After clearing the mainline sewer inside the store, we performed a camera inspection and found that the cast iron pipe that travels beneath the floor of the store, has a heavy build up of sludge and scale. This restricts the size of the drain pipe and creates a rough surface that paper and feces can get stuck on, clogging the line. The only way to address this is to perform hydrojetting of the line from an accessible ground cleanout on the exterior of the building. We were unable to locate the exterior cleanout due to it being buried underground. The below proposal outlines the work to locate and excavate the cleanout as well as perform the maintenance on the mainline sewer. Opened mainline where sewer exited the building and installed two Way cleanout. Mainline was 6”. Performed hydrojetting and descaling