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~~ - - <br />;. <br />Banks and Gesso, LLC ~~~ ~~~~~~~ ~~~~~~ ~~~ et,•te , t 7 <br />s ,rado 80215 <br />(3031274-4277 <br />Fax (303) 274-8329 <br />RECEIVED <br />July 2, 1999 <br />JUL 02 1999 <br />Ms. Christina L. Kamnikar DivisionotMineraf'S,Geology <br />State of Colorado <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Response to Second Technical Adequacy Review <br />Stegner Farm Sand and Gravel Mine, File No. M-99-021 <br />Dear Ms. Kamnikar, <br />This letter addresses the technical issues raised in your letter dated July 1, 1999 <br />regarding the 112 application for the subject property. Responses and additional <br />information are discussed below. <br />,~ <br />The Applicant proposes to install six groundwater monitoring wells on the Stegner <br />property at the locations indicated on the attached site plan. The wells would be <br />approximately 15-20 feet deep. These wells would be installed between the permit <br />boundary and the slurry wall alignment, prior to construction of the wall. These wells <br />would be measured on a monthly basis dw~ing the life of the mine, to measure <br />groundwater levels. <br />Discussions with Mr. John Stegner indicate that problems with crawl spaces and <br />septic systems occurred when major storm ev=nts caused the groundwater to rise to <br />within two feet of the natural ground surface. -fhe Applicant proposes to increase the <br />monitoring frequency to weekly, whenever any of the monitoring wells indicate <br />~ groundwater within two feet of the natural ground surface. The Applicant agrees that <br />three consecutive weekly readings of groundwater depths of two feet or less would <br />trigger the need for a drainage system to mitig+3te the shallow groundwater condition. <br />Also attached is a revised diagram of the seF~aration berm between the two ponds, <br />more clearly indicating the specifications for pond lining material. <br />