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Mr. James C. Stevens <br />January 8, 1997 <br />Page 2 <br />Laboratory results indicate that samples obtained from wells MW1 and MW4 were below <br />detection limits for pesticides, PCBs, herbicides, semi-volatile organics, and volatile organics. <br />TDS were within the acceptable range for groundwater. The remaining analytes, identified in the <br />Human Health Standards and Secondary Drinking Water Standards tables with The Basic <br />Standards for Groundwater either were below the method detection limits or below the respective <br />standards with the exception of barium and fluoride. Barium and fluoride concentrations were <br />slightly above the Human Health Standards in wells MWl and MW4. MW1 is located upgradient <br />from the landfill. Therefore, the barium and fluoride concentrations may be naturally occurring <br />as a result of local lithologies. Analytical results for the Human Health Standards and Secondary <br />Drinking Water Standards are summarized in Tables 1 and 2, respectively. Copies of the <br />laboratory report and chain-of-custody form are attached. <br />Groundwater elevations were measured in the monitor wells on December 4, 1996. The top, north <br />side of the well casings were used as the reference elevation point to measure depth to <br />groundwater. Groundwater elevations were calculated using the measured groundwater elevation <br />data and the surveyed well casing elevations. The groundwater level measurements collected <br />during the site visit are included in Table 3. A groundwater gradient and flow direction was not <br />determined because only two monitor wells contained water. <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 />Nick Mathis, C.P.G. <br />Geologist <br />RF/ss <br />Enclosures <br />cc: Mr. Robert Vasquez, Costilla County <br />IOD29615.LTR\d84\I\I /8/97 <br />