Is $40,000 to descale and epoxy coat mainline sewer pipe a fair price?

The initial scope was to replace the old cast iron sewer line and install double clean outs between the house and the city sewer. After excavation, the contractor decided against full replacement due to foundation concerns and proposed shooting a liner through the pipe instead. However, the contractor ultimately applied epoxy to the sewer pipe. - Work performed: Application of epoxy to the sewer pipe- Coverage: A layer of epoxy was applied only to the bottom (flow line) of the pipe- Coverage missing: No epoxy covering the top of the pipe- Contractor's claim: This partial lining is sufficient as long as the flow line has a new lining

Quote for epoxy lining to reinforce a water main pipe. - Length: 30 feet - Purpose: Reinforce pipe shifting due to roots

This quote is for the replacement of the main cast-iron drain line and associated connections. The work includes: - Replacement of the main cast-iron drain line - Replacement of connections for one toilet, one tub, one sink, and one kitchen sink - Reconnection of the side bathroom - Running a new line through the footing to replace all existing cast iron up to the clay connection in the front - All work is for cast iron located under the crawl space and is accessible - No work will be performed inside the walls - Total length of line replaced: 25 linear feet