Yes, increase the number of units by that same percentage.
Yes, you should increase the number of units by at least 13%.
For an event with 250 people ranging from 1 to 5 hour hours in length, rent 2 toilets. For events ranging 6 to 10 hours in length, rent 3 toilets.
According to the American National Standards Institute you determine the following rentals based upon based on 8 hour day/ 40 hour work week.
Consider installing risers over manhole covers to facilitate pumping. Build them yourself or contact a septic system contractor for pre-built type.
Yes, make a drawing of your septic tank location with measurements from fixed points to each manhole. Keep this information along with your household papers.
Check your tank by taking a long stick or board (T or 8’) and separate the scum matt layer. If it is 10-12” thick, pump your tank regardless of the sludge in the tank.
Another test, push the board down into the tank. When you feel slight resistance, you have reached the sludge layer. Make a mark on the board level with the top of the tank. Push the board down until you reach the bottom of the tank. Mark the board as before. If you have at least 18” of sludge in the bottom of your tank, or if the sludge is within 6” of the bottom of the outlet Tee (or baffle) then it should be pumped.
Check the second compartment (where the sewage goes out of the tank). This compartment should have less scum matt and sludge accumulation that the irst compartment. Of the accumulation is close to that in the first compartment, pump your tank more often. Pump both compartments when your tank is pumped.
Start at the end nearest the house (where the sewage comes into the tank). The brownish frothy looking matt is the scum layer. If the scum layer is level with the top of either tee (or baffle), or within 4” of the top tank, then your tank needs pumping.
Check with the County Health Department records or look under your house for 3” or 4” sewer line. Note where it passes into the soil and under the foundation. Dig down outside the foundation at the same location and follow the pipe to the tank or, noting the direction it goes, use a metal probe (such as rebar) and probe the ground until found. The septic tank should be within 10-20 feet of the house, but might be further away.