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2.3 Groundwater Monltoring -Hew Horizon 1 Mlne <br />' The total number of groundwater monitoring locations at New Horizon 1 is fourteen (14). The <br />monitoring schedule and parameters being monitored are shown in Table 1. All wells are monitored <br />t monthly for water levels. Water quality parameters as listed in Table 2 are analyzed on a semi- <br />annual basis. These levels are adjsuted to mean sea elevation. <br />2.4 Groundwater Monltoring -New Horizon 2 Mlne <br />' The New Horizon 2 Mine groundwater monitoring program includes locations directly up and down <br />gradient of the site. The approved plan consists of existing wells that monitor the overburden, <br />Dakota Coal and the underburden aquifers (GW-N36, GW-N37 and GW-N38) in the northeast <br />comer of the site, and two alluvial wells (GW-N39 and GW-N40) located on Calamity Draw <br />upsVeam and dawnsVeam of the mine permit boundary (Plate 1). These five were the latest wells <br />completed in May 1993. The upstream well (GW-N39) is located in the flood plain near Lincoln <br />t SVeet in the south-east comer of the mine while the downsVeam well (GW-N40) is located down <br />gradient of the mine but up gradient of the Nucla waste water lagoons in Calamity Draw. <br />Western Fuels acquired access to the cluster of wells located in the southwest corner of the project <br />azea (wells GW-N16P1, GW-N17P1, and GW-N18P1) during July 1993. Monitoring of these wells <br />' resumed at that time. <br />All wells are monitored on a monthly basis for water levels. These levels are adjusted to mean sea <br />elevation. Water quality parameters are collected and analyzed for the parameters listed in Table <br />2 on a quarterly basis. Quarterly samples are conducted in February and November during the non- <br />, irrigation season and in May and August during irrigation season. <br />6 <br />