Blog

How many Septic Tanks are located along Lime Avenue? 

In the Lift Station Site Plan, how thick (in inches) is the expansion joint in the reduced pressure backflow preventer?

What is the (estimated) vertical decrease for the 8″ PVC pipe in section C2 from the inlet elevation of MH 4 to the inlet elevation of MH 6?

What thickness of granular backfill is required around manholes? 

Where can you find the details for the air/vacuum valve assembly? 

What is the station for Manhole 11? How far off the centerline is it (Left or right)? 

If someone were to fall down Manhole 22D, how far (in feet) would they fall?

How many pipes are connected to Manhole 22? 

What is the formula for the relative risk (no words a, b, c, d (lower case)) based on 2×2 table or incidence (Ie & Io), but no words at all. Since this is a formula, use the + and -, along with  “*” as multiplier and / as division as needed –  make sure to use proper parentheses. 

Find the value of k so that the given equation is exact. Then, find the general solution.