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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman 5[., Room 21 S <br />Denver, Colorado 80203 DIVISION O f <br />Phone: (303) 866-3567 MINERAL $ <br />fAX: (303)832-8106 & <br /> GEOLOGY <br /> REG LAMATION <br /> MININ G•SAFETY <br />February 26,2002 <br /> Bill Owens <br /> Governor <br />Connie Nickle Davis <br />Greg E. Walther <br />Support Services Executive Director <br />Aggregate Industries MichaerB. Long <br />P.O. Box 337231 Division Director <br />Greeley, CO 80633 <br />RE: Permit M-1999-021 Stegner Farms, Aggregate Industries Technical Revision TR-003 <br />Dear Ms. Davis, <br />The Division of Minerals and Geology (DMG) has reviewed the report received at the DMG office February 20, <br />2002, filed as a requirement of technical revision (TR-003) to permit M-1999-021. The report appears to adequately <br />address the issues and concerns related to the down gradient effects of the slurry wall at the Stegner Farms site. <br />Though the report admits that the slurry wall is probably affecting the groundwater levels down gradient of the site, <br />the report also adequately identifies that these effects are magnified by the other variables of two years of drought, <br />local groundwater withdrawal, and a cessation of irrigation at the site. <br />The DMG does have one lingering concern regazding the effects of the slurry wall at the site. The report indicates <br />that the groundwater is mounding up gradient of the slurry wall. In that precipitation levels have been reduced for <br />the past two years, the DMG is concerned as to the affects up gradient of the slurry wall during a yeaz of average or <br />increased precipitation. Measurements recorded at the up gradient well, S-2, revealed that groundwater was within <br />2 feet of the ground surface of a period anywhere between one day to nearly three weeks after installation of the <br />slurry wall. Therefore, the DMG requests that Aggregate Industries adhere to the following: <br />• Continue the monthly monitoring of water level measurements at all the monitoring wells relative to the Stegner <br />Farms pit. _ <br />• Adhere to the commitment to commence weekly water level measurements if the groundwater level reaches <br />within 2 feet of the ground surface. <br />If you have any further questions, please do not hesitate to contact me at (303)866-4935. <br />Sincerely, <br />~)~~~~ <br />K/ate Pickford <br />Environmental Protection Specialist <br />cc: Carl Mount; DMG (electronic) <br />Kathy Troudt Riley, attorney for Dawin Roe and William Martin <br />