Section 327 IAC 6.1-7-10 - Loading ratesAuthority: IC 13-14-8-7; IC 13-15-1-2; IC 13-15-2-1; IC 13-18-3-1; IC 13-18-12-4
Affected: IC 13-11-2-77; IC 13-30-2-1
Sec. 10.
(a) Maximum loading rates are determined for the pollutant-bearing water to be applied on the basis of the following parameters: (1) Hydraulic loads must not exceed the rates established in Table 11 as follows and a rate of two (2) inches per seven (7) day period: Table 11
| Maximum Application Rates Application Rate in Inches per Hour |
| Textural Class | Grass Sod | Cultivated |
| Sand | 1.5 | 0.8 |
| Loamy sand | 1.3 | 0.7 |
| Sandy loam | 0.9 | 0.5 |
| Fine sandy loam | 0.8 | 0.5 |
| Loam | 0.7 | 0.4 |
| Silt loam | 0.7 | 0.4 |
| Clay loam | 0.6 | 0.3 |
| Clay | 0.5 | 0.2 |
| Organic soils (muck) | 1.0 | 1.0 |
(2) Organic loading for industrial process wastewaters must not exceed the following:(A) One thousand four hundred (1,400) pounds per acre per week of total volatile solids as determined using Part 2540 G*.(B) Nine hundred thirty-three (933) pounds per acre per week of BOD as determined by a five (5) day BOD test.(C) The commissioner may approve a higher loading rate if the commissioner determines that adequate documentation has been presented to show effective operation at higher loading rates.(3) Available nitrogen loadings must not exceed either of the following: (A) The limits in Table 5 in 327 IAC 6.1-4-10(a)(1)(A) for crop production as determined using the methodology for calculating available and residual nitrogen values in subsection (b).(B) The nitrogen removal rate for the proposed crop to be grown on the land application site adjusted to account for application of fertilizers and manure and the presence of residual available nitrogen in the soil from previous applications of a biosolid, industrial waste product, or pollutant-bearing water.(4) Phosphorus loading requirements may be included as a permit condition if the commissioner determines it is necessary for protection of public health or the environment.(5) Annual heavy metal loadings must not exceed the limits in Table 4 in 327 IAC 6.1-4-9(d).(6) Cumulative heavy metal loading must not exceed the limits in Table 2 in 327 IAC 6.1-4-9(b).(b) The following formulas for PAN loading calculations apply to this article and must be used to calculate the amount of PAN in the pollutant-bearing water and the residual available nitrogen at the application site; all calculations are based on a wet weight basis in milligrams per liter:(1) Total N = Total Kjeldahl N + Nitrate N(2) Organic N = Total N - (Ammonia N + Nitrate N)(3) Pounds Organic N applied per acre = (Organic N) × (gallons applied) × (8.34) (3.33) × (1,000,000) × (acres applied to)
(4) Pounds of Ammonia N applied per acre = (Ammonia N) × (gallons applied) × (8.34) (1,000,000) × (acres applied to)
(5) Pounds of Nitrate N applied per acre = (Nitrate N) × (gallons applied) × (8.34) (1,000,000) × (acres applied to)
(6) Pounds PAN applied per acre = Pounds of Organic N applied per acre + Pounds of Ammonia N applied per acre + Pounds of Nitrate N applied per acre(7) Residual nitrogen from past biosolid or industrial waste products applications: (A) Pounds of residual N available per acre after one (1) year = (Organic N) × (gallons applied) × (8.34) (6.67) × (1,000,000) × (acres applied to)
(B) Pounds of residual N available per acre after two (2) years = (Organic N) × (gallons applied) × (8.34) (12.5) × (1,000,000) × (acres applied to)
(C) Pounds of residual N available per acre after three (3) years = (Organic N) × (gallons applied) × (8.34) (25) × (1,000,000) × (acres applied to)
Where: N = Nitrogen.
* Part 2540 G may be found in "Standard Methods for the Examination of Water and Wastewater", 18th Edition, 1992, available from American Public Health Association, 1015 15th Street, N.W., Washington, D.C. 20005. This method is also available for copying at the Indiana Department of Environmental Management, Office of Land Quality, 100 North Senate Avenue, Room N1154, Indianapolis, Indiana 46204.
Water Pollution Control Board Division; 327 IAC 6.1-7-10; filed May 15, 1998, 10:20 a.m.: 21 IR 3809; readopted filed Jan 10, 2001, 3:23 p.m.: 24 IR 1518; filed Jul 7, 2003, 4:25 p.m.: 26 IR 3626; errata filed Feb 6, 2006, 11:15 a.m.: 29 IR 1937; readopted filed Nov 21, 2007, 1:16 p.m.: 20071219-IR-327070553BFA; readopted filed Jul 29, 2013, 9:21 a.m.: 20130828-IR-327130176BFA; readopted filed Jun 14, 2019, 1:59 p.m.: 20190710-IR-327190246BFA