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HISTORICAL TIME SERIES PLOTS AND STIFF DIAGRAMS <br /> Constituents not detected are plotted at a value of half their respective detection limits in the Historical Time <br /> Series Plots (Appendix F). Outliers were included in the plots as directed by RWQCB staff. <br /> Stiff diagrams are submitted annually with the second semester and annual report. The stiff diagrams <br /> submitted for the first and second semesters indicate a calcium-bicarbonate water type since these ions have <br /> the highest concentrations in the four wells (Appendix F). The water type is similar in all wells as indicated <br /> by similarity in concentrations of the various constituents and the similarity in diagram shapes. This <br /> similarity indicates that the groundwater is not impacted as it moves under the landfill. The shapes of the <br /> diagrams between the first and second semesters are also very similar indicating that the general groundwater <br /> quality has not changed throughout the year, which is also an indication of no impact from the landfill. <br /> Foothill Sanitary Landfill 13 Department of Public Works/Solid Waste <br /> 2nd Semester and Annual 2007 Groundwater Monitoring County of San Joaquin—January 31,2008 <br />