Question pretext
Ask to visit the drinking water source from which the drinking water was collected. Collect water directly from this source and test it for arsenic and E. coli as done with the household samples. Label these Compact Dry plates S-XXX-YY, where XXX is the EA number and YY is the household number.
Question post text
THE FOLLOWING INFORMATION WQ10 - WQ12 HAS TO BE RECORDED BY THE MEASURER AFTER 24-48 HOURS INCUBATION: