I was hoping someone could help me understand the elevation measurements and abrieviations on a hand drawn plan from my town hall engineering dept. I am on septic and need to tie into the city sewer. I have seen plans like this before but never understood what these mean..... M.H.STA 18+21 or C.B. Rim EL. 251.79, or INV.EL. 240.63, or S=0.0064 or 8" A.C. CL 2400. Any help would be appreciated.
Another quick note. The elevations are from some reference benchmark location. It should say on the plan where the benchmark is and what its elevation is. This will give you everythng you need to know to use a level and a rod and do measurments to make your tie-in