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DRMS Comment Text(from DRMS letter AR Round 2) OSMI Responses Comment# Please provide the original notarized copy of the Structure Agreement included in Exhibits S between Six Basins A complete copy of the structure agreement with Six Basins was provided with our PAR responses,but it looks as SO and OSMI for the public restrooms located on CR 26. though the signature pages were inadvertently inserted after the USFS Agreement in the electronic version.A complete copy of the structure agreement with six basins is provided in updated Exhibit S for convenience.We apologize for the mistake. Pursuant to Rule 6.4.21(lo)(a)all stormwater control features and diversions to control run on/off water are Comment noted although OSMI does not agree that all stormwater control features meet the definition of an EPF considered EPF's. as defined by Rule 1.1(24).However,in the spirit of cooperation,Exhibit U has been updated to list stormwater a.Pursuant to Rule 6.4.21(2)all EPFs shall be identified on a map.Please update map U-1 accordingly,note a control features as EPFs.Map U-1 also has been updated to label these different controls as EPFs. second map for Governors Basin may be necessary. Run-on control features were designed and certified by a P.E.and approved by DRMS as part of the original b.Blease update the list of EPF's on page U-6 to incorporate stormwater features identified above.Additionally permit application and recertified post-construction with the submittal of Amendment 1(See Drawing G-5 for PE revise table U-4 to include all EPF's. certified designs for Diversion Ditches and Collection Channels and Map G-1B for the location of the channels and ditches).Note-the naming convention for these features have changed over the years as certain features were 51 not constructed as planned in the initial permit application,however,the designs did not change.A description of these features has been added to Section 10.1.6 of Exhibit U and designs are provided in Updated Appendix 2.See updated Exhibit U for details(note the old drawings from the original permit application and Amendment 01 were not formatted to print on 11x17 so the signature hlock was cut off of the printed copies.The actual scanned originals may be found in the electronic version submitted via e-permitting and on the DRMS Laserfiche site). On Table U-1 the designated chemical name for Sodium Isopropyl Xanthate is blank on column 1,please revise Table U-1 has been revised to include the chemical name sodium isopropyl xanthate in Column 1.Please see 52 Table U-1. updated Exhibit U in Attachment 1. Under TR-14,Copper Sulfate is only authorized to be stored in 26 gallon or 50 lb.sacks for a total volume to be Table U-2 was revised to be consistent with the volumes of reagents used as was presented in Table 1 of TR-14. stored on site of 336 gallons or 500 lbs.Tables U-2 and U-3 reference storing a significantly larger volume of Table U-3 is maximum volume of reagents in liquid form stored on site and includes up to 500 lbs.of dry copper reagent,please revise the tables to coincide with the approved volumes of TR-14. sulfate stored in 50 pound sacks.Purchasing practices have changed and OSMI is currently purchasing dry copper 53 sulfate in 1000 kg supersacks.We anticipate storing one 1000 kg supersack of cupper sulfate in the new Reagent Room.This amount would be in addition to the volume of copper sulfate in use in solution at any given time. Table U-3 is consistent with what was agreed to in TR-14 and therefore did not require updating. Table U-3 lists Lime packaging size as a 100 lb.super sack.Please clarify the Reagent Packaging Size in Table U-3. Table U-3 has been updated with an accurate weight for the lime super sacks to 1000 kg(2,204 lbs.). 54 Page U-26 of Section 7.2.5(references section 9.3,which does not exist)does not provide sufficient discussion to The correct citation to the passive mine water treatment system is Section 10.1.5,which includes a detailed 55 address the requirements of Rule 6.4.21(7)with regards to the Passive Mine Water Treatment System.Please discussion of the passive mine water treatment system.Exhibit U has been updated with the correct reference to update this section. Section 10.1.5.Please see Updated Exhibit U in Attachment 1. Page U-30,in addition to other exhibits throughout the application materials references the completion of new The proposed GW monitoring wells will be located to the southeast of the main entrance between the slope groundwater monitoring wells at a later date.Please provide additional details regarding this set of wells such as; where the new warehouse is located and the wetland area to the east.The approximate location is shown on Map a more precise location, estimated drill depth, construction information and tentative construction schedule. G-1.The depth of the wells will be dictated by the depth to groundwater encountered during drilling.A general Please note that these wells will be required to be completed and sampled in accordance with the approved schematic of the wells,which will be similar to GW wells 1A and 1B is provided in Attachment S.As we have no 56 Groundwater Monitoring Program prior to the resumption of milling activities at the site.Please update all other wells in this location,it is impossible to predict how deep the wells will be.A general rule of thumb would be to exhibit references and maps as necessary to support this proposal. install the wells in a manner consistent with other monitoring wells on site with a shallow and deep well to capture seasonal fluctuations in groundwater levels.We expect the wells to be approximately 15 and 30 feet. OSMI understands that the mill cannot be certified unless these wells are installed and sampled. 57 Page U-29 section 8.4 references section 7.3 for more info,however this section does not exist under Exhibit U. Section 8.4 has been updated to reference Section 8.3 Site Geology instead of Section 7.3.See updated Exhibit U Please update this reference. in Attachment 1 for details. Amendment 02 AR Responses Round 2 M-2012-032 6of8