WOSSA Septic Installer Practice Test

These questions are part of the practice quiz. Start practicing

• What is one of the WAC requirements for testing the water-tightness of a holding tank after installation?
• For down-gradient cuts or banks with at least 5 ft. of undisturbed soil above a restrictive layer, what is the required setback from the edge of the drain field?
• What does moderated structure in soil indicate?
• Which is an example of a source of gray water?
• What is the required setback distance for a public drinking water spring from the edge of a drain field?
• For what distance must non-perforated distribution lines be from the edge of a drain field?
• What is the water table?
• Why is record drawing important for sewage systems?
• Which type of sewage disposal design will not be approved by the local health officer?
• In terms of placement, how should the mound be aligned on sloping sites?
• In a septic system, what does the term "surge capacity" refer to?
• What must the supporting surface for a membrane liner be?
• What is a BED in relation to an on-site sewage system?
• What must be installed in a gravity sewer pipe from the sand filter to the drainfield?
• What measurement criterion is referenced in conjunction with the septic tank's liquid level?
• What is the simplest method for distributing effluent in a septic system?
• What does the term effluent refer to in sewage systems?
• What is a trench in the context of septic systems?
• What is the maximum flow rate from the pump that must not be exceeded?
• Which of the following methods can be used for sewage disinfection?
• What is the required minimum setback for down-gradient drains from the edge of a reserve drain field?
• According to WAC, where should mound systems NOT be constructed?
• What category does intermittent sand filters fall under in the Department of Health's list of treatment technologies?
• What type of system must be installed before a pressure distribution system?
• When must special care be given in the design of mounds according to the slope?
• What is the procedure for disposing of contaminated filter media from a used filter?
• In terms of OSS, what is a "well" used for?
• The clarified zone in the tank must be at least how many inches?
• What typical diameter do the laterals in a pressure distribution system usually have?
• What is a key consideration when installing a mound sewage system?
• What type of layer in soil can support root growth in a sewage system?
• During the excavation and construction of an on-site sewage system, what is expected of the installer?
• Which type of soils is pressure distribution suitable for?
• Why is preliminary pretreatment necessary in pressure distribution systems?
• Which component's placement must be checked to ensure alarm activation according to a plan?
• What does industrial waste primarily consist of?
• What should be done if the site does not allow for a "long and narrow" mound design?
• What must the construction materials of the holding tank withstand?
• What is the required setback for surface water from an in-ground swimming pool?
• How many gallons must the lowest liquid level (pump off) be in the minimum size septic tank?
• Which soil type includes loamy coarse sands and loamy medium sands?
• What should be verified regarding the timer off time in a timed dose system?
• What does a building sewer refer to?
• What must be ensured about the high water alarm in a pressure distribution system?
• The volume of a septic tank serving a residence must accommodate what?
• What potential issue arises from sites with level surfaces?
• The screening in the pump vault must have a minimum wetted open area of:
• Which is a critical aspect of the mound system construction process mentioned in relation to design?
• In what scenario is pumping most likely required in a pressure distribution system?
• What does organic content in cover material need to be limited to?
• When must the pump vault perform to its specifications?
• How is the distribution of effluent to the soil dispersal component controlled?
• How much additional liquid tank volume is required for each bedroom over 4 in a single-family residence?
• What slope must be maintained for the bottom of the pit in an intermittent sand filter system?
• What installation guideline should be followed during the construction of pressure distribution systems?
• What does a record drawing represent in the context of sewage systems?
• What must the squirt height difference not exceed between orifices on any one lateral?
• What method is used to dispense influent over the media in intermittent sand filters?
• What is the minimum specification for a sand filter liner according to the system designer?
• What is the primary function of treatment components in an on-site sewage system?
• What is the maximum allowable variation in orifice discharge rates within any one lateral?
• What characterizes the media used in intermittent sand filter systems?
• What ensures that the installation of an OSS prevents surface water from accumulating?
• Which of the following is used to match site conditions with treatment components?
• What solid size must the integral screening of the pump vault prevent from passing?
• What must be verified to ensure the pump delivers the correct dose to the drainfield?
• What is the primary purpose of the pump chamber in a septic system?
• What are rock fragments defined as in this context?
• What is typically required of soils under less-than-ideal conditions for mound systems?
• Why are sites with large trees less desirable for mound installations?
• Where should mound systems NOT be installed?
• What is the minimum volume requirement for a sewage tank treating non-residential sources?
• How must the boot outlet be positioned during installation of the containment vessel in an intermittent sand filter system?
• For up-gradient interceptor drains, how far must they be set back from the sewage tank?
• What happens if the dose volume exceeds the water holding capacity of the filter media?
• What is the minimum original soil depth specified for a mound preceded by a treatment technology identified for Treatment Level A?
• Which of the following is NOT a goal of using pressure distribution systems?
• Which process is used to destroy pathogens in sewage?
• What setback is required from non-perforated distribution lines?
• What does the installation of a holding tank sewage system require for cleaning sewage spills?
• Which statement correctly describes the role of the sewage pumper/hauler in an HTSS?
• Which of the following is NOT required for septic tank design?
• What is the required setback distance from the edge of a drain field for up-gradient foundation drains?
• Which of the following statements is true regarding mound placement?
• What is defined as 'septage' in the context of sewage systems?
• Which of the following causes potential abrasion to a membrane liner?
• What does Total Nitrogen refer to in water quality assessment?
• Which method can help overcome some challenges of localized distribution in septic systems?
• What distinguishes Public domain technology?
• Why must the effluent quality from the pump vault be carefully monitored?
• What is the significance of the operating capacity being lower than the design flow?
• What is the minimum number of monitoring ports required for each mound system?
• What is required for the distribution of effluent in a mound system?
• Which statement most accurately describes sewage?
• What is one key performance standard for timed dose systems in pressure distribution?
• What is the minimum residual pressure required for systems with orifices measuring 3/16 inch or larger?
• What is the primary factor in determining the configuration of a mound system?
• What is meant by maintenance in the context of on-site sewage systems?
• Which aspect is NOT a part of the WAC requirements for holding tank inspections?
• What is the consequence of frequent dosing (greater than 12 doses/day) in septic systems?
• What must be done before covering the installation of an on-site sewage system?
• What is the minimum vertical separation requirement for intermittent sand filters used in certain soil types?
• What is the minimum land area requirement outlined for intermittent sand filters in WAC 246-272A?
• How are design allowances for soil dispersal components determined?
• What might be a concern with a sewage treatment that is Proprietary?
• Which of the following best defines a Public sewage system?
• Which specification has a lower water holding capacity in septic systems?
• What is a key advantage of using pressure distribution in septic systems?
• Which condition is indicated by "times dosing" in a sewage system?
• What is required for an outlet baffle screen or filter in terms of maintenance?
• What is a requirement concerning the size of the pump chamber's riser?
• Which characteristic is essential for the construction of a pump vault?
• What must be done to avoid deterioration of a membrane liner from weather exposure?
• What is a potential risk when installing a mound system over excessively permeable soils?
• When should a trench be backfilled with a clay mix or bentonite mix dam?
• How can stabilization of contaminated filter media be achieved?
• What is the setback distance for drainage ditches up-gradient of the sewage tank?
• What is a common application for mound systems regarding site slope?
• Under WAC 246-272A-0250, who is permitted to construct an OSS?
• What is a key requirement for an intermittent sand filter system in terms of its location?
• What is the size range of drainrock used in septic systems?
• What is specifically prohibited by WAC regarding the discharge of effluent from intermittent sand filters?
• What is required prior to the installation of a mound system?
• What is a requirement for installers when making changes to an approved septic system design?
• What is the squirt height required for a 1/8 inch orifice size?
• What feature must all pump chambers have according to the standards?
• What is defined as a body of water flowing or contained in natural or artificial unlined depressions for a significant periods of the year?
• What is a necessary step to confirm a timer's functionality in a pressure distribution system?
• What is the purpose of a building drain?
• Where are fecal coliform bacteria commonly found?
• What texture classification corresponds to Soil Type 2?
• What is the primary responsibility of designers when preparing the soil for mound systems?
• What construction feature ensures that the pump vault serves its purpose effectively?
• What happens to the wastewater flow in a septic filter when dose volume is optimal?
• What is an important material characteristic of an outlet baffle screen or filter?
• What kind of soils are not considered gravely?
• Where should one monitoring port be placed in a mound system?
• What does a Planned Unit Development typically include?
• Where should the outlet baffle screen or filter draw liquid from?
• What is the expected treatment performance level of a properly installed intermittent sand filter system?
• What percentage of rock fragments defines gravely soils?
• What is the Ordinary High Water Mark used to identify?
• What could be required for mound installations on slopes greater than 20%?
• What is the minimum distance a decommissioned well should be from the edge of a drain field?
• According to WAC regulations, for mounds using Treatment Level C, what is the minimum original soil depth required?
• With what condition must the pump run in regards to the high water alarm?
• According to inspection standards, how should venting be designed for a holding tank?
• What should be ensured during installation to avoid liner damage?
• Why is field testing of timer run times important in timed dose systems?
• What is expected of a soil dispersal component in septic systems?
• How can pressure distribution systems assist with elevation problems during installation?
• What is required for the lid of a pump chamber?
• What feature in timed dose systems cannot independently activate the pump without a timer?
• For a mound system, where should wastewater ideally be directed?
• What is a requirement for a pump chamber according to application standards?
• What characterizes a massive structure in soil layers?
• In what context is the term sewage typically used?
• What is a requirement for membrane liner patches in containment vessel standards?
• Which of the following is a key requirement for an HTSS's pumping service?
• What is the minimum setback distance from the edge of a drain field for down-gradient interceptor drains?
• For demand dose systems, what must be checked when floats are in water?
• What does the term "expansion" refer to in the context of sewage systems?
• What is the minimum liquid volume required for a sewage tank treating waste from non-single-family residential sources?
• Which of the following features should be included in the design for maintenance of the pump vault?
• What is a reserve area in the context of sewage systems?
• What type of location should be avoided for placing contaminated filter media at grade?
• What can indicate a failed onsite sewage system?
• What type of materials should be used to construct the outlet baffle screen or filter?
• What is the operating capacity of an OSS?
• What is a critical requirement for the watertight installation of septic systems, excluding the soil dispersal component?
• Which component is essential in a pressure distribution system for separating solids from liquids?
• What type of material does drainrock usually consist of?
• What regulation must a septic tank comply with regarding its design?
• What is a requirement for all septic tanks regarding their watertightness?
• Why is understanding the hydraulic loading rate critical in sewage systems?
• How should the soil conditions be characterized for mound system construction?
• For what purpose are mound systems designed with specific filters?
• What is the maximum ground slope on which a mound can be installed using standard construction equipment?
• What is the primary purpose of a "treatment component" in a septic system?
• What impact do fecal coliform bacteria have on sewage systems?
• What is the term for the creation of a new residence or facility that results in sewage production?
• What should landscaping adjacent to a holding tank sewage system accomplish?
• In terms of setbacks, what is measured from the perimeter of the basal area of the filter media?
• What is necessary for monitoring septic tank function according to application standards?
• What constitutes an on-site sewage system (OSS)?
• What is the collected treated effluent from an intermittent sand filter discharged by?
• What must the effluent quality discharged from a pump vault in a single compartment tank compare to?
• What type of layer transition would indicate a shift from a massive to moderated soil structure?
• Where is the ideal location for constructing a mound system?
• What is a main consideration when designing a pressure distribution system?
• For optimal performance, what should an outlet baffle screen or filter be designed for?
• If tree stumps are present at a site, what is the recommended action?
• What is a characteristic of mound systems?
• What must an outlet baffle screen or filter do to protect the effluent pump?
• What is a critical design feature regarding tanks in high groundwater conditions?
• What is the appropriate setback from the edge of a drain field for adjacent soil dispersal components?
• What could be a consequence of demand dosing in subsurface drip drainfields following intermittent sand filters?
• What minimum depth of sand is required to cover the bottom of the pit in an intermittent sand filter system?
• How many beds are permitted on the same downhill plane if the total bed width exceeds the specified maximum?
• What is the recommended backfill material depth for proper grading around an on-site sewage system?
• Why must installations avoid extreme temperatures?
• In what condition may a larger mound area be justified?
• What type of soil conditions would "very gravely" soil be categorized under?
• What does the hydraulic loading rate measure?
• Which of the following distances is required for a sewage tank from the edge of the drain field?
• What is the minimum liquid volume requirement for a septic tank serving a single-family residence with 3 bedrooms?
• What is one type of calculation that must be considered for maximum hydraulic loading rate?
• What is a pumper in the context of on-site sewage systems?
• How is residential sewage characterized?
• Which of the following entities is NOT an example of a management entity for mound systems?
• What materials are recommended to secure the boot to the underdrain outlet pipe?
• What is a key requirement for seam bonding in wet conditions?
• What does the term "times dosing" refer to in septic systems?
• What is the significance of monitoring wells in OSS?
• What must be obtained prior to beginning construction of an OSS?
• What method is required to secure the lids and covers of a holding tank?
• What is the definition of a cut or bank in terms of slope?
• Who qualifies as a "Person" under septic system regulations?
• In preparation for a final inspection, what is the recommended action regarding the pump chamber?
• What is a "treatment component" in the context of septic systems?
• Which WAC code specifies the vertical separation requirements for mound systems?
• How can wind impact the installation of liner materials?
• What type of discharge is prohibited from an intermittent sand filter?
• Which method of distribution is typically used after an intermittent sand filter?
• What requirement must be followed when installing the boot of an intermittent sand filter system?
• What is a primary purpose of the Holding Tank Sewage System?
• What is required for upslope runoff in relation to mound systems?
• What is the function of a drainfield in a septic system?
• Which material should be used at the bottom of the pit to protect the liner?
• How far should surface water be from the edge of the drain field?
• For a mound that has a minimum of 24 inches of media depth, under what conditions can it be used on a site?
• What is the primary concern regarding overflow in a Holding Tank Sewage System?
• What defines groundwater?
• What is the primary purpose of a pressure distribution system in septic installations?
• What is one purpose of securing access points in a holding tank system?
• What is the minimum setback distance for wells from the edge of a drain field?
• The first compartment of a septic tank must have a liquid volume equal to what fraction of the total liquid volume?
• Which of the following factors can affect the performance of a mound sewage system?
• What does a conforming system indicate?
• In septic system design, what is a key factor of Pressure distribution systems?
• What is the purpose of non-reinforced liners in an intermittent sand filter system?
• What does "very gravely" soil contain by volume?
• Which factor is essential for the design of the underdrain in an intermittent sand filter system?
• What type of dosing method is beneficial for a mound system?
• Which construction material property is essential for the holding tank sewage system?
• What is the required distance a sewage tank should maintain from an inspection box?
• What issue can arise from localized distribution in a gravity flow system?
• Which WAC section provides the minimum horizontal setback distances for soil dispersal components?
• For a single-family residence with 4 bedrooms, what is the required minimum liquid tank volume in gallons?
• What criteria must be followed for a boot installation through the PVC-lined wall?
• To promote unsaturated film-like flow in a septic system, what is required regarding dose volume?
• Which of the following describes the "treatment level" in septic systems?
• What is a key characteristic of the dosing system in intermittent sand filters?
• What component of an on-site sewage system is exempt from watertight requirements?
• What setback is required for other site features that may allow effluent to surface down-gradient from the sewage tank?
• What is a primary use of pressure distribution systems in septic installations?
• What is the purpose of having a two-compartment septic tank?
• What does the non-buoyancy requirement in high groundwater areas ensure?
• What is the minimum additional emergency storage volume required for a pump chamber?
• What is a primary consideration in the design of a pump chamber in pressure distribution systems?
• According to soil type descriptions, what soil is classified as Soil Type 1?
• How many doses per day should a system intended for four doses typically have between off times?
• What adjustment is recommended for improving accuracy when checking float placement?
• What effect does Platy structure have on water movement in soil?
• What is the required depth of soil above the water table for a septic system to function effectively?
• What is a necessary precaution to protect the reserve area of a mound system during construction?
• To minimize strain during installation, what should be done with membrane liners?
• What is critical for ensuring the longevity and efficiency of a mound sewage system?
• What characteristic must a septic tank have regarding seasonal groundwater?
• How much hydraulic detention time is required in the tank?
• What must be done after handling contaminated sand filter media?
• What is the best description of a holding tank sewage system?
• What is necessary for full-time pump submergence in the pump chamber?
• How far must a pressurized water supply line be from a sewage tank?
• What does a restrictive layer in soil do?
• What factor may necessitate using a timer for the subsurface drip drainfield alongside demand dosing?
• What must not exceed when considering liquid level fluctuations in the tank under normal circumstances?
• What is the recommended temperature range for installing membrane liners?
• What is one purpose of the secured lid on a pump chamber?
• Before installation and use of a pressure distribution system, what permits must be obtained?
• What comprises cover material in sewage systems?
• What treatment performance can a properly maintained mound system achieve at minimum?
• What does the presence of high water tables impact regarding mound systems?
• Which type of materials may be used as media in intermittent sand filter systems?
• For the effective operation of an HTSS, what is essential concerning the holding tank?
• What must installers have in their possession during the installation of an OSS?
• What minimum cover is required when burying contaminated filter media?
• What should be done first if problems are discovered during the functional testing of a timed dose system?
• Before a mound system can be installed, what sort of background research might be needed?
• Which of the following is NOT a requirement for the pump vault?
• What type of sealant is recommended for securing the boot in the containment vessel?
• What is a significant disadvantage of localized distribution in septic systems?
• What does the acronym USEPA stand for?
• How does seasonality affect the design and function of on-site sewage systems?
• What potential issue could arise in slowly permeable soils under mound systems?
• How many times should dosing occur in a 24-hour period for intermittent sand filters?
• From what distance should building foundations be set back from the edge of a drain field?
• What is the minimum size requirement for a septic tank as per standard regulations?
• What is the requirement for sizing the boot in an intermittent sand filter system?
• What specification must the gravity sewer pipe meet when connecting the sand filter to the drainfield?
• What maximum variation in orifice discharge rates is acceptable over the entire pressure distribution system?
• What is one of the primary goals of a pressure distribution system?
• In what context are intermittent sand filters typically used as part of a mitigation strategy?
• Who is considered an installer in the context of sewage systems?
• What is a Holding Tank Sewage System (HTSS) designed to do?
• Which of the following describes the requirement for grading in the construction of a mound system?
• What should the design intent of pressure distribution systems aim to achieve?
• In addition to the initial installation permit, what does WAC require for mound systems?
• What is a key requirement for the disposal of contaminated filter media in intermittent sand filter systems?
• What is the minimum depth of undisturbed soil required for the placement of a mound after site development is complete?
• Which term describes the periodic or continuous surveillance of an on-site sewage system?
• Which department oversees health-related matters regarding septic systems in Washington State?
• What role does septage play in the sewage management process?
• What setback distance is required for a public drinking water well from a sewage tank?
• What aspect is NOT required for the screening of effluent in septic tanks?
• Which aspect of the pump chamber's riser is crucial to prevent odors?
• What benefit does pressure distribution provide for the treatment performance of a drainfield?
• What is necessary to justify an increase in mound size when dealing with obstruction like stumps?
• Who is the local health officer?
• What does the design of a mound system primarily address?
• Which factor is NOT considered when assessing the conditions for mound installation?
• What type of facility is required for the disposal of a holding tank's contents?
• What is a critical feature of the pump chamber regarding its materials?
• What characterizes Platy structure in soil?
• What is a requirement for an on-going service contract related to mound systems?
• What minimum clearance should be maintained between the bottom of the scum layer and the entrance to the screening device?
• What critical element must be included in the permit for an HTSS?
• How far should a sewage tank be from the building sewer?
• What must be leak-proof according to the holding tank sewage system inspections?
• What type of flow is required for the proper functioning of intermittent sand filters?
• Who is responsible for matching site and soil characteristics with approved components in septic system design?
• What type of issues must be addressed in the design of the pump chamber-to-mound transmission line?
• What does Pressure distribution in septic systems refer to?
• How is "unit volume of sewage" defined for a single family residence?
• Which type of tank must the pump chamber receive effluent from?
• Which factor does NOT influence the loading rate for residential effluent using gravity or pressure distribution?
• What is the ideal condition for installing liners in an intermittent sand filter system?
• What does the pump chamber's construction aim to prevent?
• What does the term repair mean in relation to on-site sewage systems?
• Which of the following is NOT a characteristic required for all septic tanks?
• What is essential for the installation of a mound system to avoid system failure?
• What is the initial step for verifying the time required to send a full dose to the drainfield in timed dose systems?
• What is one performance criterion that an outlet baffle screen or filter must meet?
• Which of the following is NOT a design consideration for the distribution system in a mound system?
• What is the setback requirement for a public drinking water well from a non-perforated distribution line?
• What does design flow refer to in a septic system context?
• How far must down-gradient other site features be set back from a sewage tank?
• What is the maximum allowable squirt height difference for the entire pressure distribution system?
• What is a primary benefit of Planned Unit Development?
• What is a cesspool?
• What does WAC 246-272A pertain to?
• Who must inspect a holding tank sewage system before it can be used?
• What is the minimum setback distance from the edge of a drain field for springs?
• What does WAC 246-272A-0010 pertain to in terms of pressure distribution systems?
• Why might leak testing be required for a pump chamber?
• How much surge volume is required for handling emergency situations?
• What must the design of the soil dispersal component comply with?
• What must be confirmed if the depth of soil to a water table is less than 18 inches?
• To ensure proper function, what must the mound system be protected from?
• What should the settings of the timer reflect in order to ensure correct dosing?
• What is required for a soil to exhibit a moderated structure?
• What size is associated with the minimum liquid level in a septic system?
• What is the recommended shape of the infiltration bed in mound systems?
• Why are intermittent sand filters essential in shallow soil conditions?
• What must precede a pressure distribution system according to application standards?
• Who typically approves septic systems and components?
• What should the design standards of a pump vault facilitate?
• What can excessively permeable soils lead to in mound systems?
• What is a key characteristic of the designer's role in septic system planning?
• What is the primary function of intermittent sand filters as it relates to wastewater?
• Which of the following components must only be installed if approved by the department?
• What does "failure" indicate in on-site sewage systems?
• What is the purpose of distribution technology in an on-site sewage system?
• What is meant by a Proprietary product in regards to sewage technology?
• What is the acronym TSS commonly used to represent?
• What must the installation of the boot ensure regarding water containment?
• What is the minimum dosing frequency for a septic system using coarse sand media?
• What does 'approved' signify in septic installation terminology?
• The pump vault must extract liquid from which zone of the septic tank?
• What is the ideal configuration for mound systems on sloping sites?
• What must be included in the construction plan for a mound system?
• What action should be taken if contaminated filter media needs to be disposed of at a landfill?
• What is the purpose of monitoring an on-site sewage system?
• What is the primary characteristic of expanding clay?
• What is a Professional Engineer defined as?
• What ensures maximum contact between organics in effluent and microbial growth on filter media?
• Why is pressure distribution important in aquifer sensitive areas?
• What does gray water consist of?
• When is the installation of a reserve area necessary?
• For residential sewage systems treating waste, what is the volume requirement per bedroom?
• What design practice should be considered for mound systems in relation to drainage?
• What is the definition of an additive in the context of septic systems?
• How far must down-gradient cuts with less than 5 ft. of soil above a restrictive layer be set back from the edge of a drain field?
• What is one of the requirements for all septic tanks concerning service access?
• What does the term "Ped" refer to in soil science?
• What is one potential advantage of utilizing pressure distribution in sandy soils?
• How frequently should the outlet baffle screen or filter be serviced compared to other system components?
• When should a permit be held for a wet season evaluation of a septic system site?
• Which aspect is crucial for the overall installation of the underdrain in a sand filter system?
• Under what condition can pressure distribution technology be permitted for public use?
• What is the definition of infiltrative surface?
• What effect does wastewater travel through 2-4 feet of suitable soil have on treatment performance?
• Which document outlines the minimum setback requirements for intermittent sand filters?
• Which of the following is NOT typically part of the design flow considerations?
• What are seepage pits designed to do?
• What kind of system must follow the intermittent sand filter to discharge effluent into the soil?
• What is the primary regulation requiring pressure distribution for certain conditions?
• The internal volume of the pump chamber must be sufficient to provide which of the following?
• What is a holding tank sewage system?
• What is the definition of extremely gravely soil?
• What aspect of pit construction must be ensured regarding the sides of the pit?
• Which of the following soil types excludes soil types 5 and 6 from classifications?
• What should be done if precipitation affects field seaming during liner installation?