What is the excavation length for a 2-foot wide excavation with a sewage flow of 100 gallons per day for Class 1b?

To determine the excavation length for a 2-foot wide excavation with a sewage flow of 100 gallons per day for Class 1b, it's essential to understand the specific requirements of this class regarding soil absorption and the corresponding calculations for wastewater treatment.

Class 1b typically refers to a category of soil for on-site sewage systems that has certain hydraulic loading rates. When calculating the required excavation length, the hydraulic loading rate for Class 1b is a crucial factor. Generally, for Class 1b soils, a standard hydraulic loading rate of about 0.75 gallons per square foot per day is used.

Given the flow of 100 gallons per day and the width of the excavation at 2 feet, the area required can be determined first. By taking the flow rate and dividing it by the hydraulic loading rate, we can find the necessary area:

1. First, calculate the area needed:

( \text{Area} = \frac{Flow}{Hydraulic Loading Rate} = \frac{100 , \text{gallons/day}}{0.75 , \text{gallons/sq. ft./day}} \approx 133.33 , \text{sq. ft.} )