HomeMy WebLinkAboutRe: septic review To: Jeanne A. Mabusth, Building & Zoning Administrator �
From: Stephen Weckman, On-Site Systems Manager
Date: October 13, 1992
Subject: Subdivision �1771, Jim and Sarah Markoe -
Septic Review
2 have reviewed the proposed soil testing and septic system
design for this property and would make the following comments.
LOT 1
Soil testing and system design has been submitted for a 4-
bedroom home including primary and alternate drainfield sites.
Both sites meet MPCA rules Chapter 7080 requirements, however
both sites have slopes greater than 6$ as required by Orono City
Code. The primary septic site has slopes between 6� and 8$ while
the alternate site averages 8� slope throughout. Both sites also
encroach within the required 20' lot line setback, requiring a
10' variance.
This lot does not have sufficient area available for a 5-
� bedroom home, therefore a 4-bedroom home will be the maximum home
size possible. The lot is limited due to excessive slopes and
extra caution must be exercised to assure that these sites may be
allowed to function adequately. For this reason, staff
recommends that a buffer strip 20' wide be set aside along the
north property line adjacent to the alternate drainfield site
which must not be disturbed or manipulated in any way in order to
avoid any problems resulting from land alterations. Also, no
hardcover should be allowed within 40' of the primary drainfield
site for Lot A for the same reason. As this lot has been
manipulated by dredging and filling, the proposed primary and
alternate drainfield sites are the only available areas suitable
for sewage treatment and extra care must be taken to ensure the
integrity of these sites.
Specific septic system details are included below:
- Designed for a 4-bedroom house
- Depth of seasonal saturation (mottling) is 2' to 3-1/2'
for both primary and alternate drainfield sites.
- Slope at the primary and alternate drainfield sites is
6$ to 8$ and 8� respectively.
- Percolation rates average 10 minutes per inch at 18
inches.
- Topographic location and site drainage is adequate.
- Variances will be required for slope (up to 8$ ) and for
lot line setback (10' variance).
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Septic Review, Subdivision #1771
October 13, 1992
Page 2
LOT 2
Soil testing and septic system design have been approved for
a 5-bedroom home including primary and alternate drainfield
sites. Both sites meet MPCA rules Chapter 7080 as well as Orono
City Code Section 12.30 requirements. Specific septic system
details are included below:
- Designed for a 5-bedroom house.
- Depth of seasonal saturation (mottling) is 1' to 2' for
both primary and alternate drainfield sites.
- Slope at the primary and alternate drainfield sites is
2$ and 5$ respectively.
- Percolation rates average 5.1 minutes per inch at 12"
and 18".
- Topographic location and site drainage is adequate.
- All setbacks meet City Code.
Summary
Staff recommends approval of the subdivision based on soil
testing from S-P Testing, Inc. dated November 20, 1989 as updated
October 1992. Several conditions are recommended for the
approval of this subdivision and are listed below:
1. No excavation, construction, or compaction shall be allowed
within 40' of the proposed primary treatement area for Lot
1.
2. No excavation, construction, or compaction shall be allowed
on that portion of the north lot line which is south of the
proposed alternate drainfield site for Lot ,Y. a��.
3. All four drainfield sites must be fenced off using snow
fencing to prevent compaction of these sites prior to any
traffic being allowed on this property and prior to plat
approval.
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