Download OSSF Installer 1 Exam: Questions and Answers and more Exams Agricultural engineering in PDF only on Docsity!
OSSF INSTALLER 1 EXAM | ALL QUESTIONS
AND CORRECT ANSWERS (VERIFIED
ANSWERS) | GRADED A+ | LATEST EXAM |
JUST RELEASED
What is a solid that can be filtered from waste called ---------CORRECT ANSWER-----------------TOS total suspended solids What is a solid that cannot be filtered from wastewater called --------- CORRECT ANSWER-----------------TDS total dissolved solids What is Biochemical Oxygen Demand (BOD) ---------CORRECT ANSWER- ----------------measure strength of wastewater in regard to organic loading What is dissolved oxygen (DO) ---------CORRECT ANSWER----------------- free oxygen that can become available to waste, is consumed in a short period of time, measure of freshness Temp up, DO down Temp down, DO up What pH is typical for wastewater ---------CORRECT ANSWER----------------- 6.5-8. How does nitrogen removal take place? ---------CORRECT ANSWER-------- ---------by vegetative uptake and denitrification in slow rate systems
Anaerobic bacteria is NOT found in ---------CORRECT ANSWER-------------- ---activated sludge What is physical straining in relation to soil treatment ---------CORRECT ANSWER-----------------bacteria are larger than soil pore opening, increased efficiency What is flow rate in relation to soil treatment ---------CORRECT ANSWER--- --------------low flow has better efficiency of virus removal What factors influence bacteria survival in soil ---------CORRECT ANSWER-----------------moisture, temperature, pH and organic matter What OSSF should be used in clay soil ---------CORRECT ANSWER--------- --------drip or spray irrigation Adsorption will occur ---------CORRECT ANSWER-----------------in water with high hardiness and pH 6.5- 7 Can a septic tank be considered a pretreatment system ---------CORRECT ANSWER-----------------yes A standard disposal system does NOT include ---------CORRECT ANSWER-----------------gravel less pipes
Permeability ---------CORRECT ANSWER-----------------the capacity of a material to transmit water Uniform grains have high porosity ---------CORRECT ANSWER----------------
- true Non uniform grains have low porosity ---------CORRECT ANSWER------------ -----true Fractured rock has what type of porosity ---------CORRECT ANSWER-------- ---------high Clay porosity and specific yield ---------CORRECT ANSWER----------------- 45 - 55% and 1- 10 Gravel porosity and specific yield ---------CORRECT ANSWER----------------- 25 - 40% and 15- 30 Sand porosity and specific yield ---------CORRECT ANSWER----------------- 25 - 40% and 10- 30 What are the 3 chemical properties of soil ---------CORRECT ANSWER------ -----------cation exchange capacity, salinity and pH
What is the soil horizon ---------CORRECT ANSWER-----------------a layer lying below another layer and parallel to the surface Top layer soil profile ---------CORRECT ANSWER-----------------organic layer mixed with minerals Middle layer of soil profile ---------CORRECT ANSWER-----------------weather produced soil with little organic matter When did law requiring Installer 1 license go into effect? ---------CORRECT ANSWER-----------------March 1, 1990 What is evaporation? ---------CORRECT ANSWER-----------------water coming from ground What is transpiration? ---------CORRECT ANSWER-----------------water coming from plants Are bore holes, injection wells or cesspools legal? ---------CORRECT ANSWER-----------------no Can artesian wells be contaminated from bore holes? ---------CORRECT ANSWER-----------------yes
Authorization to construct ---------CORRECT ANSWER-----------------first part of the permit Authorized agent ---------CORRECT ANSWER-----------------delegated the authority by the executive director to implement and enforce the rules Certified professional soil scientist ---------CORRECT ANSWER----------------
- individual who has met the certification requirements of the American Society of Agronomy to engage in the practice of soil science Designated representative ---------CORRECT ANSWER-----------------An individual who holds a valid license to review permit applications, site evaluations, or planning materials, or conduct inspections on on-site sewage facilities. Floodplain (100-year) ---------CORRECT ANSWER-----------------has a 1% chance of flooding each year Gravel-less drainfield pipe ---------CORRECT ANSWER-----------------eight- inch or ten-inch diameter geotextile fabric-wrapped piping product without gravel or media Groundwater ---------CORRECT ANSWER-----------------Subsurface water occurring in soils and geologic formations that are fully saturated either year-round or on a seasonal or intermittent basis
Local governmental entity ---------CORRECT ANSWER----------------- municipality, county, river authority, or special district, including groundwater conservation districts, soil and water conservation districts, and public health districts Maintenance ---------CORRECT ANSWER-----------------Maintenance does not include alterations Maintenance provider ---------CORRECT ANSWER-----------------Through August 31, 2009, a maintenance company is a person or business that maintains on-site sewage facilities for compensation Malfunctioning OSSF ---------CORRECT ANSWER-----------------on-site sewage facility that is causing a nuisance or is not operating in compliance On-site sewage disposal system ---------CORRECT ANSWER----------------- does not treat more than 5,000 gallons per day, only used for disposal of sewage from site. Professional engineer ---------CORRECT ANSWER-----------------Texas Board of Professional Engineers to engage in the practice of engineering in the State of Texas Professional sanitarian ---------CORRECT ANSWER-----------------individual registered by the Texas Department of State Health Services to carry out educational and inspection duties in the field of sanitation
Health and Safety Code, Chapter 366 ---------CORRECT ANSWER----------- ------Updated February 7, 2017 On-Site Sewage Facilities, Title 30, TAC Chapter 285 ---------CORRECT ANSWER-----------------Effective December 29, 2016 Occupational Licenses and Registrations, Title 30, TAC Chapter 30, Subchapters A and G ---------CORRECT ANSWER-----------------Effective September 29, 2016 Major steps in permitting process ---------CORRECT ANSWER----------------- Site/soil evaluation Select OSSF system System planning Submit for permit Review permit application Authorization to construct issued Construction Inspection Notice of approval What types of criminal offenses are related to OSSF ---------CORRECT ANSWER-----------------misdemeanor in accordance with Chap 7 Texas Water Code and Chapter 12.23 of Texas Penal Code Max allowable slope for less than 20 ft ---------CORRECT ANSWER---------- -------Stable Rock (Vertical)90* Type A (3/4:1) 53* Type B (1:1) 45* Type C (1.5:1) 34*
What is not an effective way to warn traffic about construction --------- CORRECT ANSWER-----------------Anything that doesn't catch attention, like construction equipment. Must have movement by a person or flashing lights What are 4 safety concerns when channeling traffic thru a work area --------
- CORRECT ANSWER-----------------pre warn, sign properly, regulate speed, guide properly What is the angle of repose ---------CORRECT ANSWER-----------------an angle closest to perpendicular at which the soil remains at rest how far ahead must someone call Texas One Call before digging with mechanical equipment ---------CORRECT ANSWER-----------------2 working days excluding weekend and holiday Three types of infection risk ---------CORRECT ANSWER-----------------hep A, leptospirosis and parasites Dangers of confined space rescues ---------CORRECT ANSWER-------------- ---Almost 60% of fatalities involved would be rescuers Cubic feet to Cubic Yards ---------CORRECT ANSWER-----------------divide by 27
Bottom layer of soil profile ---------CORRECT ANSWER----------------- unweathered bedrock What is Class 1a soil ---------CORRECT ANSWER-----------------sandy with 30% or more gravel- unsuitable for drainfield use What is Class 1b soil ---------CORRECT ANSWER-----------------sandy What is class 2 soil ---------CORRECT ANSWER-----------------coarse loam What is class 3 soil ---------CORRECT ANSWER-----------------fine loam, sandy clay What is class 4 soil ---------CORRECT ANSWER-----------------clay- unsuitable for drainfield use Slope unsuitable for drainfield ---------CORRECT ANSWER----------------- over 30% or complex slopes Cannot have unsuitable soil within how many feet of sidewall or bottom of excavation ---------CORRECT ANSWER-----------------2 feet (excepted lined ET)
For suitable construction, how many feet away from restrictive horizon must you be ---------CORRECT ANSWER-----------------2 feet Gravel in soil for drainfield ---------CORRECT ANSWER-----------------less than 30% if gravel > 2mm or over 80% of gravel must be < 5mm Can you have evidence of groundwater within 2 feet of excavation --------- CORRECT ANSWER-----------------No What kind of flood hazard can you have for drainfield? ---------CORRECT ANSWER-----------------None Mottles can help determine seasonally saturated soil ---------CORRECT ANSWER-----------------true What is infiltration ---------CORRECT ANSWER-----------------the entry of water into soil What is permeability ---------CORRECT ANSWER-----------------the ease at which liquid can move in soil, effected by properties of soil like aggregation of structural units What are the 3 properties to characterize soil ---------CORRECT ANSWER- ----------------texture, drainage/groundwater presence and depth/ restrictive horizon
Minimum distance for tank and distribution field ---------CORRECT ANSWER-----------------public water well 50/150 feet public or private water line 10/10 feet streams, ponds, etc 50/75 feet (except LDP is 25ft) foundations 5/5 feet easements 1 foot total slope where seepage may occur 5/25 feet Edwards aquifer 50/150 feet Formula for calculating slope ---------CORRECT ANSWER----------------- difference in elevation over distance multiplied by 100 ex: high point 15 feet, distance 200 feet = 0.75 x 100= 7.5% slope Formula for drop in inches of pipe, if grade is known ---------CORRECT ANSWER-----------------% slope/100 times distance ex drop in inches of 0.33% grade over 150 feet 0.33/100 = .0033ft times 150 ft = 0.495 ft 0.495 ft x 12inches per foot = 5.9 inches What should a lot design and installation evaluation include --------- CORRECT ANSWER-----------------lot size, soil and geologic conditions, topography and slope, setbacks, flood hazards What is a common reason for soil absorption system failure --------- CORRECT ANSWER-----------------lot size too small What is a serious threat when a system fails in urban or suburban area? --- ------CORRECT ANSWER-----------------threat of waterborne disease
When minimum lot size cannot be met, system must be designed by --------
- CORRECT ANSWER-----------------Professional Engineer or Professional Sanitarian What is the most critical soil characteristic ---------CORRECT ANSWER------ -----------the ability to absorb wastewater Where does most of the wastewater treatment occur ---------CORRECT ANSWER-----------------In the soil, not the tank What is the primary criteria for OSSF selection ---------CORRECT ANSWER-----------------it will function properly What are some secondary criteria for selecting an OSSF ---------CORRECT ANSWER-----------------cost, minimal maintenance, simplicity of operation, long term reliability System loading needs to be equal to or less than what ---------CORRECT ANSWER-----------------System Capacity Typical wastewater composition ---------CORRECT ANSWER----------------- Total solids 700-1,000 mg/L Total suspended solids 180-300mg/L Total Nitrogen 40-50mg/L Grease 90-110 mg/L
In a well operating system, where will most of scum and solids be removed from ---------CORRECT ANSWER-----------------first chamber How high above tank operating level should inflow line be? --------- CORRECT ANSWER-----------------At least 3 inches Where should the entry point for final outlet be? ---------CORRECT ANSWER----------------- 25 - 50% of depth below surface Why should fittings be made of stainless steel? ---------CORRECT ANSWER-----------------to resist corrosion from anaerobic environment When do you need to install a riser ---------CORRECT ANSWER--------------- --when depth from surface to tank exceed 12 inches What is minimum depth of liquid in tank? ---------CORRECT ANSWER------- ----------30 inches Gravity flow septic systems need how many inches of drop from outlet to disposal field? ---------CORRECT ANSWER-----------------12 inches What materials can sewer line from house be made of? ---------CORRECT ANSWER-----------------cast iron, high strength pipe or schedule 40 under driveway, can also use SDR 26 elsewhere
Pipe diameter from house to tank must be at least how many inches? ------- --CORRECT ANSWER-----------------At least 3 inches Minimum slope from sewer line from house ---------CORRECT ANSWER---- -------------No less than 1/8 inch per foot or 1% slope Where should additional cleanouts be located? ---------CORRECT ANSWER-----------------within 5 feet of 90* bend and every 100 ft of straight pipe The reserve capacity in a tank is ---------CORRECT ANSWER----------------- the volume above the tank alarm Reserve capacity is equal to ---------CORRECT ANSWER-----------------1/ days flow in gallons When are dual pumps required ---------CORRECT ANSWER----------------- when daily flow is over 1,000 gallons per day How should electrical wires be installed? ---------CORRECT ANSWER------- ----------UL, according to National Electric Code, in approved junction boxes and non metallic grey pipe with visible disconnect
