2013-12-12_REVISION - M1990057 - Laserfiche WebLink

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Mr. Michael Cunningham 3 CDRMS December 13, 2013 Response: UMC commits to using EPA Method 200.8 for testing surface and ground water. 3. The Applicant has indicated there are 9 domestic wells near the mill that are located outside of the unnamed tributary which drains the mill site. Figure 13 -1 shows there are two domestic wells immediately down gradient of the mill site. Please revise Exhibit U to include the addition of these two domestic wells. In addition, the applicant has stated that there are 11 wells (9 domestic and 2 industrial) near the mill. Please specify the approximate distance to these wells. Are they within 600 feet of the mill site? Response: The domestic wells shown in Figure 13 -1 have been included in Exhibit U. Of these, the northern most well (Mellott, DW02) is up gradient of the Mill and southern well (Wibbenmeyer, DW01) is down - gradient of the Mill. There are 2 wells within 600ft of the property, both are down- gradient of the mill. All wells (as reported by the State Engineer) within a ±0.5 mile radius of the mill site are shown in Attachment 2. The topography contours on this figure approximate the ground water gradient. UMC will replace the first 2 paragraphs of Section 14.9.1 to read as follows: As reported by the office of the State Engineer, there are 453 domestic wells within a 2 -mile radius of the Mill, as shown in Figure 14 -1. There are 11 wells located approximately 0.5 miles from the Mill; 8 are domestic, 2 are EPA monitoring wells and one is an industrial well. These wells are described in Table 14 -5 and are shown in Figure 14 -3 [see Attachment 2]. Table 14 -5: Wells Located Approximately 0.5 Mile Radius of Mill No. Hole ID Type 1/4, 1 /4,Section Owner Latitude Longitude Distance(ft) Location 1 DWO1 Domestic NW, NE, 33 Wibbenmeyer 39.2290775 - 106.3346511 450 Down Gradient 2 DW02 Domestic SW, SE, 28 Mellott 39.2326040 - 106.3363120 850 Up Gradient 3 DW03 Domestic NE, NE, 33 Stapleton 39.2281441 - 106.3311845 475 Down Gradient 4 DW04 Domestic SE, NE, 28 Haynes 39.2393530 - 106.3303940 3,100 Up Gradient 5 DW05 Domestic NE, SW, 28 Smith 39.2371320 - 106.3402510 2,970 Up Gradient 6 DW06 Domestic SW, SW, 28 Eaton 39.2318080 - 106.3451880 3,350 Up Gradient 7 DW07 Domestic NE, NW, 33 Flank Oil Co 39.2264430 - 106.3384462 1,850 Down Gradient 8 DW08 Domestic SE, NW, 33 Molleur 39.2236431 - 106.3402349 2,900 Down Gradient 9 EPA01 Monitoring NW, NW, 33 EPA 39.2281390 - 106.3265040 1,300 Up Gradient 10 EPA02 Monitoring NE, SW, 27 EPA 39.2353920 - 106.3265410 1,990 Up Gradient 11 Iw01 Industrial NE, SW, 27 Diedrich 39.2354140 - 106.3218730 2,925 1 Up Gradient 1 DW= Domestic Well, EPA= EPA Monitoring Well, IW= Industrial Well 2 Well type, owner, and coordinates, as reported by the Office of the State Engineer. 3 Approximate closest distance from mill site disturbance area. The closest down - gradient wells (DW01, and DW03) are less than 500ft from the Mill and are located on the North side of California Gulch, as is the Mill. DW01 is used by Wibbenmeyer for domestic purposes. The State Engineer reports Stapleton as owner of DW03. DW03 is on the property owned by Phillips and is planned for intermittent use by Phillips for commercial purposes. There are no houses or buildings on the Phillips property.