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• ctrn.i:B - F.~bst a Water Wormauoa Page 3 Stream Flow Data Because the drainages are all ephemeral and rarely flow, gaging stations have oat beat established on the project site. 100-Year Floodolain limits The 10(?-year floodplain of St. Vrain Cn~e]c does not extend o~ area. No other Berxuse of the lack of perennial streams in the project area, minimum stream flow standards are not • applicable. Surface Water Oualily 100-year floodplain has been identified on the property. Maps A, B, C and D w the 10(?-year flood plain of St. Vrain Creek in the vicinity of Dowe ~ 0~ Minimum Streamflow Standards -~'t'`p~ ? The surface water monitoring system inclalled for this project is comprised of three stations in the project area. An upgradient sampling station (DFSW-1) is locatied near the St. Vrain Supply Canal along the rrorthem edge of the property. 'Ittis station is situated in the meral stream drainage A,,,R flows southward toward St. Vrain Creek. 11te two additional stations (DFSW-2 and• DFSW-3) {'-.~'~~ n located along the southern perimeter of the project area. They az~' own tent m the ~ a ~` ephemeral drainage that flows through the property. Water quality monitoring was begun on June 8, ~ 1990 and has continued on a quartcely basis. A list of the patarrreters analyzed and the analytical ~~ method is summarized in Table G-1. The monitoring schedule to be implemented during the mine project is summarized in Table G-2. ~ ~~~+ >z~~-~ Historical Surface Water Quah~,y t Historical surface water quality data for St. Vrain Creek are available in U.S. Geological Survey Open File - sample locations discussed in the report are applicable to the proposed mine te. Station SVC-1 is orated upgradient of the proposed mine site on St. Vrain Creek near the • town o The results~of the water quality analysis from SVC-1 and SVC-2 are ~ ~ ~-