SPS 383.44(2)(a)(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: SPS 383.44(2)(b)(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. SPS 383.44(2)(c)(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. SPS 383.44 NoteNote: 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. SPS 383.44(2)(d)(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). SPS 383.44(3)(a)(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. SPS 383.44(3)(b)1.1. 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. SPS 383.44(3)(b)2.2. 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. SPS 383.44(3)(c)(c) The infiltrative surface of unsaturated soil to which influent is discharged shall be located at least one inch below the finished grade. SPS 383.44(4)(a)1.a.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. SPS 383.44(4)(a)1.b.b. Under subd. 1. a., the influent quality parameter with the highest concentration shall determine the maximum application rate. SPS 383.44(4)(a)1.c.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. SPS 383.44(4)(a)1.d.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. SPS 383.44(4)(a)1.e.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 ≤30 mg/L BOD5 and TSS and shall be 0.0 gals./sq. ft./day for effluent concentrations of > 30 mg/L BOD5 and TSS. SPS 383.44(4)(a)2.2. 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. SPS 383.44(4)(b)(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. SPS 383.44(4)(c)(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. SPS 383.44(5)(a)1.1. 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. SPS 383.44(5)(a)2.2. 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. SPS 383.44(5)(b)(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. 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
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.
SPS 383.44(6)(a)1.1. 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. SPS 383.44(6)(a)2.2. 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. SPS 383.44(6)(b)(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. SPS 383.44(6)(c)(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. SPS 383.44(7)(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. SPS 383.44 HistoryHistory: 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; 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. SPS 383.45(1)(1) General. A POWTS shall be constructed and installed in such a manner to hold wastewater or reduce the contaminant load and disperse the flow of wastewater in accordance with this subchapter and the plan approval under s. SPS 383.22. SPS 383.45(2)(2) Frozen soil. POWTS treatment and dispersal components consisting in part of in situ soil may not be installed if the soil is frozen at or below the infiltrative surface of the component. SPS 383.45(3)(3) Snow cover. Snow cover shall be removed before excavating or installing POWTS treatment and dispersal components consisting in part of in situ soil. SPS 383.45(4)(4) Moisture. The soil moisture content for a POWTS treatment or dispersal component consisting in part of in situ soil shall be evaluated immediately prior to installation of the component. If the soil at the infiltrative surface can be rolled into a ¼-inch wire, the installation may not proceed. SPS 383.45(5)(5) Bedding. All vessels and pipes of a POWTS shall be bedded in accordance with a product approval under s. SPS 384.10 or a plan approval under s. SPS 383.22. SPS 383.45(6)(a)(a) All POWTS treatment tanks, holding and dispersal tanks that are located in floodplain areas shall be made and maintained watertight to prevent infiltration. SPS 383.45(6)(b)(b) Vent pipes serving POWTS components that are located in floodplain areas shall terminate at least 2 feet above regional flood levels. SPS 383.45(7)(7) Minimum depth. The top of the effluent lines and forcemains shall be covered by a minimum of 12 inches of soil. SPS 383.45 HistoryHistory: Cr. Register, April, 2000, No. 532, eff. 7-1-00; CR 07-100: am. (6) Register September 2008 No. 633, eff. 10-1-08; correction in (1), (5) made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672; CR 17-065: am. (2), (6) (b), cr. (7) Register June 2018 No. 750, eff. 7-1-18. SPS 383.50SPS 383.50 Purpose. The purpose of this subchapter is to accomplish all of the following: SPS 383.50(1)(1) Establish monitoring, inspection, evaluation, maintenance and servicing requirements for all POWTS, in order to ensure that the POWTS will operate as designed and thereby protect the public health and waters of the state. SPS 383.50(2)(2) Establish maintenance programs operated by governmental units to ensure that all POWTS will be inspected, evaluated, maintained and serviced so that the POWTS will operate as designed and thereby protect the public health and waters of the state. SPS 383.50(3)(3) Provide the department with data by which to make regulatory decisions. SPS 383.50 HistoryHistory: Cr. Register, April, 2000, No. 532, eff. 7-1-00; CR 07-100: r. and recr. Register September 2008 No. 633, eff. 10-1-08. SPS 383.51(1)(1) A POWTS, including a POWTS existing prior to July 1, 2000, shall be maintained at all times so as not to create a human health hazard. SPS 383.51(2)(2) When upon inspection of a POWTS, including a POWTS existing prior to July 1, 2000, any part of the system that is found to be defective in conformance with the applicable provisions of this chapter, the installation or modification plan, or the approvals, the part shall be repaired, renovated, replaced or removed. SPS 383.51 NoteNote: Section SPS 387.04 (2) (a) to (e) also establishes management and maintenance requirements for a POWTS that is located in a governmental unit which participates in the replacement and rehabilitation program under s. 145.245, Stats.
