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INTRODUCTION <br />Cyprus orchard Valley Mining Corporation has two underground mines <br />located approximately two miles north of Paonia Colorado (Figure <br />1). The Orchard Valley Mine (East Mine) has not operated since it <br />was sealed in June, 1986 after a mine fire. At that time the areal <br />extent of the workings was 1,156 acres. The Orchard Valley West <br />Mine (West Mine) was opened in January, 1987. The aerial extent of <br />the west Mine was 288 acres at the end of 1991. The Coal being <br />mined at both mines is the "D" Seam of the Mesaverde Coal Member. <br />The main hydrologic monitoring was begun at the mines in 1983. This <br />• report presents the results of the 1991 monitoring program. This <br />report also includes the results of previous monitoring. <br />The report is divided into six parts: 1) Stevens Gulch, 2) Roatcap <br />Creek, 3) Terror Creek, 4) Coal Gulch, Smith Creek, and North Fork <br />Gunnison Alluvium, 5) Bedrock Wells and 6) Discharge Stations. The <br />monitoring locations are shown in Figure 2 and summarized in Table <br />1. The water quality monitoring includes field parameters (Table <br />2), water quality parameters (Table 3) and NPDES parameters (Table <br />4). Ponds were sampled for water quality only when a discharge or <br />outflow was occurring. Stagnant water in ponds was not sampled <br />since water quality results would show the effects of evaporation <br />and stock use and could not be used for mine impact assessment. <br /> The 1991 samples and most of the previous water quality samples <br /> were analysed by ACZ Laboratories, Inc. Steamboat Springs, <br />1 <br />