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LA May 14, 2014 Mr. Eric Scott Division of Reclamation , Mines, and Safety 1313 Sherman Street, Room 215 Denver, Colorado 80203 A �� RE; Shores Gravel Mine (Bunch Amendment), Permit No. M -1998 -013• Preliminary Groundwater' , ry rou dwater Mitigation Plan Dear Mr. Scott The purpose of this letter is to provide a monitoring plan of various wells within the surrounding area to determine seasonal groundwater variation surrounding the Shores Gravel Mine and more specifically the proposed area to be added under this amendment. The Shores Pit 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. Groundwater Evaluation and Monkoriing Plan A proposed groundwater monitoring plan has been implemented and on February 14, 2014 two piezometers were installed in the southeast comer and another in the northwest comer of the property. Another three piezometers were installed on April 16, 2014, see attached well permits submitted to the Division of Water Resources. These piezometers will be continuously monitored on a monthly basis for the next year and through the mining process with water levels being reported twice a year or more frequently to the DBMS. Current groundwater levels were 12 feet below ground at the time of drilling in the southeast portion of the Site and 8 feet below ground in the northwest comer respectively. The groundwater gradient is approximately 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 2 shows the actual well locations. Table 1 This stretch of the alluvial aquifer contains various slurry lined mines. The Burch Site proposed slurry wall will be could cause mounding on the south and west and a possible shadow effect on the north and east Existing water levels from borings done in 2004 on the Shores Pit indicate that water is 8 feet to 11 feet below ground surface. The current observed water levels in the wells are shown in Table 2 below. BESTWAIC C O N C R z T E tit A G G R f G A T E P.O. Box 309 MILLIKEN, COLORADO 80543 -0309 970- 356-7523 Well Well pump Well Owner Permit Water Level Depth Type Rate - (bgs) (bes) (wm) Rindour (well abandoned) 226509 2 28 Domes8cc _ 10 Apes 252974 18 Domestic 15 Vogl 103101 6 18 Domestic 15 Gmat 105608 34 Domestic 15 Andrews 201975 16 36 Domestic 15 Sewald 20441 12 30 Domestic 10 This stretch of the alluvial aquifer contains various slurry lined mines. The Burch Site proposed slurry wall will be could cause mounding on the south and west and a possible shadow effect on the north and east Existing water levels from borings done in 2004 on the Shores Pit indicate that water is 8 feet to 11 feet below ground surface. The current observed water levels in the wells are shown in Table 2 below. BESTWAIC C O N C R z T E tit A G G R f G A T E P.O. Box 309 MILLIKEN, COLORADO 80543 -0309 970- 356-7523