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<DIV><FONT lang=0 face=Arial size=2 FAMILY="SANSSERIF" PTSIZE="10"><B>"<I>It is
not our differences that divide us. It is our inability to recognize, accept,
and celebrate those differences</B>"</I><BR></FONT><FONT lang=0 face=Arial
color=#000000 size=1 FAMILY="SANSSERIF" PTSIZE="8"><I>(Audre Lorde 1934-92)
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From: MPress@cityofevanston.org<BR>To:
city-newsletter@mail.cityofevanston.org<BR>Sent: 1/30/2009 3:43:33 P.M.
Central Standard Time<BR>Subj: CITY OF EVANSTON e-newsletter: January 30,
2009<BR></DIV>
<DIV> </DIV><FONT style="BACKGROUND-COLOR: transparent" face=Arial
color=#000000 size=2>
<DIV class=Section1>
<P class=MsoNormal><B><FONT face="Times New Roman" size=5><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 18pt">PRESS
RELEASE<o:p></o:p></SPAN></FONT></B></P>
<P class=MsoNormal><FONT face="Times New Roman" size=5><SPAN
style="FONT-SIZE: 18pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt">DATE:
Friday, January 30, 2009 / TIME: 3:00 PM<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt">SUBJECT:
Continued water conservation measures requested<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt">FROM:
Rolanda B. Russell, Interim City Manager<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="TEXT-ALIGN: center" align=center><st1:City
w:st="on"><B><FONT face="Times New Roman" size=3><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 12pt">EVANSTON</SPAN></FONT></B></st1:City><B><SPAN
style="FONT-WEIGHT: bold"> WATER PLANT RESUMES <st1:place
w:st="on">NORMAL</st1:place> OPERATION;<o:p></o:p></SPAN></B></P>
<P class=MsoNormal style="TEXT-ALIGN: center" align=center><B><FONT
face="Times New Roman" size=3><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 12pt">CONTINUED VOLUNTARY WATER
CONSERVATION REQUESTED<o:p></o:p></SPAN></FONT></B></P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt">The City of <st1:place w:st="on"><st1:City
w:st="on">Evanston</st1:City></st1:place>’s water plant has resumed normal
operations after water intake was restricted due to ice build-up, but
customers are asked to continue voluntary conservation measures until at least
1:00 p.m. on Saturday, January 31. This involves curtailing non-essential
water usage, such as laundry, running the dishwasher,
etc.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt">Customers should be aware that weather forecasts
indicate that conditions will remain optimal for ice formation to reoccur for
the next several days. Therefore, it is recommended that customers draw and
store drinking water before going to bed tonight in the unlikely event that
the situation reoccurs over the weekend. <STRONG><B><FONT
face="Times New Roman"><SPAN
style="FONT-WEIGHT: normal"><o:p></o:p></SPAN></FONT></B></STRONG></SPAN></FONT></P>
<P class=MsoNormal><STRONG><B><FONT face="Times New Roman" size=2><SPAN
style="FONT-WEIGHT: normal; FONT-SIZE: 11pt">
<o:p></o:p></SPAN></FONT></B></STRONG></P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt">Residents are requested to check for status updates on
the City Web site (<A title=http://www.cityofevanston.org/
href="http://www.cityofevanston.org/">www.cityofevanston.org</A>), <st1:place
w:st="on"><st1:PlaceName w:st="on">Evanston</st1:PlaceName> <st1:PlaceName
w:st="on">Community</st1:PlaceName> <st1:PlaceName
w:st="on">Media</st1:PlaceName> <st1:PlaceType
w:st="on">Center</st1:PlaceType></st1:place>’s cable channel 16, and radio
station (1650-AM). A recorded message will be posted at (847) 448-8058 after
5:00 p.m. on January 30.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><STRONG><B><FONT face="Times New Roman" size=2><SPAN
style="FONT-WEIGHT: normal; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></B></STRONG></P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt">We appreciate the citizens’ efforts during this
period.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><U><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt"><o:p><SPAN
style="TEXT-DECORATION: none"> </SPAN></o:p></SPAN></FONT></U></P>
<P class=MsoNormal><U><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt"><o:p><SPAN
style="TEXT-DECORATION: none"> </SPAN></o:p></SPAN></FONT></U></P>
<P class=MsoNormal><U><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt">Read on for further information about today’s
events:<o:p></o:p></SPAN></FONT></U></P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt">Between the hours of 4:30 a.m. and 12:30 p.m. on
Friday, January 30, the City of <st1:place w:st="on"><st1:City
w:st="on">Evanston</st1:City></st1:place> treatment plant was unable to bring
water into the treatment process due to an icing condition on the
intakes. During this time, the Evanston Water Plant continued to supply
high-quality water to its customers at a reduced rate from onsite storage. At
no point in time was the quality of water in the system compromised.
Communities which receive water from <st1:place w:st="on"><st1:City
w:st="on">Evanston</st1:City></st1:place> were asked to conserve water and
their water supply was not curtailed. <o:p></o:p></SPAN></FONT></P>
<P><U><FONT face="Times New Roman" color=black size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: black">Background:<o:p></o:p></SPAN></FONT></U></P>
<P><FONT face="Times New Roman" color=black size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: black">This situation can occur during winter
months, and the Evanston Water Plant modifies its operation anticipating that
this icing condition may occur. Pumping is decreased at night and increased
during the day to fill all of the potable water storage facilities. There is
normally sufficient storage of potable water at the water plant and in the
distribution system to wait out this type of
situation.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt">Customers which use large amounts of water, such as
<st1:PlaceName w:st="on">Northwestern</st1:PlaceName> <st1:PlaceType
w:st="on">University</st1:PlaceType>, <st2:Sn w:st="on">St.</st2:Sn>
<st2:middlename w:st="on">Francis</st2:middlename> <st2:Sn
w:st="on">Hospital</st2:Sn> and the <st1:place w:st="on"><st1:PlaceName
w:st="on">North</st1:PlaceName> <st1:PlaceType w:st="on">Shore</st1:PlaceType>
<st1:PlaceName w:st="on">Medical</st1:PlaceName> <st1:PlaceType
w:st="on">Center</st1:PlaceType></st1:place>, were contacted at 8:00 a.m. and
asked to voluntarily reduce usage deemed non-essential (i.e. laundry,
dishwashing, etc.). The cooperation from these facilities was excellent
and allowed the Water Utility more time to try to rectify the problem.
However, because the situation did not improve, at 11:45 a.m. the City issued
a press release asking all customers to conserve
water.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><U><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 11pt">Read on for more information on frazil/ anchor ice
formation: <o:p></o:p></SPAN></FONT></U></P>
<P class=MsoNormal
style="MARGIN-LEFT: 7.5pt; MARGIN-RIGHT: 7.5pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><FONT
face="Times New Roman" color=black size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: black">The formation of frazil and anchor ice
depends on meteorological conditions. In 1982, Gee Tsang outlined the
conditions for frazil and anchor ice formation in simple terms:
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal
style="MARGIN-LEFT: 7.5pt; MARGIN-RIGHT: 7.5pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><I><FONT
face="Times New Roman" color=black size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: black; FONT-STYLE: italic">In common language,
one says that frazil and anchor ice are likely to form on a cold, clear night
when the wind is strong, the humidity of the air is low, especially if such a
night follows a cold, windy, cloudy day.</SPAN></FONT></I><FONT color=black
size=2><SPAN style="FONT-SIZE: 11pt; COLOR: black">
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal
style="MARGIN-LEFT: 7.5pt; MARGIN-RIGHT: 7.5pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><FONT
face="Times New Roman" color=black size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: black">As Tsang says, in mid-latitudes anchor
ice tends to form at night. On mornings following anchor ice formation events,
the sun warms the water and anchor ice is released.
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=black size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: black">The drawing of lake water through the
intakes causes the water to super-cool (i.e. the water temperature is cooled
to below the freezing point). When this happens, ice can grow in the water
column. The first ice to appear is frazil (small disks or spicules of ice
suspended in the water column). The drawing of the water into the
intakes causes the frazil ice to stick to the intake pipe itself, forming
anchor ice (ice attached or anchored to
something).<o:p></o:p></SPAN></FONT></P>
<P><FONT face="Times New Roman" color=black size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: black">Super-cooling is the process of chilling
a liquid below its freezing point, without the phase change from liquid to
solid. Super-cooling of water is ubiquitous in nature, and is a necessary
precondition for the formation of frazil and anchor ice. Water in rivers,
lakes, and seas is only super-cooled to about 0.01 <SUP>o</SUP>C.
<o:p></o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal><EM><I><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></I></EM></P>
<P class=MsoNormal><EM><I><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">Mayre Press<FONT
color=purple><SPAN
style="COLOR: purple"><o:p></o:p></SPAN></FONT></SPAN></FONT></I></EM></P>
<P class=MsoNormal><EM><I><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">Deputy City
Clerk<o:p></o:p></SPAN></FONT></I></EM></P>
<P class=MsoNormal><EM><I><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">847-328-2100, ext.
2153<o:p></o:p></SPAN></FONT></I></EM></P>
<P class=MsoNormal><EM><I><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">847-448-8131
Fax<o:p></o:p></SPAN></FONT></I></EM></P>
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style="FONT-SIZE: 12pt; FONT-FAMILY: Arial"><A
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style="FONT-FAMILY: 'Times New Roman'">mpress@cityofevanston.org</SPAN></FONT></A></SPAN></FONT></I></EM><o:p></o:p></P>
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