Minnesota Administrative Rules
Pollution Control Agency
7080 - INDIVIDUAL SUBSURFACE SEWAGE TREATMENT SYSTEMS
7080.2350 - TYPE IV SYSTEMS.

Universal Citation: MN Rules 7080.2350
7080.2350 TYPE IV SYSTEMS.
Subpart 1. General.

A system designed according to this part is considered a Type IV system. The system must:

A. employ design flow values in parts 7080.1850 to 7080.1885;

B. meet or exceed applicable technical requirements of parts 7080.1900 to 7080.2030, 7080.2050, and 7080.2100;

C. meet or exceed the requirements of part 7080.2150, subpart 2;

D. meet the requirements of part 7080.2150, subpart 3, except as modified in this part;

E. meet the requirements of Table XI in subpart 2; and

F. meet soil dispersal requirements of parts 7080.2210, 7080.2220, and 7080.2230, except that the reductions in part 7080.2210, subpart 3, item B, are not applicable.

Subp. 2. Table XI.

TABLE XI

TREATMENT COMPONENT PERFORMANCE LEVELS AND METHOD OF DISTRIBUTION BY TEXTURE GROUP1

Vertical separation (inches) Texture group2
All sands and loamy sands Sandy loam, loam, silt loam Clay, clay loams
_
12 to 173 Treatment level A
Uniform distribution
Timed dosing
Treatment level A
Uniform distribution
Timed dosing
Treatment level A
Uniform distribution
Timed dosing
18 to 353 Treatment level B
Uniform distribution
Timed dosing
Treatment level B
Uniform distribution
Timed dosing
Treatment level B
Uniform distribution
36+3 Treatment level A-2
or B-2
Uniform distribution
Treatment level C
Treatment level A-2
or B-2
Uniform distribution
Treatment level C
Treatment level A-2
or B-2
Uniform distribution
Treatment level C

1 The treatment component performance levels correspond with those established for treatment components under the product testing requirements in Table III in part 7083.4030.

2 With less than 50 percent rock fragments.

3 Additional vertical separation distance is required as determined in part 7080.2150, subpart 3, item C, subitem (1), unit (b).

Subp. 3. Soil loading rates.

The absorption area and mound absorption ratio must be sized according to Table IX or IXa.

Statutory Authority:

MS s 115.03; 115.55

History:

32 SR 1347; 35 SR 1353

Published Electronically:

October 10, 2013

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