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June 24, 2003 -45- 003-2203.7 <br />• 7.0 INTERIM WATER BALANCE <br />As identified in Technical Revision (TR) 40 to Amendment No. 8 to Office of Mined Land <br />Reclamation Permit M-1980-244, a revised water balance analysis was completed to quantify the <br />probable volume of solution within the VLF over time due to normal processing, water gained by <br />precipitation, lost to evaporation, and moisture retained in the ore matrix. The monthly model was <br />developed for the period from January 1995 through January 2020 for the entire VLF. The results of <br />the water- balance indicate that the interim storage requirement for the Phase N PSSA below <br />elevation 9606 is 29.1 million gallons (MG). <br />Based on as-built survey, Golder calculated the pore space volume of the Phase IVb PSSA below <br />elevation 9606 to be 5,617,444 cubic feet. This calculation uses the maximum ore depth of 51 feet <br />and an in-place ore density of 95.2 pcf, with a corresponding ore porosity of 0.34. This would result <br />in a storage capacity of 42 MG, indicating that the constructed volume is greater than the design <br />volume. <br />Calculations and stage-volume curve to verify the storage capacity are included in Appendix P. <br />~J <br />mooazosoaoo~e~ic.nesseooo3~oozzzo~.oaoa.a~wwx.P.aoo Golder Associates <br />