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HYDROLOGIC CHARACTERIZATION AND MONITORING PLAN 20 <br />upstream of the confluence with Dry Fork; and Lower Minnesota Creek, located downstream of <br />the confluence with Dry Fork. The Upper Minnesota Creek monitoring station (Plate 1) was <br />established by the United States Forest Service (USFS) in 1977 to collect baseline data for the <br />SOD mine panels area and to support the Minnesota Creek Augmentation Plan. The Upper <br />Minnesota Creek Flume site has a 48 -inch Parshall flume and a data logger. <br />The Lower Minnesota Creek station monitors the SOD mine panels area and the southwest mine <br />panels area (Plate 1). The USGS monitored the Lower Minnesota Creek station (USGS <br />09134000) from 1937 to 1947 and from 1985 to April 2, 2014, when the station was <br />decommissioned. In mid-April 2014, CDWR installed a new staff gage and strip chart stream <br />depth recorder at the same location. A continuous stream depth recorder was also installed by <br />HydroGeo at the same location in June 2014. <br />4.1.3.8 South Prong Creek <br />South Prong Creek is an ephemeral stream that is tributary to Upper Minnesota Creek. The north <br />fork of South Prong Creek drains the southern portion of the SOD mine plan area. The <br />monitoring station on South Prong Creek is located at the mouth of the drainage (Plate 1) and <br />does not have a flume or data logger. Preliminary flow and water quality data were collected <br />during a one-time sampling round of this site in 2005 (HydroGeo, 2006). Baseline monitoring is <br />scheduled to resume at least one year prior to when mining begins in the area, in order to monitor <br />potential mining -induced impacts. <br />4.2 Spring and Seep Monitoring Program <br />There are 27 springs and seeps in the MCC hydrologic monitoring program. The spring and seep <br />monitoring plan is divided into three general hydrologic categories for discussion purposes: <br />• Springs and seeps in the North Fork drainage basin issuing from the strata above the <br />F -coal seam; <br />• Springs and seeps in the North Fork drainage basin issuing from strata in or below the <br />F -coal seam; <br />• Springs and seeps in the Dry Fork drainage issuing from strata above the E -coal <br />seam. <br />The locations of the spring and seep monitoring stations are shown on Plate 1. The following <br />discussion of monitored springs is presented according to the general hydrologic categories <br />described above and from upstream to downstream relative to the mining area. A summary of <br />the spring and seep monitoring program details is presented in Table 8. <br />Revised 09/07- PR12; 08/16- TR139 HydroGeo, Inc <br />