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tape on each of the piezometers at each of the three <br />sites. Again, the data should be plotted and trends <br />noted. During the course of the drilling of the pie- <br />zometers, samples of the soil material should be <br />collected and archived as appropriate. <br />(4) An open -cased ground -water monitoring well should be <br />drilled at a site downgradient of the seepage collec- <br />tion pond, to comply with provisions which will be <br />adopted pursuant to the authority of the Resource <br />Conservation and Recovery Act. This will permit <br />determination of potential ground -water contamina- <br />tion downgradient of the seepage pond, and will as- <br />sist in complying with RCRA regulations when they <br />become in force. Ground water should be collected <br />at least monthly from this site, after pumping a <br />volume of water at least equivalent to four times the <br />volume of water contained within the casing. The <br />ground water samples should be appropriately preserved, <br />and analyzed in accordance with Table 6-4 of the at- <br />tached EPA publication, "Monitoring Industrial Waste <br />Water." Samples should be assayed for the parameters <br />on the attached list. <br />(5) Surface water quality and diversity and number of <br />benthic macroinvertibrates should be documented in <br />Miner's Creek where it crosses under Highway 149, <br />prior to discharge into the Rio Grande. While it is <br />not expected that operations of Homestake Mining <br />ME <br />