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-6� <br /> DLRAY SILVER MLNES <br /> b. Dura-plate 8200: This product requires concrete to cure 28 days @ 75F prior to application. <br /> What's the anticipated wait time given the specific site conditions? No rating against <br /> chemicals was provided, please include more information. <br /> Response: Both FastStop SL23 and Dura-Plate 8200 will be used. Based on correspondence with the <br /> manufacturer, these sealants were determined to be the most efficient epoxy for the chemical regents <br /> used in the Revenue Mill. The Dura-Plate 8200 is the topcoat and must be used to get the full effect of <br /> the sealant. <br /> a. The System Guide for FastStop SL23 states the epoxy can be applied to "green concrete,"which <br /> is normally 7-10 days depending on the concrete mix.Per correspondence with the manufacturer, <br /> repairs to Faststop SL23 are the same as Dura-Plate 8200. It is expected that there will be <br /> minimal repairs to the SL23 as most repairs will apply to the 8200 topcoat for normal <br /> maintenance. <br /> b. Based on correspondence with the manufacturer,Dura-Plate 8200 must be applied to SL23 within <br /> 24 hours to be effective. If it were to be applied to just concrete the 28-day cure time would be <br /> needed, but that wait time is not necessary since it is being applied to the SL23. Correspondence <br /> with the manufacturer also indicated that the low humidity in the region will not impact the <br /> effectiveness of the product. Reagent SDS sheets were provided to Sherwin Williams to confirm <br /> the specific epoxies to be used. The 8200 will enhance the rating of the SL23 below it. <br /> 15. Is there any way to evaluate when the barrier (epoxy) needs replaced other than apparent spots of <br /> damage? Provide any sort of maintenance schedule or inspections to ensure it remains impermeable? <br /> Response: The manufacturer recommends an evaluation of the epoxy at 6mos- 12mos as routine <br /> maintenance. The mine will include a visual assessment of the epoxy coating to the daily inspection <br /> sheet. The visual assessment will ensure that the epoxy coating is checked regularly. The visual <br /> assessment will check the epoxy for wear patterns that may develop after a few years -similar to carpet <br /> as the manufacturer describes. <br /> 16. It is understood that all piping will be pressure tested after assembly, however a portion of that <br /> piping leaves the reagent room and enters the Mill, please clarify if the reagent piping will be <br /> pressure tested separately or if the pressure test will be performed when the piping is connected to <br /> the applicable pipes in the Mill and the greater Mill Reagent piping system will be tested as one <br /> unit. <br /> Response: Both. The reagent piping segments will be pressure tested separately as they are assembled. <br /> Once the entire system is assembled it will be tested as one unit. <br /> 17. The QA/QC table is somewhat abbreviated, but sufficient. The Division does not have <br /> access to the ASME database so the benchmarks need to be explicit stated. This along with the <br /> supporting documentation of the tests performed will make tracking of the tests easier. Provide the <br /> Division with the referenced ASME standard. <br /> 51Page <br />