S.C. Code Regs. § § 61-43.100.110

Current through Register Vol. 48, No. 11, November 22, 2024

Section 61-43.100.110 - Spray Application System Requirements

A. Spray application of swine manure using irrigation equipment. This includes all methods of surface spray application, including, but not limited to, fixed gun application, traveling or mobile gun application, or center pivot application.

B. New X-large swine facilities are prohibited from utilizing spray application systems for manure application. Manure must be incorporated into the manure utilization fields using subsurface injection at a depth of not less than 6 inches.

C. Manure utilization area slopes shall not exceed ten percent (10%) unless approved by the Department. The Department may require that slopes be less than ten percent (10%) based on site conditions.

D. Swine manure distribution systems shall be designed so that the distribution pattern optimizes uniform application.

E. Hydraulic Application Rates.

1. Application rates shall normally be based on the agronomic rate for the crop to be grown at the manure utilization area. As determined by soil conditions, the hydraulic application rate may be reduced below the agronomic rate to ensure no surface ponding, runoff, or excessive nutrient migration to the groundwater occurs.

2. The hydraulic application rate may be limited based on constituent loading including any constituent required for monitoring under this regulation.

F. Swine manure and other swine by-products shall not be applied when the vertical separation between the ground surface and the seasonal high water table is less than 1.5 feet at the time of application, unless approved by the Department on a case-by-case basis. For special cases, no land application can occur when the vertical separation from the ground surface to the water table is less than 1.5 feet at the time of application unless a situation is deemed an emergency with Departmental concurrence.

G. Conservation measures, such as terracing, strip cropping, etc., may be required in specific areas determined by the Department as necessary to prevent potential surface runoff from entering or leaving the manure utilization areas. The Department may consider alternate methods of runoff controls that may be proposed by the applicant, such as berms.

H. For swine facilities, a system for monitoring the quality of groundwater may also be required for the proposed manure utilization areas. The location of all the monitoring wells shall be approved by the Department. The number of wells, constituents to be monitored, and the frequency of monitoring shall be determined on a case-by-case basis based upon the site conditions such as type of soils, depth of water table, aquifer vulnerability, proximity to State Approved Source Water Protection Area, etc.

I. If an adverse trend in groundwater quality is identified, further assessment and/or corrective action may be required. This may include an alteration to the permitted application rate or a cessation of manure application in the impacted area.

J. Spray application systems shall be designed and operated in such a manner to prevent drift of liquid manure onto adjacent property.

S.C. Code Regs. § 61-43.100.110

Replaced and amended by State Register Volume 45, Issue No. 05, eff. 5/28/2021.