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<br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />COLORADO <br />D I V I S I ON OF <br />RECLAMATION <br />MINING <br />SAFETY <br />Bill Ritter, Jr. <br />Governor <br />INTEROFFICE Harris D. Sherman <br />MEMORANDUM Executive Director <br />Ronald W. Cattany <br />Division Director <br />TO: Joe Dudash Natural Resource Trustee <br />FROM: Jim Stark <br />SUBJECT: Bowie No. 2 Technical Revision 51 <br />Chemical Analysis of Sandstone at Paonia Sewage Lagoons <br />DATE: 15 February 2008 <br />As per your request of 11 February 2008, I have reviewed the chemical analysis of the <br />sandstone transported from the Bowie No. 2 Mine vent shaft excavation to the Town of <br />Paonia sewage lagoons. Based on the single analysis report submitted, it appears as <br />though the rock is, in fact, inert, and meets established guidelines for nontoxic, non-acid <br />forming materials. Below I provide a detailed analysis of the laboratory results preceded <br />by several basic questions pertaining to the lab results as a whole. <br />1. BRL states that the sample that was analyzed is a "representative sample". <br />Given that 1,700 tons of rock were hauled to the Paonia sewage lagoons, the <br />Division would like to know how the sample was taken and why it is believed <br />that a single sample is a representative sample. <br />2. Assuming that the sample was taken correctly, as asked in question 1 above, <br />the next question is how was the sample prepared. Either a written description <br />of the sample preparation procedure (from the laboratory) or a reference to a <br />standard method or procedure for sample preparation would be acceptable. <br />3. Although the analysis results show a basic methodology used in analyzing the <br />sample (saturated paste extraction, hot water extraction, etc.), the Division <br />would like a more specific method for each parameter listed (for example, <br />USDA method x, USEPA method y, etc.). <br />4. There are several constituents that were analyzed that were given a "U" value, <br />which indicates that the value for that constituent was less than the method <br />detection limit (MDL). Although this is standard practice, the Division would <br />STATE OF COLORADO <br />Office of _ Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines