HomeMy WebLinkAboutRe: septic setback/wetland �
f March 19th, 2015
From: Dale Denn
HomeStead Septic
1108 Goldenrod Lane
Shakopee,MN 55379
MPCA License# 583
C: 612-310-7887
Email: Homesteadseptic@outlook.com
To: Loren Konen
Metro West Inspections
689 N Medina Street
Loretto, MN 55357
Regarding: 517 Ferndale Road Request for Septic System Setback Reduction to a Wetland.
HomeStead Septic has been retained by Denali Homes to design a septic system. There are
particular site 'Hardships' in siting a primary septic system that requires a reduction in the City of
Orono minimum setback ordinance to a Wetland. This letter sites the particular hardships per the
request of the Septic Inspector. The requested setback reduction applies to both the Primary
Mound, the Septic Tanks, and the Pump Tank. A setback reduction is also being requested 'for the
record'regarding an Alternate Site that has been established and needs a variance to be used if ever
needed..
The setback distance to any one component of the septic system is the 12.5 minimum that has been
allowed and granted by the Minnehaha Watershed District. However, after having returned to the
site to re-evaluate and adjust for a 5 bedroom septic system, the actual setbacks are as follows:
(Please refer to the design drawing or the Survey):
The minimum setback distance is 16 feet, in two instances where the dual sandbed is at 16 feet to the
wetland. The other portions of the dual sandbed are 17 and 25 feet from the Wetland.
The minimum setback established in the field regarding the Rockbeds is 34 feet. The next minimum
distance to the rockbed is 44 feet. The upper split zone of the Mound has the rockbed at greater than
50 feet.
The septic tank and pump tanks could be set at 25 feet to the Wetland. This should work forgravity
feed out of the home and allows the setting of the tanks up in the upper front side of the home making
them more accessible for pumping and maintenance.
Regarding the Mound,the following Hardships were encountered:
1. Being a 'Lot of Record' there is limited room in general for the placement of a Mound
Septic that utilizes the best available and least disturbed soils.
2. Length of Contour:
The length of the contour needing to be on the same elevation is not long enough to
accommodate the Mound in one intact unit. The Mound has to be split into two equal
parts and set on the landscape at differing locations and elevation. This hardship
requires more space than a single Mound.
3. Degree of Slope:
The slope is fairly steep where the Mound needs to be and thus requires a significantly
bigger'footprint'than a Mound on lesser slopes. A 3:1 final slope grade is the minimum
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allowed by the State Septic Code. It will take a longer run downhill by virtue of the
natural slope to meet this ordinance requirement
4. Quality of Soils:
By having the ability to shift the Mound downslope off of the natural ridge that exists,
deeper topsoil is encountered. The tops on hills and ridges generally have less topsoil
due to natural erosion whereas side slopes and toe slopes usually accumulate deeper
topsoil. That is the same situation we have here: less topsoil on the top and shoulder
and more topsoil on the side and bottom areas. It is scientifically proven and
documented that topsoil is much more efficient and effective at treating household
septic effluent than subsoil. In other words, having topsoil underneath a septic system
provides a larger degree of environmental protection of groundwater than sparse
topsoil over subsoil. In this particular case,by having the Mound closer to the wetland,
there is a much higher probability of better treatment of the effluent and thereby more
protection of groundwater and the wetland by being closer to the wetland rather than
further away.
5. Attempts to establish an Alternate Site:
By keeping the split Mound relatively close to where it is proposed with an approved
reduction to the Wetland,this provides enough additional area to maintain an Alternate
site. For the record, a complete Alternate Site Design has been accomplished as an
added measure of planning for worst case scenario.
6. Ability to build Mound bigger than actual number of bedrooms:
For added treatment and protection of groundwater, all attempts have been taken to
build the Mound as big as possible beyond the 4 bedroom home Mound sizing. The final
Mound size established in the field is for a 5 bedroom home.......both the Mound and the
Tanks,etc.
7. Added treatment and protection methods:
A Timer is being installed for ensuring uniform and regulated Mound dosing such that
peak water use will not overdose the Mound at any one time. This gives the system
added treatment efficiency and effectiveness and further protects the groundwater and
the Wetland.
8. Septic and pump tank accessibility for servicing and maintenance:
The setback reduction is also requested for the septic tank and the pump tank. The high
tank manufacturing standards and high quality of tanks today ensures that there is very
little chance of tank leakage. The reduction is requested based on space limitation, to
get gravity feed out of the home, to be able to place the tanks closer to the front of the
home for pumping and servicing, and to ensure that there will be proper fall in the
sewer pipes and the pump lines for drainback to prevent freezing in the winter and
proper flow to prevent pipe clogging.
9. Alternate Site:
The lower portions of the proposed alternate site encroach the wetland to within
approximately 20 feet. Would like this cited as approved `for the record' for any future
use if ever need.
Drafted and Submitted by Dale Denn, HomeStead Septic.
Signed and Dated:
DGil,e Dev�.�n. March 19th,2015
- � MET�O WEST I1�ISPEC'�IOIY SEKVICES, IIYC.
Loren Kohnen, Pres. (763) 479-1720
FAX (763) 479-3090
April 6, 2015 O�� Mtrowst76@aol.com
O��0 �
TO: Joe Mailhot
Denali Custom Fiomes
18352 Minnetonka Boulevard
Deephaven, MN 55391
FROM: Loren Rohnen
RE: City of Orono
Septic System Setbacks
517 Ferndale North, Orono, MN
VARIANCE REQUESTS
517 Ferndale North is an existing parcel. Denali Custom Homes is pro-
posing to build a new home for the owners of the parcel, Mr_ and Mrs.
Steve Andersen. Problems finding areas for the septic system have
been uncovered. A number of variances are being requested. Without
the variances the Andersens would not be able to use the property as
the zoning permits. The Variances are as follows:
1) Septic is a split mound system/two mounds to maintain staying on
the contour.
2) 2 - 1500 gal. septic tanks outside the buffer area:
Fc��ue5i.: 2� " �eyuif�3: 5� ' Variance: 2� '
3) 1 - 2000 gal. pump tank outside buffer area:
Request: 25 ' Required 50' Variance: 25'
4) lst mound of a 2 mound system:
Request: 16 ' from wetland (part in buffer) setback of 50' .
Request 16 ' Required 50' Variance: 34 '
5) 2nd mound of the 2 mound system:
Request: 16 ' from wetland(part in buffer) setback of 50' .
Request: 16 ' Required: 50' Variance: 34'
2nd mound also requesting a 2nd variance for the West corner
of the mound.
Request: 34' Required: 50 ' Variance: 16 '
I am going to approve the variances with stated hardships in this report
and letter of variance requests, with the following conditions being
met:
1) Requests and survey be submitted to Minnehaha Creek Watershed
District for approval in letter form.
2) Pre-treatment be provided to help protect wetland. Information on
treatment be provided to City of Orono via Metro West Inspections
(Loren Rohnen) for approval.
Box 248, Loretto, Minnesota 55357
Y , •
, •
April 6, 2015
Page Two �
517 Ferndale N.
Orono, MN
3. Perc tests (2) be provided and 2 soil borings in the alternate
site shown on survey.
4) Contractor to agree to pay all expenses to the City of Orono for
plan review and inspections. This is considered a Type 3 system.
5) A Letter of Credit be given to the City of Orono in the amount of
$5000.00 to pay for plan review and inspections.
If you have any questions, please give me a call.
METRO WEST INSPECTION SERVICES, INC.
Loren Ro�nen
Building Official
�:]9
cc: City of Orono
,
CERTIFICATE OF SURVEY FOR
DENALI CUSTOM HOMES, LLC
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�.. SW CORNER OF NORTH 1/2. `�..SOUTH LINE OF NORTH 1/2,
-SE 1/4,NE 1/4 SEC. 36-118-23 -SE 1/4,NE 1/4 SEC. 36-118-23 LEGAL DESCRIPTION :
Thot part of the North Half of [he Southeast Ouarter of the Northeast Quarter of Section 36,Township 118 North,
Range 23 West of the 5th Principal Meridian, describetl as (ollows: Beginning at a point in the South line of said
North Holf of the Southeast Quarter of the Northeast Quarter, distant 211 feet East of the Southwest comer thereof;
thence East along said Sauth line 330 feet; thence at a right onc�le North 344.5 feet; thence at a right anqle West
to an intersection with a line runninq from a point in [he South line of said North Half of the Southeast Quarter
of the Northeost Quarter, distrnt 391 feet East of the Southwest comer thereof, to a point distant 675 feet South
of the North line and 830J5 feet West of the Eost line of Government Lot 3 in said section, soid last described line
being hereinofter designated and referred to as "Line A"; thence Northerly olong said "Line A" to a point 200 feet
PROPOSED ELEVATIONS : �verify� south of the North line of said North Holf of the Southeast�uarter of the Northeast Ouarter, thence West parallel
with the North line of said North Half of the Southeast Quarter of the Northeast Quarter to an intersection with a
1� Garoge = 1008.0 line drown northerly from the point o(beginning and parallel with aforesaid "Line A"; thence southerly olong last
said parollel line to the point af beqinning.
2� Top of foundation = 1006.8 Iron morker (ound
5io.8: denotes proposed spot eleva[ion, mean sea level datum
3� MOin fl0o� =1008.77 --e^7�--: Existing contour line, meon sea level datum
v: proposed contour line
4� Basement = 998.08 Bearin dshawn orePbas d Wetlond buffermedndatum
gs upon an assu
This s vey intends to show the boundar'ies and topography of the above described property, and the proposed location
of o proposed house, pool, and grades thereon. It does not purport to show any other improvements or encroachments.
REvisioNs ��,�REB°°ERT�FYTH^TTH�S°�NSPE��F��^r�°�°RREP°R GRONBERG & ASSOCIATES INC.
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