Sewer Line Replacement Procedure - final backfill InspectAPedia® -
Details of Final backfill over a new sewer pipe
Step by step main drain line replacement, house to septic tank (or sewer)
Questions & answers about backfill procedures & specifications when replacing a sewer or septic line or pipe
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.
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Guide to Details of Final backfill of the sewer line trench
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.
We picked out plastic and other large debris items that the client did not want to discover later in the property's soil.
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Thanks to Thomas Gleason, excavators, Poughkeepsie, NY 845-454-3730, for the excavating work at the project photo documented here in September 2006
Thanks to Cleveland Plumbing, the prime plumbing contractor, Staatsburgh, NY 845-485-7700 for the plumbing work and drain clog diagnosis work documented here in September 2006
Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair
Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore. Also see our Book Reviews - InspectAPedia.
Advanced Onsite Wastewater Systems Technologies, Anish R. Jantrania, Mark A. Gross. Anish Jantrania, Ph.D., P.E., M.B.A., is a Consulting Engineer, in Mechanicsville VA, 804-550-0389
(2006), Advanced Onsite Wastewater Systems Technologies.
Outstanding technical reference especially on alternative septic system design alternatives. Written for designers and engineers, this book is not at all easy going
for homeowners but is a text we recommend for professionals--DF.
AEROBIC SEPTIC SYSTEMS
Builder's Guide to Wells and Septic Systems, Woodson, R. Dodge: $ 24.95; MCGRAW HILL B; TP;
Quoting from Amazon's description: For the homebuilder, one mistake in estimating or installing wells and septic systems can cost thousands of dollars. This comprehensive guide filled with case studies can prevent that. Master plumber R. Dodge Woodson packs this reader-friendly guide with guidance and information, including details on new techniques and materials that can economize and expedite jobs and advice on how to avoid mistakes in both estimating and construction. Chapters cover virtually every aspect of wells and septic systems, including on-site evaluations; site limitations; bidding; soil studies, septic designs, and code-related issues; drilled and dug wells, gravel and pipe, chamber-type, and gravity septic systems; pump stations; common problems with well installation; and remedies for poor septic situations. Woodson also discusses ways to increase profits by avoiding cost overruns.
Country Plumbing: Living with a Septic System, Hartigan, Gerry: $ 9.95; ALAN C HOOD & TP;
Quoting an Amazon reviewer's comment, with which we agree--DF:This book is informative as far as it goes and might be most useful for someone with an older system. But it was written in the early 1980s. A lot has changed since then. In particular, the book doesn't cover any of the newer systems that are used more and more nowadays in some parts of the country -- sand mounds, aeration systems, lagoons, etc.
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