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:: ~~ <br />~- <br />Environmental Services <br />a division of Jericho Industries <br />Environmental Chemistry <br />Site Sampling & Testing <br />-Site Assessments <br />Strategic Planning <br />Soil ))8 Geochemistry <br />M ~ ^k.~tih ~4i~~'~~M ~ , <br />~f ~ t Mr <br />Safety Assessments <br />i <br />Contract Research <br />Wetland Remediation <br />Reclamation Services <br />~~ <br />79 suttee st. <br />P.O. Box 4124 <br />Durango, CO 81302 <br />1.800.553.6266 <br />Fax 970.247.7891 <br />cdsenviro~f'rontier.net <br />Harold Luzar <br />Mine Development, Inc. <br />3319 East 4 Ave. <br />Durango, CO 81301 <br />April 25, 2008 .................. <br />Re: Neglected Mine, Permit # M-1981-165 -Letter of March 14, 2008 <br />Dear Mr. Luzar, - - - - ---- -- -- - <br />We have reviewed the referenced letter and would tike to suggest to <br />Mine Development, Inc. the following: <br />¶ 1 ] As a matter of perspective ail but one of these chemicak are currently <br />used and approved for household use. Naar is used in hot tubs, NaCI is <br />common table salt, Potassium mono 8 persutfate are used to catalyze <br />resins used in arts & craft projects, NaOH, is household lye and is used in <br />oven cleaners, hobby soap making, etc., HCI is used in a variety of toilet <br />bowl cleaners sidewalk cleaners, etc. <br />Again as to perspective all but one of these chemicals are no more <br />dangerous than the average dearer section of a focal supermarket. None <br />are "flammable° as such, alt including table salt are either "toxic°, <br />°corrosive", °reactive° or have "pH extremes" as do hundreds of household <br />chemical products. As a group the proposed d~emicaks are much less <br />toxic/dangerous than many other groups of currently used mineral <br />extraction chemical mixes. <br />It is a given that the proposed chemicals, as well as all dtemieals <br />should be treated with a degree of safety and caution_ CDS would propose <br />the following as prudent measures for chemical safety: <br />A] On site storage should be limited to thirty days of usage_ <br />B] On site storage should be secure and marked. <br />C] Since the proposed process reuses the dzem'tcal mix its storage <br />should be over a containment area. <br />CDS also proposes that the process area be lined with a muttl-layer fiber <br />reinforced material of at least 30 mil, 45 mil would be better. The barrier <br />should be bedded on a low abrasion base, 2/3 filled with course material, <br />layered with filter loth and topped off with a finer material for the work <br />area. The work area should drain to a lined containment area with a <br />holding volume of 500% of the working volume [active- mix + spent mix <br />waiting for reuse]. This pond should be gated to drain to the tailings pond <br />as a fail-safe for an event exceeding 500%. <br />