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Technical Memo - SII,V-EX Spill Monitoringport Paee 3 <br />2.0 METHODOLOGY <br />Water quality samples were collected in Lower Dry Fork and Minnesota Creek on December 2, 2005. <br />HydroGeo's Principal hydrogeologist and a field technician collected the samples, mapped site <br />locations, and described the characteristics ofthe stream including width and the average flow depth. <br />A hand-held Garmin eTrex global positioning system (GPS) device was used to record the locations <br />of the sample collection sites. Fourteen sample collection sites were identified approximately one-half <br />mile apart, beginning at the Lower Dry Fork Flume and continuing downstream along Minnesota <br />Creek to Apple Valley Park in Paonia (Figure 1). Site coordinates were recorded in a field data book <br />using UTM, NAD 83, true North units and are summarized in Table 1 (Appendix A). Digital photos <br />of each collection sample collection site aze presented in Appendix A. Field parameters including pH, <br />electrical conductivity (EC), and temperature (°F) were measured using a Hydac water quality meter, <br />recorded in a field data book, and summarized in Table 1 (Appendix A). Water samples were <br />collected in accordance with standard EPA protocols. Samples were collected in a graduated <br />measuring cup which was drained to fill the glass sample bottles provided by Enviro-Chem <br />Analytical, Inc. Water was added to the sample bottle until there was no head space and then capped. <br />Samples were stored in a cooler with ice until they were delivered to the laboratory. Duplicate <br />samples were collected at each site to ensure an adequate amount of volume was available for analysis <br />and for duplicate lab analyses. Sample bottles were labeled as sample MC-1 through MC-14, A or B. <br />The stream bed width, average flow depth, field water quality, and GPS data were recorded in the <br />field data book and are summarized in Appendix A. Samples were hand delivered to Liese Thompson <br />of Enviro-Chem Analytical, Inc. on the afternoon of December 2, 2005. The laboratory analysis was <br />conducted by Enviro-Chem Analytical, Inc located in Grand Junction, Colorado on December 4 and <br />5, 2005. The samples were analyzed for total volatiles (including Butyl Carbitol and Ethanol), <br />ammonia, sodium, and pH, the primary chemical constituents of SILV-EX. <br />2.1 Results of the Laboratory Analysis <br />The laboratory results indicate there were no volatile compounds in any of the 14 water samples <br />(Appendix B). Lab results indicate the presence of a very low concentration of ammonia in the water <br />from Dry Fork (MC-1 and MC-2) and the upper portion of Minnesota Creek (MC-4 and MC-5, one <br />mile below the Dry Fork confluence). However, it should be noted that ammonia was also present in <br />the sample from Minnesota Creek upstream of the confluence with Dry Fork (MC-3), a site not <br />impacted by the SILV-EX spill. This indicates that slight concentrations of ammonia (0.11 to 0.14 <br />