8.7.5.2. Loading Requirements

(1)

The effective area of the surface of the filter medium in each filter bed shall be at least 10 m2 and not more than 50 m2.

(2)

The area described in Sentence 8.7.4.2.(1) shall be designed such that the loading rate does not exceed, for soil having a percolation time set out in Column 1 of Table 8.7.4.1., the maximum value set out opposite it in Column 2 of Table 8.7.4.1.

(3)

Except as provided in Sentence (5), where the total daily design sanitary sewage flow does not exceed 3 000 L, the effective area shall be such that the loading on the surface of the filter medium does not exceed 75 L/m2 per day.

(4)

Except as provided in Sentence (5), where the total daily design sanitary sewage flow exceeds 3 000 L

(a)

the effective area shall be such that the loading on the surface of the filter medium does not exceed 50 L/m2 per day, and

(b)

the leaching bed shall be comprised of more than one filter bed, each of similar size and adjacent to each other.

(5)

Where a Level II, Level III or Level IV treatment unit as described in Table 8.6.2.2. is used in conjunction with a filter bed, the effective area shall be such that the loading on the surface of the filter medium does not exceed 100 L/m2 per day.