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That's all I could find. I don't see why you need an engineer's letter, how big is the pipe and where in the footing are you trying to pass through the foundation? New sewer line?
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'78 SC Wide Body, '81 Engine. M&K 1in2 Out, Carrera Sways, ER F&R rear monoballs, ER control arm bearings, ER spring plate bearings, turbo tie-rods, ER strut brace, Tarret Drop links, Bilstein custom-valved shox, Rebel Racing bump-steer kit, 22mm F, 28mm R TBs. Rebuilt calipers, new wheel bearings.
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