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1 r However, surface water from sources outside the creek which contact the ' alluvium in passage to the creek may have an effect on alluvial water. C VI. QUALITY ASSURANCE One duplicate sample was collected during 1990 for laboratory quality assurance purposes. The duplicate sample was taken at ground water monitoring well TR-4 in May (sample date in Appendix II with an • indicates a duplicate ' sample). Results of the duplicate analyses were favorable for most of the parameters tested. The duplicate sample showed eight of nine parameters to be t within an acceptable range of the original values obtained. As previous discussed, the TR-4 sample results for bicarbonate did not agree. The duplicate value of 106 mg/1 is more consistent with historical values. The L quality assurance program will be continued during the 1991 report period. VII, SPRING AND SEEP SURVEY 1 A survey was conducted on May 9, 1990 to located springs and seeps which may be developing at the base of the ridge along Trout Creek from the north Moffat boundary to the base of West Ridge. A total of 10 springs and 18 seeps were located as a result of the survey (see enclosed map). Only one spring had sufficient flow to be of interest. That spring is currently monitored on a regular basis and is designated as NPDES discharge point No. 006. VIII. M06'SAT STABILITY ' Four wells were installed in 1984 to monitor the ground water levels over time. Elevations of the water in the Moffat wells are shown in Figure 16 with ' the data contained in Appendix II. Water levels in the Moffat area have stabilized over the previous years. The data suggests that groundwater levels are stable with recharge approximating discharge. Continued monitoring of the ' existing wells and the installation of spoil wells will provide additional information concerning the site stability. t 1