IL SEPTIC INSTALLERS EXAMINATION
Public Sewer Connection Private residence must connect if w/in 300' or for any commercial bldg. w/in 300'
that has flows less than 1500 gpd. Commercial w/ flows = to or greater than 1500
gpd must connect if sewer is w/in 1000'.
Unless physical barrier, ordinance, or cannot be done w/ individual line (4" line)-then
PSD system is OK.
Acceptable Pipe Materials Vitrified clay, ductile iron, or plastic.
Anything after the tank or from distribution box has to be vitrified clay or plastic.
Schedule 40 or Greater under roads, driveways, or parking areas
Gravity Slope Diameter: 4" pipe + min. slope of 12" per 100'
Building sewers in excess of 50' should have what? A C/O @ least every 50' from building to tank, distribution box, or ATU
Creviced Limestone Formation SS system cannot be installed where bottom of system is less than 4' from top of
limestone
If limestone is known to be present a soil test must be done @ least 4' deeper than
where the bottom of the trench will be
How far away can quick disconnect be? no more than 50' away from the device & w/in sight of
Experimental Use Permits min. of 10 experimental systems installed b4 unconditional approval granted. Permit
valid for 2 yrs & evaluated @ end of 2 yrs.
2 options for garbage grinders 1. solids retention tank btwn WW source & septic tk. for kitchen waste only. Needs
to be 50% of the size of the designed septic tank w/ a min. of 500 gals.
2. A septic tank receiving all flows sized as 50% of the septic tank size + septic tank
size. i.e., septic tk = 1500 gals. /2 = 750 + 1500 = 2250 (would need 2500 gal tk)
How long should a homeowner keep maint. records for the life of the system
their system?
When should the 1st maintenance of a septic tank after Prior to or within 3 yrs. After initial inspection it can be done once every 5 yrs. Can
installation be completed for a residence? be done by everyone + homeowner
If sludge layer /suspended solids are greater than 33% . . . Must pump tank and perform maintenance
When should a septic system be evaluated initially after prior to or w/in 3 yrs. After that it should be done @ least every 3 yrs.
installation for a non-residential bldg? Owner cannot do. has to be engineer, env. health practitioner, member of dept, HD,
or septic contractor
Aerobic Treatment Unit Evaluations 1 every 6 mos @ least (same ppl) + HOMEOWNER as long as they follow
manufacturer's requirements & proper maintenance
, IL SEPTIC INSTALLERS EXAMINATION
What is the maint. schedule for SFs & WSPs w/ surface @ least 1 per yr. + H.O. if rules r followed. Pumped when solids & scum greater
discharges? than 33%
Can a H.O. install & maintain a septic system on his/her Yes
property?
Who can perform the excavation for a septic system? A licensed installer (employee while supervised) or the property owner.
What is the min. size tank for flows UP TO 500 gpd? 750 gals.
If flows are greater than 500 gpd, how do you size the Tank size should be = to @ least 1.5x the estimated sewage flow
tank?
How do you size a tank(s) for flows greater than 1350 U must use multiple tks. in a series or multiple compartment tks. where the 1st tank
gpd? or the 1st comp. in a multicomp. tk. is 1/2-2/3 of the total required capacity. of the
tank(s)
How do you size the tank for a raised filter bed for a It has to be an NSF 40 batch treatment system. The aeration tank has to be 2x the
residence? daily flow
How do you size the tank for a RFB for a commercial bldg? The aeration tk. has to be 3x the daily flow.
Multiple tanks in a series connected @ btm for flow equalization can be used
How are RFB sidewalls sized? 3:1 ratio
How are distribution lines for RFBs? 4" perforated pipe on 15" centers
Describe a RFB mantle Mantle must go in 6" deep to original soil. Torpedo sand depth is 12" ttl. (0.5-2.0).
Sand filter media depth is 30".
What is the maximum size a RFB can be? A RFB cannot exceed 600 sq. ft. If more area is needed you must use multiple beds
sharing a common mantle separated by 15'
What filter loading rate do you use to size RFBs? For a residence with a flow of 1500 gpd or less, use a filter loading rate of 4 gals per
sq ft per day
For a commerical bldg. (or residence with flows greater Use a filter loading rate of 2.5 gals per sq ft per day for comm. bldgs. of any size or
than 1500 gpd), how do u size a RFB? residences w/ flows greater than 1500
A RFB mantle shall be at least.. = to the area of the FB. Shall not be designed for perc rates that exceed 120 mins
per inch.
Public Sewer Connection Private residence must connect if w/in 300' or for any commercial bldg. w/in 300'
that has flows less than 1500 gpd. Commercial w/ flows = to or greater than 1500
gpd must connect if sewer is w/in 1000'.
Unless physical barrier, ordinance, or cannot be done w/ individual line (4" line)-then
PSD system is OK.
Acceptable Pipe Materials Vitrified clay, ductile iron, or plastic.
Anything after the tank or from distribution box has to be vitrified clay or plastic.
Schedule 40 or Greater under roads, driveways, or parking areas
Gravity Slope Diameter: 4" pipe + min. slope of 12" per 100'
Building sewers in excess of 50' should have what? A C/O @ least every 50' from building to tank, distribution box, or ATU
Creviced Limestone Formation SS system cannot be installed where bottom of system is less than 4' from top of
limestone
If limestone is known to be present a soil test must be done @ least 4' deeper than
where the bottom of the trench will be
How far away can quick disconnect be? no more than 50' away from the device & w/in sight of
Experimental Use Permits min. of 10 experimental systems installed b4 unconditional approval granted. Permit
valid for 2 yrs & evaluated @ end of 2 yrs.
2 options for garbage grinders 1. solids retention tank btwn WW source & septic tk. for kitchen waste only. Needs
to be 50% of the size of the designed septic tank w/ a min. of 500 gals.
2. A septic tank receiving all flows sized as 50% of the septic tank size + septic tank
size. i.e., septic tk = 1500 gals. /2 = 750 + 1500 = 2250 (would need 2500 gal tk)
How long should a homeowner keep maint. records for the life of the system
their system?
When should the 1st maintenance of a septic tank after Prior to or within 3 yrs. After initial inspection it can be done once every 5 yrs. Can
installation be completed for a residence? be done by everyone + homeowner
If sludge layer /suspended solids are greater than 33% . . . Must pump tank and perform maintenance
When should a septic system be evaluated initially after prior to or w/in 3 yrs. After that it should be done @ least every 3 yrs.
installation for a non-residential bldg? Owner cannot do. has to be engineer, env. health practitioner, member of dept, HD,
or septic contractor
Aerobic Treatment Unit Evaluations 1 every 6 mos @ least (same ppl) + HOMEOWNER as long as they follow
manufacturer's requirements & proper maintenance
, IL SEPTIC INSTALLERS EXAMINATION
What is the maint. schedule for SFs & WSPs w/ surface @ least 1 per yr. + H.O. if rules r followed. Pumped when solids & scum greater
discharges? than 33%
Can a H.O. install & maintain a septic system on his/her Yes
property?
Who can perform the excavation for a septic system? A licensed installer (employee while supervised) or the property owner.
What is the min. size tank for flows UP TO 500 gpd? 750 gals.
If flows are greater than 500 gpd, how do you size the Tank size should be = to @ least 1.5x the estimated sewage flow
tank?
How do you size a tank(s) for flows greater than 1350 U must use multiple tks. in a series or multiple compartment tks. where the 1st tank
gpd? or the 1st comp. in a multicomp. tk. is 1/2-2/3 of the total required capacity. of the
tank(s)
How do you size the tank for a raised filter bed for a It has to be an NSF 40 batch treatment system. The aeration tank has to be 2x the
residence? daily flow
How do you size the tank for a RFB for a commercial bldg? The aeration tk. has to be 3x the daily flow.
Multiple tanks in a series connected @ btm for flow equalization can be used
How are RFB sidewalls sized? 3:1 ratio
How are distribution lines for RFBs? 4" perforated pipe on 15" centers
Describe a RFB mantle Mantle must go in 6" deep to original soil. Torpedo sand depth is 12" ttl. (0.5-2.0).
Sand filter media depth is 30".
What is the maximum size a RFB can be? A RFB cannot exceed 600 sq. ft. If more area is needed you must use multiple beds
sharing a common mantle separated by 15'
What filter loading rate do you use to size RFBs? For a residence with a flow of 1500 gpd or less, use a filter loading rate of 4 gals per
sq ft per day
For a commerical bldg. (or residence with flows greater Use a filter loading rate of 2.5 gals per sq ft per day for comm. bldgs. of any size or
than 1500 gpd), how do u size a RFB? residences w/ flows greater than 1500
A RFB mantle shall be at least.. = to the area of the FB. Shall not be designed for perc rates that exceed 120 mins
per inch.
