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The approved demonstrations to allow retention of Pond 007 and 008 are in Attachments <br />2.05.3(3)-16 and 2.05.3(3)-19, respectively. <br />Alternative design criteria and specifications have been approved for use in sediment <br />pond design and/or construction. This decision is based on a thorough analytical <br />demonstration by a qualified professional engineer that the resulting sediment ponds <br />will be as environmentally sound and structurally stable taking into consideration <br />physical, climatological, and other characteristics of the site, and will conform to the <br />impoundment performance factor of safety of 1.3 (4.05.6(11)). <br />E. Acid-forming and Toxic -forming Spoil <br />The Division approved temporary storage of acid- and toxic -forming spoil for more than <br />30 days. This decision was based on a finding that burial or treatment of these materials <br />within 30 days was not feasible and the delay would not result in any material risk of <br />water pollution or other environmental damage (4.05.8(3)). See Section 2.04.6 for <br />identification, mining plan contingencies, and spoil/mine soil reconstruction plans <br />(respectively) that address acid or toxic spoil horizons. <br />F. Impoundments <br />All impoundments have been designed to meet the applicable requirements of Section <br />4.05.9. <br />G. Surface and Ground Water Monitoring <br />1. The applicant will conduct monitoring of ground water in a manner approved by <br />the Division (4.05.13(1)). Surface and ground water monitoring station locations <br />are shown on map 2.04.7-1-A in the permit. The ground water monitoring plan is <br />as follows: <br />a) The current ground water monitoring network consists of 15 monitor wells. <br />b) All wells in the area will be monitored quarterly for water levels adjusted to <br />MSL and samples will be collected on a semi-annual basis for water quality <br />parameters. <br />2. The applicant will conduct monitoring of surface water in a manner approved by <br />the Division. The monitoring plan was submitted under 2.05.6(3)(b)(iii) and <br />includes the following: (4.05.3(2)) <br />a) The current surface water monitoring program consists of quarterly field <br />parameters and quarterly laboratory parameters. <br />c) NPDES sites (sediment pond outlets) will be monitored according to the <br />CDPS permit. <br />23 <br />