|
TABLE H 101.8
LOCATION OF SEWAGE DISPOSAL SYSTEM
MINIMUM HORIZONTAL DISTANCE IN CLEAR
REQUIRED FROM
|
BUILDING SEWER
|
SEPTIC TANK
|
DISPOSAL FIELD
|
SEEPAGE PIT OR CESSPOOL
|
|
Building or structures
|
2 feet
|
5 feet
|
8 feet
|
8 feet
|
|
Property line adjoining private property
|
Clear
|
5 feet
|
5 feet
|
8 feet
|
|
Water supply wells
|
50 feet
|
50 feet
|
100 feet
|
150 feet
|
|
Streams and other bodies of water
|
50 feet
|
50 feet
|
100 feet
|
150 feet
|
|
Trees
|
|
10 feet
|
|
10 feet
|
|
Seepage pits or cesspools
|
|
5 feet
|
5 feet
|
12 feet
|
|
Disposal field
|
|
5 feet
|
4 feet
|
5 feet
|
|
On-site domestic water service line
|
1 foot
s
|
5 feet
|
5 feet
|
5 feet
|
|
Distribution box
|
|
|
5 feet
|
5 feet
|
|
Pressure public water main
|
10 feet
|
10 feet
|
10 feet
|
10 feet
|
For SI units: 1 foot = 304.8 mm
Notes:
Including porches and steps, whether covered or uncovered, breezeways, roofed porte
cocheres, roofed patios, carports, covered walks, covered driveways, and similar structures
or appurtenances.
See Section 312.3.
Drainage piping shall clear domestic water supply wells by not less than 50 feet (15
240 mm). This distance shall be permitted to be reduced to not less than 25 feet (7620
mm) where the drainage piping is constructed of materials approved for use within
a building.
Plus 2 feet (610 mm) for each additional 1 foot (305 mm) of depth in excess of 1 foot
(305 mm) below the bottom of the drain line. (See Section H 6.0)
See Section 720.0.
For parallel construction for crossings, approval by the Health Department shall be
required.
These minimum clear horizontal distances shall also apply between disposal fields,
seepage pits, and the mean high-tide line.
Where disposal fields, seepage pits, or both are installed in sloping ground, the
minimum horizontal distance between any part of the leaching system and ground surface
shall be 15 feet (4572 mm).
Where special hazards are involved, the distance required shall be increased as may
be directed by the Authority Having Jurisdiction.
The septic tank and seepage pit shall not be within the protected zone of an oak tree
as defined by Section 22.56.2060 of Title 22 - Planning and Zoning - of the Los Angeles
County Code.
(Ord. 2016-0055 § 8, 2016: Ord. 2013-0050 § 10, 2013.)
TABLE H 201.1
CAPACITY OF SEPTIC TANKS
1, 2, 3, 4, 5
|
SINGLE-FAMILY DWELLINGS - NUMBER OF BEDROOMS
|
MULTIPLE DWELLING UNITS OR APARTMENTS - ONE BEDROOM EACH
|
OTHER USES: MAXIMUM FIXTURE UNITS SERVED PER TABLE 702.1
|
MINIMUM SEPTIC TANK CAPACITY (gallons)
|
|
1 or 2
|
—
|
15
|
750
|
|
3
|
—
|
20
|
1000
|
|
4
|
2 units
|
25
|
1200
|
|
5 or 6
|
3
|
33
|
1500
|
|
—
|
4
|
45
|
2000
|
|
—
|
5
|
55
|
2250
|
|
—
|
6
|
60
|
2500
|
|
—
|
7
|
70
|
2750
|
|
—
|
8
|
80
|
3000
|
|
—
|
9
|
90
|
3250
|
|
—
|
10
|
100
|
3500
|
For SI units: 1 gallon = 3.785 L
Notes:
1. Extra bedroom, 150 gallons (568 L) each.
2. Extra dwelling units over 10:250 gallons (946 L) each.
3. Extra fixture units over 100, 25 gallons (94.6 L) per fixture unit.
4. Septic tank sizes in this table include sludge storage capacity and the connection
of domestic food waste disposal units without further volume increase.
5. Applies to mobile homes not installed in a mobile home park.
(Ord. 2016-0055 § 9, 2016: Ord. 2013-0050 § 11, 2013.)
TABLE H 201.1(2)
ESTIMATED WASTE SEWAGE FLOW RATES
1, 2
|
TYPE OF OCCUPANCY
|
GALLONS PER DAY
|
|
1.
|
Airports
|
15 per employee
5 per passenger
|
|
2.
|
Auto washers
|
Check with equipment manufacturer
|
|
3.
|
Bowling alleys (snack bar only)
|
75 per lane
|
|
4.
|
Camps:
|
|
|
Campground with central comfort station
|
35 per person
|
|
Campground with flush toilets, no showers
|
25 per person
|
|
Day camps (no meals served)
|
15 per person
|
|
Summer and seasonal
|
50 per person
|
|
5.
|
Churches(Sanctuary)
|
5 per seat
|
|
with kitchen waste
|
7 per seat
|
|
6.
|
Dance halls
|
5 per person
|
|
7.
|
Factories
|
|
|
no showers
|
25 per employee
|
|
with showers
|
35 per employee
|
|
Cafeteria, add
|
5 per employee
|
|
8.
|
Hospitals
|
250 per bed
|
|
kitchen waste only
|
25 per bed
|
|
laundry waste only
|
40 per bed
|
|
9.
|
Hotels (no kitchen waste)
|
60 per bed (2 person)
|
|
10.
|
Institutions (Resident)
|
75 per person
|
|
Nursing home
|
125 per person
|
|
Rest home
|
125 per person
|
|
11.
|
Laundries, self-service
|
|
|
(minimum 10 hours per day)
|
300 per machine
|
|
Commercial
|
Per manufacturer's specifications
|
|
12.
|
Motel
|
50 per bed space
|
|
with kitchen
|
60 per bed space
|
|
13.
|
Offices
|
20 per employee
|
|
14.
|
Parks
|
|
|
Picnic parks (toilets only)
|
20 per parking space
|
|
Recreational vehicles
|
|
|
without water hook-up
|
75 per space
|
|
with water and sewer hook-up
|
100 per space
|
|
15.
|
Restaurants - cafeterias
|
50 per seat
|
|
16.
|
Schools - Staff and office
|
20 per person
|
|
Elementary students
|
15 per person
|
|
Intermediate and high
|
20 per student
|
|
with gym and showers, add
|
5 per student
|
|
with cafeteria, add
|
3 per student
|
|
Boarding, total waste
|
100 per person
|
|
17.
|
Service station, toilets
|
1000 for 1st bay
|
|
|
500 for each additional bay
|
|
18.
|
Stores
|
20 per employee
|
|
Public restrooms, add
|
1 per 10 square feet of floor space
|
|
19.
|
Swimming pools, public
|
10 per person
|
|
20.
|
Theaters, auditoriums
|
5 per seat
|
|
Drive-in
|
10 per space
|
For SI units: 1 square foot = 0.0929 m
, 1 gallon per day 3.785 L/day
Notes:
See Section H 2.1.
Because of the many variables encountered, it is not possible to set absolute values
for waste/sewage flow rates for all situations. The designer should evaluate each
situation and, where figures in this table need modification, they should be made
with the concurrence of the Authority Having Jurisdiction.
(Ord. 2016-0055 § 10, 2016: Ord. 2013-0050 § 12, 2013.)
TABLE H 201.1(3)
DESIGN CRITERIA OF SIX TYPICAL SOILS
|
TYPE OF SOIL
|
REQUIRED SQUARE FEET OF LEACHING AREA PER 100 GALLONS
|
MAXIMUM ABSORPTION CAPACITY IN GALLONS PER SQUARE FEET OF LEACHING AREA FOR A 24 HOUR
PERIOD
|
|
Coarse sand or gravel
|
20
|
5.0
|
|
Fine sand
|
25
|
4.0
|
|
Sandy loam
|
40
|
2.5
|
|
Sandy clay
|
60
|
1.66
|
|
Clay with considerable sand or gravel
|
90
|
1.1
|
|
Clay with small amount of sand or gravel
|
120
|
0.8
|
For SI units: 1 square foot = 0.0929 m
, 1 gallon = 3.785 L, 1 gallon per square foot = 40.7 L/m
(Ord. 2016-0055 § 11, 2016: Ord. 2013-0050 § 13, 2013.)
TABLE H 201.1(4)
LEACHING AREA SIZE BASED ON SEPTIC TANK CAPACITY
|
REQUIRED SQUARE FEET OF LEACHING AREA PER 100 GALLONS SEPTIC TANK CAPACITY (square
feet per 100 gallons)
|
MAXIMUM SEPTIC TANK SIZE ALLOWABLE (gallons)
|
|
20-25
|
7500
|
|
40
|
5000
|
|
60
|
3500
|
|
90
|
3000
|
|
120
|
2500
|
For SI units: 1 square foot per 100 gallons = 0.000245 m
/L, 1 gallon = 3.785 L
|
