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<DIV>Pipes are often laid into a gravel bed that acts to concentrate water in
the area. Roots would be attracted there for water and aeration, like
structural soil.</DIV>
<DIV> </DIV>
<DIV style="FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt">Stephen
Smith<BR>Urban Forest Associates Inc.<BR>Urban Forestry and Ecological
Restoration<BR>www.ufora.ca</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=jadunster@gmail.com
href="mailto:jadunster@gmail.com">Julian Dunster</A> </DIV>
<DIV><B>Sent:</B> Thursday, November 24, 2011 2:58 PM</DIV>
<DIV><B>To:</B> <A title=canufnet@list.web.net
href="mailto:canufnet@list.web.net">Canadian Urban Forest Network</A> </DIV>
<DIV><B>Subject:</B> Re: [CANUFNET] Fwd: Roots causing damage to Gas and Oil
pipelines</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none">I
thin the moisture results because of the temperature differential betwen inside
and outside of the pipe, causing moisture to condense outside.<BR><PRE class=moz-signature cols="72">On Behalf of Dunster and Associates Environmental Consultants Ltd.
Dr. Julian A Dunster R.P.F., M.C.I.P., ISA Certified Arborist,
ASCA Registered Consulting Arborist # 378,
PNWISA Certified Tree Risk Assessor # 1.
<A class=moz-txt-link-abbreviated href="http://www.dunster.ca">www.dunster.ca</A>
</PRE><BR>On 24/11/2011 9:55 AM, Ian Wilson wrote:
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<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: rgb(31,73,125); FONT-SIZE: 11pt">I
don’t understand this – why is there a higher moisture content around the
pipes? Is it because the pipe intercepts some of the soil
moisture? Julian if you know of any research please pass it
along.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: rgb(31,73,125); FONT-SIZE: 11pt"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: rgb(31,73,125); FONT-SIZE: 11pt">I’ve
had many people claim that tree roots break sewer lines because they “know”
there is water in the pipe but in my experience the roots only capitalize on
pipes that are already leaking or cracked (and obviously they don’t “know”
what is in the pipe)<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: rgb(31,73,125); FONT-SIZE: 11pt"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: rgb(31,73,125); FONT-SIZE: 11pt">Ian
Wilson<o:p></o:p></SPAN></P>
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<P class=MsoNormal><B><SPAN style="FONT-FAMILY: 'Trebuchet
ms','sans-serif'; COLOR: rgb(183,18,52); FONT-SIZE: 10pt">Ian
Wilson</SPAN></B><SPAN style="FONT-FAMILY: 'Trebuchet
ms','sans-serif'; COLOR: rgb(31,73,125); FONT-SIZE: 10pt">, Park
Services Manager<BR><B>Park Services <o:p></o:p></B></SPAN></P>
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250 469-8842<o:p></o:p></SPAN></P>
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<P class=MsoNormal><B><SPAN
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style="FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: windowtext; FONT-SIZE: 10pt">
<A class=moz-txt-link-abbreviated
href="mailto:canufnet-bounces@list.web.net">canufnet-bounces@list.web.net</A>
[<A class=moz-txt-link-freetext
href="mailto:canufnet-bounces@list.web.net">mailto:canufnet-bounces@list.web.net</A>]
<B>On Behalf Of </B>Julian Dunster<BR><B>Sent:</B> Thursday, November 24, 2011
9:32 AM<BR><B>To:</B> Canadian Urban Forest Network<BR><B>Subject:</B> Re:
[CANUFNET] Fwd: Roots causing damage to Gas and Oil
pipelines<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p></o:p> </P>
<P class=MsoNormal>The moisture issue and how it attracts roots to pipes has
been known for years. I recall Matheck discussing it and I am sure it is
documented. I have never heard of the corrosion aspect before. Ask for some
evidence showing that roots have caused the corrosion. <BR><BR><o:p></o:p></P><PRE>On Behalf of Dunster and Associates Environmental Consultants Ltd.<o:p></o:p></PRE><PRE><o:p></o:p> </PRE><PRE><o:p></o:p> </PRE><PRE>Dr. Julian A Dunster R.P.F., M.C.I.P., ISA Certified Arborist,<o:p></o:p></PRE><PRE>ASCA Registered Consulting Arborist # 378, <o:p></o:p></PRE><PRE>PNWISA Certified Tree Risk Assessor # 1.<o:p></o:p></PRE><PRE><o:p></o:p> </PRE><PRE><A href="http://www.dunster.ca" moz-do-not-send="true">www.dunster.ca</A><o:p></o:p></PRE>
<P class=MsoNormal><BR>On 23/11/2011 7:40 AM, Ray Morgan wrote:
<o:p></o:p></P>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>As per the subject line, I just came back from a meeting
with a high profile oil company on how roots of trees/shrubs are
decaying/corroding the protective coating on oil and gas pipe
lines.<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>They are saying that because of the moisture content that
surrounds the pipes, roots are attracted to this and are now "wrapping"
themselves around the lines. They are claiming that this(roots causing damage)
is causing the protective coating to decay or corrode, which they say,
increases the risk for pipe failure.<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>The pipeline is situated on a city easement that allows for
the current underground oil & gas infrastructure and for future additions,
essentially it's a oil and gas easement. <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>Trees and shrubs have been planted (1989) on this city
easement to provide a visual barrier to the industrial and commercial areas of
Regina. The company has signed an agreement to this, back in the early 90's.
<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>They are requesting that the plant material be removed
because there is a concern that if the roots continue to corrode or decay the
coating, this may cause leaks, explosions and loss of
life.<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>This will have a significant impact to other areas of the
municipality as there is natural gas, oil and other underground petroleum
utilities. This decision could be precedence setting, even for
homeowners.<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>I'll have our legal staff take a look into this and get
their input as well.<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>There is no question that public safety is one of our first
priorities here in Regina and that if a tree is of a public safety concern and
we've determined this, we will remove it.<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>My questions are;<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>1. Has anyone dealt or heard of this concern
before?<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>2. They have verbally indicated this, but I feel they
should have data to support this. Is there any documentation out there that
supports their claim? <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>3. If the data/research is there that supports their claim,
please pass this onto me.<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>Much appreciated and look forward to your
response,<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>Ray Morgan<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>Manager, Forestry, Pest Control &<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>Horticulture Branch<o:p></o:p></P></DIV>
<DIV>
<DIV>
<P class=MsoNormal>Parks and Open Space Department<o:p></o:p></P></DIV></DIV>
<DIV>
<P class=MsoNormal>City Operations Division<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>P: 306.777-7065<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>C: 306.531-5119<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>E: <A href="mailto:rmorgan@regina.ca"
moz-do-not-send="true">rmorgan@regina.ca</A><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>Regina.ca<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
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