LARE SECTION 4 UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS

LARE SECTION 4 UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS

Question:
1. Time of Concentration
Answer:
Time it takes runoff to travel from the most remote point (longest time to drain from) to the end.

Question:
2. Factors of Surface Runoff
Answer:
Precipitation, soil type, slope, vegetation (all ground cover material).

Question:
3. What are the cons of a high water table?
Answer:
Prevent drainage/infiltration, no septic systems, complicated excavation, waterproofing structures.

Question:
4. What are variables of a floodplain?
Answer:
Topography, soils, vegetation, extent of past floods.

Question:
5. How do you mitigate flood hazards?
Answer:
Expand infiltration, minimize impervious surfaces, decrease runoff, no development on floodplain, green
infrastructure.

Question:
6. Permeability
Answer:
How water moves through soil.

Question:
7. Infiltration Rate
Answer:
Rate at which water enters the soil.

Question:
8. Steps of Soil Testing

,Answer:
Step 1: Identify Soil Type / Quality (disturbed, contaminated, etc)
Step 2: Soils to be classified relative to health.
Step 3: Identify Abnormalities
Step4: Determine where samples should be taken

Question:
9. What are best practices for Sampling Soil?
Answer:
Choose areas with different soil types (do not combine from different areas)
Closer attention to areas that will be planted
More tests = more accuracy
Mark location of tests on site, A1, A2, etc

Question:
10. What are expansive soils? What risk do they pose?
Answer:
Soils that shrink or swell do to water. This can cause instability in infrastructure.

Question:
11. Groundheave
Answer:
Soils swell upward due to moisture.

Question:
12. Liquefaction
Answer:
Soil acts like liquid when shaken. Loose sandy soils most risk.

Question:
13. Differential Subsidence
Answer:
Two soils under one building, uneven settlement.

Question:
14. Erosion Control
Answer:
Reduce or eliminate conditions lead to erosion.

Question:
15. Sediment Control
Answer:
Minimize off-site transportation of sediment when erosion occurs.

Question:
16. Causes of Erosion

, Answer:
Soil characteristics, vegetative cover, topography, precipitation.

Question:
17. What soils are most likely to erode?
Answer:
Silt most likely, clay less likely, sand least likely.

Question:
18. What are Erosion and Sediment Control Principles?
Answer:
Minimize disturbance, control runoff, collecting sediment, construction sequencing and monitoring.

Question:
19. How do you mitigate erosion from runoff on a construction site?
Answer:
Do not allow it to cross exposed / disturbed soil. Use vegetative buffer strips to reduce velocity. All runoff
should be directed to sediment control.

Question:
20. What is construction sequencing for erosion control?
Answer:
Control plans outlining monitoring, timing, and order of constriction. Ex: Install silt fence prior to
excavation.

Question:
21. Best Practices for Erosion Control
Answer:
Limit disturbance Avoid rainy season excavation Grade one area at a time Non-point pollution away from
areas drain into water Stabilize soil stockpiles Divert runoff from areas being graded Line drainage with
rip rap Add Check dams in channels.

Question:
22. Benefits of erosion control matting / blankets?
Answer:
Slow down runoff and helps seeds germinate.