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• -16- • VII. P1luvial \'allev Floors - Rules 2.06,5 and 4.24 (con't) ho fanning activities will be p'rysically affected b•- these surface impacts. The only land use tc•pe which cai11 be directly affected is rangeland. The conclusion is, therefore, that the surface disturbance related to the operation is limited in extent and will not directly affect am• farming activities on the alluvial valle•• floor. An area of irrigated cropland is located on the East Salt Creek alluvial valley floor appro:;imately '~ mile do~.mstrea^ of ?1cClane Canyon. Irrigation occurs through a series of diversion ditches carr~•ing the surface flo~,• to various parts of the field. The essential hydrologic functions for this portion of the alluvial floors are related to surface flow. Surface water and ground water qualit}• and quantity ;gill be monitored during the permit term as specified earlier in this document. The monitoring program is designed to identify am• effects which nay occur as z result of the minine operation. No adverse effects are anticipated and the Division staff expect the monitoring program to provide proof of this contention. Salt Creek ?fining Company has also agreed to secure annuzl production data from the farmer downstream of the operation. This production data is to be considered as secondary to the water monitoring program because fluctuations in annual production can also result frog factors c.hich are independent of the mining operation. Therefore, pursuant to Rule 2.06.P.(5)(i), the Divisicn finds that the proposer surface coal mining operations would not interrupt, discontinue, or preclude farming on an alluvial valley floor. Alluvial Valley Floor Findings with Regard to PSaterial Damage to 4iater Quality and Quantit}•- There 'will be no discharge cf water from the mine workings. i:e development waste or roof fall rock will be disposed of or stored on the bench or any part of the disturbed area. The only potential effect of the operation o; water quality is through the introduction c€ suspended solids into runoff from the disturbed area. Runoff generated from the disturbed surface of the mine trill be contained within a sedimentation. system. Undisturbed flow from upland areas will be diverted around the disturbance and trill be unaffected by the operation. The sediment s}'stem is de=_ioned to minimize the contribution of suspended solids to runoff from the disturber treas. [dater will flow through z s}stem of ditches and culverts into a sediment pond. The sediment pond i=_ designed to detain the runoff for a sufficient period to allow sediment to settle out prior to routing the flow bat}: into the natural drainage. Discharge from the pond must meet 1;PDE5 and I-iined Land Reclamation Division effluent standards. There will be no significant adverse effect on water qualit}~ resulting from this operation.