If there are excessive fissures (cracks) in the bedrock underlying the raised bed, what can you do?

• A. Recommend that the site may not be suitable for a leaching bed
• B. Drill additional wells
• C. Increase bed size
• D. Change to surface discharge

Answer: (A)

When the bedrock under a raised bed is heavily fissured, the leaching field cannot rely on the soil and gravel to evenly absorb and treat the wastewater. The cracks create unpredictable, rapid flow paths that can bypass the soil’s filtration and dispersion, increasing the risk of contaminating groundwater or nearby wells. Because the design assumptions for a leaching bed depend on a relatively stable, permeable soil layer above the rock, excessive fissuring undermines safety and effectiveness. So the most appropriate action is to acknowledge that the site may not be suitable for a leaching bed and look for an alternative site or a different, approved wastewater treatment approach. Increasing bed size, drilling wells, or switching to surface discharge does not address the fundamental problem and is not appropriate given the new risks and regulatory considerations.