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<br />I ~Ionitoring <br />I <br /> <br />I Data Analysis <br /> <br />I <br /> <br />-- <br /> <br />Results <br /> <br />- <br /> <br />--- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />USGS collected and analyzed samples biweekly at 5 sites starting June 1998. Pre -1998 data were <br />available allbe out-flow site (MA2) for lotal dIssolved solids (IDS) and Selenium. <br /> <br />- - ---- <br /> <br /> <br />For each site, data were separated mto Pre-Project and Post-Projett periods. All data through March <br />1999 were considered .Pre-Project." Salt and selenium loads were computed. and loads between <br />tbe two periods at each site wefe compared. <br /> <br />Basellow (November-March) Selenium Concentrations <br /> <br />x <br />o <br />::; <br />=! <br />~ <br />~ <br />~ <br />- <br />~ <br />~ <br />~ <br />< <br />- <br />'" <br />" <br />2 <br />x <br />~ <br />~ <br />~ <br />~ <br /> <br />160 <br />t40 <br />120 <br />100 <br />80 <br />60 <br />40 <br />20 <br />o <br /> <br />. PRE-PROJECT <br />. POST-PROJECT <br /> <br /> <br />MM <br /> <br />D2MA <br /> <br />MA3 <br /> <br />DIMA <br /> <br />MA2 <br /> <br />-- --- - <br /> <br />- <br /> <br />- -- <br /> <br />- <br /> <br />- <br /> <br />Reduced ground-water recharge from imgation lateral leakage decreased the amount of water available <br />for the mobilization of salts and selenium Based on results through Octoher 2000, the piping of irriga- <br />tion laterals has reduced total salinity by an average of II % and selenium loads by an average of 27~.. <br /> <br />- <br /> <br />- <br /> <br />-- <br /> <br />- <br /> <br />-- <br /> <br />Abmal'l and llX"hnical report availabl~ al ht~)"f}....l~"D1 lrh9IJ"VIPntwh:irri~I-C~ Mm <br /> <br />IUSGS .- <br />-.:r..dIIfiIf'" <br /> <br />J> <br />'* COlORAOO~-.JfQ <br />-:::;""O--~DI$fRICl <br />(970) 945-8522 www crwcd org <br />