Module 1
Water from rainfall or snow melt that flows across land picking up pollutants, rather than soaking into the ground is called...
stormwater runoff
A bioretention facility has been installed without rip rap at the inlets. What common problems might this cause?
Scour and erosion might occur without rip rap to stabilize the soil.
When planting a tree, the installer should make sure that the tree collar or root flare is...
Level with the ground surface at the base
Which of the following are the most effective strategies for reducing risk of injury or property damage due to conflict with utilities? (Select 2)
a. Call 811 prior to any excavation for utility markings.
b. Be familiar with the site plans, and look for visual cues for utilities on the ground.
c. Be familiar with the site plans, and look for visual cues of utilities both overhead and on the ground.
d. Call all major utility providers and schedule a representative from each to come out and mark the site
a. Call 811 prior to any excavation for utility markings.
AND
c. Be familiar with the site plans, and look for visual cues of utilities both overhead and on the ground.
What is the proposed slope percentage, if the RUN=3 and RISE=1?
33%
Which statements correctly describe the difference between a watershed and a drainage area?
(Select 2)
a. A watershed is a generally larger scale area of land, and a drainage area is typically a smaller scale area of land.
b. A watershed is a generally smaller scale area of land, and a drainage area is typically a large scale regional basin.
c. In a watershed, all the water falling within the boundary flows to a common outlet point on a water body (stream, mouth of bay, etc.). In a drainage area, all the water falling within the boundary flows to a specific point of interest (catch basin, rain garden, stormwater outfall, etc.)
d. A watershed collects water for later use (irrigation, delayed release, etc.) and a drainage area collects water and allows it to soak into the ground.
a. A watershed is a generally larger scale area of land, and a drainage area is typically a smaller scale area of land.
AND
c. In a watershed, all the water falling within the boundary flows to a common outlet point on a water body (stream, mouth of bay, etc.). In a drainage area, all the water falling within the boundary flows to a specific point of interest (catch basin, rain garden, stormwater outfall, etc.)
Which of the following correctly describes the importance of differentiating between clean and washed AASHTO # 57 stone and bank run or crusher run when delivered in the field?
a. Clean and washed AASHTO # 57 is uniformly graded aggregate free of fines, which allows for proper storage of stormwater in the pore space between aggregates. Bank run or crusher run has fine particles, which would fill the pore spaces between aggregates and would not be able to store stormwater as designed.
b. To ensure materials companies are not overcharging. Bank run or crusher run is significantly less expensive, and therefore is better for green infrastructure than AASHTO # 57.
c. To be able to track and report back to managers which was installed as aggregate storage at the end of the day since these stones can be used for aggregate storage layers.
d. Bank and crusher run is just the common name for AASHTO # 57; there is no difference.
a. Clean and washed AASHTO # 57 is uniformly graded aggregate free of fines, which allows for proper storage of stormwater in the pore space between aggregates. Bank run or crusher run has fine particles, which would fill the pore spaces between aggregates and would not be able to store stormwater as designed.
Describe how the critical root zone for trees would typically be determined
By a certified arborist, but is typically 1 foot (or 12 inches) for every inch of trunk diameter measured at 4.5 feet above the ground.
Channelizing devices are installed around construction sites in the right way perform which of the following safety functions? (Select 2)
a. Reduce the risk of construction or maintenance workers being struck by private vehicles.
b. To mitigate the impact of toxic fumes from traffic and construction vehicles.
c. To reduce the risk of passing vehicles and pedestrians being struck by construction vehicles.
d. To mitigate noise exposure for the surrounding community.
a. Reduce the risk of construction or maintenance workers being struck by private vehicles.
AND
c. To reduce the risk of passing vehicles and pedestrians being struck by construction vehicles.
Which of the following statements correctly differentiates between a Cross-Section or "Section" and a Longitudinal Profile or "Profile"?
a. A section is a drawing that shows the structure, size, and configuration of various components. A profile is a narrative within the construction documents describing the components and their function.
b. A section is a detailed diagram describing the sequence of construction for green infrastructure, and the profile is the narrative version and supports the diagram by describing the sequence.
c. A section is a drawing cutting across a stormwater practice to reveal the configuration of various components. A profile is a drawing cutting the practice lengthwise, usually used to show the change in elevation along the length of a stream or stormwater practice.
d. A section is a bold line shown on the plan to delineate the geographic areas that represent separate phases of work. A profile is a narrative description that describes the sequence of construction within and between each section.
c. A section is a drawing cutting across a stormwater practice to reveal the configuration of various components. A profile is a drawing cutting the practice lengthwise, usually used to show the change in elevation along the length of a stream or stormwater practice.
What is the difference between common grey and green infrastructure systems?
Green infrastructure mimics natural water cycles to improve water quality and reduce runoff quantity, while grey infrastructure moves water quickly through piped systems with minimal treatment or volume reduction.
When arriving on site after a rain, it is discovered that a stream of topsoil has washed from uncovered piles onto the piles of AASHTO #57 aggregate. Will this cause a problem?
Yes, because AASHTO #57 aggregates function as storage, and smaller grained sediment can clog these pore space between aggregates reducing the storage space.
5. Trees provide several functions within green infrastructure facilities. Which of the following best describe how trees function and add value within green infrastructure facilities? (Select 2)
a. Interception of stormwater before it reaches the ground, absorption of stormwater and pollutants, and transpiration of water that has been absorbed through roots.
b. Perforation of pipes in the facilities over time to mimic natural hydrology
c. Stabilization of soil and provision of habitat for birds and other wildlife
d. Providing small pockets of storage for stormwater beneath the surface in the aggregate storage layer
a. Interception of stormwater before it reaches the ground, absorption of stormwater and pollutants, and transpiration of water that has been absorbed through roots.
AND
c. Stabilization of soil and provision of habitat for birds and other wildlife
Which of the following is an accurate statement?
a. OSHA regulations require the use of trench boxes and the diversion of water away from a 5 foot deep trench excavation in stable rock.
b. OSHA regulations require the shoring of trench walls with planks and hydraulic jacks for a 3 foot deep trench excavation.
c. When installing trench boxes, a lip should with orange tape or flagging should be installed protruding a minimum of 6 inches above the surface of the ground to signal the operators of heavy equipment when they have reached the edge of the excavation.
d. Material stockpiles and excavated material should be placed at least 2 feet from the edge of any trench. Additionally, heavy equipment should be kept away from the edges of trenches and excavations.
d. Material stockpiles and excavated material should be placed at least 2 feet from the edge of any trench. Additionally, heavy equipment should be kept away from the edges of trenches and excavations.
7. Which of the following are sources of sediment that must be managed throughout construction? (Select 2)
a. Stockpiles of geotextile and waterproofing membrane
b. Land within the limit of disturbance
c. Vehicles, equipment, and tires
d. Land within the CRZ
b. Land within the limit of disturbance
AND
c. Vehicles, equipment, and tires
Which two stormwater functions are accomplished by plants and trees?
Transpiration and Interception
Which material might be used to protect a building or basement from stormwater intrusion when adjacent to a green infrastructure facility?
Waterproofing membrane
When installing landscaping for a green infrastructure facility, what should installers consult to determine what species should be installed in specific locations?
The planting plan as species are identified with symbols or call outs which correspond to symbols or call-outs on the planting palette or planting schedule.
In order to maintain a safe environment, how far should the ladder extend past the top support?
Minimum of three feet
Installation of a permeable pavement and bioretention is nearing completion, with only landscaping and mulch installation remaining. Which is the best place to store a new product delivery on site?
a. On an area of permeable pavement that has cured and settled for at least 24 hours and is at the same elevation as other materials, such as sand and aggregate.
b. On the impervious parking lot, which hasn't been disturbed.
c. Outside of the limits of disturbance, on an adjacent property.
d. Adjacent to the curb within the gutter, protected by traffic control devices
b. On the impervious parking lot, which hasn't been disturbed.
Which statement(s) correctly describe the difference between combined and separate sewer systems?
(Select 2)
a. In separate sewer systems, grey infrastructure is used to manage stormwater. In combined sewer systems stormwater is managed through a combination of grey and green infrastructure.
b. In separate sewer systems, grey infrastructure can quickly convey untreated stormwater containing pollutants directly to surface waters.
c. In combined sewers, wet weather can cause the system to overflow resulting in sewage overflows to surface waters.
d. In separate sewer systems, pipes convey stormwater and wastewater to separate wastewater facilities for treatment.
b. In separate sewer systems, grey infrastructure can quickly convey untreated stormwater containing pollutants directly to surface waters.
AND
c. In combined sewers, wet weather can cause the system to overflow resulting in sewage overflows to surface waters.
Which of the following characteristics best describe characteristics of topsoil? (Select 3)
a. Particle Size and Gradation
b. Organic Matter Content
c. Cation exchange capacity (CEC)
d. Carbon Nitrogen (C:N) ratio
a. Particle Size and Gradation
b. Organic Matter Content
c. Cation exchange capacity (CEC)
When installing plants within a bioretention planter, a colleague suggests that a plant species shown on the planting plans on the side slope looks better in the middle of the facility, and the plant species proposed for the middle of the facility looks nicer as a border. Could making this change cause problems in how the facility functions? (Select 2)
a. No, changing the location of a plant species will only change aesthetics.
b. Yes, plants on the side slopes are less likely to get wet or be underwater during a storm event than plants in the middle and are chosen accordingly. If the switch is made, these species may not survive.
c. Yes, making this switch may impair infiltration into the bioretention media and result in erosion.
d. No, Designers rely on people in the field to ensure their designs look aesthetically pleasing, so a change to make an improvement is part of the expectations of the job.
b. Yes, plants on the side slopes are less likely to get wet or be underwater during a storm event than plants in the middle and are chosen accordingly. If the switch is made, these species may not survive.
AND
c. Yes, making this switch may impair infiltration into the bioretention media and result in erosion.
Which of the following is a cause of the type of injury that occurs most frequently at work sites?
a. Oil from construction equipment that has spilled on a smooth metal plate
b. A worker in a deep trench that is improperly stabilized
c. Exposed electrical wire in a work area
d. A racoon acting erratically trapped in a storm drain
a. Oil from construction equipment that has spilled on a smooth metal plate
When arriving on site, the crew determines that the metal hub layout marking has been damaged, is protruding from the ground, and may have shifted from its original location. Which of the following risks might result from this issue?
a. The existing soils on the site could be mischaracterized, resulting in lack of infiltration into the subgrade.
b. This could result in problems during the site stake-out, where geographic location and proposed topography of features could be unreliable.
c. This indicates a historically significant area, and crews should expect unknown utilities and historic artefacts.
d. Crews should be careful when excavating, as these typically indicate the presence of communications cables for security agencies.
b. This could result in problems during the site stake-out, where geographic location and proposed topography of features could be unreliable.