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III IIIIIIIIIIIII III <br />999 <br />PFtiEIVi<i <br />November 19, 1993 NOV 19 1993 <br />Mr. Joseph Dudash <br />Colorado Division of Minerals <br />1313 Sherman, Room 215 <br />Denver, CO 80203 <br />Subject: Technical Revision <br />Resources, Inc., Pei <br />Adequacy Review <br />Die~e~c~i c. 6iina~a~:. n U,.~::;9Y <br />and Geology <br />No. 23, Golden Eagle Mine, Basin <br />'mit No. C-81-013, Response to Second <br />Dear Mr. Dudash, <br />Basin Resources would like to clarify issues related to Small Area <br />Exemptions (SAES) 1, 8, 9, and 10 per the Division's letter of <br />November 1, 1993. Please review the following responses" and <br />replace the attached enclosures in Exhibit 18, Volume 4. Do not <br />hesitate to call if you should have any questions. <br />~ A.1. The particle size distributions used in the demonstrations <br />were estimated following a review of Map 8, Soils. Once a <br />soil type was identified, an incremental soil texture <br />distribution was input into the model, per the attached table <br />acquired at an OSM TIPS SEDCAD+ Training Course. The textural <br />analysis reflects a representative particle size analysis for <br />specific soils. <br />t~ A.2. Maps 10 and 11, have been certified per Rule 2.10.3(2). They <br />are enclosed for your approval. <br />~/ A.3. Basin Resources will attempt to acquire point source discharge <br />samples during storm events, and will evaluate them for Total <br />Settleable Solids. Basin Resources does not anticipate that <br />such sampling will be possible, as most of the Small. Area <br />Exemption demonstrations show that either a gravel cover or <br />vegetated cover will be adequate to meet effluent limitations <br />with the resultant non-point overland flow. In those <br />demonstrations in which a berm has been designed to handle a <br />25-year 24-hour storm, there should be no discharge. <br />Page 2.05-9 of the permit application has been modified to <br />describe the use of small area exemptions at the mine site and <br />to include a sampling commitment. In addition, Basin has <br />removed the requirement to monitor both hydroxide (OH), and <br />total combustible solids. Neither parameter has recommended <br />water quality criteria standards. Furthermore, total <br />combustible solids is typically a geochemical analytical <br />5990 Greenwood Plaza Blvd. Suite 250 Englewood, CO 80111 <br />(303)850-0930 Fax (303)721-9298 <br />