SECTION 1.
Authority and Purpose
1.1 The following RULES AND REGULATIONS
PERTAINING TO DRIP DISPERSAL SYSTEMS are duly adopted and promulgated by the
Arkansas State Board of Health pursuant to the authority expressly conferred by
the laws of the State of Arkansas including, without limitation. Act 96 of 1913
(A.C. A. {
20-7-109
}, and Act 402 of 1977 (A.C.A. {
14-236-101 } et.
Seq.).
1.2 Purpose: A drip
dispersal system is a technology for the distribution of treated wastewater
uniformly over a large area beneath the soil surface. Drip Dispersal fields are
a "bed" design. The use of four (4) to six (6) inch installation cover does not
fit the conventional trench design criteria utilized in the Onsite Wastewater
Soil Morphology Program for system design.
SECTION 2.
Definitions
2.1
Aerobic Treatment Unit (ATU): A mechanical on-site treatment unit that
provides secondary wastewater treatment by mixing air and aerobic and
facultative microbes with the wastewater. ATU's typically use a suspended
growth treatment process or a fixed treatment process.
2.2
Air/Vacuum (A/V) Relief Valve;
A valve that automatically lets air out of or into liquid carrying pipe
as needed in response to changes in system pressure.
2.3
Aerobic: Having molecular
oxygen as a part of the environment, or growing or occurring only in the
presence of molecular oxygen.
2.4
Backwash: The process of flow reversal to clean a filter and to
restore it to the normal clean condition for filtering with a minimum
resistance to flow through the media or screen.
2.5
Control Panel: An electronic
control panel that controls the quantity and time of dose. This can also
control the zone receiving the effluent, automatically flushes the lines,
flushes the filters, monitors the flow rates and pump run cycles or
times,
2.6
Decentralized
System: An onsite and/or cluster wastewater system used to treat and
disperse or discharge small volumes of wastewater, generally from dwellings or
businesses that are located relatively close together.
2.7
Disk Filter: A type of
filter that utilizes a series of grooved rings that overlay each other to form
a network of very small openings to trap contaminants.
2.8
Distributing Valve: A valve
that distributes flow to multiple drain field laterals, zones or locations by
automatically rotating upon each pump cycle.
2.9
Drain-back: The process of
effluent draining along the laterals and manifolds after the pump shuts off.
Drainage occurs both inside and outside the drip tubing and manifolds to lower
elevations in the drip field.
2.10
Drip Line: Tubing constructed from polyethylene with emitters
embedded regularly along the length of the tube.
2.11
Effluent: Sewage, water or
other liquids, partially or completely treated or in its natural state flowing
out of a septic tank, aerobic treatment unit, or other treatment system or
systems.
2.12
Emitters:
Small diameter openings in drip line that can dissipate pressure and
allow a slow, controlled discharge normally rated in gallons per
hour.
2.13
Field Flush:
Water is passed through the drip lateral for the purpose of removing
particles and other debris from the walls of the drip tubing. The flush water
is carried back through the return manifold and return line to the pretreatment
unit.
2.14
Filter: A
device for the main purpose of removing suspended solids and other debris from
the wastewater.
2.15
Hydraulic Conductivity: The rate of water movement under unit
gradient in a specific soil horizon.
2.16
Interceptor Drain: A
subsurface drain line, usually constructed upgrade from the absorption area to
divert seasonal groundwater.
2.17
Lateral: One single run or multiple runs of drip tubing connected
atone end to a supply manifold and the other end connected to a return
manifold.
2.18
Maintenance
Personnel; An individual certified by the Department to conduct
assessments under the Onsite Maintenance and Monitoring Program.
2.19
Monitoring: Periodic
inspection of system for performance.
2.20
Pressure Compensating (pc)
Emitters: Drip emitters that allow a constant flow or discharge over a
wide range of applied pressure.
2.21
Pressure Distribution: A
system of small diameter pipes equally distributing effluent through a trench
or bed.
2.22
Pressure
Regulator: A device used to regulate and maintain a constant discharge
pressure.
2.23
Pretreatment:
The conditioning of effluent prior to dispersal by a drip
system.
2.24
Return Line:
The return line connects the return manifold to the pretreatment unit
for the purpose of carrying flush water from the drip field.
2.25
Return Manifold: A
collection manifold or piping that returns excessive wastewater and debris to
the primary treatment tank during system flushes.
2.26
Run: One continuous length
of tubing routed across contour connected to a supply line or return line or
another run.
2.27
Soil
Structure: The combination or arrangement of individual soil particles
in definable aggregates, or peds, which are characterized and classified on the
basis of size, shape, and degree of distinctness.
2.28
Solenoid Valve: An electric
valve actuated by a solenoid, used for controlling the flow or liquid in
pipes.
2.29
Spin Filter:
A filter that consist of a screen cylinder enclose in a casing. The
typical filter screen mesh size is 150 and a micron rating of 100.
2.30
Static Plow: A drip line
plow with a shank that remains at a given depth as the plow is pulled through
the soil.
2.31
Supply Line:
The line that extends from the pump to the supply manifold of a given
zone.
2.32
Supply Manifold:
The supply manifold connects the supply line to the drip
laterals.
2.33
Vertical
Separation: The depth of unsaturated, original, undisturbed soil between
the bottom of the drip tubing and highest seasonal water table or restrictive
layer.
2.34
Vibratory Plow:
A vibratory plow is a drip line plow with a shank that vibrates
vertically as the plow is pulled through the soil.
2.35
Water Table: The level in
saturated soil at which the hydraulic pressure is zero.
2.36
Zone: A group of laterals
that are dosed at the same time.
SECTION 3.
Site
Assessment
3.1 Subsurface
Drip System(s) may be utilized on sites that meet the following criteria
3.1.1 The minimum vertical separation between
the drip tubing or installed trench bottom and any rock substrata (consolidated
or fractured) shall be nine (9) inches or greater of undisturbed, natural
soil.
3.1. 2 The drip
tubing or installed trench bottom shall be above the seasonal water table,
whatever the duration. Brief seasonal water tables may be minimized or
eliminated by the use of effective interceptor drains. Any design, which
incorporates the use of an interceptor drain, shall indicate the effective
depth of seasonal water table reduction.
3.1.3 The percent clay of a soil may be
interpreted as a Seasonal Water Table Class Clay percentage, as it relates to
seasonal water table interpretation, is sited in Section 8 of the Onsite
Wastewater Regulations.
3.1.4 Soils
that are structure less or with massive structure shall not be approved for
onsite sub-surface treatment.
3.1.5
The iot size shall be of sufficient area to accommodate both the primary and
secondary dispersal area. Both the primary and secondary dispersal area shall
be sized according to the respective loading rates. If the lot can only support
the primary dispersal field, a subsurface drip dispersal system shall not be
installed. For lots three (3) acres or greater, the use of a surface discharge
drip system may be considered. (See Surface Discharge Systems)
SECTION 4.
Drip
Tubing and Emitters
4.1
Emitter spacing can range from six (6) to twenty-four (24) inches. The emitters
used in the tubing shall be pressure compensating. Pressure compensating
emitters have a relatively constant discharge rate over a wide range of
pressures. Emitter flow rate shall be specified by the designer and stated on
the system plans. The drip line pressure can range from 5 to 70 pounds per
square inch (PSI).
4.2 Drip tubing
shall be installed by one of the following methods: static plow, chain trencher
or vibratory plow.
4.3 Static plow
is the preferred method for inserting drip tubing into the soil. The static
plow shall be pulled not pushed through the soil.
4.4 Chain trencher may be used for placement
of the drip tubing in the soil. The maximum chain trench width is four (4)
inches.
4.5 Wet soil shall not be
plowed because of smearing.
4.6
Drip tubing installed in natural soil shall be installed to a depth of six (6)
inches.
4.7 If capping fill
material is used as part or all of the cover over the tubing, the installed
depth of the tubing can range from one (1) to five (5) inches in the natural
soil. Drip tubing shall not be placed in the capping fill material, (n no case
shall the cover over the tubing be less than six (6) inches.
4.8 Settled depth of the cap shall not be
more than eight (8) inches. The capping fill material shall not contain more
than 27% clay or 60% sand or 70% silt. Before the capping fill material is
delivered to the proposed dispersal site, a textural analysis shall be
provided. A credit of up to 50% of the settled cap depth may be allowed in the
adjustment of the seasonal water table. The seasonal water table credit is at
the sole discretion of the Department.
SECTION 5.
Pretreatment
Requirements
5.1 The
quality of effluent that will be applied to the dispersal field shall meet the
American National Standards Institute/National Sanitation Foundation (ANSI/NSF)
Standard 40 (revised 2005) requirements for class 1 treatment systems. Only
pretreatment units that have obtained approval from the Department shall be
used.
5.2 Pretreatment system shall
be required as part of any Drip Dispersal System design.
5.3 The daily flow rate capacity of a
pretreatment system shall equal or exceed the daily flow rates found in
Appendix A.
5.4 Pretreatment
systems installed in conjunction with an individual residential structure shall
have a daily flow rate capacity of not less than 400 gallon per day.
5.5 Pretreatment systems installation on
non-residential or multi-structures shall be sized according to influent
wastewater strength and total daily flow rate expressed in gallons per
day.
SECTION 6.
Filters and Screens
6.1 There are three types of filters or
screens used for wastewater applications: spin or screen filter, disk, and
sand.
6.2 Solids and other debris
shall be filtered to a size of 100 microns or less.
6.3 Filter debris shall be returned to the
septic tank, pretreatment unit, or a separate settling tank regardless of the
type of filter system. The clear Schedule 40 PVC piping allows for a direct
observation of the wastewater as it flows from the fijter flush line or the
field flush line.
SECTION
7.
Control Panel
7.1 Timed dosing is the only method for
controlling the dose cycles and volumes.
7.2 Control panels shall be constructed of
the following basic components: NEMA 4X rated enclosure, motor-start
contractors, separate circuit breakers for pump and panel control, audio and
visual alarms, and wiring terminals. Optional components range from elapsed
time meter or counters, event counters and pump run lights.
SECTION 8.
Flow
Meters and Pressure Gauges
8.1 A flow meter shall be installed after the
filter system but before the drip dispersal field. The flow meter shall
incorporate not only a rate of flow gauge but also a total gallons pumped
register. The flow rate gauge and total gallons pumped register may be separate
devices. The flow meter shall be installed in a protective box that will be of
sufficient size for servicing the meter and to allow easy access for reading
the meter. The flow meter shall be sized for the dispersal flow as well as the
additional field flushing volume.
8.2 Pressure gauges shall be located before
the filter, after the filter and on the dispersal field return line. Pressure
gauges shall be enclosed in the head works box, which allows easy access for
observation. The gauges shall be liquid filled and a minimum of three (3)
inches in diameter. The pressure range of the gauge shall be sufficient for the
maximum pressure that will be expected in the system.
SECTION 9.
Supply Line and
Manifold
9.1 The supply
line and manifold should be designed with a flow velocity between the 0.5 feet
per and 5 feet per second.
9.2 The
piping and fittings in the supply line and the manifold shall be Schedule 40.
Schedule 80 fittings shall be used at the filter system as well as any point
where the piping will be disconnected or subjected to abuse.
9.3 When dosing, the supply manifold shall
eliminate the drain back potential from a higher to a lower elevation in the
drain field.
SECTION 10.
Return Manifold and Line
10.1 The return manifold and line allow the
flushing of the drip dispersal field. The flushed wastewater and solids shall
be returned back to the settling tank or treatment tank.
SECTION 11.
Flexible Hose
and Tubing
11.1 Flexible
Schedule 40 PVC piping shall be used at all connections to the supply and
return manifolds.
SECTION
12.
Air/Vacuum Relief
Valves
12.1 Air/vacuum
relief valves provide a means for releasing air at the start of a dose cycle,
so the system will charge quickly with wastewater and allow air to enter the
system quickly at the end of dose cycle. Air/vacuum valves shall be located at
the highest points of either supply or return manifolds, or both.
12.2 Air/vacuum relief valves shall be sized
based on the proposed design flow rate. A valve that is under sized will not
provide an adequate amount of airflow,
12.3 A Schrader valve shall be provided at
each vacuum valve as a means of checking the pressure of the drip
field.
SECTION 13.
Flushing Valves
13.1 Automatic flushing controls shall be
required for all drip systems. The flush valve shall be a solenoid type valve.
Manual flushing valves may be installed in the field flush line. Manually
operated valves may be standard ball or gate valves. The flush valve shall be
fully opened during a flush cycle regardless of the valve type. The field
flushing velocity shall be in accordance with the drip tubing or system
manufacturer's recommendations. The minimum field flushing velocity shall not
be less than 0.5 feet per second.
SECTION 14.
Pipe and
Specialty Connectors and Fittings Standard
14.1 PVC pipe, tubing, reducer tees,
adapters, elbows, couplers and compression fittings shall be constructed of
Schedule 40 PVC.
14.2 Lock-Slip
fittings, adapters, tees, elbows, and couplings shall be specifically
manufactured for use with wastewater drip dispersal systems.
14.3 Insert Fittings, barbed adapters, tees,
elbows, and couplings shall be specifically manufactured and sized for use with
wastewater drip dispersal system.
SECTION 15.
Headworks
Boxes
15.1 Any component
or assembly that may need to be routinely serviced shall be located in a
headworks box that is readily accessible.
15.2 Headworks boxes may be constructed of
high-density PE (polyethylene) fiberglass, PVC, or concrete.
15.3 Headworks boxes shall be large enough to
allow ease of service and allow periodic removal and replacement of components
as needed. The headworks box shall be of sufficient length and depth to
accommodate the various components that will be housed in the box. The lid of
the headworks box shall extend above the finished grade. The bottom of the
headworks box shall be designed to drain any rainwater or wastewater away from
the inside of the box. The headworks box lid shall be easy to remove but also
shall be made tamperproof where access to the site is not restricted or
controlled. The structural strength of the headworks box and lid shall be
sufficient to withstand the weight of any lawn maintenance equipment or other
service equipment that may roll over the box. If the box will be subject to
excessive wheel loading, additional protection shall be provided.
SECTION 16.
Zones and Related Components
16.1 Automatic distributing valves shall
include clear Schedule 40 piping on the output of each zone.
16.2 Check valves, shall not be required if
separate return lines are used to isolate returned wastewater to the
pretreatment system.
SECTION
17.
Pressure Regulators
17.1 Regulators shall be selected to allow
sufficient pressure and flows for flushing. Pressure regulators shall be
designed for use in wastewater drip dispersal system.
SECTION 18.
System
Installation
18.1 Protect
the site prior to and after the installation of the drip system. Activities on
the site shall be limited only to what is necessary for the installation of the
system.
18.2 Any clearing or
grubbing shall be performed based on a site-specific plan, which minimizes the
disturbance of the soil and protects the overall soil characteristics. It may
be necessary to use flexible PVC tubing to work around or over objects in the
dispersal field; however the number of emitters shall not be reduced.
18.3 Drip tubing shall not be installed when
the soil is wet or frozen.
18.4
Drip tubing shall be installed on contour.
18.5 Flexible Schedule 40 PVC tubing shall be
used at each manifold connection to provide additional crimping protection and
to prevent the tubing from being pulled out of the supply or return manifold as
the soil settles.
18.6 Drip tubing
shall be taped, or plugged or capped when cut. All piping shall be taped or
capped at the end of the construction day.
18.7 PVC pipe cutters that cleanly shear the
pipe or tubing shall be used rather than sawing the pipe or tubing.
18.8 Complete flushing of the supply line
prior to the connection of the drip tubing shall be performed. Sufficient
volume of water shall be used to ensure all debris is removed from both the
supply line and the drip tubing.
18.9 A start-up system check shall be
performed before the system is placed in operation. All operational functions
that would be expected during routine operations shall be performed in a
specified time period of not less than 24 hours. This operational test shall
include but not be limited to: timed dose functions, volume loading, flow
rates, pressures at the inlet and outlet of each zone, pressures at the inlet
and outlet of filters, leak detection, flushing, and alarms.
18.10 Repairs or modifications shall be made
to eliminate any wet spot.
18.11
The establishment of a vegetative cover is critical to the overall performance
of a drip dispersal system. The dispersal area shall be covered with sod or
mulch as soon as possible after the installation of the drip tubing.
SECTION 19.
System Operation and Maintenance
19.1 Periodic servicing shall be required.
The frequency of the service period is dependent on the operational parameters
set for the system by its designer. The minimal service period shall not be
less than once every three (3) months.
19.2 Alarms resulting from mechanical break
downs shall be investigated and the situation causing the alarm
resolved.
19.3 Owners of Drip
Dispersal Systems are required to maintain a Maintenance and Monitoring
Contract with Maintenance Personnel certified by the Department for the life of
the system.
SECTION 20.
System Design
20.1 The following procedure shall be used to
determine the minimum surface area required for drip dispersal
system.
20.2 The depth and duration
of the seasonal water table shall be determined.
20.3 The sizing or loading rate chart found
in Table 1 of this manual shall be used to determine the amount of surface area
required for installation.
20.4 The
spacing between drip tube laterals shall not be less than two (2) ft. center to
center. Drip tube laterals spacing may be greater than two (2) ft, however, for
the purpose of determining the length of tubing required for a dispersal field,
all length calculation shall be two (2) ft. center to center.
20.5 The effective area of the dispersal
field shall be calculated by dividing the daily wastewater flow rate (DWF) in
gallons per day (gpd).by the soil loading rate (SLR) in gallons per foot square
per day (g/ft ft2/d). [Area of the dispersal field
(DF) = design wastewater flow (DWF)t soil loading rate (SLR).]
20.6 The length of the drip tubing shall be
determined by dividing the dispersal field (DF) required by the drip tube
spacing (DT) of two (2) Ft. [Drip tube length (DTL = dispersal field area (DF)
*** drip tube spacing (DT) of two (2) ft.]
20.7 The number of emitters required shall be
determined by dividing the drip tube length (DTL) by the emitter spacing (E)
ft. [Drip line lateral length (ft.) -r emitter spacing (ft.) = Number of
emitters.]
20.8 The loading rate
for a soil which has a rock substrata (consolidated or fractured) and no
seasonal water tables present above the rock substrata shall be sized as a
moderate seasonal water table.
SECTION 21.
Training and
Certification
21.1 All
Designated Representatives, Installers, Environmental Health Specialists, and
Certified Maintenance Personnel shall be certified in the design, construction
and maintenance of a drip dispersal system. The certification program will be
provided or approved by the Department Onsite Wastewater Section.
SECTION 22.
Surface Discharge Drip System
22.1 Under certain conditions, Drip Dispersal
Systems may be approved as a surface discharge system.
22.2 The requirements for surface discharge
are:
22.2.1. The site is unsuited for a
subsurface drip dispersal system.
22.2.2. Pre-treatment shall be a Class 1
treatment unit as approved by the Department. (See Section 5 Pretreatment
Requirements)
22.2.3 Lot size shall
not be less than three (3) acres. The lot size shall not include road or
highway right of ways or utility easements.
22.2.4. A one hundred (100) foot setback from
any property lines shall be maintained in all directions from the drip
dispersal field.
22.2.5. A maximum
loading rate of 0,09 gallons per square foot per day shall be
utilized.
22.2.6. Ultraviolet light
disinfection units shall be used as the primary method of disinfection.
Ultraviolet light (UV) units shall be approved by the Department. UV units
shall be installed and maintained in accordance with manufacturers recommended
practices.
SECTION
23.
Variances and
Exemptions
23.1 Requested
variations from these Rules and Regulations will be considered and may be
approved at the sole discretion of the Department.
23.2 Submission of proposed experimental
onsite wastewater systems may be approved, disapproved, or approved on a trial
basis for a specific period of time. Such approval or disapproval shall be at
the sole discretion of the Department. Submission of an experimental design
shall include data as to the efficiency of operation of the proposed
experimental system. A monitoring plan shall be submitted for approval in
addition to the system design,
23.3
Good management practices are additions or modifications to systems which will
make such systems more efficient, or which could make such systems acceptable
in certain soil conditions. Where good management practices are proposed for
inclusion in a drip dispersal system, approval shall be at the sole discretion
of the Department or its Authorized Agent.
SECTION 24.
Fees
24.1 A fee shall be
levied for the review of individual drip dispersal system permit application
pursuant to A. C. A. §
14-236-116.
24.2 For structures one thousand
five hundred square feet (1,500 sq. ft.) or less, the fee to review a permit
application is thirty dollars ($30.00).
24.3 For structures more than one thousand
five hundred square feet (1,500 sq. ft.) and less than two thousand square feet
(2,000 sq. ft.), the fee to review a permit application is forty-five dollars
($45.00).
24.4 For structures more
than two thousand square feet (2,000 sq\ ft.) and less than three thousand
square feet (3,000 sq. ft.), the fee to review a permit application is ninety
dollars ($90.00).
24.5 For
structures more than three thousand square feet (3,000 sq. ft.) and less than
four thousand square feet (4,000 sq. ft.), the fee to review a permit
application is one hundred twenty dollars ($120.00).
24.6 For structures four thousand (4,000 sq.
ft.) and greater, the fee to review a permit application is one hundred fifty
dollars ($150.00)
24.7 For the
alteration, repair, or extension of any individual drip dispersal system, the
fee to review a permit application is thirty dollars ($30.00).
24.8 In calculating the square footage of a
residential structure for purposes of determining the applicable fee under this
section the square footage of all auxiliary areas of the residential structure
shall not be considered.
24.9
Auxiliary areas include garages, carports, porches, and other similar areas as
determined by the Department.
24.10
Non-individual or multi structure permit submittals shall include a
Cost Estimate Worksheet (EHP-17).
SECTION 25.
Penalties
25.1 Any person, firm, corporation or
association who violates any of the provisions of Act 402 of 1977, as Amended,
or any Rules and Regulations promulgated under the authority of Act 402 of
1977, as Amended, shall upon conviction, be deemed guilty of a misdemeanor and
shall be punished by a fine of not less than one hundred dollars ($100.00) nor
more than one thousand dollars ($1,000.00)
SECTION 26.
Severability
26.1 If any provisions of these Rules and
Regulations, or the application thereof to any person is held invalid, such
invalidity shall not affect other provisions or applications of these Rules and
Regulations, which can effect without the invalid provisions of application,
and to this end the provisions hereto are declared to be severable.
Section 27.
Repeal
27.1 All
Regulations and parts of Regulations in conflict herewith are hereby
repealed.
SECTION 28.
Certification
This is to certify that the foregoing Rules and Regulations for
Mass Gatherings in Arkansas were adopted by the Arkansas State Board of Health
at a regular session of said Board held in Little Rock, Arkansas on the
22nd day of April, 2010.
TABLE I
DRIP DISPERSAL FIELD SIZE
AND
SOIL LOADING RATES
Brief SWT
|
Mod SWT
|
Long SWT
|
Dept to
RMF
|
(g/ftVd)
|
FT2/100 Gal./Day
|
(g/ftVd)
|
. . FT2/100 Gal./Day
|
(g/ft2/d)
|
ft2/ioo
Gal./Day
|
i
|
0.021
|
4878.05
|
0.007
|
14634.1
|
0,003
|
29268.3
|
2
|
0.041
|
2439.02
|
0.014
|
7317.07
|
0,007
|
14634.1
|
3
|
0.062
|
1626.02
|
0.021
|
4878,05
|
0,010
|
9756.1
|
4
|
0.082
|
1219.51
|
0.027
|
3658.54
|
0.014
|
7317.07
|
5
|
0.103
|
975.61
|
0.034
|
2926.83
|
0.017
|
5853.66
|
6
|
0.123
|
813.008
|
0.041
|
2439.02
|
0.021
|
4878.05
|
7
|
0.144
|
696.864
|
0.048
|
2090.S9
|
0.024
|
4181.18
|
8
|
0.164
|
609.756
|
0.055
|
1829.27
|
0.027
|
3658.54
|
9
|
0.185
|
542.005
|
0.062
|
1626.02
|
0.031
|
3252.03
|
10
|
0.205
|
487.805
|
0.068
|
1463.41
|
0.034
|
2926.83
|
, 11
|
0.226
|
443.459
|
0.075
|
1330.38
|
0.038
|
2660.75
|
12
|
0.246
|
406.504
|
0,082
|
1219.51
|
0.041
|
2439.02
|
13
|
0.267
|
375.235
|
0.089
|
1125.7
|
0.044
|
2251.41
|
14
|
0.287
|
348.432
|
0.096
|
1045.3
|
0.048
|
2090.59
|
15
|
0.308
|
325.203
|
0.103
|
975.61
|
0.051
|
1951.22
|
16
|
0.328
|
304.878
|
0.109
|
914.634
|
0.055
|
1829.27
|
17
|
0.349
|
286.944
|
0.116
|
860.832
|
0.058
|
1721.66
|
18
|
0.369
|
271.003
|
0.123
|
813.008
|
0.062
|
1626.02
|
19
|
0.390
|
256,739
|
0.130
|
770.218
|
0.065
|
1540.44
|
20
|
0.410
|
243.902
|
0.137
|
731.707
|
0.068
|
1463.41
|
21
|
0.431
|
232.288
|
0.144
|
696.864
|
0.072
|
1393.73
|
22
|
0.451
|
221.729
|
0.150
|
665.188
|
0.075
|
1330.38
|
23
|
0.472
|
212.089
|
0.157
|
636.267
|
0.079
|
1272.53
|
24
|
0.492
|
203.252
|
0.164
|
609.756
|
0.082
|
1219.51
|
25
|
0.513
|
195.122
|
0.171
|
585.366
|
0.085
|
1170.73
|
26
|
0.533
|
187.617
|
0.178
|
562.852
|
0.089
|
1125.7
|
27
|
0.554
|
180.668
|
0.185
|
542.005
|
0.092
|
1084.01
|
28
|
0.574
|
174.216
|
0.191
|
522.648
|
0.096
|
1045.3
|
29
|
0.595
|
168.209
|
0.198
|
504.626
|
0.099
|
1009.25
|
30
|
0.615
|
162.602
|
0.205
|
487.805
|
0.103
|
975.61
|
31
|
0.636
|
157.356
|
0.212
|
472,069
|
0.106
|
944.138
|
32
|
0.656
|
152.439
|
0.219
|
457.317
|
0.109
|
914,634
|
33
|
0.677
|
147.82
|
0.226
|
443.459
|
0.113
|
886.918
|
34
|
0.697
|
143.472
|
0.232
|
430.416
|
0.116
|
860.832
|
35
|
0.718
|
139,373
|
0.239
|
418.118
|
0.120
|
836.237
|
36
|
0.738
|
135.501
|
0.246
|
406.504
|
0.123
|
813.008
|
37
|
0.759
|
131.839
|
0.253
|
395.517
|
0.126
|
791.035
|
38
|
0.779
|
128.37
|
0.260
|
385.109
|
0.130
|
770.218
|
39
|
0,800
|
125.078
|
0.267
|
375.235
|
0.133
|
750,469
|
40
|
0.820
|
121.951
|
0.273
|
365.854
|
0.137
|
731.707
|
41
|
0.841
|
118.977
|
0.280
|
356.93
|
0.140
|
713.861
|
42
|
0.861
|
116.144
|
0.287
|
348.432
|
0.144
|
696.864
|
43
|
0.882
|
113.443
|
0.294
|
340.329
|
0.147
|
680.658
|
44
|
0.902
|
110.865
|
0.301
|
332.594
|
0.150
|
665.188
|
45
|
0.935
|
106.952
|
0.308
|
325.203
|
0,154
|
650.407
|
46
|
0.943
|
106.045
|
0.314
|
318.134
|
0.157
|
636.267
|
47
|
0.964
|
103.788
|
0.321
|
311.365
|
0.161
|
622.73
|
48
|
0.984
|
101.626
|
0.328
|
304.878
|
0.164
|
609.756
|
APPENDIX A
-QUANTITIES OF WASTEWATER FLOW FOR VARIOUS TYPES OF
ESTABLISHMENTS
ESTABLISHMENT TYPE
Airports, bus terminals, train stations
|
GALLONS PER DAY
|
Per passenger
|
5
|
Add per employee per 8 hour shift
|
20
|
Barber & beauty shops per chair
|
100
|
Bowling alleys
|
Toilet wastes per line
|
100
|
For food service, add restaurant usage below
|
Camps
|
Campground with central comfort stations per
camper
|
35
|
Day camps (no meals served) per camper
|
15
|
Per non- resident camper
|
50
|
Per resident camper or employee
|
75
|
Churches
|
Per seat/no food service
|
5
|
For food service, add restaurant usage below
|
For daycares, add school usage below
|
Commercial establishments excluding deli, bakery, or
meat department
|
Per 100 square feet of floor space
|
10
|
Add per 100 square feet of deli floor space
|
50
|
Add per 100 square feet of bakery floor space
|
50
|
Add per 100 square feet of meat market floor
space
|
100
|
Country clubs
|
Per resident member
|
100
|
Per non-resident member present
|
25
|
Dentists offices
|
Per wet service chair
|
200
|
Add per non wet service chair
|
50
|
Doctors office
|
Per practitioner
|
250
|
Add per employee per 8 hour shift
|
20
|
Factories, exclusive of industrial waster
|
Gallons per employee per 8 hour shift
|
No showers provided
|
20
|
Showers provided
|
35
|
Hospitals
|
Per bed space
|
200
|
For food service excluding patients, add restaurant
usage below
|
Hotels & Motels
|
Regular per room
|
150
|
Resort hotels & cottages
|
75
|
Add for establishments with self service laundry
facility per machine
|
750
|
Institutions per meal served per day
|
65
|
Mobile home parks
|
Per single wide mobile home space
|
300
|
Per double wide mobile home space
|
450
|
Nursing homes, rest homes, adult congregate living
facilities
|
Per bed
|
100
|
Add for food service (see Institutions, this
chart)
|
Office buildings per employee per 8 hour shift
|
15
|
Parks, public picnic
|
Toilets only per person
|
5
|
With bath house, showers, & toilets per
person
|
10
|
Recreation vehicle park
|
Recreational vehicle space for overnight stay,
|
Without water & sewer hookup per vehicle
space
|
75
|
Recreational vehicle space for overnight stay,
|
With water & without sewer hookup per vehicle
space
|
100
|
Recreational vehicle space for overnight stay
|
With water & sewer hookup per vehicle space
|
150
|
Restaurants
|
Per day per seat per meal setting
|
30
|
Using single service articles only per seat
|
25
|
Bar and cocktail lounge per seat
|
30
|
Carry out only
|
Per meal served without public restrooms
|
5
|
Per meal served with public restrooms
|
10
|
Add per employee per 8 hour shift
|
15
|
Residences
|
Single or multiple family per dwelling unit
|
I bedroom
|
150
|
2 bedroom
|
270
|
3 bedroom
|
370
|
4 bedroom
|
450
|
For each additional bedroom add
|
50
|
Rooming houses per occupant space
|
75
|
Schools per student
|
Day schools & day cares
|
15
|
Add for showers
|
10
|
Add for food service
|
5
|
Add for day school workers Boarding schools
|
20 75
|
Service stations & convenience stores
|
Per vehicle served
|
10
|
Food service, per meal served
|
5
|
Stadiums, race tracks, ball parks per seat
|
5
|
Swimming pools and bathhouses per patron
|
10
|
Theaters
|
Indoor, movies/auditorium per seat
|
5
|
Outdoor, drive-ins per space
|
10
|
Veterinary clinic
|
Per practitioner
|
250
|
Add per employee per 8 hour shift
|
20
|
Add per kennel, stall, or cage
|
20
|
FOOTNOTES:
The estimated flows for residential systems assume a maximum
occupancy of 2 persons per bedroom. Where residential care facilities
(non-institutional) will house more than 2 persons in any bedroom, estimated
flows are to be increased by 75 gallons per each additional occupant.
Waste from food service operations is commercial in nature and
may require special system sizing and treatment/disposal considerations. For
food service operations, kitchen wastewater flows are normally to be calculated
at 66% of the total wastewater flow. Estimated daily flow is based on 3 meals
served per seat per meal setting.
Systems serving high volume establishments, such as fast food
restaurants, convenience stores, and service stations require special sizing
consideration due to above average wastewater volume expected from restroom
facilities.