Evaluation of Septic Tank and Subsurface Wetland for

pH
The results for the pH tests are presented in Table 5-10. Average pH of the influent to
the Pisgah septic system was determined to be 7.3 and influent to the Retrieve septic
system was determined to be 7.2. The pH of the effluent of both systems was consistent
and slightly basic at pH of 7.5 for Pisgah and 7.7 for Retrieve which is well within the
Jamaican national effluent standards for pH of 6 – 9.
Table 5-10 pH of Water Samples at Pisgah and Retrieve Sanitation Systems
________________________________________________________________________
Sample Arithmetic Mean 90% Confidence Sample
( X ) mg/l Interval mg/l Size (n)
Pisgah First Septic Tank 7.3 X ± 0.4
5
Pisgah Wetland Influent 7.4 X ± 0.5
5
Pisgah Wetland Effluent 7.7 X ± 0.1
4
Retrieve First Septic Tank 7.2 X ± 0.3
6
Retrieve Wetland Influent 7.2 X ± 0.3
6
Retrieve Wetland Effluent 7.5 X ± 0.1
7
51