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' •� SEPTIC SYSTEM INFORMATION ��H�� I�E� N�� �EEI�
STREET ADDRESS M�CROFILMED
JON N�Tt�tiS' �,�✓c ff /...4kg
LOT � BLOCK � SUBDIVISION S�«�� /�-7�7.�%T70�
MONTH AND YEAR TESTING DONE aL���� �9�0
ITEMS ALREADY COMPLETED _ � f'�� �STS , � $o��tiG-S
NEED TO COMPLETE BEFORE ISSU�ING BUILDING PERMIT ;
OBORINGS
OPERC TESTS
SYSTEM DESIGN
�x J SITE PLAN
j�x
O OTHER
� � � �� � �� � �/��� .�/
•
SUBDIVISION FILE NO. ���
/
DATE THIS SHEET FILED � "����5� BY �'C �
� TNIS ITEM ��S �EEN
-� � MI�ROF'ILMED
SIT� EVAI.,U:ITION R�PORT '
i�'OR HARRISON R. JQHi15TON, JR.
ORONO, MINNFSOTA
10-22-80
During October J.7-22, 198� all five proposed lots in the sub-
division of Harrison Joh.�ston, Jr. were tested for the suitability
of supporting on-site drainfiAld sy3terns. �3ix percolation holes
were tested on each lot r�nd three soil borin�� taken on eacl� lot
to determine botil� primary and alternate drainfield sites, ihe
percolation holes were dug 6 inches in diar��eter to the 4 foot depth
except the altornate site on lot 1, block 2 where holos 5-6 were
dug 2 feet de��� to test for a sha�.low trench system. The holes were
dug with both po�rer and hand augers.
The soil borin�rs were du� t•rith hand au�ers and were � iriches
in diameter to the !� foot depth and 3 inche9 in diameter to the re-
n�aining depth, Some very permeable soils were found on most lots
aric? all lots ��ad sufficient percolation rates to qualiry for atan-
dard drainfield systems, The alternate sits on lot 1, bloak 1 will
require shallower trenches to avoid the water table. �Irhe trenchea
on the primary site of lc�t 1 , b].oak 3 will also need to be aonat-
ructed fairly shal] ow an�l an interceptor drain should be used to
divert runoff water from this site sinae the lot is bowl shaped �
and collects runoff water. �
Hetter soil was enaa�untered shallower on the alternate s te •
of 1 hould be ua d In lot
3 of block 1 a pump will probably be needed aince the best soils
exist on top of the hill. A so mig e necessary to use pumps
on other lots depen ng � th8 placement of the houses. Additiona�.
design inforn�ation for tY::e individual houses will bo needed prior
to construction. It is impe .rative that thase tested area not be �
disturbed since there are some steep sidehill slopes on some lots
ancl 3ome prohibitiva soils and water tab_i. :. near t��= marshes which
may r_,reclude an9 other areaa being used #'or drainfie�ds,
If any additional inPormation is ne�ded, please contaat me.
� ... i
- � -- TNIS ITEi� HAS ����
JO;ii'��`.�'0;1 PROP,.RTY MICROFILMED
LU't' 3, I�l.���.ii 1
. �
co zt3.on I�esults
-�o� c lio. I�:ateri�zl Perco_l�tion Rate
I'-1 Lt, II-rn. i�ine Sand 1.7 I�.in. linch
P-' Lt. Brn. 1�'ino �and 1,4
P-� Broti��n Loamp Sand 2. 2.
�'-t� Broi�rn i:oaar,y �3and 2.,�',
y-> Brown Loariy Sand 2.4
Y-6 T3rotan Loar,:y Sa,11d 2. 0
Th� avc�, p�3rcc�l�t� or. rate for h�].es 1-�.(pz•iinary ::,itQ) = 2.0 T�,PI.
'1'ha av�;. p�rcolat� on rate for holns �-6(al t, si te ) = 2, 2 A:PI.
Soil Borin�;s
L
:i � , r ,
Depth(ft, ) r�i�t`
0. 0-1.3 Blacl; Loar1
1. r-2.0 Gray ?3rn. Sandy T,oam
�.�-5. '� 13r�wn Fin:. Sgnd
��.�-7.S I.i te Browr.i Fine Sand
�i�.5-�. � Lt. IIrown Fine Sand, Powdery
ido mottled �oil or wator table a.fter 2L� hours. �
-,
:� . , -, � '
Depth(ft, ) r:aterial
______.___,._
0. ��-1. �, Black I,oam
1.5-2.5 , i�ray Brn, Sandy Loam �
2.5-,�.0 Brown Fine 3and
�. 5-�.5 Gray Brn. :Fine Sarid
>.5-8,0 Lt. Brown :E�ine Sand
No mottleci soil or water table after 21� hours.
" :_ 3
J� � !�•
i�on tn rt, r:A.t�
0, 0-1,0 Bl ack Loam
1, 0-2, 0 Gray B�n. ;3andy Loam
2. 0-4.0 Brown Loam�� Se,rid
4.0-7, 0 Gr�y Brn. F�ine Sand
7. 0-E�,0 Lt. Brn, Fj.�e 5and, Powdezy
, ia-� .. ,a �.,� 1 ,-,» ..rnfn�. �- -,L.� � _ �� , ..� „
,
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TO: Jeanne Mabusth, Zoning Administrator
FROM: Michael Gaffron, On-Site Systems Manager
DATE: October 30, 1980
SUBJECT: #582 H. R. Johnston, 925 W.illow Drive South - SUBDIVISION
On-Site Systems Review
On October 28 , 1980, I reviewed the five proposed new building sites
for the above referenced subdivision as per the attached survey.
Each lot (save Lot 4 , Block 1 with e�cisting house) appears to have
2. 0 acres of dry buildable land. However, due to proximity to adjacent
wetlands and the accompanying water table a portion of each lot is
unsuitable for use as drainfield. All lots had areas tested which meet
the requirements for standard trench drainfield systems . These designated
tested drainfield areas on certain lots are the only available acceptable
sites for drainfield. In every case, assuming a long term water table
exists at approximately the 930 ' elevation, no drainfield trenches
(2 ' depth standard) should be allowed below elevation 935 ' in order to
ensure a 3 ' separation between trench bottoms and water table. In
addition, where individual lot testing indicates a water table depth,
the above 3' separation must be adhered to. Following is a detailed
review of each lot.
Lot 1, Block 1
Testing indicates soil and water tabZe conditions are suitable for a
standard trench drainfield system. This lot has some alternate house
location possibilities. However, the tested site and in fact the entire
lot should be left undisturbed until a final house location is determined.
Lot 2 , Block 1
As in Lot l, testing found sandy soils suitable for a standard drainfield
system. Various house locations may be possible. An excavation crossing
the lot has not severely damaged drainfield arezs, but no further excavation
or disturbance should be allowed until final house location is determined.
Lot 3, Block 1
This is probably the most critical lot of the subdivision in that a limited
area is available for use as drainfield. The tested area is at the highest
point of the lot due to extreme slopes. An excavation near the northwest
corner of the lot may have affected the extent of the area available for
drainfield. �By creating an outlet for sidehill seepage from trenches above
the excavation. However, due to the extremely fast percolation rates and
sandy soils an the existence of untested but probably suitable area for
drainfield to the east on the lot, the effect of this excavation is only
slight.
.- S�� �°, �
�
T�lIS ITEM �IAS B �
EEH �x�
October 30, �9go MICROfIIMfD
#582 H.R. Johnston •
925 Willow Drive South
Page 2
Lot 3, Block 1 (Cont. )
When this lot is developed, care must be taken to make sure the house
location does not encroach on the area to be preserved for drainfield.
I suggest that for this lot (and for ali subdivisions in the City) that
the tested drainfield sites be somehow entered on the title or deed for
the property so that prospective buyers are made aware of the restriction
on the lot.
Lot 4 , Block 1
This lot contains the existing H. R. Johnston home. Although the lot
as proposed contains only 1. 64 acres, adequate area has been previously
tested and exists for use as future drainfield. A relocation of the lot
line between Lots 3 and 4 to give each property approximately 1. 8 acres
would serve no purpose as far as drainfield sites are concerned.
Lot l, Block 2
The soils on this lot are considerably different than those of the
westerly lots. Loam and clay loam soils are indicated, and the percolation
rates were understandably slower. This lot contains 2. 4 acres and has a
somewhat limited number of possible house locations which would allow a
gravity-flow drainfield system. The lot is acceptable for a standard
trench drainfield. Care must be taken during development of the lot
that drainfield trenches are kept away from the pothole in the center
of the lot.
Lot l, Block 3
This lot has loamy soils with a fairly good percolation rate. The tested
drainfield sites are to the immediate southwest of the existing paved
driveway and due to slop� condi.tions appear to be the only likely sites
for use as drainfield. Again, care must be taken to preclude disruption
of these sites prior to development. It appears that the suggested location
of the house would be on the north end of the lot approximately on the
existing driveway.
Summary
Each of the five proposed new lots should be acceptable for standard trench
drainfield systems. Fortunately, this is one of the few areas of Orono
having sandier soils. Certain lots as indicated may have limiting sites
due to water table and slope constraints. As the engineer' s report states,
it is imperative that the tested sites not be disturbed by further
excavation, grading or filling until permits are issued for specific
house locations. I recommend approval of the subdivision as per preliminary
plan with the above recommendations .
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