What information is essential in a septic system design plan?

The essential information in a septic system design plan includes aspects such as soil type, lot size, water usage, and local regulations. Understanding the soil type is crucial because it affects how well the septic system will perform and how the wastewater will be treated. Different soils have varying absorption and percolation rates, which directly influence the size and placement of the drain field.

Lot size is also significant because it determines the space available for the septic system and ensures that it meets local regulations regarding setbacks from property lines, water sources, and structures. Water usage is important to gauge the expected demand on the septic system, allowing for accurate sizing and design to prevent system overload.

Local regulations are critical as they specify the requirements for septic system design and installation, helping to ensure public health and environmental protection. These factors combined provide a complete picture necessary for the effective and lawful installation of a septic system, making option A the correct choice.

The other choices do not contribute relevant information for septic system design. Nearby restaurants and shops may indicate local amenities but have no bearing on the technical requirements of a septic system. Knowing the names of property owners nearby or the prices of materials might be useful for other reasons, but they do not impact the technical and regulatory aspects of designing an effective