HomeMy WebLinkAbout1986-05-05 Letter, Proposed Curtain Drainr
CITY of ORONO
Post Ofte Box 66 • Cal BRy, Minnesota 55M • Mil Odkm
On the North Shore o/ Lake Minnetonka
May 5, 1986
VanEeckhout Building Corp.
1935 W. Wayzata Blvd.
Long Lake, HN 55356
RE: Proposed Curtain Drain, 2200 Devin Lane
Dear Mr. VanEeckhout,
Regarding your proposal to construct a curtain drain at 2200
Devin Lane in order to attempt to artificially and permanently
drain the soils in the drainfield location so that a trench
drainfield can be constructed to sewer the home at this site, the
following will apply:
1) A grading permit shall be obtained prior to commencing
excavation since this is extra work not included in the
original application and will require additional site
inspection by staff. (Permit Fee $50.50)
2) The curtain drain may not extend into the area of the
approved drainfield sites, so that should the artificial
drainage attempts fail, the primary and alternate sites will
still be suitable for a pressurized mound system as
originally proposed.
3) If the curtain drain is to be tied in with the footing
drains for the house, this must be reviewed and approved by
Building Inspector Tom Jacobs.
4) A plan of the proposed curtain drain must be submitted
when applying for the grading permit including the
following:
a) Site plan showing location of proposed curtain
drain, showing the proposed outlet of such drain.
b) Provide a cross-section of the curtain drain,
showing the depths and nature of the materials to be
used.
c) Show the location and depth of monitoring borings
which can be viewed by staff on a timely basis:
i) Locate monitoring holes a) 40' north of the
curtain drain and b) 40' west of the curtain drain
and c) 20' east of the most easterly soil boring.
ii) Also use existing boring holes in drainfield
site for site monitoring.
BUILDING! ZONING - 473.7357 U ADMINISTRATION At FINANCE - 473.7338 0 PUBLIC WORKS - 473-7339
ASSESSING
5) Remove f111 excavated from curtain drain from proposed
drainfield site - do not disturb the exisiting sites by
filling, traffic, grading, etc.
We have discussed the fact that because it is spring, the
seasonal saturated zones will be starting to disappear naturally.
Unless we see a drastic and obvious relative change in the
saturated zones throughout the drainfield sites ( a change
relative to adjacent areas not affected by the curtain drain) we
cannot even consider the proposal to use a trench system. This
is your risk, and if the curtain drain fails to have a verifiable
effect on the seasonal saturation of the site, the mound systems
will still be required. I will be out of town May 6-9, please
contact Tom Jacobs or Lyle Oman during that time if you have any
questions.
Sincerely,
f�
Michael P. Ga ron
Assistant Zoning Administrator
MPG/PP