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4.05.13 Surface and Groundwater Monitories <br />The current monitoring program is summarized by the following sites: <br />Sedimentation Ponds - Monitoring is in accordance with the requirements of <br />CDPS Discharge Permit CO-0045161. <br />Surface Water - Three surface water sites are monitored. <br />1 New IIpper Goodspring Creek (NUGSC) represents the upstream, <br />undisturbed or background condition. <br />2 Lower Goodspring Creak (LGSC) represents the downstream condition <br />found below mining activities. <br />3 Taylor Creek represents the downstream condition found below the <br />Gossard Loadout and mining activities. <br />Groundwater - Three groundwater sites are monitored. <br />1 A-6 Well - Located in the Goodspring creek alluvium, this site <br />represents the updip, undisturbed or background condition. <br />2 North Goodspring Well - Located in the Goodspring Creek Alluvium, this <br />site represents the downdip condition below mining activities. <br />3 Gossard Well - Located within the rail loop, this site represents the <br />condition of groundwaters associated with the Gossard Coal Loadout <br />Facility. <br />The evolution of the Surface and Groundwater Monitoring Plan is as follows: <br />^ In a letter to the Division dated May 2, 1983 Colowyo submitted <br />the surface and groundwater monitoring plan, which was <br />subsequently approved by the Division on May 6, 1983. A copy of <br />the letter is enclosed on pages 4.05-11 through 4.05-14 <br />^ Page 4.05-15 further explains changes to the Surface and <br />Groundwater Monitoring Plan. <br />^ Exhibit 18, Revisions for Second Five-Year Term, shows a Minor <br />Revision, "Modification of Groundwater Monitoring", approved <br />August 1989. <br />^ Exhibit 7, Hydrology Information, details the "Modification of <br />both Surface Water Monitoring and Alluvial Groundwater <br />Monitoring Locations, 1991". <br />^ Map 37, Water Monitoring Sites for Permit No. C-81-019 shows <br />updated well locations, surface water locations, and NPDES <br />discharge points. <br />^ Starting in early 1996 sampling procedures for groundwater wells <br />was changed from total recoverable metals to total dissolved <br />• metals. This sampling procedure modification will be noted in <br />future Annual Reclamation/Annual Hydrology Reports. <br />RBVisbn Submitled 3 - z~ -o ~ <br />--~. <br />4. 0 5 -10 RBViSiDn No• T~ - s l <br />