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e-1 <br />HART ENVIRONMENTAL <br />P.O. Box 1,303 Boulaler, Colorado 80306 P11011e 'io'i 114 6602 <br />RECEIVED <br />DIVISION OF RECL4MATION May 21, 2013 <br />MINING AND SAFETy - <br />Mr. Eric Scott <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, Colorado, 80203 <br />Re: Permit No. M -1979 -097 East Rigden Inspection Report Response `-1 <br />Dear Eric: 5 ),D t"- <br />This letter was prepared in response to your April 20',"2013 Inspection Report of <br />Cottonwood Land and Farms, LLC (Cottonwood) East Rigden Sand and Graver Pit (Permit #M- <br />1979-097) located in Larimer County. Specifically, the Inspection Report requires Cottonwood <br />to implement an approved weed control plan and to provide proof to the Division that this has <br />been done and, to demonstrate that the operation is in compliance with the Office of the State <br />Engineer (SEO) regarding augmentation requirements related to ground water exposed as a result <br />of sand and gravel mining at the East Rigden Pit. <br />Enclosed please find a weed control plan prepared by Prime Vegetation Management for <br />East Rigden. Implementation of the plan began this week with the mowing of weeds, including <br />salt cedar on the south side of the railroad tracks. Other weed control measures described in the <br />plan will be implemented throughout the year. <br />Regarding augmentation, when Lafarge actively mined and processed sand and gravel at <br />the East Rigden Pit, it was covered under an umbrella Substitute Water Supply Plan (SWSP) <br />prepared by the Applegate Group, Inc. for Lafarge and approved by the SEO. Transmitted with <br />this letter is the SEO's approval letter dated May 17, 2011 for Lafarge's Middle Poudre <br />Combined SWSP which included the East Rigden Pit. Among other things, the SEO's approval <br />letter describes the total number of pre 1981 exposed water surface acres (25) at the East Rigden <br />pit. Prior to final approval of the enclosed SWSP the SEO requested that Cottonwood indicate <br />the post reclamation location of the 25 acres of pre 1981 augmentation credits at East Rigden <br />(see enclosed Google Aerial and email exchange with the SEO). As you know, under Colorado <br />State Water Law, ground water exposed as the result of sand and gravel mining prior to 1981 is <br />exempt from augmentation requirements. <br />[t cll,vd� B,w641 <br />bwoonnunt,al A I'matJontnt <br />Land Use Pl,mrnn'r <br />Rcclam ation I)esidn <br />Penurftnul &- zoninq <br />