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Mr. James C. Stevens <br />January 4, 1999 <br />Page 2 <br />iron, manganese, pH, and zinc) listed in the Colorado Depattment of Health, Water Quality <br />Control Commission, The Basic Standards for Ground Water. Standards are presented in Tables <br />2 and 3. In addition, all monitoring wells were measured for depth to water to determine the <br />groundwater gradient and flow direction. <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 activity forms are attached. Samples were <br />collected with a Teflon disposable bailer and placed on ice until delivery to the laboratory for <br />analyses. <br />Laboratory results indicate that samples obtained from well MWS were below the permit limits <br />for all the required parameters. The petmit limits were established by using the Human Health <br />Standards and Secondary Drinking Water Standards tables contained in The Basic Standards for <br />Ground Water or are at the method reporting limit of the laboratory. Analytical results, Human <br />Health Standards, Secondary Drinking Water Standards, TDS Standard, and the Groundwater <br />Organic Chemical Standards are summarized in Tables 2, 3, 4, and 5, respectively. Laboratory <br />results for pesticides and herbicides were reported below the analytical method detection limits. <br />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. <br />Sincerely, <br />i1 w~ <br />Nick Mathis, C.P.G. <br />Geologist <br />Enclosures <br />cc: Ms. Elizabeth Pacheco, Costilla County <br />