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SEPTIC SYSTEM INSPECT DIAGNOSE REPAIR
SEPTIC CARE INSTRUCTIONS
SEPTIC D-BOX INSTALL REPAIR
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
Sewer or septic line replacement: placing the new pipe in the trench. This article describes how the new sewer line is installed when a sewer pipe or "drain line" is replaced. We present an actual case study, illustrated with photos of each step in the diagnosis and replacement of a blocked sewer line. Also see Backups and Clogged Drains diagnosing septic backups and septic system failures versus clogged drains.
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Sewer Line Trench Details: uniformity, soil compaction
If you don't want sagging or broken sewer line pipes, clogs, and failures in the piping, then the sewer line trench bottom should be properly and uniformly sloped and compacted. The bottom of the sewer line trench should be virgin soil - not over-excavated. But since excavating is a rough art, some trench sections may be uneven and deeper than others. In that case the soil used for fill beneath the sewer piping must be adequately compacted to avoid future sags.
If you place the sewer piping in soft fill or areas where the fill compaction varies, the risk is that the piping develops low spots, sags, even breaks, leading to future clogging. And if trenches are not below the frost line, wastewater sitting in a low pipe sag in freezing climates may freeze, totally blocking the system.
The Alaska Septic Installation Manual suggests that sewer line trenches should be as narrow as possible in width and that piping should be laid on undisturbed soil or on compacted backfill soil. 
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