How many feet SHALL be tested for exfiltration, infiltration, and alignment before any more of the sewer is constructed?

How many feet SHALL be tested for exfiltration, infiltration, and alignment before any more of the sewer is constructed?

• A. The First 1000 Feet
• B. The First 900 Feet
• C. The First 1500 Feet
• D. The First 1200 Feet

Answer: (D)

In sewer construction, you test a defined length of pipe for exfiltration, infiltration, and alignment before continuing. This step catches leaks or misalignment early, so you don’t propagate problems as the system grows. Testing the first portion provides a reliable sample of installation conditions—joint quality, bedding, and grading—and confirms that the line meets expectations before more sections are added.

The specified length is the first 1200 feet. This length strikes a balance: it’s long enough to reveal issues that could affect a substantial run of pipe, yet not so long that discovering a defect forces a large rework or slowdowns after many feet have been laid. If the segment tested were much shorter, small or localized problems might go unnoticed; if much longer, one flaw could halt progress across a large portion of the project. Therefore, testing the first 1200 feet best supports early detection and orderly progression.