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During periods of temporary cessation, quarterly water quality sampling required <br />at SW-1 and SW-8. Twice a year water quality sampling at SW-2. Flow <br />measurement at SW-1, SW-2, and SW-8, when water sampling is conducted. <br />The water quality monitoring parameter list is outlined on Table 4.2-15. A <br />reduced parameter list (Short Suite For Temporary Cessation) is included in the <br />table. A notation on the table specifies that the short suite is to be implemented <br />only after mining has ceased for a period of at least 6 months. <br />E. Probable Hydrologic Consequences <br />A determination of the probable hydrologic consequences (PHC) of the mining and <br />reclamation activities at the McClane Canyon Mine site has been made by the applicant <br />and is found in Section 2.4.2.1 and Appendix N of the permit application. Annual PHC <br />updates are included in the annual hydrology report submitted each year by the operator. <br />The Probable Hydrologic Consequences section of this document is divided into two <br />main subsections: Ground Water Effects and Surface Water Effects. <br />Ground Water Effects <br />The occurrence of ground water within and adjacent to the permit area is controlled <br />primarily by the combination of local topography, stratigraphy and geologic structure. <br />Drilling has indicated that the Cameo coal seam becomes increasingly saturated downdip <br />(northeast) from its outcrop along the side slopes of the East Salt Creek Drainage basin. <br />This is depicted on Figure 4.2-3, of Volume II of the permit application. The saturated <br />zone extends downdip towards the northeast along anorthwest-southeast trending line. <br />The outcrop line of the coal, as well as the East Salt Creek drainage, run roughly north- <br />south in the vicinity of the permit area. Recharge to the Cameo coal seam occurs in an <br />area where the coal seam subcrops in the East Salt Creek alluvium approximately two <br />miles north of the McClane Canyon Mine permit area. Very little recharge of the coal <br />seams and sandstones occur along outcrops due to the low precipitation and steep slopes <br />which favor -unoff over infiltration. The underground workings extend roughly <br />eastward into the Cameo seam from a point where the coal seam outcrops in McClane <br />Canyon. <br />Drilling in the vicinity of the portals has indicated that saturated sandstone strata are <br />about 210 feet below the Cameo seam, and therefore, beyond any likely impact caused <br />by the mining activities. Associated roof and floor strata are not saturated in the area <br />of the mine. The mined zone is not a recharge area for these strata. The initial mine <br />workings were situated within a geologic structure identified as a graben. This graben <br />is bounded on both sides by faults. Future mining will be primarily to the east of the <br />graben in an area south of the existing mine entries. <br />19 <br />