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SEPTIC SYSTEM INSPECT DIAGNOSE REPAIR
SEPTIC CARE INSTRUCTIONS
SEPTIC D-BOX INSPECTION
SEPTIC DRAINFIELD FAILURE DIAGNOSIS
SEPTIC DYE TEST PROCEDURE
SEPTIC FAILURE SIGNS
SEPTIC INSPECTION & TEST GUIDE
SEPTIC LIFE EXPECTANCY
SEPTIC SUPPLIES & PARTS
SEPTIC SYSTEM DESIGN ALTERNATIVES
SEPTIC SYSTEM DESIGN BASICS
SEPTIC SYSTEMS, HOME BUYERS GUIDE to
SEPTIC SYSTEM SAFETY WARNINGS
SEPTIC TREATMENTS & CHEMICALS
SEWAGE BACKUP PREVENTION
SEWAGE EJECTOR / GRINDER PUMPS
SEWER GAS ODORS
SEWER LINE REPLACEMENT
SINKHOLES, WARNING SIGNS
SOAKAWAY BED FAILURE DIAGNOSIS
SULPHUR & SEWER GAS SMELL SOURCES
TOILETS, INSPECT, INSTALL, REPAIR
TRAPS on PLUMBING FIXTURES
TREATMENTS & CHEMICALS, SEPTIC
VIDEO GUIDES: Septic Videos
WATER CONSERVATION MEASURES
WATER SOFTENERS & CONDITIONERS
WATER SUPPLY & DRAIN PIPING
WATER, WELLS, WATER TANKS: TESTING GUIDE
WASHING MACHINES & SEPTIC SYSTEMS
WASTEWATER TREATMENT BASICS
WINTERIZE A BUILDING
This article describes the final backfill stage when a sewer pipe or "drain line" is replaced. The line which was replaced in this photo-illustrated case runs from the building exterior to a septic tank located downhill from the home.
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We present an actual case study, illustrated with photos of each step in the diagnosis and replacement of a blocked sewer line. Technical reviewers are welcome and are listed at "References."
This is a chapter of Inspecting, Testing, & Maintaining Residential Septic Systems an online book on septic systems. Also see Backups and Clogged Drains diagnosing septic backups and septic system failures versus clogged drains. Citation of this article by reference to this website and brief quotation for the sole purpose of review are permitted. Use of this information at other websites, in books or pamphlets for sale is reserved to the author.
After the drain pipe was fully bedded on and under sand, the excavator proceeded to backfill the remainder of the trench by pushing the excavated soil back in place. A skilled excavator can leave the site "rough graded" into a pretty smooth surface.
In this case a little work with an iron rake and some grass seed and the yard surface was back in acceptable condition. We bought a fast-growing fall-seeding grass seed so that grass would grow quickly so as to avoid erosion on the sloped rear yard, and we used some mulch to help hold the new seed in place until grass had sprouted.
The excavator took advantage of the backfill time to crush and bury piping scraps and debris from the excavated old sewer line. However we collected some of the larger debris, rubber and metal scraps, or other suspect items that had turned up during excavating (including a 1920's vintage automobile tire) to be hauled to a proper disposal site instead of permitting them to simply be buried on this residential property.
Final Site Grading after Sewer Line Replacement
The final grading over a sewer lineor any other septic piping system (such as drainfield trenches) should be left slightly mounded to accomodate the natural settlement of disturbed soils without leaving a trench or depression in the yard surface.
Final Site Cleanup after Sewer Line Replacement
We picked out plastic and other large debris items that the client did not want to discover later in the property's soil. Some of these materials, such as broken sections of abandoned used sewer piping may involve sharp edges or bacteriological hazards and should be disposed-of appropriately.
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