2014-10-28_HYDROLOGY - M1998013 - Laserfiche WebLink

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October 28,2014 Mr. Eric Scott Division of Reclamation , Mines, and Safety 1313 Sherman Street, Room 215 Denver,Colorado 80203 RE: Shores Gravel Mine(Burch Amendment), Permit No. M-1998-013; Groundwater Mitigation Plan Dear Mr. Scott The purpose of this letter is to provide a groundwater mitigation plan for the Shores Gravel Mine and more specifically the proposed area to be added under this amendment. The Shores Gravel Mine is located one mile east of Interstate 25 and approximately one mile south of St.Vrain Creek along State Highway 119. Refer to Figure 1. Baseline Groundwater Evaluation A groundwater monitoring plan has been implemented and on February 14, 2014 two piezometers were installed in the southeast corner and another in the northwest corner of the property. Another three piezometers were installed on April 16,2014. These piezometers were continuously monitored on a monthly basis for 8 months and will be monitored throughout the mining process with water levels being reported twice a year or more frequently to the DRMS. Current groundwater levels were 10 feet below ground at the time of drilling in the southeast portion of the Site and 7 feet below ground in the northwest corner respectively. The groundwater gradient is generally from southwest to northeast. There are a few farm properties to the west,east and north of the Site. Table 1 below reports the wells within the area with some well data reported during the time of drilling and Figure 1 shows the actual well locations. Table 1 Well Well Pump Well Owner Permit Water Level Depth Type Rate (b s) (b s) ( pm) Rindour(well abandoned) 226509 2 28 Domestic 10 Aites 252974 18 Domestic 15 Vogl 103101 6 18 Domestic 15 Gillat 105608 34 Domestic 15 Andrews 201975 16 36 Domestic 15 Sewald 20441 12 30 Domestic 10 Bestway has continuously monitored the seasonal groundwater levels and determined a baseline water level after approximately 8 months of data has been recorded. Table 2 below reports the average,minimum and maximum water levels below ground for the monitoring wells.