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702.1 General
A pressure distribution system shall be permitted for use on any site meeting the conventional private sewage disposal system criteria. There shall be not less than 6 inches (152 mm) to the top of the distribution piping from original grade for any pressure distribution system. The minimum required suitable soil depths from original grade for pressure distribution systems shall be in accordance with Table 702.1.
SOIL REQUIRED
DISTRIBUTION PIPE
(inches)
SUITABLE SOIL
(inches)
149
250
352
453
For SI: 1 inch = 25.4 mm.
702.2 Absorption Area
The total absorption area required shall be computed from the estimated daily wastewater flow and the design loading rate based on the percolation rate for the site. The required absorption area equals wastewater flow divided by the design loading rate from Table 702.2. Two systems of equal size shall be required for systems receiving effluents exceeding 5,000 gallons (18 925 L). Each system shall have a minimum capacity of 75 percent of the area required for a single system and shall be provided with a suitable means of alternating waste applications. A dual system shall be considered as one system.
DESIGN LOADING RATE
PERCOLATION RATE
(minutes per inch)
DESIGN LOADING FACTOR
(gallons per square foot per day)
0 to less than 101.2
10 to less than 300.8
30 to less than 450.72
45 to 600.4
For SI: 1 minute per inch = 2.4 s/mm, 1 gallon per square foot = 0.025 L/m2.
702.3 Estimated Wastewater Flow
The estimated wastewater flow from a residence shall be 150 gallons (568 L) per bedroom per day. Wastewater flow rates for other occupancies in a 24-hour period shall be based on the values in Table 802.7.2.

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