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• March 2000 -5- 993-2099.150 <br />As part of the Phase N design, a water balance was conducted to determine the volume of <br />solution that will be generated as a result of the additional Phase N area. The water balance <br />model included the existing Phase I and Phase II PSSA's and the new Phase N PSSA. The <br />water balance model accounted for normal operating volume, solution accumulation due to <br />seasonal climatic vaziations to a 95 percent confidence interval, 12-hour draindown during <br />pump outages, and excess water during exVeme climatic conditions (100-year, 24-hour storm <br />event), while maintaining the minimum freeboard of five feet for the Phase II and Phase N <br />PSSA's. As in Amendment No. 7, three feet of freeboard will be maintained for the Phase I <br />PSSA. <br />Operational and post~losure surface water diversion systems have been designed around the <br />perimeter of the VLF. The operational Phase N diversion channel will be constructed along <br />the margins of the VLF. During the construction and operation of the Phase N VLF, <br />temporary surface water diversion channels also will be constructed to route surface water <br />flow away from disturbed areas, as needed. The diversion system has been sized to route <br />storm water from portions of the mine areas and VLF to the Bateman Creek drainage. The <br />post-closure surface water diversions are located along the margins of the reclaimed VLF <br />slopes. Permanent surface water diversion channels have been sized to divert upgradient <br />surface water generated from the 100-year, 24-hour storm event. <br />1.2 Scope of Work <br />The purpose of Golder Associate's Inc. (Golder) work, reported herein, was to provide <br />CC&V with engineering services for the design of Phase N. This document supports the <br />engineering design and CC&V's permitting activities. This document includes the <br />following: <br />LJ <br />1:\99Q099\FINAL REPORT]W9MAIN:.DOC Golder Associates <br />