NR 204.07(4)(c)(c) Sludge that will be sold or given away in a bag shall, at a minimum, satisfy the class A pathogen requirements in sub. (6) (a), one of the vector attraction reduction process requirements in sub. (7) (a) to (i) and either the high quality pollutant concentration limits in Table 3 or the ceiling concentration limits in Table 1. Bagged sludge that does not meet the high quality limits in Table 3 is subject to the requirements in sub. (5) (d).

NR 204.07(5)(a)(a) Table 1 lists the ceiling concentrations of metal pollutants for sludge that is land applied. Sludge may not be applied to land if the concentration of pollutants in the sludge exceeds any of the ceiling concentration limits established in Table 1. Options available if a ceiling concentration in sludge is exceeded include: retesting, mixing with another sludge or other material and demonstration of compliance with Table 1, landfilling or incinerating.

NR 204.07(5)(b)(b) Table 2 lists the cumulative metal pollutant loading limits for sites on which bulk sludge is applied. If bulk sludge is applied to land and the sludge does not meet the pollutant concentration limits in Table 3, then the limits in Table 2 shall apply to all land application sites. Bulk sludge that does not meet the Table 3 concentration limits may not be applied to sites where the cumulative pollutant loading limits in Table 2 have been reached. When bulk sludge that does not meet Table 3 limits is applied to land, the permittee shall monitor and retain cumulative pollutant loadings records to each site, and shall notify the department, in their annual report, when any site reaches 90% of the allowable cumulative loading for any metal established in Table 2.

NR 204.07(5)(c)(c) Sludge shall meet all the pollutant concentration limits established in Table 3, to be considered high quality. High quality sludge is exempt from the cumulative loading limits specified in par. (b).

NR 204.07 NoteNote: The department strongly encourages permittees to produce sludge which meets the high quality pollutant concentration limits set in Table 3.

NR 204.07(5)(d)1.1. Table 4 lists the maximum annual pollutant loading rates for sites where bagged sludge that is not high quality is land applied. If bagged sludge does not meet all of the pollutant concentrations in Table 3, the pollutant loading requirements in Table 4 apply to all land application sites utilized, including lawns and home gardens. To ensure that the annual pollutant loading rates in Table 4 are not exceeded, the amount of sludge applied annually shall be less than the annual sludge application rate calculated as follows:

NR 204.07(5)(d)2.2. When distributing bagged sludge that is subject to the Table 4 loading rates, the permittee shall provide an information sheet to each person receiving the bagged sludge or shall print instructions on the bag or container or label. The label instructions or information sheet shall contain the following information, at a minimum:

NR 204.07(5)(d)2.c.c. An annual sludge application rate as calculated in this subsection that will ensure that the annual pollutant loading rate limits, established in Table 4, are not exceeded.

NR 204.07(6)(6) Pathogen densities and treatment processes. Sludge may not be land applied unless the Class A pathogen requirements in par. (a) or the Class B pathogen requirements in par. (b) are satisfied. These requirements are summarized in Tables 5 and 6. Bagged sludge and exceptional quality sludge shall satisfy the Class A requirements in par. (a).

NR 204.07(6)(a)(a) One of the requirements in each subds. 1. and 2. shall be met for sludge to be classified as Class A. Class A requirements shall be met prior to or at the time of meeting the vector attraction reduction requirements specified in sub. (7), unless the process used to meet the vector requirements is one of either sub. (7) (f), (g) or (h). Class A requirements are summarized in Table 5:

NR 204.07(6)(a)1.1. ‘Pathogen or indicator organism densities.’ The required fecal coliform density or salmonella density shall be satisfied immediately after the treatment process in subd. 2. is completed. If the material is bagged or distributed at that time, no re-testing is required. If the material is bagged, distributed or land applied at a later time, the sludge shall be retested and the requirements of subd. 1. a. or b. satisfied at that time also, to ensure that regrowth of the organisms has not occurred.

NR 204.07(6)(a)1.a.a. The sludge shall have a fecal coliform density equal to or less than 1,000 most probable number (MPN) per gram of total solids on a dry weight basis. Compliance with this requirement shall be demonstrated by calculating the geometric mean of at least 7 separate samples; or

NR 204.07(6)(a)2.a.a. Satisfy the requirements as specified in 40 CFR 503.32 (a). 40 CFR 503.32 (a) as stated on January 1, 1996 is incorporated by reference; or

NR 204.07 NoteNote: Copies of this section are available for inspection in the offices of the department of natural resources, secretary of state, and the legislative reference bureau, Madison, Wisconsin, or may be purchased from the superintendent of documents, U.S. government printing office, Washington DC 20402.

NR 204.07(6)(a)2.b.b. Compost the sludge using either within-vessel or static aerated pile composting methods and maintain the temperature of the sludge at 55° C or higher for 3 days, or compost the sludge using windrow composting methods and maintain the temperature of the sewage sludge at 55° C or higher for 15 days or longer. During this period, a minimum of 5 windrow turnings are required; or

NR 204.07(6)(a)2.c.c. Dry the sludge by direct or indirect contact with hot gases to reduce the moisture content of the sludge to 10% or lower. Either the temperature of the sewage sludge particles shall exceed 80° C or the wet bulb temperature of the gas in contact with the sludge as the sludge leaves the dryer shall exceed 80° C; or

NR 204.07(6)(a)2.e.e. Agitate liquid sludge with air or oxygen to maintain aerobic conditions. The mean cell residence time for the sludge shall be 10 days at 55° to 60° Celsius; or

NR 204.07(6)(a)2.g.g. Sludge is irradiated with gamma rays from certain isotopes, such as Cobalt 60 and Cesium 137, at dosages of at least 1.0 megarad at room temperature; or