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604.1 General
The minimum required soil absorption system area for all occupancies, except one- and two-family dwellings, shall be based on building usage, the percolation rate and system design in accordance with Tables 604.1(1) and 604.1(2). The minimum soil absorption area shall be calculated by the following equation:
(Equation 6-1)
where:
A = Minimum system absorption area.
AA = Absorption area from Table 604.1(1).
CF = Conversion factor from Table 604.1(2).
U = Number of units.
MINIMUM ABSORPTION AREA FOR OTHER THAN ONE- AND TWO-FAMILY DWELLINGS
PERCOLATION
CLASS
PERCOLATION RATE
(minutes required for
water to fall 1 inch)
SEEPAGE
TRENCHES
OR PITS
(square feet
per unit)
SEEPAGE
BEDS (square
feet per unit)
10 to less than 10110140
210 to less than 30165205
330 to less than 45220250
445 to 60220280
For SI: 1 minute per inch = 2.4 s/mm, 1 square foot = 0.0929 m2.
CONVERSION FACTOR
BUILDING CLASSIFICATIONUNITSFACTOR
Apartment building1 per bedroom1.5
Assembly hall—no kitchen1 per person0.02
Auto washer (service buildings, etc.)1 per machine6.0
Bar and cocktail lounge1 per patron space0.2
Beauty salon1 per station2.4
Bowling center1 per bowling lane2.5
Bowling center with bar1 per bowling lane4.5
Camp, day and night1 per person0.45
Camp, day use only1 per person0.2
Campground and camping resort1 per camping space0.9
Campground and sanitary dump station1 per camping space0.085
Car wash1 per car1.0
Catch basin—garages, motor-fuel-dispensing facility, etc.1 per basin2.0
Catch basin—truck wash1 per truck5.0
Church—no kitchen1 per person0.04
Church—with kitchen1 per person0.09
Condominium1 per bedroom1.5
Dance hall1 per person0.06
Dining hall—kitchen and toilet1 per meal served0.2
Dining hall—kitchen and toilet waste with dishwasher or food waste grinder or both1 per meal served0.25
Dining hall—kitchen only1 per meal served0.06
Drive-in restaurant, inside seating1 per seat0.3
Drive-in restaurant, without inside seating1 per car space0.3
Drive-in theater1 per car space0.1
Employees—in all buildings1 per person0.4
Floor drain1 per drain1.0
Hospital1 per bed space2.0
Hotel or motel and tourist rooming house1 per room0.9
Labor camp—central bathhouse1 per employee0.25
Medical office buildings, clinics and dental offices
Doctors, nurses and medical staff
Office personnel
Patients
1 per person
1 per person
1 per person
0.8
0.25
0.15
Mobile home park1 per mobile home site3.0
Motor-fuel-dispensing facility1 per car served0.15
Nursing or group homes1 per bed space1.0
Outdoor sports facility—toilet waste only1 per person0.35
Park—showers and toilets1 per acre8.0
Park—toilet waste only1 per acre4.0
Restaurant—dishwasher or food waste grinder or both1 per seating space0.15
Restaurant—kitchen and toilet1 per seating space0.6
Restaurant—kitchen waste only1 per seating space0.18
Restaurant—toilet waste only1 per seating space0.42
Restaurant—(24-hour) kitchen and toilet1 per seating space1.2
Restaurant—(24-hour) with dishwasher or food waste grinder or both1 per seating space1.5
Retail store1 per customer0.03
School—meals and showers1 per classroom8.0
School—meals served or showers1 per classroom6.7
School—no meals, no showers1 per classroom5.0
Self-service laundry—toilet waste only1 per machine1.0
Showers—public1 per shower0.3
Swimming pool bathhouse1 per person0.2

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