Section SPS 383.44 - Parameters for POWTS components consisting of in situ soil(1) EVALUATION. POWTS treatment and dispersal components consisting in part of in situ soil shall be evaluated in accordance with ch. SPS 385.(2) INFLUENT QUALITY. (a) The quality of influent discharged into a POWTS treatment or dispersal component consisting in part of in situ soil shall be equal to or less than all of the following: 1. A monthly average of 30 mg/L fats, oil and grease.2. A monthly average of 220 mg/L BOD 5.3. A monthly average of 150 mg/L TSS.(b) The monthly average under par. (a) shall be calculated as the sum of all measurements taken over 30 consecutive days, with at least 6 measurements occurring on 6 separate days, and divided by the number of measurements taken during that period. (c) Influent discharged to a POWTS treatment or dispersal component that consists in part of unsaturated soil may not contain any solid or suspended solid exceeding 1/8 inch in diameter. Note: Under s. SPS 383.03 (1) (b), the replacement of a POWTS anaerobic treatment tank (septic tank) in conjunction with this rule would limit any solids within the effluent leaving the tank to a maximum of 1/8-inch diameter.
(d) The department may designate a new facility as "at-risk" if the department determines that the facility may generate waste with influent quality in excess of the parameters under par. (a) . A facility designated as "at-risk" shall submit additional testing data as specified in par. (b) to the department and the governmental unit within one year of installation of the POWTS components. A facility that continues to produce influent with parameters above the limits in par. (a) or the approved design shall reduce wastewater strength according to the facility's management plan required under s. SPS 383.54 (1). (3) INFILTRATIVE SURFACE. (a) The infiltrative surface of unsaturated soil to which influent is discharged shall be located at least 24 inches above the estimated highest groundwater elevation and bedrock.(b)1. A POWTS designed utilizing a component manual recognized under s. SPS 383.60 (1) shall have at least 6 inches of the soil separation required under par. (a) consisting of an in situ soil type for which soil treatment capability has been credited under Table 383.44-3. 2. The purpose of the 6 inches of in situ soil under subd. 1. shall be to assure that the influent will be assimilated into the original subsurface soils without ponding on the ground surface. (c) The infiltrative surface of unsaturated soil to which influent is discharged shall be located at least one inch below the finished grade.(4) CAPABILITIES. (a)1.a. Except as provided under subd. 2., the dispersal capability of a POWTS treatment or dispersal component consisting in part of unsaturated soil shall be limited to that specified in Table 383.44-2 based upon the influent quality concentrations being applied.b. Under subd. 1. a., the influent quality parameter with the highest concentration shall determine the maximum application rate. c. Except as provided in par. (c), the soil conditions at the infiltrative surface of unsaturated soil to which influent is to be discharged shall be used to establish the maximum application rate for a POWTS dispersal design.d. The moist soil consistence of the soil horizon in which the infiltrative surface of a POWTS treatment or dispersal component will be located may not be stronger than firm or any cemented classification.e. The maximum soil application for soil with moderate to strong platy structure shall not exceed 0.2 gals./sq. ft./day for effluent concentrations of d30 mg/L BOD 5 and TSS and shall be 0.0 gals./sq. ft./day for effluent concentrations of 30 mg/L BOD 5 and TSS.2. Maximum soil application rates other than those specified in Table 383.44-2 may be employed for the design of a POWTS treatment or dispersal component consisting in part of in situ soil if documentation is submitted and approved under s. SPS 383.22 and is based on soil permeability and evapotranspiration estimates correlated to specific soil characteristics described in a detailed morphological soil evaluation.(b) The treatment capability of a POWTS treatment component consisting of unsaturated soil shall be limited to that specified in Table 383.44-3, unless otherwise approved by the department.(c) The design of a treatment or dispersal component consisting in part of in situ soil shall reflect restrictive soil horizons that affect treatment or dispersal.(5) EFFLUENT DISTRIBUTION. (a)1. Except as provided in subd. 2., the distribution of effluent to a treatment or dispersal component shall be by means of pressure distribution as specified in Tables 383.44-2 and 383.44-3.2. Pressure distribution is not required when rehabilitating an existing non-pressurized in situ soil treatment or dispersal component that is persistently ponded and that has at least 24 inches of unsaturated soil beneath the infiltrative surface of the component.(b) Each dose of effluent by means of pressurized distribution into a treatment or dispersal component consisting in part of in situ soil may not be less than 5 times the void volume of the POWTS distribution laterals. Soil Characteristics | Maximum Monthly Average |
Textured | Structure6 | BOD5 30 220mg/L TSS 30 150mg/L | BOD5 30 mg/Lc TSS 30 mg/Lc |
Shape | Grade |
COS, S, LCOS, LS | ---- | 0 | 0.7a | 0.5b,c | 1.6a | 0.5b |
FS, LFS | ---- | 0 | 0.5 | 1.0 |
VFS, LVFS | ---- | 0 | 0.4 | 0.6 |
COSL, SL | ---- | OM | 0.2 | 0.6 |
PL | 1 | 0.4 | 0.6 |
2,3 | 0.0 | 0.2 |
PR, BK, GR | 1 | 0.4 | 0.7 |
2,3 | 0.6 | 1.0 |
FSL, VFSL | ---- | OM | 0.2 | 0.5 |
PL | 2,3 | 0.0 | 0.2 |
PL, PR, BK, GR | 1 | 0.2 | 0.6 |
PR, BK, GR | 2,3 | 0.4 | 0.8 |
L | ---- | OM | 0.2 | 0.5 |
PL | 2,3 | 0.0 | 0.2 |
PL, PR, BK, GR | 1 | 0.4 | 0.6 |
PR, BK, GR | 2,3 | 0.6 | 0.8 |
SIL | ---- | OM | 0.0 | 0.2 |
PL | 2,3 | 0.0 | 0.2 |
PL, PR, BK, GR | 1 | 0.4C | 0.6 |
PR, BK, GR | 2,3 | 0.6 | 0.8 |
SI | ---- | ---- | 0.0 | 0.0 |
Soil Characteristics | Maximum Monthly Average |
Textured | Structure6 | BOD5 30 220mg/L TSS 30 150mg/L | BOD5 30 mg/Lc TSS 30 mg/Lc |
Shape | Grade |
SCL, CL, SICL | ---- | OM | 0.0 | 0.0 |
PL | 1,2,3 | 0.0 | 0.2 |
PR, BK, GR | 1 | 0.2 | 0.3 |
2,3 | 0.4 | 0.6 |
SC, C, SIC | ---- | OM | 0.0 | 0.0 |
PL | 1,2,3 | 0.0 | 0.0 |
PR, BK, GR | 1 | 0.0 | 0.0 |
2,3 | 0.2 | 0.3 |
Note a: With 60% rock fragments
Note b: With 60 to 90% rock fragments
Note c: Requires pressure distribution under sub. (5) (a)
Note d: | COS - Coarse Sand | LVFS - Loamy Very Fine Sand | SI - Silt |
S-Sand | COSL - Coarse Sandy Loam | SCL - Sandy Clay Loam |
LCOS - Loamy Coarse Sand | SL - Sandy Loam | CL - Clay Loam |
LS - Loamy Sand | FSL - Fine Sandy Loam | SICL - Silty Clay Loam |
FS - Fine Sand | VFSL - Very Fine Sandy Loam | SC - Sandy Clay |
LFS - Loamy Fine Sand | L - Loam | C - Clay |
VFS-Very Fine Sand | SIL - Silt Loam | SIC - Silty Clay |
Note e: | PL - Platy | 0 - Structureless |
PR - Prismatic | 1-Weak |
BK - Blocky | 2 - Moderate |
GR - Granular | 3 - Strong |
M - Massive |
Soil Characteristics | Influent Qualitye and Percent Coarse Fragments |
Textured | Fecal Coliform 104 cfu/lOOmL | Fecal Coliform 104 cfu/100mLb |
35% | 35to 60% | 60 to 90%b,c | 35% | 35to 60% | 60 to 90%c |
COS, S, LCOS, LS | 36 | 60 | 60 | 24 | 36 | 60 |
FS, VFS, LFS, LVFS | 36 | 24 |
COSL, SL | 36 | 24 |
FSL, VFSL | 36 | 24 |
L | 36 | 24 |
SIL | 36 | 24 |
SI | 36 | 24 |
SCL, CL, SICL | 36 | 24 |
SC, C, SIC | 36 | 24 |
Note a: Influent quality as per s. SPS 383.44 (2)
Note b: Requires pressure distribution under sub. (5) (a)
Note c: All coarse fragment voids must be filled with fine earth
Note d: | COS - Coarse Sand | LVFS - Loamy Very Fine Sand | SI - Silt |
S-Sand | COSL - Coarse Sandy Loam | SCL - Sandy Clay Loam |
LCOS - Loamy Coarse Sand | SL - Sandy Loam | CL - Clay Loam |
LS - Loamy Sand | FSL - Fine Sandy Loam | SICL - Silty Clay Loam |
FS - Fine Sand | VFSL - Very Fine Sandy Loam | SC - Sandy Clay |
LFS - Loamy Fine Sand | L - Loam | C - Clay |
VFS-Very Fine Sand | SIL - Silt Loam | SIC - Silty Clay |
Note e: The values for fecal coliform are reported as a monthly geometric mean. The geometric mean shall be determined on the basis of measurements taken over 30 consecutive days, with at least 6 measurements occurring on 6 separate days.
(6) ORIENTATION. (a)1. The infiltrative surface of a distribution cell within a POWTS treatment or dispersal component consisting in part of in situ soil and located in fill material above original grade shall be level.2. The longest dimension of a POWTS treatment or dispersal component located at or above the original grade shall be oriented within 1 percent of the surface contour unless otherwise approved by the department.(b) The infiltrative surface of a distribution cell within a POWTS treatment or dispersal component consisting in part of in situ soil and located below the surface of the original grade shall be level.(c) POWTS treatment or dispersal components consisting in part of in situ soil shall be so located as to minimize the infiltration of storm water into the component.(7) GEOMETRY. The geometry of a subsurface treatment or dispersal component consisting in part of the in situ soil shall take into account linear loading rates that are based on soil texture, structure, consistence and distance to seasonal soil saturation and restrictive soil horizons.Wis. Admin. Code Department of Safety and Professional Services SPS 383.44
Cr. Register, April, 2000, No. 532, eff. 7-1-00; CR 02-129: (3) (b) and (4) (c), r. and recr. (5) (a) and Tables 83.44 -2 and 83.44-3 Register January 2004 No. 577, eff. 2-1-04; CR 07-100: am. (3) (b) 1. and Tables 83.44 -2 and 3, r. (5) (b), renum. (5) (c) to be (5) (b) Register September 2008 No. 633, eff. 10-1-08; correction in (1), (3) (b) 1., (4) (a) 1. a., f., 2., (b), (5) (a) 1., Table 383.44-3 made under s. 13.92(4) (b) 7, Stats., Register December 2011 No. 672.Amended by, CR 17-065: cr. (2) (d), r. (4) (a) 1. f., Table 383.44-1, am. (6) (a) 2. Register June 2018 No. 750, eff. 7-1-18; correction in (4) (a) 1. a., 2. made under s. 13.92 (4) (b) 7, Stats., Register June 2018 No. 750, eff. 7/1/2018