5.a McGinley holding tank planZIERKE SOIL TESTING
Mark McGinley
21529 St Croix Trl N
Scandia, MN 55073
5/16/2021
Dear Mark McGinley,
At your request, I have prepared a holding tank plan for your cabin on the St Croix
River.
I have designed a holding tank system consisting of two 1500 -gallon septic tanks which
far exceeds the minimum required tank size for your cabin. An audible high-level alarm
will need to be set to trigger when the tanks reach 75% capacity. Given the variable
nature of the soils along the river, your installer may need to install the tanks with less
than two feet of soil cover. If this is the case, extra insulation will need to be added to
ensure the tanks have proper insulation.
Based on the survey sketch provided, the distance from the tanks to the OHWL of the St
Croix river will be 103' which is short of the required set back distance. A variance will
need to be granted to allow the tanks to be installed this close to the river.
Sincerely,
Benjamin Zierke
MPCA Lic 119, Cert 9594
ADDRESS:
28587 Jeffrey Ave
Chisago City, MN 55013
PHONE 651-249-1346
EMAIL benzierke@gmail.com
Preliminary
MINNESOTA POLLUTION
Evaluation Worksheet CONTROL AGENCY
1. Contact Information v 04.01.2020
Property Owner/Client: Mark McGinley Date Completed: 5/16/2021
Site Address: 21529 St Croix Tri N Scandia, MN 55073 1 Project ID:
Email: mcginleyl94@frontiernet.net Phone:
Mailing Address: 14600 Ostrum Trail Marine on St Croix, MN 55047
Legal Description:
Parcel ID: 18.032.19.13.0002 SEC: TWP: E-771 RNG:
2. Flow and General System Information
A. Client -Provided Information
Project Type: ❑ New Construction ❑ Replacement 0 Expansion ❑ Repair
Project Use: 0 Residential ❑ Other Establishment:
Residential use: # Bedrooms: Dwelling Sq.ft.: Unfinished Sq. Ft.:�
# Adults: # Children: # Teenagers:
In-home business (Y/N): If yes, describe:
❑ Garbage Disposal/Grinder ❑ Dishwasher ❑ Hot Tub*
Water -using devices: ❑ Sewage pump in basement ❑ water Softener* ❑ Sump Pump*
(check all that apply) ❑ Large Bathtub >40 gallons ❑ Iron Rlter* ❑ Self -Cleaning Humidifier*
❑ Clothes Washing Machine ❑ High Eff. Furnace* ❑ Other:
" Clear water source - should not go into system
Additional current or future uses:
Anticipated non-domestic waste:
The above is complete ft accurate:
Client signature It date
B. Designer -determined flow Information Attach additional information as necessary.
Design Flow: 300 GPD Anticipated Waste Type: I Residential
BOD: <170 mg/L TSS Ei60 ing/L Oil Et Grease <25 mg/L
3. Preliminary Site Information
A. Water Supply Wells
Well Depth
Casing
Confining
STA
#
Description
Mn. ID#
(ft.)
Depth (ft.)
Layer
Setback
Source
1
Shallow
100'
Homeowner
2
3
4
Additional Well Information:
Preliminary
�1�1� MINNESOTA POLLUTION
Evaluation Worksheet � l � CONTROL AGENCY
Site within 200' of noncommunity transient well (Y/N) Yes, source:
Site within a drinking water supply management area (Y/N) I "_� Yes, source:
Site in Well Head Protection inner wellhead management zone (Y/N) L.� Yes, source:
Buried water supply pipes within 50 ft of proposed system (Y/N)
B. Site located in a shoreland district/area? Yes, name: St Croix River
Elevation of ordinary high water level: 680 ft Source: Survey
Classification: st Croix River Overlay Distric Tank Setback: 200 ft. STA Setbk: 2DD ft.
C. Site located in a floodplain? No Yes, Type(s): Zone X
Floodplain designation/elevation (10 Year): N/A ft Source: N/A
Floodplain designation/ elevation (100 Year): N/A ft Source: N/A
D. Property Line Id / Source: 2 Owner 2 Survey ❑ County GIS ❑ Plat Map ❑ Other:
E. ID distance of relevant setbacks on map: E Water ❑ Easements Ej Well(s)
❑ Building(s) 0 Property Lines ❑ OHWL ❑ Other:
4. Preliminary Soil Profile Information From Web Soil Survey (attach map ft desorption)
Map Units: 329 Chaska Silt Loam Slope Range: 0-10 %
List landforms: Flood Plains
Landform position(s): back/side, toe
Parent materials: Alluvium
Depth to Bedrock/ Restrictive Feature:in Depth to Watertable: E= in
Septic Tank Absorption Field- At -grade:
Map Unit
Ratings Septic Tank Absorption Field- Mound:
Septic Tank Absorption Field- Trench:
1 5. Local Government Unit Information
Name of LGU: Washington County
LGU Contact: 651-430-6000
LGU-specific setbacks: 75' wetland
LGU-specific design requirements:
LGU-specific installation requirements:
Notes:
POLLUTION
Design Summary Page CONTROL AG NCY m "=
1. PROJECT INFORMATION v 04.01.2020 E
Property Owner/Client: Mark McGinley Project ID:
Site Address: 21529 St Croix Trl N Scandia, MN 55073 Date: 05/16/21
Email Address: mcginley194@frontiernet.net Phone:
1 2. DESIGN FLOW Et WASTE STRENGTH Attach data / estimate basis for Other Establishments
Design Flow: 300 GPD Anticipated Waste Type: Residential
BOD: <170 mg/L TSS: <60 mg/L Oil Et Grease: <25 mg/L
Treatment Level:Select Treatment Level C for residential septic tank effluent
3. HOLDING TANK SIZING
Minimum Capacity: Residential =400 gal/bedroom, Other Establishment = Design Flow x 5.0, Minimum size 1000 gallons
Code Minimum Holding Tank Capacity: 1200 Gallons in Tanks or Compartments
Recommended Holding Tank Capacity: 3000 Gallons in Tanks or Compartments
Type of High Level Alarm: Audible (Set @ 75% tank capacity)
Comments:
4. SEPTIC TANK SIZING
A. Residential dwellings:
Number of Bedrooms (Residential): u
Code Minimum Septic Tank Capacity:Gallons
Recommended Septic Tank Capacity:Gallons
Effluent Screen Et Alarm (Y/N): Mo
B. Other Establishments:
in Tanks or Compartments
in Tanks or Compartments
del/Type:
Waste received by: 0 GPD x =Days Hyd. Retention Time
Code Minimum Septic Tank Capacity:Gallons In Tanks or Compartments
Recommended Septic Tank Capacity:Gallons In Tanks or Compartments
Effluent Screen It Alarm (Y/ N): Model/Type:
5. PUMP TANK SIZING
Pump Tank 1 Capacity (Minimum):Gat
Pump Tank 1 Capacity (Recommended):Gat
Pump 1 GPM Total Head ft
Pump Tank 2 Capacity (Minimum):Gal
Pump Tank 2 Capacity (Recommended):Gat
Pump 2GPM Total Head]ft
Supply Pipe Dia. in Dose Vol: gal Supply Pipe Dia. Dose Vol:! _ Gal
MINNESOTA POLLUTION
Design Summary Page M9 CONTROL AGENCY
I 6. SYSTEM AND DISTRIBUTION TYPE Project ID: i
Soil Treatment Type: Distribution Type:
Elevation Benchmark: ft Benchmark Location:
MPCA System Type: Distribution Media:
Type III/IV Details:
1 7. SITE EVALUATION SUMMARY: I
1 8. SOIL TREATMENT AREA DESIGN SUMMARY 1
Trench:
Dispersal Areaft2 Sidewall Depthin Trench Widthft
Tot -al Lineal Feetft No. of Trenches Code Max. Trench Depthin
Contour Loading Rateft Lengthft Designed Trench Depthin
Bed:
Dispersal Areaft' Sidewall Depthin Maximum Bed Depthin
Bed Width=ft Bed Length[=ft Designed Bed DepthF77:1in
Mound:
Dispersal Areaft
Absorption Widthft
Upslope Berm Widthft
Total System Lengthft
Bed Lengthft
Clean Sand Lift ft
Downslope Berm It
System Widthft
Bed Widthft
Berm Width (0-1%)ft
Endslope Berm Widthft
Contour Loading Rategal/ft
Describe Limiting Condition:
j
3
Layers with >35% Rock Fragments? (yes/no)= If yes, describe below: % rock and layer thickness, amount of
soil credit and any additional information for addressing the rock fragments in this design.
Mote:
Depth
Depth Elevation of Limiting Condition =
Limiting Condition:inches
Elft ft
Minimum Req'd Separation: inchesE71ft
Elevation Critical for system compliance
i
Code Max System Depth:inches
ft ft
This is the maximimum depth to the bottom of the distribution
media for required separation. Negative Depth (ft) means it must be a mound.
Soil Texture:
Soil Hyd. Loading Rate:GPD/ft2
Percolation Rate:MPI
Contour Loading Rater
Note:
Measured Land Slope: 4.0 %
Note:
Comments:
1 8. SOIL TREATMENT AREA DESIGN SUMMARY 1
Trench:
Dispersal Areaft2 Sidewall Depthin Trench Widthft
Tot -al Lineal Feetft No. of Trenches Code Max. Trench Depthin
Contour Loading Rateft Lengthft Designed Trench Depthin
Bed:
Dispersal Areaft' Sidewall Depthin Maximum Bed Depthin
Bed Width=ft Bed Length[=ft Designed Bed DepthF77:1in
Mound:
Dispersal Areaft
Absorption Widthft
Upslope Berm Widthft
Total System Lengthft
Bed Lengthft
Clean Sand Lift ft
Downslope Berm It
System Widthft
Bed Widthft
Berm Width (0-1%)ft
Endslope Berm Widthft
Contour Loading Rategal/ft
now Design Summary Page
PRrjc,PAc:
MINNESOTA POLLUTION
.CONTROL AGENCY
Bed Widthft Bed Lengthft Finished Heightft
Contour Loading Rategal/ft Upslope Bermft Downslope Bermft
Endslope Berm E-71ft System Length E--:71 ft System Width E=ft
Level It Equal Pressure Distribution
No. of Laterals Perforation Spacing(I Perforation Diameterin
Lateral Diameterin Min Dose VolurneF----]oat Max Dose Volume= gat
Non -Level
Lateral 1
Lateral 2
Lateral 3
Lateral 4
Lateral 5
Lateral 6
and Unequal
Pressure Distribution
Length (ft)
(in)
(ft)
(in)
Minimum Dose
Volume
i ga l
Maximum Dose
Volume
E= gat
Elevation
Pipe Size
Pipe
Pipe
Perf Size
Spacing
Spacing
(ft)
I hereby certify that I have completed this work in accordance with all applicable ordinances, rules and laws.
n
Benjamin Zierke j 1197
(in)
Volume
(gal/ft)
Length (ft)
(in)
(ft)
(in)
9. Additional Info for At -Risk, HSW or Type IV Design
A. Starting BOD Concentration = Design Flow X Starting BOD (mg/L) X 8.35 : 1,000,000
�gpd X �mg/L X 8.35 : 1,000,00, = lbs. BOD/day
B. Target BOD Concentration = Design Flow X Target BOD (mg/L) X 8.35 _ 1,000,000
�gpd X �mg/L X 8.35 : 1,000,00 = lbs. BOD/day
Lbs. BOD To Be Removed: L.J
PreTreatment Technology: "Must Meet or Exceed Target
Disinfection Technology: "Required for Levels A £t B
C. Organic Loading to Soil Treatment Area:
=mg/L X =gpd x 8.35 : 1,000,000: �ftz _ =lbs./day/W
10. Comments/Special Design Considerations:
Install holding tanks as shown on sketch. If tanks have less than two feet of soil cover, add insulation. Ejector pump in
cabin may be used to pump waste to tanks.
5/16/2021
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Soil Map—Washington County, Minnesota
51840 518540 518580 518680 518600 51%W Siam
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Conservation Service National Cooperative Soil Survey Page 1 of 3
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Soil Map—Washington County, Minnesota
Map Unit Legend
Map Unit Symbol Map Unit Name Acres In AOI Percent of AOI
329 Chaska silt loam 2.2 78.8%
1820F Mahtomedi variant -Rock 0.6 21.2%
outcrop complex, 25 to 60
percent slopes
Totals for Area of Interest 2.8 100.0%
uSDA Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5/16/2021
Page 3 of 3