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w <br />Mr. James C. Stevens <br />April 6, 1998 <br />Page 2 <br />~, <br />Prior to sampling, monitor well MWS was purged of a minimum of three well volumes of water <br />or until the well was dry and allowed to recharge. On-site measurements of electric conductivity, <br />pH, and temperature were recorded to ensure that the well stabilized so that a representative <br />sample of the aquifer was collected. Copies of the field acdviry forms are attached. Samples were <br />collected with a Teflon disposable bailer and placed on ice until delivery to the laboratory for <br />analyses. The samples analyzed for metals, nitrates+nitrites, fluoride, chloride, total dissolved <br />solids (TDS), and pH were filtered in the field (.45 microns). Chain-of-custody forms <br />accompanied the samples throughout the shipment and are included with the attached analytical <br />report. The month indicated on the chain-of-custody form, originally indicating November, was <br />in error and was corrected by the laboratory. <br />Laboratory results indicate that samples obtained from well MWS were below the permit limits <br />for all the required parameters and the landfill is in compliance. The permit limits were <br />established by using the Human Health Standards and Secondary Drinking Water Standards tables <br />contained in The Basic Standards for Ground Water or are at the method reporting limit of the <br />laboratory. Analytical results, Human Health Standards, Secondary Drinking Water Standards, <br />TDS Standard, and the Groundwater Organic Chemical Standards are summarized in Tables 2, <br />3, 4, and 5, respectively. Copies of the laboratory report and chain-of-custody form are attached. <br />Greystone appreciates the assistance of the Division of Minerals and Geology with this project. <br />If you have any questions, please contact me at (303) 850-0930. Greystone will conduct the next <br />quarterly sampling event for the "longlist" of analytical parameters in June 1998. <br />Sincerely, <br />/(,~-~ n.~hl~ <br />Nick Mathis, C.P.G. <br />Geologist <br />Enclosures <br />cc: Mr. Robert Vasquez, Costilla County <br />7J096.Irr\484\4/6/98 <br />