HomeMy WebLinkAboutSoils/site evaluation for septic systems � � C�'��' o� ����T�
Post Office Box 66•Crysta!Bay,Minnesota�5323•Municipal Offices
• On the North Shore of Lake Minnetonka
• � • •
SOILS AND SITE EVALUATION FOR SEPTIC SYSTEMS
(IF APPLICABLE)
Determination of site suitability for the use of an on-site sewage
treatment system is one of the most important factors in planning your
home. Soil capabilities, water table depth or seasonally saturated
zones , topography and structure locations must be considered to ensure
a system that will work effectively. IN MOST OF ORONO' S 2 AND 5 ACRE
ZONES ,CITY SEWERS ARE NOT PROJECTED TO BE INSTALLED IN THE FORESEEABLE
FUTURE. Your drainfield must serve you for a Iong time . Orono Code
requires that a minimum of 10 ,Q00 square feet of suitable area be set
aside on your lot for use as drainfield. This will allow suff icient
room for expansion or reconstruction of your drainfield as necessary.
PLEASE READ ALL INSTRUC:ZONS ANO FOLLOFl THEM CAREFULLY:
1. CONTACT AN MPC.1-CERTZFIcD SITE EVALUATOR (LIST AVAZL'1HLE) AND THE ORONO SEPTZC SYSTEM
ZNSPEC:OR. MEET HITH THE24 ON THE SITE TO DISCUSS POSSI3LE LOCaT:0:7S FOR THE HOtJSE,
DRAZNFIELD, AND ACCESSORY STRUCTURES. STA1(E OUT THE PRaPOSED DRAINFIELD SITES.
A. BOTH A PRZHARY AND ALTERNATE (FUTURE) DRAZ:7FIELD SITE MUST HE DELINEATED, EACH
THE APPROXI:SATE EQUIVALE:IT OF 50' X 100' ZN AREA.
B. SEE SACK OF THIS SH£ET FOR SYSTEM LOCATION SETBACZS AND G£NE.4AL REQUIREM£:1T5.
2. AFTER THE DRAZNFZELD LOCITIONS HAVE BEEN SELECTED AND S:AKED, MAXE SOZL HORZYGS AT T3E
APPROXZMATE CORNERS OF EACH DRAZNFZELD SZTE. WHERE SZTES ARE ADJAC�NT, COMMON CORNER
BORINGS ARE 1CCEPTAHLE. THEN, MAKE AT LEAST ONE ADDSTZONAL HORING ZN THE APPROXZMATE
CENTER OF THE SITE � •
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3. BASED ON THE PR£SENCE OR ABSENCE OF LIMITZNG FAC:ORS (SOIL MOTTLZNG, ACTU.IL WATER TABLE,
BEDROCK, OR HEAV7 CLAY LAYERS) ENCOUNTERED IN THE HORINGS, EITHER PROGED WITH
PERCOLATZON TESTS OR MAKE ADDZTZONAL HORINGS UNTZL AN AREA OF ADEQUATE SOIZS AND SZZE
ZS DEFINED, AND RESTAXE AS NECESSARY.
PERCOLATION SOLE DEPTH - FOR TRENCHES: SAME DEPTA AS SOTTOM OF PROPOSED TRENCHES
FdR MOUND: 12'-24' DEPTB
AT LEAST 9 PERCOLATION TEST AOLES ARE REQOZRED FOR EACH SZTE.
4. A SITE PLAN DRAWN TO SCALE SS AEQUIRED. SEE BACX OF THIS SHEET FOR DETAZLS. FA2LURE
• • TO SUHMIT THE PROPER SITE PLAN WILL RESULT ZN DELAYS IN THE REVSEFi PROCESS UNTZL TAE
SZTE PLAN IS SUBMITTED.
5. STAICES TO HE OSED ?O OUTLZNE THE DRAZNFIELD SZTES MUST HE A MZNIMUri OP 2' OUT OF THE
GROUND. THEY MOS? 8E 0! J1 STURDY MATERIAL AND MOST REMAIN SN PLACE IJt1TZL THE SYSTFsI _
H11S HEE2i INSTALLED AND INSPECT�. AHSOLUTELY NO CONSTRUCTZON TRAFFIC OR GRADSNG OP
ANY RSND IS PERMITTED IN TAIS AREA.
IF YO(J HAVE ANY pUES?IONS, OR IF PROBLEMS ARZSE DUAING TESTZNC, PLEASE CRLL FOR ADVICE.
(BUILDING AND ZONING DEPARTMENT - 173-7357)
BUILllING&ZONING—473•7357 � ADNINISTRATION&FINANCE—473•7358 • PUSLIC WORKS —473-7359
ASSESSING
- - 2�
STANDARD REPORT FORMS �ECUIRED: ALL SOIL HORING LOGS, PERCOI.ATION TESTS, AND SYSTE.M DESZGV PROPOS.ILS '
MUST HE REPORTED ON STANDAAD REPORT FORMS (MOST SZTE EVALUATORS CURRENTLY USE THE STINDARD PERCOL 1TION
TEST AND SOIL BORING LOGS1 . THE SITE PLAN MUST 9E ATTACHED, AND THE ENTZRE PACXAGE SUBMITTED FOR
REVIEW AT ONE TIME. PIEC�'lEAL SUBMITTALS WI7.L DELIY PROC�SSI2IG.
NOTE: IF A SITE EVALUATION WAS PERFORMED ON YOUR LOT DURZNG THE SUBDIVISION PROC�SS, THE RESULTS ARE _^
AVAILABLE FROM THE HUSLDING AND 20NING DEPART.`4ENT (473-7357) . YQU *liJST STZLL SUHMZT A SITE PLAN AND
SYSTEM DESIG:1 PROPOSAL.
SZTE PLAN REQUZRE.7ENTS: SIT� PLAN SHOULD BE TO SC1LE (PREFE.RABLY 1" � 20', 40' oL 50') AND MUST
ZNCLUDE THE FOLLOWZNG:
A. ALL PROPERTY LZNES AND LOT �I,SENSZONS.
B. ALL EXISTZ:IG AND PROPOSED STRUCTORES.
C. ALL EXISTZNG AND PROPOSED WELL LOCATIONS AND/OR WATER SUPPLY PIPING.
D. REZ�}1TZVE ELEVATZONS OF HOIISE. LOT CORNERS, TANKS, AND DRAINFIELD SITES.
E. SLOPE OF GROUND AT DRAINFIELD SITES (CONTOUR LINES OR SLOPE DIRECTZON ARROWS AND SLOPE $). '
F. LOCATION OF ALL PERCOLATION TEST HOLES AND SOIL BORINGS, WITH IDENTIFYING SYMBOLS AND
RELATIVE GROUND ELEVATZONS OF EACH. '
G. PRIMARY AND ALTERNATE DRAZNFIELD AREAS ZDENTIFZED.
H. OISTANCE FROM PRZ.'9ARY 11ND ALT�RNAT£ DRAINFZELD AREAS TO PROPERTY LZNES, WELLS, AND ANY
MARSH, LAKE, STREAM, OR DRAINAGc CHANNEL WITHIN 75' OF r1NY PART OF THE SYSTEM.
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GENERAL SEPTZC SYSTEM REOUIRE.MENTS
1. THE TRENCH DRAZNFIELD SYSTEM IS STANDARD AND MUST BE USED WHENE�IER POSSIBLE. MOUND SYSTEMS
MAY BE SUITABLE FOR NEW DEVELOPMENT AND FOR REPIraCE�SENT OF EXISTZNG FAZLZD7G SYSTEMS WFiERE
SZTE CONDZTZONS LIMIT THE USE OF TRENCX SYSTEMS. HED OR WZDE TRENCH SYSTEMS ARE NOT
ALLOWED E:CCEPT AS REPAZRS TO EYZSTI:IG SYSTEl�15 WHERE LOT SIZE SEVERELY LIMITS ALTERNATIVES.
2. SZTE EVALIJATION MUST ZDENTIFY 10,000 SQUARE FEET OF SOILS AND SLOPES SUITABLE FOR DRAIN-
FIELD. THZS IS GENERALLY a LaRGE ENOUGH AREA FOR A PRI.'3ARY AND ALT£RNATE (FUTtJRE) SYSTEM..
3. SLOPES: FOR STANDARD TRENCHES, GROUNDSLOP� MAY NOT EXCEED 18i. FOR SHALLOW TRENCHES,
AND FOR STANDARD TRENCHES WHERE IMPERMEABLE SOIL LAYERS :lAY CAUSE SZDEFiZLL SEEPAGE,
GROUNDSLOPE MAY NOT EXCEED 12�. FOR MOUND SYST£MS, SEE BELOW: y
PERCOLATZON RAT� ALLOWABLE NAJCIMUM SLOPE
1/2 - 5 MPI 6R NOTE: TFiESE ARE COARSE SANDY SOILS; 3' MSN. DEPTH TO WATER TABLE.
5 - 30 MPI 128 MAXZJIUM .
.30 - 60 MPI 6&• MAXI:lUM _ _
� 60 - 120 MPI 3i MAXZMUM
OVER 120 MPI MOUNDS NOT ALLOWED +
4. SEASONAL WATER TAHLE (IDENTZFZED BY SOIL MOTTLING OR ACTUAL WATER, WHICSEVER IS SHALLOWER). �
DEPTH TO SEASONAL W.T.
0' - 2'........................NO SYSTEM ALLOWED
2' - 4'........................MO[JND SYSTEM ALLOWED i
i
4' - 5'........................MOUND OR SHALLOW TRENCHES ALLOWED
5' OR DEEPER...................STANDARD TRENCHES OR MO(JND P,LI.OFIED '�-`
5. PERCOLATION RATE - SYSTEM OPTIONS �
i�
p - �7 MpI,,.......NO SYSTEM ALLOWED; T00 POROZJS FOR TREATMENT
�-•-'�
� - 60 MPI........STANDARD TRENCHES ALLOWED
60 - 90 MPZ........MOUND SYSTEM; FILL TRENCHES MAY HE ALLOWED WHERE ,
WATER TABLE ZS NOT A FACTOR..
90 - 120 MPI.......MOUND SYSTEM ONLY; OVER 120 MPI, NO SYSTEM ALLOWED. ' �"
6. SETBACXS A) SEPTIC TANKS FROM: •
.:�
HOUSE.........................10' MINIMUM; 20' PAEFERRED. '�i�('
FTELL.........................50' MINIMUHt 75' PREFERRED. , `}'
LAKE, STREAM. PIETLAND........75' MZNIMUM `
H) DRAZNFIELD FROM: '�'
HOUSE, DRIVEWAY, PATIO, POOL, TENNIS COUAT, ,'
OTHER HARDCOVER DZSCHARGING TOWARD DRAINFZELD......20' MZNIMUM
. WELL...............................................75' MINIMUM -
LAKEr STREAM. WETLAND..............................75' MINIMUM -'i
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