
  L.U.S.T.Line #80, June, 2016

  "In this issue’s FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE) we discuss how the NWGLDE List of Leak Detection Systems can still be used to comply with the revised 2015 Federal UST Regulation."................ MORE >>
  
  

• FAQ #28 -Leak Detection Test Method Listings for Underground Piping Associated with Airport Hydrant Fuel Distribution Systems and Field-Constructed Tanks on the NWGLDE Website
  L.U.S.T.Line #82, June, 2017

  "In this LUSTLine FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE) we discuss revisions to “Large-Diameter Piping” leak detection methods in response to new release detection requirements for airport hydrant fuel distribution systems and field-constructed tanks."................ MORE >>
  
  

• FAQ #29 -Statistical Inventory Reconciliation (SIR) The Rules, the Listing, the Site Report
  L.U.S.T.Line #83, December, 2017

  "In this LUSTLine FAQs from the National Work Group on Leak Detection Evaluations (NWGLDE) we discuss the recently updated USEPA underground storage tank (UST) rules which included changes for statistical inventory reconciliation (SIR). What does this mean for sites where SIR is used as their leak detection method?"................ MORE >>