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these new chemicals and their use and storage. These chemicals are safe and present no threat to the <br />environment, especially in the quantities listed. <br />The chemicals are listed below: <br />Aerophine 3418A-10 gallons <br />Aero XD 504-2 gallons <br />Aero XD 202- 2 gallons. <br />These are all Cytec products. <br />In the chemical storage area, a 90 gallon portable spill kit has been placed which can be used to clean up any <br />spills in the reagent room. Employees assigned to this room have been trained to inspect the pumps, piping, <br />chemical containers and the epoxied berm for leaks, cracks or other malfunctions. They have also been trained <br />in the use of the spill kit and reporting procedures as part of a certified HAZWOPER training program. A phone in <br />the room can be used to immediately report any spills, leaks or other issues. <br />6. Tailings Chemistry and Water Quality at the Tailings Embankments <br />During the test operation, experimentation took place with various chemicals, pH, equipment modifications and <br />flow rates in order to maximize the recovery of sulfides with the concentrates. The tailings consist primarily of <br />ground andesite which has varying percentages of limestone (normally 10% to 20%). Other minerals include <br />feldspar, quartz, mica and minor amounts of iron pyrite. The particle size of the tails is -100 mesh. Some clays <br />also exist in the tailings (approximately 5% to 15%). In order to ensure that the tailings will not leach metals or <br />other toxic or acid forming chemicals into the environment, various controls have been put in place in the <br />approved permit. <br />a) Tailings SPLP Tests <br />A standard for the chemistry of the tailings was submitted by the operator and approved by the Division in 2014. <br />This standard set limits for many ions that could potentially affect the environment, while taking into account <br />the baseline chemistry of the existing waste rock, which was placed on the site during mine operation in the late <br />1800's and early 1900's. In order to minimize metal sulfide minerals in the tailings, it was allowed that the <br />tailings could be placed in the embankments at a pH from 6.0 to 10.5. The pH of the downstream wells <br />(discussed below) must be from 6.0 to 9.0. The SPLP test places the tailings in a known volume of dilute acid and <br />then agitates the slurry for 24 hours in order to coax any metals or other ions into solution, which will indicate <br />that they could leach into the environment. The results of the SPLP tests of the tailings and the comparable <br />standards are presented in Appendix 2. All results show that the SPLP tests of the tailings meet the compliance <br />standards. <br />Revenue Mill Certification Page 17 of 20 <br />