NSF Standard 14/61 Certification

Underground Solutions, Inc. received certification under ANSI/NSF (National Sanitation Foundation) Standard 61, Section 4, Pipes and Related Products, for its Duraliner™ products in July of 2002. NSF 61 is the nationally recognized health effects standard for all devices, components and materials that contact drinking water. This certification includes Duraliner™ sizes from 4" to 36".

In February of 2004, UGSI also received NSF-61 certification for its Fusible C-900®, Fusible C-905®, and FPVC®. The size range covered is also 4" through 36".

The National Sanitary Foundation lists the contact material and code as PVC. This means that PVC is the material in our products that comes in contact with drinking water, and that NSF recognizes it as safe.

The water contact temperature listed in the certification is CLD 23, which is 23 degrees Celsius, or 73 degrees Fahrenheit, or ambient temperature-the standard temperature used in PVC material properties determination.

While the listing is for the expanded end product, the NSF has determined that the PVC starting stock used to produce Duraliner™ must also be an NSF-listed product. NSF typically certifies starting stock producers by plant location (where the product is extruded). Duraliner™ starting stock is only extruded in NSF-listed facilities.

In January of 2007, UGSI also acquired NSF-14 certification for C900/C905 pipe as it applies to the requirements in certain states including Michigan. NSF 14 establishes minimum physical, performance, health effects, quality assurance, marking and record keeping requirements for plastic piping. The criteria was created for the protection of public health and the environment. This NSF approval certifies that Fusible PVC™ is suitable for potable water use, applicable ASTM standards and UGSI's quality control process.

NSF certification follows a 7-step process:

Application Submission of formulation information Formulation review by NSF toxicology staff Audit of final production facility and product sampling Lab testing of the product per the standard Toxicology evaluation of the lab results Listing

Fusible C-900®, Fusible C-905®, FPVC® and Duraliner™ have been audited, tested, and evaluated per this process, and test reports are on file with the NSF.

The NSF is a trusted independent non-government organization dedicated to achieving solutions to public health and environmental issues. Its standards and certification process involve those who are directly and materially affected by the standard, and NSF has balanced input from industry representatives, user/consumers, and public health/regulatory officials. NSF provides testing, certification, and audit services on more than 130,000 products in over 82 countries. Based in Ann Arbor, Michigan, the NSF is accredited by the American National Standards Institute(ANSI) to develop American National Standards. NSF has developed over 50 voluntary standards as a result.

NSF routinely surveys the status of adoption of NSF 61 by state. A December 2001 report indicates that all 50 states intend to use NSF 61 and nearly all have implemented legislation adopting NSF 61. The Association of State Drinking Water Administrators(ASDWA) in Washington, DC performed the survey.