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Beginning next season, the analysis of plant effluent should measure the <br /> concentration of fixed dissolved solids in preference to the present <br /> measurement of total dissolved solids. The fixed dissolved solids represent <br /> the inorganic fraction of the solids in solution. Since the inorganic <br /> constituents are of primary concern it is preferable to measure them directly. <br /> Existing shallow groundwater in the vicinity of QAP has moderately elevated <br /> nitrate and salinity levels as a result of decades of irrigated agriculture. <br /> Locally the shallow groundwater salinity will be only slightly affected by QAP <br /> wastewater disposal operations. As the combined flow of percolate and <br /> groundwater move down gradient further dilution will occur. It appears that <br /> the aquifer in the Laguna formation tapped by most domestic wells is <br /> sufficiently isolated from the shallow groundwater to maintain its relatively <br /> high quality. This isolation is maintained locally by a stratum of low <br /> hydraulic conductivity which exists in the region between 50 and 150 ft below <br /> ground surface. Therefore, QAP wastewater disposal operations should have no <br /> significant effect on the quality of water from domestic wells in the area. <br /> Groundwater quality monitoring programs should be maintained. Analysis of <br /> water quality in the domestic well monitoring program can be made on an annual <br /> basis as it is unnecessary to sample domestic wells with the present frequency. <br /> 1-14 <br /> RP033-L <br />