A) 770' 2" 771'8" 14 in. OD Lateral Main 749.15ft 3in Diameter 763.15ft Lowest Floor Elev.=763.75ft 147ft B) 763.15ft+1.16= 764.32 C) D) E) 3 in. sewer lateral 25 in frost depth 770.167'-2.083"=768.08 768.08-.25 f) Inv. Elev. -Crown Elev. Main + 1/2(OD) Distance building to Main 100% 763.15 -749.15 + 1/2(14) 147 100% 21 147 g) As stated in P3005.3 Horizontal drainage piping slope of “IRC CHAPTER 26 GENERAL PLUMBING REQUIREMENTS”:Horizontal drainage piping shall be installed in uniform alignment at uniform slopes not less than 1/4 unit vertical in 12 units horizontal (2-percent slope) for 2 1/2 inch (64 mm) diameter and less, and not less than 1/8 unit vertical in 12 units horizontal (1percent slope) for diameters of 3 inches (76 mm) or more. Therefore, any slope that is greater than 2 percent, with given pipe diameter of 3in, is adequate for drainage as determined by the sizeing chart (shown on the right) meaning that the calculated slope of ~14% is sufficient under code. Conclusion Questions) 1) A septic system would be appropriate when a residential space is unable to connect to a larger waste management system (like a rural house) 2) If possible, increasing the diameter of the pipe could be the first solution allowing the waste to flow better. However, otherwise increase the starting elevation of the branch would increase the slope helping to meet requirements 3) They help break down solid waste and other pollutants which prevent effective wastewater treatment 4) Effective wastewater treatment prevents the spread of diseases and pathogens in society and limits harmful effects on ecosystems 100% 0.142857142857 100% 14.2857142857%