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CPSWQ practice questions

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Question 1Construction stormwater program

Under the federal Construction General Permit framework, which document must be prepared before construction begins and describes the site-specific practices that will control pollutants in stormwater discharges?

  1. Total Maximum Daily Load (TMDL) allocation
  2. Stormwater Pollution Prevention Plan (SWPPP) Correct answer.
  3. Clean Water Act section 404 permit
  4. National Pollutant Discharge Elimination System (NPDES) general permit

Explanation

The SWPPP is the site-specific plan identifying pollutant sources and the best management practices (BMPs) that will be implemented to control stormwater discharges from the construction site. It must be prepared and certified before construction activity begins. The NPDES permit is the regulatory authorization itself, not the site plan.

Question 2Construction stormwater program

A construction operator intends to use the EPA Construction General Permit. Which threshold typically determines whether permit coverage is required based on land disturbance?

  1. Any disturbance of any size regardless of area
  2. Disturbance of ten or more acres only
  3. Disturbance of five acres only within a floodplain
  4. Disturbance of one or more acres, or less than one acre if part of a larger common plan Correct answer.

Explanation

The Construction General Permit applies to construction activities disturbing one acre or more of land, including activities disturbing less than one acre that are part of a larger common plan of development or sale. The acreage threshold is the key trigger for permit coverage.

Question 3Construction stormwater program

During a site inspection, an inspector finds that a silt fence has been installed along a property boundary where sheet flow exits the site. What is the primary function of this BMP?

  1. To convey concentrated channel flow across the site without erosion
  2. To treat dissolved pollutants through chemical filtration
  3. To intercept and detain sheet flow so sediment settles before runoff leaves the site Correct answer.
  4. To stabilize the soil surface permanently with vegetation

Explanation

Silt fence is a perimeter sediment control practice designed to intercept sheet flow, slow it, and allow sediment to settle out before runoff discharges from the disturbed area. It is not intended for concentrated flow, which would quickly undermine or bypass the fabric.

Question 4Construction stormwater program

Which practice is an example of a source control rather than a treatment control for construction stormwater?

  1. Covering exposed soil stockpiles with tarps Correct answer.
  2. Using a flocculant in a sediment trap
  3. Installing a sediment basin at the discharge point
  4. Routing runoff through a vegetated filter strip

Explanation

Source controls prevent pollutants from contacting stormwater in the first place; covering stockpiles keeps rain from mobilizing sediment. Treatment controls, by contrast, remove pollutants after they have entered runoff.

Question 5Construction stormwater program

The EPA Construction General Permit requires the SWPPP to be signed and certified by which party?

  1. A corporate officer or other authorized signatory of the operator Correct answer.
  2. The supplier of erosion control materials
  3. The general contractor's on-site foreman
  4. The local building inspector

Explanation

The SWPPP must be signed and certified by a person authorized to make management decisions for the operator, typically a corporate officer or similar official. This certification attests that the plan complies with permit requirements.

Question 6Construction stormwater program

A site has 12 acres of disturbance and a daily maximum total maximum daily load (TMDL) limit for sediment. Which permit consideration is most directly triggered by this condition?

  1. Additional effluent limits or BMP requirements tied to the TMDL waste load allocation Correct answer.
  2. Elimination of the requirement for a SWPPP
  3. Conversion of the project to an individual section 404 permit
  4. Automatic exemption from all stormwater sampling

Explanation

When a receiving water has an applicable TMDL, the permit typically incorporates the waste load allocation as an enforceable limit and may require more stringent BMPs or monitoring. The TMDL adds requirements; it does not remove the SWPPP or sampling obligations.

Question 7Construction stormwater program

An inspector observes that a concrete washout pit is located 15 feet from a storm drain inlet and has no liner. Which corrective action best addresses the identified deficiency?

  1. Add more water to the pit to dilute the concrete residue
  2. Leave the pit in place and schedule cleaning at project closeout
  3. Install a silt fence around the storm drain inlet only
  4. Relocate the washout away from the inlet and line it to contain wash water and solids Correct answer.

Explanation

Concrete washout must be located away from drainage features and constructed to contain wash water so high-pH liquids and solids do not enter stormwater. Relocating and lining the pit addresses both the proximity and containment deficiencies.

Question 8Construction stormwater program

Which inspection frequency is typically required under the EPA Construction General Permit for a site that is actively disturbing soil and is not in a frozen or arid condition?

  1. Only after a citizen complaint is received
  2. At least once every seven calendar days, or once every 14 days with a qualifying rain event Correct answer.
  3. Once per month regardless of conditions
  4. Once at the start and once at the end of the project

Explanation

The permit generally requires inspections at least once every seven calendar days, with an alternative of once every 14 calendar days plus within 24 hours after a qualifying rain event. Inspections verify that BMPs are installed and functioning.

Question 9Construction stormwater program

After a qualifying rain event, an inspection finds that a sediment basin is at capacity with accumulated sediment and the riser is partially blocked. What is the most appropriate response?

  1. Remove accumulated sediment and clear the riser promptly, documenting the corrective action Correct answer.
  2. Wait until the next scheduled weekly inspection to address it
  3. Discharge the basin by pumping to the nearest ditch
  4. Record the condition in the log without taking action

Explanation

A sediment basin that cannot function because of accumulated sediment or a blocked outlet poses a discharge risk and must be corrected promptly. The corrective action and the date it was completed should be documented in the inspection records.

Question 10Construction stormwater program

A project is located in an arid region where rainfall is infrequent. How does the permit typically adjust inspection requirements for such a site?

  1. Inspections are replaced by a single annual self-certification
  2. Inspection frequency increases to daily in arid regions
  3. No inspections are required at any time in arid regions
  4. Inspections may be reduced when the site is in a qualifying arid or frozen condition, but must resume when conditions change Correct answer.

Explanation

The permit allows reduced inspection frequency when the site is subject to arid conditions or frozen ground, provided the operator documents the basis. Once conditions change, such as when rain is forecast or ground thaws, the standard inspection schedule resumes.

Question 11Construction stormwater program

Which record is the operator required to maintain and make available to the permitting authority upon request?

  1. Only the original permit application
  2. Inspection reports, SWPPP modifications, and monitoring data Correct answer.
  3. Only payroll records of equipment operators
  4. Only the project's construction schedule

Explanation

The permit requires operators to retain inspection reports, records of SWPPP modifications, and any required monitoring data, and to make them available to regulators. These records demonstrate compliance over the life of the project.

Question 12Construction stormwater program

A site's SWPPP identifies a vegetated buffer as a perimeter control, but grading has removed the vegetation. What is the best interpretation of this situation for compliance purposes?

  1. Removing vegetation automatically satisfies the buffer requirement
  2. The operator may ignore the deficiency until final stabilization
  3. The buffer still counts because it was listed in the SWPPP
  4. The BMP is no longer functioning as designed, so the SWPPP must be revised and a replacement control installed Correct answer.

Explanation

BMPs must be maintained in effective operating condition; if a listed practice is destroyed by grading, the operator must install an equivalent control and update the SWPPP to reflect changed conditions. Listing a practice in the plan does not substitute for actually maintaining it.

Question 13Construction stormwater program

Which stabilization standard generally applies to areas of a construction site where earth-disturbing activities have permanently ceased?

  1. Stabilize only if the area exceeds five acres
  2. Initiate stabilization immediately and complete it within 14 days of the cessation Correct answer.
  3. Stabilize within one year of project closeout
  4. No stabilization is required if the area will be paved later

Explanation

The permit requires operators to initiate soil stabilization as soon as practicable after earth-disturbing activities permanently cease, and to complete it within 14 days. Final stabilization prevents ongoing sediment loss from inactive areas.

Question 14Construction stormwater program

An operator plans to discharge hydrostatic test water from a new water main into a nearby stream. What is the most appropriate compliance approach?

  1. Evaluate the discharge under the permit, treat or dechlorinate as needed, and prevent sediment and pollutants from entering the stream Correct answer.
  2. Store the test water indefinitely without discharge
  3. Discharge only at night to reduce visibility
  4. Discharge directly because test water is potable

Explanation

Non-stormwater discharges such as hydrostatic test water are only allowable if authorized and if pollutants, including chlorine and sediment, are controlled. The operator must evaluate the discharge and apply appropriate treatment before release.

Question 15Construction stormwater program

Which practice is most appropriate for stabilizing a steep disturbed slope where concentrated runoff is expected at the toe?

  1. Place a silt fence at the top of the slope only
  2. Apply erosion control blanket or hydromulch and install energy dissipation at the toe Correct answer.
  3. Leave the slope bare and rely on a downstream sediment basin
  4. Pave the slope surface to prevent erosion

Explanation

Steep slopes need surface protection such as erosion control blankets or hydromulch to reduce raindrop impact and rill erosion, and concentrated flow at the toe requires energy dissipation. Combining these practices addresses both the slope face and the discharge point.

Question 16Construction stormwater program

An inspector must determine whether a discharge from a construction site is causing or contributing to a violation of a water quality standard. Which approach best supports that determination?

  1. Estimate pollutant loading solely from the acreage disturbed
  2. Rely on the design capacity of the sediment basin
  3. Collect representative samples of the discharge and compare results with applicable water quality standards Correct answer.
  4. Ask the contractor whether the discharge looks clear

Explanation

Determining whether a discharge causes or contributes to a water quality standards violation requires representative sampling and comparison with the applicable standards. Visual observation or design assumptions cannot establish the pollutant concentrations in the discharge.

Question 17Construction stormwater program

A construction site is adjacent to a wetland that is a jurisdictional water. Which stormwater-related requirement most directly applies to the operator's discharge?

  1. Reduce the SWPPP to a one-page summary
  2. Obtain a section 404 permit in place of stormwater coverage
  3. Comply with permit effluent limits and any applicable state or tribal water quality standards for the receiving water Correct answer.
  4. Discharge without treatment because wetlands naturally filter water

Explanation

Stormwater discharges to jurisdictional waters remain subject to NPDES permit conditions and applicable water quality standards, including those protecting wetlands. A section 404 permit addresses fill placement and does not replace stormwater permit obligations.

Question 18Construction stormwater program

An operator discovers that a subcontractor has been washing paint equipment into a storm drain. Which sequence best reflects proper corrective action?

  1. Dilute the paint with water and allow it to drain
  2. Continue work and note the activity in the next monthly report
  3. Report the incident only if a regulator observes it
  4. Stop the discharge, contain and clean up the material, document the incident, and revise controls and training to prevent recurrence Correct answer.

Explanation

Illicit discharges must be stopped immediately, the released material contained and cleaned up, and the event documented. The operator should also evaluate why the practice occurred and strengthen controls or training to prevent recurrence.

Question 19Construction stormwater program

Which factor most strongly influences the selection of a sediment basin versus a silt fence for a given disturbed area?

  1. Whether runoff leaves the area as concentrated flow or as sheet flow Correct answer.
  2. The number of construction workers on site
  3. The color of the surrounding soil
  4. The project's total construction cost

Explanation

Sediment basins are designed to detain concentrated runoff and allow settling, while silt fence is suited to sheet flow along the perimeter. The flow regime is therefore a primary determinant in choosing between them.

Question 20Construction stormwater program

Which element is essential when writing a SWPPP for a site that will disturb soil near a stream?

  1. A copy of the local zoning ordinance
  2. A list of the contractor's prior projects
  3. A schedule of employee lunch breaks
  4. A site map showing drainage patterns, disturbed areas, and locations of BMPs relative to the stream Correct answer.

Explanation

The SWPPP must include a site map depicting drainage patterns, areas of disturbance, and BMP locations so that controls can be placed to protect the receiving water. This map supports both implementation and inspection.

Question 21Construction stormwater program

What is the purpose of a notice of intent (NOI) in the construction stormwater permitting process?

  1. To request an exemption from all environmental review
  2. To notify neighbors that construction will begin
  3. To transfer ownership of the project site
  4. To request coverage under a general permit before discharging stormwater associated with construction Correct answer.

Explanation

The NOI is the operator's application for coverage under the general permit and is submitted before construction begins. Once coverage is granted, the operator must implement the SWPPP and comply with permit conditions.

Question 22Construction stormwater program

Which statement best describes the role of a qualified person during construction site inspections?

  1. Any employee available at the time of inspection
  2. A representative of the material supplier only
  3. A state inspector who must be present for every site walk
  4. A person knowledgeable in stormwater control measures who can assess whether BMPs are properly installed and functioning Correct answer.

Explanation

Inspections must be performed by a qualified person with knowledge of stormwater control measures and the permit requirements. This ensures deficiencies are correctly identified and appropriate corrective actions are specified.

Question 23Construction stormwater program

A site's SWPPP specifies that a stabilized construction entrance will be maintained. Which maintenance action keeps this BMP effective?

  1. Reducing the entrance width to limit traffic
  2. Replacing the aggregate with native topsoil
  3. Watering the entrance to keep dust down
  4. Periodically adding aggregate and removing tracked sediment from the roadway Correct answer.

Explanation

A stabilized construction entrance relies on a pad of aggregate to knock sediment off vehicle tires; it stays effective when aggregate is replenished and tracked sediment is cleaned from adjacent roads. Native soil or watering would not provide the same sediment removal.

Question 24Construction stormwater program

Which condition most likely indicates that a sediment trap needs maintenance?

  1. Sediment has accumulated to roughly half of the trap's design storage volume Correct answer.
  2. The outlet is free of debris
  3. The trap contains standing water after a storm
  4. The surrounding area has been stabilized

Explanation

Sediment traps must be cleaned when accumulated sediment reduces the available storage to about half of the design capacity, because remaining capacity is needed to capture subsequent storm runoff. Standing water and a clear outlet are normal conditions.

Question 25Construction stormwater program

An operator wants to reduce the frequency of sediment basin cleanouts by increasing the basin's drainage area. What is the primary risk of this change?

  1. The permit will be automatically terminated
  2. Increased runoff volume and sediment loading may exceed the basin's design capacity and reduce treatment efficiency Correct answer.
  3. The basin will automatically become a wetland
  4. Sediment will no longer settle under any conditions

Explanation

A sediment basin is sized for a specific contributing drainage area and design storm; adding drainage area increases inflow and sediment load, which can overwhelm the basin and shorten settling time. Design capacity and contributing area must remain consistent with the approved plan.

Question 26Construction stormwater program

Under the EPA Construction General Permit, an operator must develop a Stormwater Pollution Prevention Plan (SWPPP) before which milestone?

  1. Within 30 days after the first earth-disturbing activity
  2. Before submitting a bid for the construction contract
  3. Before any stormwater discharge from the site begins Correct answer.
  4. After the notice of intent is acknowledged by the permitting authority

Explanation

The CGP requires that the SWPPP be prepared and implemented before the operator commences construction activities and before any discharge of stormwater from the site. The plan must be site-specific and describe the controls that will be installed and maintained.

Question 27Construction stormwater program

A project will disturb 1.5 acres of soil as part of a larger common plan of development totaling 8 acres. How is permit coverage typically determined?

  1. Coverage applies only after all 8 acres are graded simultaneously
  2. Coverage is based on the acreage of the entire common plan of development Correct answer.
  3. Coverage applies only if the individual 1.5-acre parcel is separately permitted
  4. Coverage is waived because the parcel falls below the 1-acre threshold

Explanation

For construction stormwater permitting, acreage is counted across the whole common plan of development or sale, not just the individual parcel being disturbed. Because the combined disturbance exceeds the threshold, permit coverage is required.

Question 28Construction stormwater program

Which practice best describes the required approach to controlling stormwater leaving a construction site?

  1. Relying on dilution in the receiving stream to meet water quality standards
  2. Containing all stormwater on site for the entire construction period
  3. Treating runoff only after it reaches the receiving water
  4. Implementing controls that minimize pollutants in discharges using the best available technology Correct answer.

Explanation

Construction general permits require operators to implement best available technology economically achievable and best conventional pollutant control technology to limit pollutants in stormwater discharges. The controls must be designed and maintained to meet applicable effluent limits.

Question 29Construction stormwater program

An operator must post a notice near the main entrance of a permitted construction site. Which information does that notice primarily communicate?

  1. The daily wage rates for site laborers
  2. The names of the general contractor's bonding company
  3. The permit identification number and the location of the SWPPP Correct answer.
  4. The schedule for municipal trash collection

Explanation

The CGP requires a sign or notice at the site entrance identifying the operator, the permit number, and where the SWPPP can be reviewed. This allows inspectors and the public to connect the site to its permit coverage.

Question 30Construction stormwater program

During a site inspection, an operator finds that a silt fence has been undercut by flow and is no longer ponding runoff. What is the most appropriate immediate response?

  1. Wait for the permitting authority to issue a corrective action order
  2. Repair or replace the fence and restore the disturbed area before the next rain event Correct answer.
  3. Document the deficiency and repair it during the next scheduled quarterly inspection
  4. Remove the failed fence because it is no longer functioning

Explanation

Permits require that stormwater controls be maintained in effective operating condition, and repairs must be made before the next storm event when feasible. Undercut fencing provides no treatment, so prompt repair or replacement is necessary.

Question 31Construction stormwater program

Which document typically must be prepared when construction activities will occur within a certain distance of a receiving water and could affect a listed impairment?

  1. A site-specific construction dewatering permit
  2. A total maximum daily load wasteload allocation analysis for the site Correct answer.
  3. A spill prevention, control, and countermeasure plan
  4. A stormwater pollution prevention plan addendum for endangered species

Explanation

When a site discharges to an impaired water with an applicable TMDL, the permit may require the operator to determine and comply with the wasteload allocation assigned to construction stormwater. This analysis shows how the site will meet the load reduction.

Question 32Construction stormwater program

An operator plans to use a sediment basin as the primary control for a 25-acre disturbed drainage area. What design consideration is most important?

  1. Locating the basin at the highest point of the site to intercept sheet flow
  2. Lining the basin with impermeable material to prevent infiltration
  3. Designing the outlet to discharge at the maximum allowable rate without regard to settling
  4. Ensuring the basin provides the required storage volume and a dewatering mechanism sized for the contributing area Correct answer.

Explanation

Sediment basin performance depends on adequate storage volume and a properly designed outlet that allows detained runoff to settle before release. The design must be scaled to the contributing drainage area and the required storage criteria.

Question 33Construction stormwater program

Which action best demonstrates that an operator has evaluated alternatives to a stormwater discharge that would otherwise be prohibited?

  1. Relying on the receiving water's designated use to justify the discharge
  2. Applying for a variance after the discharge has already begun
  3. Assuming the discharge is allowed because the site has permit coverage
  4. Documenting that no feasible alternative exists after reviewing infiltration and reuse options Correct answer.

Explanation

Permits restrict discharges that would violate water quality standards and require operators to evaluate whether a feasible alternative exists. Documenting the review of infiltration, reuse, and other options supports the determination.

Question 34Construction stormwater program

A site's SWPPP must be updated when which of the following occurs?

  1. A new subcontractor is hired for the same scope of work
  2. The project schedule slips by two weeks
  3. The operator's corporate office relocates
  4. A change in design, construction, operation, or maintenance affects the discharge Correct answer.

Explanation

The SWPPP is a living document that must be modified whenever site conditions or activities change in ways that affect the potential for pollutants to reach stormwater. Changes in design, construction, operation, or maintenance trigger a review and update.

Question 35Construction stormwater program

Which stormwater control is specifically intended to prevent sediment tracked by vehicles from leaving a construction site?

  1. A vegetated filter strip along the perimeter
  2. A floating skimmer in the sediment basin
  3. A check dam in the drainage swale
  4. A stabilized construction entrance Correct answer.

Explanation

A stabilized construction entrance uses aggregate or other durable material to knock sediment off tires before vehicles reach the public road. It is a source-area control aimed at preventing off-site tracking.

Question 36Construction stormwater program

An operator's SWPPP includes a requirement to inspect controls after any rain event that produces a discharge. Which practice best demonstrates compliance?

  1. Recording the inspection date, findings, and corrective actions in the site log Correct answer.
  2. Inspecting only when the operator happens to be on site
  3. Photographing the site once per month regardless of rainfall
  4. Relying on the general contractor's verbal report of conditions

Explanation

Inspections must be documented with the date, the inspector's qualifications, findings, and any corrective actions taken. A written log demonstrates that required inspections occurred and that deficiencies were addressed.

Question 37Construction stormwater program

A concrete washout area is being relocated because the original location is now within a graded area. What should guide the new location?

  1. Placing it in the lowest point of the site to collect all runoff
  2. Choosing a location away from drainageways and inlets with a lined, contained pit Correct answer.
  3. Siting it on the compacted subgrade where vehicles pass frequently
  4. Locating it adjacent to the storm drain inlet for easy rinsing

Explanation

Concrete washout must be contained so that high-pH washwater cannot reach stormwater conveyances. A lined pit placed away from inlets and drainageways prevents the washwater from entering the storm drain system.

Question 38Construction stormwater program

Which statement correctly describes the relationship between the SWPPP and the notice of intent (NOI)?

  1. The NOI summarizes the SWPPP and certifies that the plan will be implemented Correct answer.
  2. The NOI replaces the SWPPP for small sites
  3. The NOI is only required when the site exceeds 50 acres
  4. The SWPPP is submitted to the permitting authority before the NOI is prepared

Explanation

The NOI is the operator's application for coverage and certifies that a SWPPP has been or will be prepared and implemented. The SWPPP itself is retained on site or made available rather than submitted with the NOI in most general permit programs.

Question 39Construction stormwater program

A discharge from a construction site is found to cause an exceedance of a numeric turbidity limit in the receiving water. What is the operator's most appropriate response?

  1. Argue that turbidity is a natural condition and take no action
  2. Evaluate and upgrade controls, document the response, and notify as required by the permit Correct answer.
  3. Reduce the discharge volume by pumping to a different outfall
  4. Continue discharging and wait for the next scheduled monitoring event

Explanation

An exceedance triggers a duty to investigate the cause, implement additional or improved controls, and document the corrective action. Permit notification requirements may also apply depending on the severity and the permit's terms.

Question 40Construction stormwater program

Which factor is most relevant when deciding whether a site requires coverage under the EPA Construction General Permit rather than a state-specific permit?

  1. The type of construction contract used by the owner
  2. Whether the site is located in a state that has been authorized to administer the NPDES program Correct answer.
  3. The size of the storm drain pipe serving the site
  4. The number of employees working on the site

Explanation

NPDES permitting authority can be delegated to authorized states, which then issue their own construction permits. Where a state administers the program, the state permit governs rather than the EPA CGP.

Question 41Construction stormwater program

An inspector observes that a stockpile of excavated soil has no perimeter control and sits near a curb inlet. Which corrective action is most appropriate?

  1. Water the stockpile daily to keep dust down
  2. Leave the stockpile in place until final grading
  3. Move the stockpile onto the paved street for easier access
  4. Install perimeter controls and cover or stabilize the stockpile, and protect the inlet Correct answer.

Explanation

Stockpiles are pollutant sources that require perimeter controls, stabilization or covering, and protection of nearby inlets. Preventing sediment from reaching the storm drain is the objective of the corrective action.

Question 42Construction stormwater program

Which requirement applies to the timing of stabilization for a disturbed area that will not be worked for an extended period?

  1. Stabilization must be initiated immediately and completed within a short timeframe specified by the permit Correct answer.
  2. Stabilization may wait until project closeout
  3. Stabilization is required only on slopes steeper than 3:1
  4. Stabilization is optional if silt fence is installed downslope

Explanation

Permits set deadlines for initiating and completing stabilization once earth-disturbing activities have ceased on a portion of the site. The deadlines are short and apply regardless of slope steepness.

Question 43Construction stormwater program

An operator is considering a polymeric flocculant to improve sediment removal in a basin. Which precaution is most important?

  1. Using the flocculant only during dry weather
  2. Selecting a product and dose rate that will not cause toxicity in the receiving water Correct answer.
  3. Increasing the dose until the water becomes clear
  4. Applying the product without regard to the receiving water's sensitivity

Explanation

Cationic polymers and other flocculants can be toxic to aquatic life if residual concentrations reach the receiving water. Operators must select appropriate products, control dosing, and monitor to avoid causing or contributing to a water quality violation.

Question 44Construction stormwater program

A site has a single outfall where all stormwater leaves the property. Which monitoring approach best matches typical permit requirements?

  1. Collecting a sample at the outfall during a qualifying discharge event Correct answer.
  2. Sampling the receiving water upstream of the site only
  3. Collecting samples from the sediment basin bottom
  4. Sampling every stormwater conveyance on site

Explanation

Permit monitoring is generally conducted at the point of discharge, so samples are collected at the outfall during a qualifying event. Sampling locations and methods must follow the permit's monitoring requirements.

Question 45Construction stormwater program

Which element of a SWPPP identifies the individuals responsible for implementing and maintaining stormwater controls?

  1. The estimates of pollutant reductions section
  2. The endangered species certification section
  3. The pollution prevention team section Correct answer.
  4. The site description section

Explanation

The pollution prevention team section names the persons responsible for developing, implementing, and maintaining the SWPPP and its controls. Clear assignment of responsibility supports consistent implementation.

Question 46Construction stormwater program

An operator is evaluating whether to discharge accumulated sediment basin water to a stream during dry weather. Which consideration is most important?

  1. Whether the water is clear enough to avoid visible turbidity
  2. Whether the discharge is authorized and whether it meets applicable water quality standards Correct answer.
  3. Whether the basin has been cleaned within the past year
  4. Whether the stream flow is high enough to dilute the discharge

Explanation

Any discharge must be authorized by the permit and must not cause or contribute to a violation of water quality standards. Visual clarity alone does not establish that the discharge is lawful or protective.

Question 47Construction stormwater program

Which practice best ensures that a vegetative buffer along a site perimeter continues to function as intended?

  1. Periodically inspecting the buffer and repairing eroded or bare areas Correct answer.
  2. Removing the buffer to expand the graded area
  3. Routing concentrated runoff directly through the buffer
  4. Mowing the buffer to bare soil to improve visibility

Explanation

Vegetated buffers function only when vegetation is intact and flow is diffuse. Regular inspection and repair of bare or eroded areas maintains the buffer's capacity to filter and slow runoff.

Question 48Construction stormwater program

A site's SWPPP specifies a silt fence along a contour downslope of disturbed area, but the fence has been installed in a straight line that crosses a swale. What is the primary concern?

  1. The fence will be too tall to install properly
  2. The fence will not be visible to inspectors
  3. The fence will block vehicle access to the site
  4. Concentrated flow in the swale may overtop or bypass the fence Correct answer.

Explanation

Silt fence must be placed so that runoff ponds and infiltrates rather than concentrating and flowing around or over the fabric. Crossing a swale in a straight line creates a pathway for concentrated flow to defeat the control.

Question 49Construction stormwater program

Which statement best describes the operator's responsibility when a subcontractor causes an unauthorized discharge?

  1. Responsibility transfers to the property owner
  2. Responsibility rests solely with the subcontractor
  3. The permitting authority assumes responsibility for cleanup
  4. The operator remains responsible for compliance and must correct the discharge Correct answer.

Explanation

The permit holder is responsible for compliance with permit conditions regardless of which contractor performed the work. The operator must stop the discharge, implement corrective actions, and document the event.

Question 50Construction stormwater program

A project disturbs 4 acres and the operator intends to use a single sediment basin for the entire site. What design feature most directly protects the basin's treatment capacity over time?

  1. A diversion that routes all site runoff around the basin
  2. A permit that authorizes discharge without treatment
  3. An outlet designed to pass the largest storm without detention
  4. A maintenance plan that includes sediment removal when the design capacity is reduced Correct answer.

Explanation

Accumulated sediment reduces available storage and eventually impairs treatment. A maintenance plan that triggers cleanout when capacity is lost preserves the basin's designed performance.