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January 7, 2009 <br />D S <br />Environmental Services <br />Harold Luzar <br />Mine Development, inc. <br />3319 East 4 Ave. <br />Environmental Chemistry Durango, CO 81301 <br />Re: Neglected Mine, Permit # M-1981-165 <br />Site Sampling A Testing Dear Mr. Luzar, <br /> We have received your request for additional information on your <br />Site Assessments proposed extraction process to size it for 50-60 pounds of ore with <br /> extraction in a standard cement mixer. We understand that you would <br /> like additional information on the total water and total chemicals used in <br />•_ 4 one of these "smaller" batches. We also understand that you would like <br />Stntrgic Planning recommendations on potential control procedures in case of the spill of <br />" <br />" <br />s an entire <br />small <br />batch. We would like to suggest to Mine Development, <br /> Inc. the following: <br />Soil b Geochemistry <br /> 1] As a matter of perspective all but one of your process chemicals are <br /> currently used for household products and as such are assumed to pose <br /> a low potential impact. <br />Safety Assessments . NaBr is used in hot tubs <br /> • NaCl is common table salt <br /> • Potassium mono-persulfate is used to catalyze resins used in arts <br />Contract Research & craft projects <br /> • NaOH [household lye] used in oven cleaners, soap making <br />etc. <br /> , <br />• HCI is used in a variety of toilet bowl cleaners sidewalk cleaners <br /> <br /> <br />Wetland Remediation , <br />etc. <br /> Again as to perspective all but one of these chemicals are no more <br /> dangerous than the average cleaner section of a local supermarket. <br />Reclamation Services <br /> 2] The chemical that poses the most concern is Sodium Borohydride, <br /> which is a reactive chemical. Specific recommendations are seen <br />t? below. <br />.................................. <br />7 9 S u t t I c S t . <br />31 As outline in our pervious letter [dated April 25, 2008] spilled materials <br />P . O . Box 4124 would be within the proposed containment area. Because of the unique <br />Durango. CO 81302 aspect of the proposed extraction process spilled materials [chemicals <br /> and process ore] can be placed into the next reaction cycle and with <br />1 • 8 0 0 • S S 3 • 6 2 6 6 small chemical adjustments can be used again. Since all operations will <br />Fax q70-247-789l be carried out within the proposed containment area any true loss of <br />edsenviroui-frontier. net process chemicals would be small. Below is a summary of the proposed <br />.............................. amount of process materials that would be used in a single "small" 50# <br /> batch