The EPA study examined 42
fiberglass and steel diesel UST
systems in every part of the
contiguous U.S., of various
ages, of various sizes and with
di;erent throughput profiles.
were experiencing more corrosion, gasket seal, warranty
issues or a combination of the problems than they did before
the introduction of ULSD.
In 2012, Battelle, at the request of the Clean Diesel Fuel
Alliance (CDFA), produced a formal study on possible corrosion causes. The Battelle report urged additional research
to con;rm the degree to which the corrosion affects the
nation’s 100,000 federally regulated diesel UST systems and
to gain clarity on causation.
The new EPA research ;lls in some of the gaps left by the
earlier studies. The largest and most comprehensive effort to
date, the EPA study examined 42 ;berglass and steel diesel
vehicle fueling UST systems at 40 sites. (The Battelle study
focused only on systems that use ;berglass tanks.)
Although the 42 tank systems spanned the contiguous
U.S. and were of various ages, of various sizes (from 5,000 to
20,000 gallons) and with different throughput pro;les, the
sample does not precisely represent the national demographic
of the owners of federally regulated USTs storing diesel for
three reasons, according to the EPA:
1. Owners of mulptiple UST systems generally are more
aware of UST system issues and maintenance needs
because of the requirements associated with operating
mutiple fueling systems.
2. The sample wasn’t random. The EPA wasn’t able
to obtain a 50-50 split of reported corroded and
noncorroded sites before research began.
3. No emergency generator tanks (EGTs) were included
in the sample. Thousands of EGTs across the country
store fuel longer than vehicle fueling USTs do, so many
conditions in EGTs are different than in USTs.
3 4 | PEI.ORG | Fourth Quarter 2016
firstname.lastname@example.org | www.cim-tek.com | 888-898-7187
Detects phase separation in
ethanol-blends up to 15%
AND water in neat gasoline.
UL LISTED | MADE IN USA