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<br />M <br />W <br />~ <br />u <br />c <br />C~ Report. Post construction activities will consist of detailed data collection, <br /> <br />with monthly updates of the water and salt budgets. <br /> <br />The second method of monitoring will be indicators which will show early <br /> <br />changes in the system. The main indicators such as change" in the hydrographs <br /> <br />of selected observation wells, drain flows, areal extent of surface seeps, and <br /> <br />a possible change in phreatophytic growth, are expected to demonstrate a change <br /> <br />in ground-water return flow. A basic assumption for construction of Water <br /> <br />Systems Improvements is that decreased canal and lateral s.~epage will also <br /> <br />decrease salt loading to the Colorado River. The indicato:rs should show a <br /> <br />change in the ground-water volume. <br /> <br />The post construction monitoring methods will be fund.3mentally the same as <br /> <br />the preproject methods. The present monitoring system will be supplemented to <br /> <br />obtain data more efficiently and to use improved measurement capabilities <br /> <br />available after construction. The frequency of data collec:tion will be <br /> <br />evaluated periodically and adjusted as necessary. Preproj,.ct monitoring has <br /> <br />consisted of a periodic quantity and quality sampling program and studies of <br /> <br />particular parameters such as seepage and d~ep percolation. The following <br /> <br />pages describe the preproject monitoring techniques and explain the proposed <br /> <br />modifications which will be employed for additional monito:ring. <br /> <br />Monitoring of Periodic Data <br /> <br />Hydrologic and salinity data, although not available for the Stage One <br /> <br />area, are available for the area drained by Reed Wash and Peck and Beede Wash, <br /> <br />which includes most of the Stage One area. This area, kno,,,,, as the Reed Wash <br /> <br />study area, is a closed, hydrologically isolated basin where ground and <br /> <br />surfacewater measurements are made; the relationship betwe,.n Reed Wash study <br /> <br />area and the Stage One area is shown on the location Map #1295'"417-807, page 44. <br /> <br />2 <br />