cover.pdf
INSPECTIONS OF EXISTING
SEPTIC SYSTEMS
Frequently the transfer of ownership of single family homes entails
a home inspection. If the home is served by an on-site subsurface
sewage disposal system (septic system) it usually is inspected as
part of the total home inspection process.
The State of Connecticut does not certify septic system inspectors
nor are there mandatory inspection procedures that all inspectors
should follow. In an attempt to clarify this situation, the
Connecticut Environmental Health Association (CEHA) organized a
committee of state and local health personnel; septic system
installers and cleaners, who perform inspections; home inspectors;
and members of the Connecticut Association of Realtors, to develop
the following "Connecticut Recommended Minimum Existing Septic
System Inspection Report" Form.
The committee is hopeful that this form will be utilized throughout
the industry as a standard for septic system inspections.
Prospective buyers should ask their real estate agent and/or their
septic system inspector whether or not this form will be used. If
the form will not be utilized, you may want to inquire as to the
thoroughness of the inspection.
The form is basically self-explanatory, however, the committee also
concluded that general information regarding various aspects of the
inspection process and a glossary of terms associated with septic
systems would be helpful to the general public. For that reason a
supplement to the inspection form was prepared and should be
supplied along with the completed form.
end cover.pdf
form.pdf
CONNECTICUT RECOMMENDED MINIMUM
EXISTING SEPTIC SYSTEM
INSPECTION REPORT
DATE: ______________
(1) PROPERTY ADDRESS: ____________________ TOWN: ________
Type of Dwelling or Use: ____________________________________
(2) CLIENT INFORMATION:
Client's Name: __________________________ Phone #: _________
Mailing Address: __________________________________________
  Town: _______________________ State: _______ ZIP:
________
(3) INSPECTOR INFORMATION:
Inspector's Name: _________________________________________
Company: _____________________________ Phone #: _________
Mailing Address: __________________________________________
  Town: _______________________ State: _______ ZIP:
________
DISCLAIMER:
THIS INSPECTION REPORT INDICATES THE PRESENT CONDITION OF THE
PRIVATE ON-SITE SUBSURFACE SEWAGE DISPOSAL SYSTEM BASED ON
RECOMMENDED INSPECTION PROCEDURES OUTLINED IN THIS REPORT. THE
RESULTS OF THIS INSPECTION DOES NOT GUARANTEE OR WARRANTY
FUTURE PERFORMANCE. THE INSPECTION REPORT EXCLUDES AND DOES
NOT INTEND TO COVER COMPONENTS THAT ARE INACCESSIBLE (BY
REASONABLE HAND DIGGING) OR ARE OTHERWISE NOT OBSERVABLE.
(4) RESULTS AND RECOMMENDATIONS (Check applicable items):
a. ______ System functioned properly at time of inspection
b. ______ System functioning but is not sized per current
standards, no upgrade required
c. ______ System operating at capacity under current usage
levels
d. ______ Plumbing leaks or wastewater routing problems in
home
e. ______ Need for component replacement due to structural
damage
f. ______ Further investigation of leaching system with machine
digging is recommended
g. ______ Evidence of prior high liquid levels in system
components
h. ______ Sewage overflow observed, repair required under permit
of local health department
i. ______ Soil testing recommended to determine expansion/repair
area
COMMENTS AND RECOMMENDATIONS FOR ABOVE CHECKED ITEMS ON NEXT PAGE
INSPECTION REPORT
PAGE 2
COMMENTS
_______________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
RECOMMENDATIONS
_______________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
NOTE: The recipient of this report should discuss
any deficiencies found
by this inspection with the Inspector.
INSPECTION PROCEDURES
(5) RECORDS AND DATA: (OBTAIN AS MUCH AS
PRACTICAL PRIOR TO THE ACTUAL INSPECTION)
This information may be
obtained through numerous sources, some of which is provided
voluntarily, such as, through the property owner. The inspector
assumes no responsibility for the accuracy of information provided
in this manner.
Attach copies of all available records and indicate
the source of such records.
RECORDS (INDICATE NUMBER OF EACH)
Permit Applications:
New System: _________ Date: ____________ Source: ____________
Repair/Alter: _________ Date: ____________ Source: ____________
Permits to Construct:
New System: _________ Date: ____________ Source: ____________
Repair/Alter: _________ Date: ____________ Source: ____________
Permits to Discharge:
New System: _________ Date: ____________ Source: ____________
Repair/Alter: _________ Date: ____________ Source: ____________
NOTE: Lack of records or data on file does not necessarily indicate
that the existing subsurface sewage disposal system is non-compliant
with installation standards.
MAINTENANCE RECORDS
Last Two Septage Pumpout Dates: ______, _______ Source _______
Copies of Pumpout Reports: Available? ______ (Y/N) Source
_______
LOCATION DRAWING - (AS-BUILT)
Is a Location Drawing Available? ______ (Y/N) Source
________________
INSPECTION REPORT
PAGE 3
(6) GENERAL INFORMATION
Age of System: Tank: _________ Years
Leaching Fields: _______
Years
Number of People Occupying Dwelling: Currently ______
Anticipated
______
If currently unoccupied, how long has it been vacant? _________
Number of bedrooms: ________
Water Supply to Building: ______ Well; _____ Comm. Well;
_____ Public water supply
(7) WASTEWATER ROUTING
One Tank/One System _______ Two or more tanks/One
System _____
Separate Gray and Black Water Systems _______
Does more than one sewer line leave the foundation _____ (Y/N)
(indicating possible two separate systems?)
Is there an in-home ejector pump? ______ (Y/N)
Water treatment system present? ______ (Y/N)
If Yes, does backwash discharge to septic system? _____(Y/N) If
Yes, recommend alternative.
Is there a garbage disposal present? _____ (Y/N) If Yes, recommend
cleaning tank more
often.
Is there a sump pump present? _____ (Y/N) If Yes, where
discharged?________
Does the washing machine discharge to septic tank? ______ (Y/N) If
No, DYE TEST may be
necessary.
If discharge is to a separate drywell or separate leaching system,
is
it functional? _____ (Y/N)
If No, corrective action would be required.
Is there any indication that sewage bypasses the septic
system? ______ (Y/N) If Yes, DYE TEST may be necessary.
NOTE: IF DYE TEST IS NECESSARY PERFORM IT PRIOR TO PUMPING TANK
(8) SEPTIC TANK EVALUATION
TYPE OF SEPTIC TANK: ______ Cesspool
______Single Compartment
_____ Two Compartment _______
Multiple Tanks
CLEANOUT OF TANK ACCESSIBLE? _____ (Y/N) At what depth
below grade? _________*
*If greater than 12" a riser to within 12" is
required by Public Health Code.
TANK CONSTRUCTION: ______ Concrete _____ Plastic
_____ Fiberglass
______ Metal ___ Other:
_____________________________________
VOLUME OF TANK: ________ Gallons
TANK COMPONENTS: PRESENT TYPE CONDITION
(Y/N) COMP.
(GOOD,FAIR,POOR)
General Tank ________ __________________
Inlet Sewer Line ________ __________________
Inlet Baffle _____ ________ __________________
Outlet Baffle _____ ________ __________________
Effluent Filter _____ ________ __________________
Compartment Wall _____ ________ __________________
Has there been any indication of previous higher than normal
levels of septage in the tank?
______(Y/N)
What is actual distance between liquid level in tank and tank
ceiling? _______ inches
INSPECTION REPORT
PAGE 4
If septic tank was pumped,
did sewage flow back into the tank from the leaching fields? _______
(Y/N)
(this may indicate either, the system is flooded or, there is
blockage occurring in the distribution system)
What was the amount
of solid build-up in the tank at the time of inspection:
_______ Excessive _______ Normal _______ Light
Is system served by a pump and pump chamber? _______ (Y/N)
If yes, give details:
____________________________________________
____________________________________________________________
Pump in working order, with alarm, manhole to grade?
________________
____________________________________________________________
(9) LEACHING SYSTEM EVALUATION
TYPE OF SYSTEM: _____ Trenches _____Galleries _____ Pits
_____ Bed ______ Other, Type? ___________________________
LEACHING AREA REQUIRED PER CURRENT STANDARDS (if perc. test
info. is avail.):
________ S.F.
EFFECTIVE LEACHING AREA PROVIDED (if as-built drawing is
available) _________ S.F.
Distance between septic tank/leaching fields and
potable water wells: ______ FEET*
* INDICATE LOCATIONS AND DISTANCES ON DIAGRAM ON PAGE 5
Are there any structures or impermeable surfaces
located over or near the leaching area? ______ (Y/N)
Describe:
_________________________________________________________
_________________________________________________________________
Were one or more of the following signs of system malfunction
present?
____ SEPTIC ODORS
____ PONDING OR SEWAGE BREAKOUTS
____ LUSH GREEN GRASS OVER PARTS OF SYSTEM
____ ILLEGAL DISCHARGE
Does surface water, roof drains, or sump pump runoff drain onto
the leaching area
_______ (Y/N)
Were distribution boxes exposed? ____ (Y/N) What was found?
____________
_________________________________________________________________
Was the leaching system probed? _____ (Y/N) What were results?
___________
___________________________________________________________________
___________________________________________________________________
Were there any leaching galleries or pits opened to observe
present or past effluent levels? _____(Y/N)
What was found?_________________________________________________
________________________________________________________________
________________________________________________________________
INSPECTION REPORT
PAGE 5
Was a more in-depth investigation of leaching system conducted? _____ (Y/N)
What were results? ________________________________________________
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
Is there an expansion/repair area available?
________ Likely ________ Not Likely ________ Unknown
Were there any conditions observed which could limit a repair?
(wetlands, ledge outcrops, streams, etc.)
______________________________________________
___________________________________________________________________
___________________________________________________________________
(10) DIAGRAM OF S. TANK AND LEACHING SYSTEM LOCATION (ties from
permanent structures):
________________________________________________________________
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____________________________________
INSPECTOR'S NAME (printed or typed)
____________________________________
INSPECTOR'S SIGNATURE
PROFESSION:_________________ LIC.NO._________
DATE:______________
This form has been
developed by the Connecticut Environmental Health Association with
assistance from the State Department of Public Health, Local
Sanitarians, Licensed Installers, CT Sewage Disposal Association, CT
Association of Realtors and the Home Inspection Industry
SSDSINSPECTIONFORM5.DOC
end form.pdf
supplement.pdf
SUPPLEMENT
EXISTING SEPTIC SYSTEM
INSPECTION REPORT
May 1, 2001
I. PURPOSE
Frequently prospective
buyers of a single family home have many questions regarding the
septic system serving the dwelling: What does the existing septic
system consist of? Is it working properly? How long will it last? If
it fails, how much will a replacement system cost?
The attached
"Connecticut Recommended Minimum Existing Septic System Inspection
Form," if utilized by a qualified inspector (see below), could
answer many of the above questions. In order for a buyer who is not
familiar with the operation and proper maintenance of a septic
system to understand the terminology made in the inspection report,
the following fact sheet has been prepared.
Those interested in a
more in-depth presentation on the subject can obtain the book,
"The Septic System Owner's Manual" by Lloyd Kahn, Blair Allen and
Julie
Jones, published by Shelter Publications, copyright 2000.
II. WHO IS QUALIFIED TO PERFORM INSPECTION?
An inspector must have a thorough
understanding of how a septic system is installed and functions.
Although there is not a State certification program in Connecticut
regarding septic system inspectors, the following are
recommendations as to who may be qualified:
- Licensed Subsurface
Sewage Disposal System Installers
- Professional Engineers
(Sanitary/Civil Engineer Discipline)
- Registered Sanitarians or
Sanitarians who have been certified by State Dept. of Public Health
to inspect subsurface sewage disposal systems.
- Inspectors who have
obtained an accreditation through training and certification from
one of many sources (National Association of Waste Transporters
(NAWT); National Small Flows Clearinghouse; National Sanitation
Foundation (NSF); any of a number of state sponsored inspection
certification programs).
A key element for any of the above
individuals is experience. How long have they been associated with
septic system matters? Have they installed, designed or inspected
many systems?
III. OVERVIEW OF SUBSURFACE SEWAGE DISPOSAL SYSTEM
The purpose of a home's subsurface sewage disposal system (septic
system) is to dispose of the wastewater generated by the occupants
in such a manner that the soils on the property can disperse it
without causing an adverse effect on groundwater and in turn on
public health and the environment. To accomplish this, domestic
sewage is directed to a system consisting of the following elements:
(1) A building sewer, which connects the home's plumbing to
the
septic tank.
(2) A septic tank, which allows for the settling of
solids and provides the initial treatment of the sewage. This is
where waste material is broken down by bacterial action. A properly
functioning septic tank will reduce pollutant levels and produce an
effluent of fairly uniform quality.
(3) A distribution system, which
directs the flow of effluent from the septic tank to the drainage
system in a manner that assures full utilization of the system. Most
systems are "gravity" systems, meaning the effluent flows through
piping and distribution boxes without the assistance of any
mechanical device, such as a pump or siphon.
(4) A drainage
(leaching) system, which disperses the sewage effluent into the
surrounding natural soils. There are many types of drainage systems.
The specific type utilized on a particular property is usually
dependent on the soil conditions that exist on the site. Most
residential installations utilize stone-filled leaching trenches,
but galleries, pits and beds have historically been used.
For a leaching system to function properly it must:
1. Provide enough
application area. The application area is the amount of surface area
provided by the particular drainage system (sides and bottom area of
leaching units) where sewage effluent is applied to soil. The amount
of application area needed for a given house depends on the
characteristics of the soils on the property and the daily flows (in
gallons) generated from the house. The anticipated flow from a house
is usually predicated on the number of bedrooms in the dwelling.
2. Be surrounded by natural soil
conditions that will be able to
dissipate and disperse the septic tank effluent discharge without
becoming over saturated.
3. Provide enough capacity to store
effluent during periods of unusually heavy use or when rainfall or
subsurface flooding reduces the ability of the system to disperse
the liquid.
Note: Curtain drains/groundwater interceptor drains are
sometimes installed upgrade of the drainage system to minimize high
groundwater conditions.
It is important to realize that, once a
system has been installed, the homeowner can control only one of the
above factors. The homeowner can control how much water is actually
being discharged to the system. Since each system has a set
maximum capacity, it behooves the homeowner not to exceed
that amount.
It should be a goal of the inspection to determine the estimated
water
usage the existing septic system can handle before it would likely
become overloaded and fail.
NOTE: Many homes in Connecticut are
served by private wells. These homes rarely have water meters
installed on the water service line coming into the home. Because of
that fact those property owners are at a disadvantage when judging
their water usage levels since they have no way to monitor usage. It
is recommended that a water meter be installed whenever
there is a
concern that water usage levels from the home may exceed the
capacity of the existing septic system.
If a system starts to
experience difficulties, what are some of the common symptoms?
1. Plumbing fixtures may exhibit
difficulty in releasing their contents
(slow draining, bubbling, backups, etc.). This condition may be
system related but it could also indicate just a clog in the
interior piping or sewer line. The homeowner should have the
interior piping checked before proceeding with an investigation of
the sewage disposal system. However, on newer systems or retrofits,
the above symptoms could indicate that the septic tank outlet filter
is becoming clogged. In that case, tank maintenance is required in
order to clean the filter and, more than likely, pump the tank.
2. Large volume discharges (such as,
washing machines, dishwashers and
bathtubs) cause either a backup, as noted above, or an overflow of
sewage above the septic tank or leaching field. This condition is
usually at its worst during and/or directly following a heavy rain
event.
3. Foul septic odors in storm
drainage piping, catch
basins, footing drain piping or curtain drain discharges may
indicate that sewage from your or an adjacent property is entering
these groundwater systems.
4. System is operating at
capacity: As
stated above, all leaching systems are sized to release a certain
quantity of sewage each day. If the system is maintained and
operated properly (the septic tank is cleaned periodically and the
water usage is within limits), theoretically, the system should last
indefinitely. However, if the leaching system's interface area
becomes clogged or more sewage is discharge into the system then it
was designed for, the system could be operating at
capacity. This
means that when a system is opened sewage would be observed up to
and above certain system elements (outlet pipes of distribution
boxes and or the septic tank). The conclusion which should be
reached from such an observation is that whatever the recent daily
flow from the building has been, any increase would likely cause a
system failure and a need for corrective action.
Gray water/Black water Systems, what's the difference?
A normal septic system
technically is a black water system. All wastes enter a septic tank
followed by a leaching system. When toilet wastes are separated from
kitchen or laundry wastes the non-toilet waste discharge is defined
as gray water. Separation was a standard practice of septic system
installations prior to 1970. However, studies have found that gray
water systems are detrimental to the environment, especially when
the discharge is directed to a leaching system, bypassing a septic
tank. It is for that reason that whenever an existing gray water
system fails, connection must be made to the building's black water
system or, a septic tank must be installed prior to a new leaching
structure.
IV. OLD VERSUS NEW SEPTIC SYSTEMS AND THE INSPECTION PROCESS
As stated in the first section, prospective buyers of a
single family home want to know what the existing septic system
consists of and whether the existing system will satisfy their
needs. To answer those issues the inspector must use some point
of
reference in order to evaluate what was found and determine the
likelihood it will perform adequately. The point of reference
utilized for comparison is the present Public Health Code. This may
put older homes with aging septic systems at a disadvantage but it
is the only way that conclusions reached during the inspection
process can be consistent from one inspector to the next or from one
house to the next. The client should understand, however, that an
older system, which may not meet today's standards, could be
perfectly adequate for their needs and may serve them well for many
years. It is hoped that the inspection process will be able to
give
meaningful and accurate information to the client so that they can
make an informed decision relative to the existing septic system. It
should also be noted that whenever an older system is found to
deviate from present health code requirements, the system does
not
have to be upgraded or repaired unless it is in a state of failure
(overflow condition or illegal discharge, etc.) causing a health
hazard.
V. GLOSSARY OF TERMS REGARDING ...
SYSTEM SIZING
Water Usage:
Is the amount of wastewater that will be discharged into the system
each day. For residential dwellings it is assumed that each occupant
will discharge an average of 50 gallons per day (GPD). Under normal
circumstances not more than two people would occupy any bedroom,
therefore, a maximum of 100 GPD average usage has been set for each
bedroom for sizing the system per code. For other uses, such as,
office/retail, restaurant, industrial, etc., the water usage would
be determined on a case by case basis. As stated in Section III, if
a home is served by a well and there is a concern over water usage,
a water meter should be installed.
Flow Test (or "push test"):
Although not usually recommended, this test can be used as a
screening procedure in order to expose those systems that are near
capacity (on the verge of failure) and vulnerable to moderate water
usage. The test consists of discharging a quantity of water into the
existing septic system to simulate a typical "peak" usage of water
by a family. After a certain amount of water is "flushed" down
sinks, tubs and toilets, the inspector examines the leaching area to
observe any signs of an "overflow" condition. If an "overflow" is
observed, the conclusion reached by the inspector is that the system
is not functioning properly. It should be noted, however, that
"passing" the test does not necessarily mean that the system is
working properly. There is a concern with performing this test.
Unless this test is performed in a responsible, site specific
manner, it could cause harm to the existing system or lead to
erroneous conclusions. For more information on this test please
refer to the State Department of Public Health's "Buying Guide" for
homes served by a septic system.
Number of Bedrooms: The number
of
potential bedrooms in a home determines the maximum occupancy for
that home. This in turn will determine the size of the leaching
system based on this maximum occupancy assumption. It is not
possible for anyone to foresee future utilization of a home over and
above the present occupants. It is for that reason that reductions
in leaching system size are not allowed even though the present
owners may not be using all the potential bedrooms as bedrooms (they
may be using rooms as studies, or sewing rooms, or computer rooms,
etc.) or occupying each room with two people.
Leaching System Size:
The size of a leaching system is determined by relating the
percolation rate of the soil and the anticipated daily discharge, to
the amount of sewage application area provided by the system. The
application area is sometimes referred to as the "wetted perimeter".
It is the actual surface area that sewage comes in contact with just
prior to entering the surrounding soil. Each type of leaching system
(see Leaching System Section) provides different amounts of "wetted
perimeter" per linear foot of system length. In a normal system, the
"wetted perimeter" forms a biological slime layer that slows down
and actually renovates the sewage prior to it entering the
surrounding soils. The thickness of this layer, and the speed with
which sewage passes through it, will be dependent on how much
suspended solids and greases are released by the septic tank. That
is why it is so important to clean the septic tank out periodically
to maintain a uniform quality effluent leaving the tank.
SUITABLE SOIL CONDITIONS
Deep Test Holes: Deep test
holes are dug within and
down grade of a proposed leaching area to determine the soil
characteristics, maximum groundwater levels and ledge rock
conditions. Depending on what is observed, the type of system and
the configuration of that system will be determined. Deep test holes
must be conducted and observed by a professional engineer and/or a
local health department sanitarian.
Percolation Tests: In order for
a septic system to function properly the soils in which it is placed
must be permeable. The quicker water can pass through the soil the
smaller the leaching system can be. The percolation test is an
empirical means utilized to estimate a soil's general permeability.
Unit of measure is in "minutes per inch," representing how long it
takes a column of water to drop an inch in a small diameter hole dug
in the soil strata that will be utilized for sewage disposal.
Suitable Soils: Soils which
are permeable (percolation rates faster
than 60 minutes per inch) must meet other criteria prior to being
deemed suitable. There must be at least 24" of permeable naturally
occurring soils over ledge rock. In shallow bedrock areas
substantial amounts of "select" (good quality) fill material would
be necessary to raise the leaching system at least four (4) feet
above the ledge. Also, the soil in the leaching area must not flood
from seasonal high ground- water. The code requires at least 18" of
unsaturated soils be present during the wettest time of the year.
Naturally Occurring Soils: The
code refers to a septic system being
able to adequately absorb or disperse the expected amount of sewage
into the surrounding naturally occurring soils without overflow,
breakout or detrimental effect. Discharging a large amount of sewage
in a confined area, especially if ground conditions can not support
a great deal of extra water, could overload that area and lead to a
septic overflow. Fill material (brought onto the site by
artificial
means) can never be classified as "naturally occurring soil."
Likewise, bringing in fill material to cover a sewage overflow
condition is not an acceptable repair, since it does not
correct the
inherent problem of the leaching system which is its inability to
release the sewage into the ground.
Minimum Leaching System Spread
(MLSS):
In order to prevent the overflow or breakout of sewage from
occurring within or downgrade of a leaching system, the Public
Health Code stipulates that the system must be spread out a minimum
length across the slope. The calculation of this length is
determined by use of tables referred to as "Minimum Leaching System
Spread" Factor Tables or by a formal hydraulic analysis. The greater
the depth of unsaturated naturally occurring soil, the greater the
slope of the ground and the faster the percolation rate are
conditions which will result in reduced system spreads. In the case
of repairing an existing system when there is limited available
area, the amount of sewage discharge from the building (home) may be
restricted. Proposed additions or remodeling (which would increase
the number of bedrooms) may not be allowed under these restrictions.
SEPTIC TANK
Purpose of Septic Tank: The
septic tank's function is to
slow down discharges from the building's plumbing fixtures so that
solid material can fall to the bottom of the tank and greases and
scum can rise to the top. A stable biological system within the tank
promotes the conversion of organic solids to soluble organic
chemicals and gases. The result is a relatively uniform quality
septage that will proceed to the leaching fields. There is no
need
to introduce any commercial additives to the tank to promote
biological growth.
Cesspool: Cesspools were
utilized frequently more
than 50 years ago to dispose of all wastes from the home. A large
diameter pit would be dug approximately 6 or 7 feet below grade then
be lined with large stones or concrete blocks. The cesspool would
then be connected directly to the home's plumbing. A cesspool is not
technically a septic tank since it does not separate out solid
material, allowing such material to come in contact with the soils
surrounding the pit. Since this condition could lead to
contamination of groundwater in the area, the current Connecticut
Public Health Code requires the installation of a septic tank
whenever an existing cesspool malfunctions and requires repair.
Pump-Out Frequency: It is
recommended that septic tanks be cleaned
every 2 to 5 years. The frequency should be based on the occupancy
of the home and how quick solid material builds up in the tank. It
should be noted that the use of a garbage disposal
significantly
increases the amount of solid material and greases entering a tank
and therefore, should result in more frequent pumping. Septic tanks
that have less than 1,000 gallons of capacity or are undersized for
the existing usage have to be pumped more frequently.
Septic Tank Depths and the Need
for Risers:
Whenever the top of a septic tank is
located deep into the ground it becomes more difficult to gain
access to that tank for maintenance (cleaning and the "snaking" of
clogged sewer line). For that reason the Technical Standards to the
Connecticut Public Health Code, effective January 1, 2000 requires
that all new and existing septic tanks have at least one
cleanout
manhole located not more than 12" from final or existing grade. When
the top of a septic tank is more than 12" from grade a
riser collar
shall be installed over the cleanout manhole so that access to the
tank will be less than 12" from grade level.
Volume of Tank: The Public
Health Code requires a
minimum 1,000 gallon septic tank for
all new buildings. For residential buildings an additional 250
gallons of capacity shall be added for each bedroom over three (3).
Therefore, a four (4) bedroom home would require a 1,250 gallon
tank, a five (5) bedroom home a 1,500 gallon tank, etc. If an
older
house has a septic tank which falls below the present sizing
requirements, it does not have to be replaced (unless physically
damaged in some way), but may have to be cleaned more often.
Inlet and Outlet
Baffles/Compartment Wall: In order to reduce the flow of
septage through the tank, baffles are placed on the inlet and outlet
piping to and from the tank. In most cases, the baffles consist of
"tee" connections of 4" PVC piping. The piping is submerged into
septic liquid a minimum of 8" at the inlet and 10" at the outlet. On
all new tanks a compartment wall is installed in order to separate
the liquid in the tank into 2/3, 1/3 volumes. The septage in the
tank passes from the first compartment to the second through a mid-
depth
opening.
Outlet Effluent Filter: As of
July 1, 2000, all newly
installed septic tanks shall have an effluent filter placed at the
outlet in place of the outlet baffle. The purpose of the filter is
to trap suspended solids that are not heavy enough or have not had
enough time to sink to the bottom of the tank. This occurs
frequently when a tank hasn't been pumped in a timely manner and
contains a significant amount of material that reduces its effective
volume. Filters must be periodically cleaned so that they do not
plug and back septage back into the house. The cleaning interval
should correspond to the recommended pump-out frequency. If the
filter plugs at a higher frequency the options would be to change
the type of filter presently being utilized (increasing the flow
through surface area) or, add extra filters in series to increase
the time interval between cleanings.
LEACHING SYSTEMS
Trenches: Are
linear excavations that are a maximum 48" in width and 18" in
height. Trenches are backfilled with one-inch stone surrounding a 4"
perforated distribution pipe located 6" or 12" above the bottom of
the trench. The distribution pipe is covered with a minimum 2" of
stone.
Galleries: Are hollow structures
that are a minimum 48" in
width and of various heights (12" up to 48"). Originally these
structures were made of concrete, but today plastic structures are
available either in single or multiple unit configurations. All
galleries are installed with one-inch stone on each side, within the
required minimum six (6) foot wide excavation.
Pits: Are hollow
structures that are usually placed in deep round excavations. The
structures are between five (5) feet and ten (10) feet in diameter.
Pits are installed with 12" to 24" of one-inch stone surrounding the
units. Pits are usually installed only when groundwater levels are
very low and the soil in the area has a relatively fast percolation
rate.
Proprietary Leaching Systems:
Are
various types of leaching
products that combine different materials, such as, plastic, filter
fabric, and cardboard, into configurations that either eliminate the
need for stone, reduce the amount of "select fill" needed, or
provide more Effective Leaching Credit per foot than more
traditional products listed above.
ACCESSORY ELEMENTS
Curtain Drains: In some cases
groundwater levels on a site may interfere
with the proper operation of a septic system. If conditions permit,
as determined by soil testing, a curtain drain may be installed
uphill from the septic area in order to lower 9 groundwater levels.
Curtains drains are not always effective in lowering groundwater
levels, therefore, before a leaching system can be installed,
springtime monitoring of the area is needed in order to determine
the lower water table levels.
Backwash from Water Treatment
System:
The State of Connecticut Public Health Code - Technical Standards
prohibits backwash from a water treatment system from being
discharged into a septic system (usually by connecting the discharge
hose to the sewer line leading to the septic tank). The Department
of Environmental Protection (DEP) is presently developing protocols
for the proper disposal of such waste.
PERMIT TO DISCHARGE
Permit to Discharge: After
completing the installation of any subsurface
sewage disposal system (new or repair) a Permit to Discharge shall
be issued by the local health department. The issuance of the Permit
to Discharge shall imply that an "as-built drawing" has been
provided indicating the location of all key elements of the system,
the system has been installed in accordance with code requirements
(unless specific exceptions to the code are granted in the case of
repaired systems) and list any limits that have been placed on the
use of the system (such as, limiting the amount of daily discharge).
VI. CONCLUSIONS
It is hoped that the above supplement helps explain
what a septic system is and how to evaluate the information supplied
on the "Existing Septic System Inspection Form" accompanying this
supplement. If you have any additional questions associated with the
form please feel free to contact the inspector, your local health
department or the State Department of Public Health
at (860) 509-7296.
end supplement.pdf
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