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Jan -15 -98 09:18A Colo Geo SUVV42y 3038662461 P_03 <br />A water sample of a seep observed in Coal Creek was analyzed for total RCRA <br />metals by method 601 OA and 'Total Petroleum Hydrocarbons (TP1 l) by method <br />1664. Concentrations of the. tc :ste d parameters were below reporting limits <br />except for a 0.30 parts per million (ppm) concentration of barium, which is twlow <br />the Colorado Ground Water Standard. A sample from a seep in Coal Creek at a <br />different location was collected in '1995 and analyzed for VOCs. Resu(N of that <br />sample. slid not indicate significant concentrations of VOCs present. Activities <br />from the 1995 investigation are detailed in a letter repc)rt that has been submitted <br />to the Colorado Division of Minerals and tic4t1ogy. <br />A sail sample from what appeared to hc!, by visual observation and field testing,, <br />a "worst cast" soil ;ample from the drilling investigation way colle -dvd Lind <br />catalyzed for semi VOCs and TPI 1. Results of the semi VOC analyses recorded <br />concentrations below reporting limit% for all of the compounds except <br />phenanthrene (850 lipb) and Lis (2- ethylhexyl) phthalate (1200 ppb). Thew <br />compounds do not currently have action limits but a proposed action limit for bis <br />(2- ethylhexyl) phthalate is several orders of magnitude higher than the detected <br />concentration. A proposed action limit for phenanthrene could not 1xi found. <br />Although analyses of soil and grand water sample from the site give little <br />evidence of subsurface contanilation, visual observations and field tests, <br />indicated that spill; and /or leaks have occurred in the past. Contaminant levels <br />at this point do not justify substantial remediation. Soil in the immediate vicinity <br />of the forever mainteneulce facility may likely be stained rind /or contain <br />petrc,lcum odors. Excavation ac tivities in this area should be monitored and <br />observed c(intaminati(.)n stc)red ,cpar:att!ly for proper disposal. Also, further <br />samples from the seeps should be collected to fully define and evaluate thc� <br />impact to Coal Creek, One possible concern during excavation in this area is that <br />once the, excavation reaches- the depth of the water table, pressure differences <br />may alter ground water flaw causing contamination to migrate toward the <br />channel. <br />If you have questions concerning; comments in this letter or have questions <br />concerning recent drilling activities at the site, feel free to contact me at ('r[l;3) 866. <br />355'1. <br />Sincere y, <br />CA '1'y Ortiz <br />0 <br />