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• <br />Applegate <br />Group, ~~~. <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: ~N,,,,.,,~/'~~ 89-~aD <br />• ~~ ~~ <br />~~ <br />Permit #: It/-~9-laa Confidental? <br />Class: ~~p~~tn.i Type-Seq.: Sao <br />From: To: <br />Doc. Na ~`,ret~..•rw.,.m g ~,,, ww,. <br />Doc. Date (if no d~t~~ amp): ~T <br />As requested, I have completed an initial review of the alluvial aquifer conditions surrounding <br />the Platte Valley 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 mining petniit for the Platte Valley Pit to C&M <br />Companies on July 16, 1993 under permit number M-89-120; Aggregate Industries -WCR, Inc. <br />has since acquired this site. The substitute supply p1a13 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, Geo. 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 West 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 River. Dry mining techniques are currently <br />being used at the site to extract material below the ground water table. Ground water inflows <br />into the mined area have been collected and returned back to the South Platte River via pomp <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 />149`1 'Nest 170°' A~ierwe;, 9ntr~ 2Ull 6441 Hoeing Drive, Suite 200 <br />Dnnvei, ~„>Iemde °093-1-7128 -wpm appic-9tel9group ~.an Loveland, Colorado 8063&6655 <br />(":03i -~'~-`~>'i11 • Fa'. (3031 ~15L-7759 (570; 4C, 1-9A84 • Fax 19%0) 613-1177 <br />