DIY perc test ?

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A perc test is a engineered test/certified that is used for the design and installation of wastewater systems........It must carry an engineer's seal to be accepted by the local health/building dept.......for more read:

http://www.co.siskiyou.ca.us/phs/download/perctestmethod.pdf

http://www.extension.umn.edu/distribution/naturalresources/DD0583.html