CSLB C-46 Solar ContractorPlanning and EstimatingMedium
A C-46 contractor is performing a site analysis for a ground-mounted PV system on a property with varying soil conditions, including areas of loose sandy soil and compacted clay. To ensure the long-term stability and structural integrity of the array foundations, which of the following actions is most critical during the planning phase?
- AConducting a comprehensive geotechnical survey to inform foundation design.
- BSelecting larger PV modules to reduce the number of foundation points.
- CSpecifying a uniform foundation type across the entire array for simplicity.
- DIncreasing the array's tilt angle to minimize wind loading on foundations.
Show answer & explanationAnswer & explanation
Correct answer: A. Conducting a comprehensive geotechnical survey to inform foundation design.
A comprehensive geotechnical survey is crucial for understanding soil properties, which directly informs the appropriate foundation type and design (e.g., helical piles, concrete piers) needed for long-term stability on sites with varied soil conditions.
Why the other options are wrong
- B. Module size does not directly address foundation stability issues related to soil conditions.
- C. Using a uniform foundation type on varied soil can lead to instability in areas with unsuitable soil, compromising the entire array.
- D. Increasing tilt might increase wind loading, not minimize it, and doesn't address underlying soil stability issues.
Geotechnical Survey for PV
An investigation of subsurface soil and rock conditions to provide data necessary for the design of stable and appropriate foundations for ground-mounted PV systems.
- Assesses soil bearing capacity and stability.
- Identifies potential for frost heave or settlement.
- Crucial for foundation selection and design.
Memory trick: Know your ground before you build; soil secrets are key to a stable foundation.