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1 l Fe ~. ~PGt~ <br />-~'~ Applegafie ~~ <br />~w <br />Group, tn~. <br />April 17, 2002 . . <br />Ms. Jamie Gaboriau <br />Manager of Environmental Affairs. <br />Aggregate Industries - WCR, Inc. <br />3605 South Teller Street - - <br />Lakewood, Colorado 80235 <br />Dear Jamie: <br />As requested, I have completed,an initial review of the alluvial aquifer conditions surrounding . <br />the Platte Va11ey.Pit. In,particular, I tried to determine to what extent, if any, the dewatering <br />operations at the site may have upon water level declines in area irrigation and domestic wells: <br />The information used to complete this review, was primarily based .upon currently available <br />resources such as the USGS or State Engineer's Office records. Additional information, such as <br />well water level information, that might become available later on may require that we revisit the <br />conclusions arrived at in this preliminary investigation.: <br />GENERAL <br />The Division of Minerals and Geology issued the min~rtg permit for the Platte Valley Pit to C&^d <br />Companies on July 16, 1993 urider permit number M-89-120; Aggregate Industries =. WCR, Inc. <br />has since acquired this site. The substitute supply plate for the Platte Valley Pit was approved by <br />the State Engineer's Office on August 10, 2000 .and was subsequently amended by Applegate <br />Group, tno. on February 12, 2001 to reflect a change from wet to dry mining techniques and to <br />include this site in Aggregate's Combined South Platte River Replacement Plan (Combined <br />Plan). The State issued its original approval of the Combined Plan,.which included the Platte <br />Valley Pit, on October 31, 2001; a subsequent approval was issued on November 19, 2001. - <br />SITE LOCATION <br />The Platte Valley Pit is located in Sections 30 and 31, Township 1 North, Range 66 Wesf in <br />Weld County. The site is located north of Brighton and west of Highway 85. The Platte Valley <br />Pit is being mined in the alluvium of the South Platte Rives. Dry mining techniques aze currently <br />being used at the site to extract material below the ground water table. Ground water inflows: <br />into the mined azea have been collected and returned back to the South Platte River via pump <br />and pipelines. More recently, water has been discharged into a ski lake just east of HWY 85. A <br />vicinity map, Figure-1, is included for reference. <br />M149s Wes1120'" Avenu=, Suite ?OU 5441 Boeing Drive, Suite 200 <br />Denver, Cnbrado 80234-2723 www.aFVle9alegroup.cnm Loveland, Colorado 80538-8855 <br />1303} 45?-6ti I t • Far (3031452-2739 - (970j 46 69884 • Fax (97U} 613-1177 <br />