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Section 785.19(d) Continued. Quality Data, are 478 mg/1 and 532 mg/1, respectively, for affected water. Since no expansion or other change is operations is pro- posed for the Kerr tipple, maximum concentrations of TDS are ex- pected to be within crop salt tolerance levels. The tipple facili- ty uses water from a non-tributary well for coal washing and duet control. This well is the only source of water for consumptive use at the tipple. Thus, operations at the Kerr tipple will not lower water levels in the surrounding marsh. Zn fact, discharge from the sedimentation pond at the tipple will supplement the water used for sub-irrigation in the surrounding area. Therefore, no material damage to the Illinois River floodplain is anticipated from opera- tions at the Kerr tipple facility. The second subject area, the Canadian River floodplain, is flood irrigated. The applicable criteria for determining material damage are potential TDS concentration as compared with crop salt toler- ance, potential surface water availability measured against irriga- tion requirements, and potential flooding as it impacts agri- cultural land use. From Table 10, Kerr Mine Area Surface Water Quality Data, the average and maximum TDS concentrations for af- fected water are 443 mg/1 and 1,180 mg/1, respectively. The TDS concentrations of affected water are expected to be within the salt tolerance levels for plants in the Canadian River floodplain. Although the 14 required sedimentation ponds will detain runoff from the mine plan area and some ephemeral tributaries to the Canadian River will be impounded, there will not be a corresponding reduction in water supply for irrigation, due to the fact that the ponds will fill during early spring before the annual irrigation season begins. Furthermore, as pointed out in Section 780.21, the total amount of water impounded in sedimentation ponds is small as compared with total irrigation usage on the Canadian River flood- . plain. Thus, the impoundment of surface water in required aedi- 785-39