HomeMy WebLinkAboutEngineer letter 070109 1000 LION'S RIDGE LOOP, VAIL CO 81657 970-476-8644 FAX 970-476-8616
June 30, 2009 PLC Job#: 1695
Nina Timm
Senior Housing Coordinator
Town of Vail
RE: Arosa Duplex – Site Constraints
DRAINAGE
The original intent through the RFP for drainage conveyance through the property was to
convey the stream through an open ditch and only pipe a section under the driveway. As the
design process has progressed it has been shown that the width of the drainage is taken up by
the structure, driveway and back-out and does not allow for open channel flow; therefore, the
drainage must be piped through the property.
The storm pipe will be required to have a 15’ easement and due to drainage patterns and
alignment constraints, the pipe will run through the center of the property; thus constraining the
buildable area.
SNOW STORAGE
The site plan developed by VAG that shows the structure within the setback allows for a
shallow ditch adjacent to Arosa Drive. With this layout, the shallow ditch will capture
nuisance drainage and sediment due to snowmelt from stockpiled snow on Arosa Drive.
If the structure and driveway were moved to the north 3’, this would greatly impact the amount
of snow storage for the roadway. (See Attachment) The reduction would only allow for
approximately ¼ the amount of snow to be stored. Moving the driveway 3’ would place the
edge of driveway at the bottom of the slope from Arosa Drive, eliminating the shallow ditch
then requiring a concrete pan to handle the nuisance flows. All sediment from Arosa Drive
will now be channeled through the duplex property.
L. Mark Luna
Vice President /
Senior Project Manager