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Teresa Bender <br />From: Mike Ericson <br />Sent: Friday, April 21, 20171:11 PM <br />To: Teresa Bender, Charles Roberts <br />Subject: FW: 2016 Mill & Overlay <br />From: Paul Palzer <br />Sent: Friday, April 21,2017 12:15 PM <br />To: Mike Ericson <MEricson@CENTERVILLEMN.com> <br />Subject: Fwd: 2016 Mill & Overlay <br />FYI <br />From: Greg Burmeister <GBurmeister@CENTERVILLEMN.com> <br />Date: April 21, 2017 at 11:57:51 AM CDT <br />To: Matthew Montain <MMontain@CENTERVILLEMN.com>, Paul Palzer <br /><PPalzer@CENTERVILLEMN.com> <br />Subject: 2016 Mill & Overlay <br />Matt, I understand from Paul you were questioning the adjustments of utilities when we do the <br />overlays. As a rule we try to set them at 3/8" to %" but always error on the Y" side due to soil <br />conditions within our City. This is because in the event the structure casting raises with the frost we <br />don't hit them with the plow trucks. I measured the 5 manholes within the Hunters Crossing Addition <br />and measurements were from 3/8" to 1 %". The measurements are not representative of the initial <br />install adjustment. What happens over the winter with the freeze and thaw the matt, blacktop, actually <br />raises up around the structure which makes the top of matt distance to top structure greater than it <br />originally was. Different roadways react differently as to their base construction, moisture content and <br />the weather. As you can see even in the same addition the roadway moves differently in different areas. <br />You could take a drive down Mill Road and those manholes were done at the same time by the same <br />contractor and they have not moved as much as the structures you're referring to. Structures on Dupre <br />Road installed 2 years ago have not moved as much as other structures after 2 years of freeze / <br />thaw? We have areas in town where the manholes have moved over 5".We have very wet soils and <br />high ground water in this City which are highly susceptible to freezing. A true measure of the structure <br />adjustment would be to measure the structure soon after their adjustment prior to the freeze/thaw. I <br />hope this answers your questions, if you have any other questions please feel free to contact me. <br />Greg Burmeister <br />651-503-1834 <br />34 <br />