25 Pa. Code § 73.16 - Absorption and spray field area requirements
TABLE A
Minimum Aggregate Absorption Area Requirements for Treatment Tank Effluent:
Square Feet of Aggregate Area Per Gallon Per Day | ||
Average Percolation Rate Expressed as Minute Per Inch | All Systems Except Elevated Sand Mounds and Subsurface Sand Filters | Subsurface Sand Filters and Elevated Sand Mounds |
Less than 3.0D | Unsuitable | Unsuitable |
3 - 5C | Unsuitable | 1.50AB |
6 - 15C | 1.19B | 1.50AB |
16 - 30C | (Avg. Perc Rate - 15) x (0.040) + 1.19B | 1.50AB |
31 - 45C | (Avg. Perc Rate - 30) x (0.030) + 1.79B | (Avg. Perc Rate - 30) x (0.026) + 1.50AB |
46 - 60C | (Avg. Perc Rate - 45) x (0.028) + 2.24B | (Avg. Perc Rate - 45) x (0.022) + 1.89A |
61 - 90C | (Avg. Perc Rate - 60) x (0.023) + 2.66A | (Avg. Perc Rate - 60) x (0.020 ) + 2.22A |
91 - 120ACD | Unsuitable | (Avg. Perc Rate - 90) x (0.017 ) + 2.82A |
121 - 150CD | Unsuitable | ((Avg. Perc Rate - 120) x (0.015 ) + 3.33) (1.05)A |
151 - 180CD | Unsuitable | ((Avg. Perc Rate - 150) x (0.014 ) + 3.78) (1.10)A |
Greater than 181CD | Unsuitable | Unsuitable |
A Pressure dosing required.
B One third reduction may be permitted for use of an aerobic tank.
C May be considered for experimental or alternate proposals.
D Unsuitable for subsurface sand filters.
TABLE B
Soil Characteristics | Slope | Required Spray Field Area (Ft 2) | ||
Depth To Rock | Depth To Water Table | 3 Bedroom Home | Additional Area Per Bedroom | |
16 to 20 inches | 10 to 40 inches | [GREATER THAN EQUAL TO]12% | 40,000 | 10,000 |
>12% | 80,000 | 20,000 | ||
>40 inches | [GREATER THAN EQUAL TO]12% | 15,000 | 3,750 | |
>12% | 30,000 | 7,500 | ||
>20 inches | 10 to 20 inches | [GREATER THAN EQUAL TO]12% | 20,000 | 5,000 |
>12% | 40,000 | 10,000 | ||
>20 inches | [GREATER THAN EQUAL TO]12% | 10,000 | 2,500 | |
>12% | 20,000 | 5,000 |
Notes
The provisions of this § 73.16 amended under section 9 of the Pennsylvania Sewage Facilities Act (35 P. S. § 750.9); The Clean Streams Law (35 P. S. §§ 691.1-691.1001); and section 1920-A of The Administrative Code of 1929 (71 P. S. § 510-20).
This section cited in 25 Pa. Code § 71.52 (relating to content requirements-new land development revisions); 25 Pa. Code § 71.63 (relating to retaining tanks); 25 Pa. Code § 72.22 (relating to permit issue); 25 Pa. Code § 73.14 (relating to site investigation); 25 Pa. Code § 73.15 (relating to percolation tests); 25 Pa. Code § 73.54 (relating to subsurface sand filters); 25 Pa. Code § 73.161 (relating to general); and 25 Pa. Code § 73.163 (relating to spray fields).
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