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Surface Water <br /> Surface water samples were last retrieved on February 11, 2007. All concentrations of monitoring <br /> and field parameters were below established concentration limits where the limits could be <br /> determined. Due to a lack of water, surface water samples were not collected during the first or <br /> second semester 2008 sampling events. <br /> HISTORICAL TIME SERIES PLOTS AND STIFF DIAGRAMS <br /> Constituents not detected are plotted at a value of half their respective detection limits in the <br /> Historical Time Series Plots (Appendix F). Outliers were included in the plots as directed by <br /> RWQCB staff. <br /> Stiff diagrams are submitted annually with the second semester and annual report. The stiff <br /> diagrams submitted for the first and second semesters indicate a calcium-bicarbonate water type <br /> since these ions have the highest concentrations in the six wells (Appendix F). The water type is <br /> similar in all wells as indicated by similarity in concentrations of the various constituents and the <br /> similarity in diagram shapes. This similarity indicates that the groundwater is not impacted as it <br /> moves under the landfill. The shapes of the diagrams between the first and second semesters are <br /> also very similar indicating that the general groundwater quality has not changed throughout the <br /> year, which is also an indication of no impact from the landfill. <br /> Foothill Sanitary Landfill 12 PDepartment of Public Works/Solid Waste <br /> 2nd Semester and Annual 2008 Groundwater Monitoring County of San Joaquin—January 31,2009 <br />