Flowers and shrubbery Total amount │ │ │ │ _Concrete Work_ │ │ Manholes on pipe lines at each │ │ Settling tank, bottom, sides and at per cu.yd. │ │ roof │ │ Dosing tank, in addition to at per cu. yd. │ │ settling tank │ │ Manholes on sub-surface lines at per cu. yd. │ │ Concrete in contact beds or at per cu. yd. │ │ filters │ │ Concrete in protection wall at end at per cu. yd. │ │ of outfall │ │ │ │ _Pipe Lines_ │ │ │ │ 5– or 6–inch tile pipe (laid), at per lin. ft. │ │ house to disposal plant │ │ 6–inch pipe used in disposal at per lin. ft. │ │ plant, laid │ │ 6–inch pipe from plant to outfall at per lin. ft. │ │ 6–inch pipe for sludge line at per lin. ft. │ │ 6–inch pipe for main underdrain at per lin. ft. │ │ 3–inch agricultural tile in at per lin. ft. │ │ sub-surface disposal │ │ 4–inch agricultural tile in at per lin. ft. │ │ underdrains │ │ 6–inch specials, bends, tees, at each │ │ etc., in addition to cost of │ │ straight pipe │ │ 3–inch specials, bends, tees, at each │ │ etc., in addition to cost of │ │ straight pipe │ │ Cast-iron pipe at per lb. │ │ Cast-iron specials, bends, etc. at per lb. │ │ Wooden troughs for surface at per 1000 ft. B.M.│ │ distribution, in place │ │ │ │ _Filter Material_ │ │ │ │ Gravel filling around sub-surface at per cu. yd. │ │ tile, placed │ │ Sand filling for artificial filter at per cu. yd. │ │ beds │ │