IL SEPTIC INSTALLERS MIDTERM EXAM QUESTIONS SOLVED CORRECTLY.
6 views 0 purchase
Course
OSSF Installer 1
Institution
OSSF Installer 1
Public Sewer Connection - Answer 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/ ...
IL SEPTIC INSTALLERS MIDTERM EXAM
QUESTIONS SOLVED CORRECTLY.
Public Sewer Connection - Answer 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.
Anything after the tank or from distribution box has to be vitrified clay or plastic.
Schedule 40 or Greater - Answer under roads, driveways, or parking areas
Gravity Slope - Answer Diameter: 4" pipe + min. slope of 12" per 100'
Building sewers in excess of 50' should have what? - Answer A C/O @ least every 50' from building to
tank, distribution box, or ATU
Creviced Limestone Formation - Answer 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? - Answer no more than 50' away from the device & w/in sight
of
Experimental Use Permits - Answer 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 - Answer 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 their system? - Answer the life of the system
When should the 1st maintenance of a septic tank after installation be completed for a residence? -
Answer Prior to or within 3 yrs. After initial inspection it can be done once every 5 yrs. Can be done by
everyone + homeowner
If sludge layer /suspended solids are greater than 33% . . . - Answer Must pump tank and perform
maintenance
When should a septic system be evaluated initially after installation for a non-residential bldg? - Answer
prior to or w/in 3 yrs. After that it should be done @ least every 3 yrs.
Owner cannot do. has to be engineer, env. health practitioner, member of dept, HD, or septic contractor
Aerobic Treatment Unit Evaluations - Answer 1 every 6 mos @ least (same ppl) + HOMEOWNER as long
as they follow manufacturer's requirements & proper maintenance
What is the maint. schedule for SFs & WSPs w/ surface discharges? - Answer @ least 1 per yr. + H.O. if
rules r followed. Pumped when solids & scum greater than 33%
Can a H.O. install & maintain a septic system on his/her property? - Answer Yes
Who can perform the excavation for a septic system? - Answer A licensed installer (employee while
supervised) or the property owner.
What is the min. size tank for flows UP TO 500 gpd? - Answer 750 gals.
, If flows are greater than 500 gpd, how do you size the tank? - Answer Tank size should be = to @ least
1.5x the estimated sewage flow
How do you size a tank(s) for flows greater than 1350 gpd? - Answer U must use multiple tks. in a series
or multiple compartment tks. where the 1st tank 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 residence? - Answer It has to be an NSF 40 batch
treatment system. The aeration tank has to be 2x the daily flow
How do you size the tank for a RFB for a commercial bldg? - Answer 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? - Answer 3:1 ratio
How are distribution lines for RFBs? - Answer 4" perforated pipe on 15" centers
Describe a RFB mantle - Answer 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? - Answer 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? - Answer 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 than 1500 gpd), how do u size a RFB? - Answer
Use a filter loading rate of 2.5 gals per sq ft per day for comm. bldgs. of any size or residences w/ flows
greater than 1500
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller COCOSOLUTIONS. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.09. You're not tied to anything after your purchase.
