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Hi9toric Names or Dee¢iptions New Site IDs <br /> Upgradient Shallow y(71AL1 <br /> Downgradient Shallow HGDAL2 <br /> New Downgradient Alluvial Well H(~AL3 <br /> NPDES Outfall 001 HNPIlE51 <br /> NPDES Out£all 002 HNPDE52 <br />Exhibits 12-1, 12-2, and Figure 13-1 in Tabs 12 and 13 depict the locations of all monitors and <br />include the new site ID designatiana. <br />Operational Monitoring Program <br />Monitoring Ratronale and Methodology. Considerable discussion occurred between HGT <br />representatives and COME staff .~egn..1;++;* monitoring approariles, sites, and frequencies that <br />coepriae the existing, operational monitoring program (Technical Peviaion No. 1). The following <br />~^°^°~1ZB9 LhB CORC1ll910n9 reached. T)IB Upgradient 9UrfaOB w8Y8T alld grollnd writer Ydr1ab111ty <br />(potential eonr~m;..s..t 90fir®9 from irrigation return flows, adjawnt dryland fA~;ng drainage <br />Gild 9eap9, and 9eap9 Or 9Uballifa® £1011 frOa thB 1BM19 9hile) CanilOt b0 totally 011minated Or <br />• quantified regardle99 of the location of upgradient monitors. landowner access for the <br />establishment of new upgradient monitors could prove to be costly (access through cropped fields) <br />and could entail significant delays in the construction of new monitors. Gain loss studies <br />performed on Dry Creek during 1993 (sae Tabs 7 and 15) do not indicate flow from either side of <br />the Dry Creek drainage into Dry Creek is occurring during the principal gzowing season. HBCallaB <br />of the positioning of alluvial Walla H(~AII and H(~AL2, their omnpletron and the timing of their <br />construction, true bnsaline data for the Dry Creak alluvial aquifaz was not ob*^:^d1. Chemistry <br />informatron obtained From the new doangradient alluvial wall (HmAL3) indicates the trine alluvial <br />chemistry is vary similaz to the chemistry depicted by Walla HrnsT.1 and H(~AI.2. A coal leachate <br />study and impact analysis performed in winter 1993/1994 (see Tab 15, Table 15-1) demonstrates the <br />coal learhate will not mesm~~ebly impart the Dry Creek and alluvial water quality and is not <br />responsible for the existing water quality in either. The alluvial ag~•;fer has been and <br />continues to be unsuitable for use as irrigation or stock water. Dry Creak hoe been and <br />continues to be unsuitable For irrigation use end suitable to marginally suitable for atocJc use. <br />New downstream and dawngradrent monitors (immediately below the loadout) have been established to <br />replace Sites HGSD2 and H(~AL2 and remove the potential for any additional downgradient natural <br />cllelnical vaziability to be introduced in the water quality analyses. <br />r 1 <br />LJ <br />5 <br />k'N-ol <br />Revised 10/97 <br />