If trench rock delivered to a site has fine material mixed in, what is the appropriate action?

Choosing to send the load back to the quarry and wash the rock before installation addresses the potential concerns about the quality and suitability of the material for the intended septic system. Trench rock must meet specific standards to ensure proper drainage and structural integrity. When fine material is mixed in with the rock, it can lead to reduced porosity and drainage issues within the septic system, which can cause system failure.

Returning the material is an effective way to ensure that only high-quality, clean rock is used, which meets regulatory standards. Washing the rock can also help remove undesirable fine materials that might negatively impact the functionality of the septic system. Both actions are prudent for maintaining the system's performance and preventing future complications.

Therefore, opting for both sending the material back and washing it emphasizes a comprehensive approach to ensuring that only appropriate materials are used in the installation of septic systems, ultimately promoting long-term effectiveness and compliance with regulations. This decision reflects a commitment to quality and best practices in septic system installation.