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.� _ . � Melanie Curtis From: Mark [markg@gronbergassoc.com] Sent: Tuesday, January 29, 2013 4:34 PM To: Melanie Curtis Subject: RE: 20130129 4156 Highwood Rd -2013-00005 We will show a solid pvc sleeve under the wall rather than a draintile in that location. After talking with the builder it is not the intent to remove the wall, only to fill over it where possible, so we will add a note to that effect. We will show some riprap at the end of the pipe outlet on the east side. The old house drained to the alley on the west and then the drainage came back onto the 4156 property farther down the hill towards the lake. With the tight lot and a couple of trees near the lot line it is tough to run a swale on the 4156 property. After talking with the builder we are proposing a gutter along the west side of the house in order to keep most of the water on this property. Would that be acceptable in light of the drainage patterns that presently exist? From: Melanie Curtis [mailto:MCurtisC�ci.orono.mn.us] Sent: Tuesday, January 29, 2013 1:52 PM To: 'Steve Clinton' Cc: scott.musgjerd@ubs.com; Mark Subject: FW: 20130129 4156 Highwood Rd - 2013-00005 Melanie Curtis �' 952.249.4627 � mcurtis@ci.orono.mn.us From: Jesse Struve Sent: Tuesday, January 29, 2013 1:20 PM To: Melanie Curtis Cc: Christine Mattson Subject: 20130129 4156 Highwood Rd - 2013-00005 Melanie, I have reviewed the new survey dated received 1/29/13 and have the following comments: • The updated survey only lowered the invert for the pipe under the retaining wall by 0.5' meaning there will only be just over 1' of cover from the top of pipe to the bottom of retaining wall. I still have concerns the pipe will be damaged by the installation of the retaining wall or the ground pressures from the wall can potentially crush the pipe. I will need to see additional documentation regarding to the structural integrity of the pipe with the wall being placed so close to the top of it. • A note was changed regarding the existing retaining wall along the east property line. The original note was "Stone retaining wall to be filled over", but it now says"stone retaining wall to be filled over or removed". If the intent is to remove the wall, the applicant will need temporary grading easements from the neighboring property because this work will impact their property. • I missed it on my first review, but the survey will need to address potential erosion caused by the installed drain tile. There will need to be some sort of energy dissipater at the end of the pipe to make sure it will not erode the existing slope down to the lake. • The grading on the west side of the property will need to be adjusted to maintain the drainage on the property. Jesse Struve, PE Director of Public Works/City Engineer City of Orono (952) 249-4661 - Direct �