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Please see the attached signed affidavit from the Alma Placer Mine certifying that all <br /> imported materials to be used during reclamation are clean and inert. A blank affidavit to be <br /> signed by each Contractor every time an import is made to the Alma Placer Mine remains in <br /> the AM-6 permit file to be completed and retained on site. <br /> 20. The Mining Plan states (D-6) the equipment storage building has concrete block walls which <br /> are sealed for secondary containment. Please specify what materials are being stored in the <br /> equipment storage building which require secondary containment. <br /> This building contains various small quantities (<50 gallons) of oils and grease for <br /> equipment maintenance. <br /> 21. The Mining Plan states (D-8) no toxic or acid-forming materials have been encountered <br /> during the mining operation. On February 20, 2018, the Division forwarded a copy of a <br /> citizen complaint, which indicated mercury was historically used at the Alma Placer Mine <br /> and is being mobilized into the environment by current mining operations. Please provide <br /> the Division with any information which the Operator has regarding the historic use of <br /> mercury at the Alma Placer Mine. In addition,provide any available data from water quality <br /> or soil quality testing which has been performed at the site. <br /> Mercury was historically used in the amalgamation process at the end of the sluice box in <br /> placer mining. Since the Alma Placer Mine contains substantial areas of previously placer <br /> mined ground, from prior to good environmental controls, it is possible that mercury was <br /> used onsite. Based on this possibility, Greg Lewicki and Associates sampled various spots <br /> on the site for a Phase l ESA in 2009. The results of this sampling are attached to this <br /> response letter. No mercury was found in any of the samples, which were both soil and <br /> aqueous in nature. <br /> 6.4.5 Exhibit E—Reclamation Plan <br /> 22. The Reclamation Plan states (E-1) the Operator reserves the right to alter the revegetation <br /> plan for areas where it has been difficult to establish vegetation. The Operator should note <br /> that any changes to the Reclamation Plan must be first approved through the appropriate <br /> revision process. Please respond. <br /> Please see the revised Exhibit E. <br /> 23. The Reclamation Plan states (E-1) topsoil will be replaced to a depth of 3 inches over pre- <br /> law areas. Under Amendment No. S (AMOS), the Operator committed to replacing substitute <br /> fines to a depth of 4.5 inches. In absence of a technical justification for reducing the depth of <br /> fines over pre-law areas, the Division will require the Operator to adhere to the commitment <br /> made under AM95. Please revise all applicable sections of the application to show 4.5 <br /> inches of substitute fines will be replaced over pre-law areas. <br /> Fines will be placed over all pre-law areas to a depth of 4.5 inches as approved in <br /> Amendment 5. See revised Exhibit E. <br />