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will be as environmentally sound and structurally stable taking into consideration <br />physical, climatological, 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 <br />than 30 days. This decision was based on a finding that burial or treatment of these <br />materials within 30 days was not feasible and the delay would not result in any <br />material risk of water pollution or other environmental damage (4.05.8(3)). See <br />Section 2.04.6 for identification, mining plan contingencies, and spoil /mine soil <br />reconstruction plans (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)). The ground water monitoring plan is as follows: <br />a) WFC maintains and operates a ground water monitoring network at the <br />New Horizon 2 mining areas that currently consists of 12 monitor wells. <br />Each monitoring well is measured for static water level on a monthly basis. <br />In order to obtain specific baseline water level information at New Horizon <br />2, a total of 22 monitor wells were drilled and completed. In June of 1986, <br />16 monitor wells (GW -N13, GW -N14, GW -N15, GW -N16, GW- N16P1, <br />GW -N17, GW- N17P1, GW -N18, GW- N18P1, GW -N19, GW -N20, GW- <br />N21, GW -N22, GW -N23, GW -N24 and GW -N25) were installed. During <br />August and September of 1987, six additional monitoring wells were <br />installed, (GW -N29, GW -N30, GW -N31, GW -N32, GW -N33 and GW- <br />N34). Measurements for static water levels began at these wells <br />immediately after they were completed and developed. All of the water <br />level data are presented in tabular and graphic form in Appendix D of <br />Attachment 2.04.7 -1 Hydrological Monitoring Plan. Five more wells (GW- <br />N36, GW -N37, GW -N38, GW -N39 and GW -N40) were added in May <br />1993. The first three wells were drilled in the north -east corner of the <br />permit area. The last two wells were drilled along the Calamity Draw. <br />During November 1998, six (6) new ground water monitoring holes were <br />installed to collect baseline data. Three of these (GW -N41, GW -N42, and <br />GW -N43) were located in an up dip area while the other three (GW -N44, <br />GW -N45 and GW -N46) were located in a down dip area of the revised <br />29 <br />