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A significantly increasing trend in Chloride was present for all four quarters of 2006. However, the <br /> concentration limit for Chloride was not exceeded in any quarter of 2006. The increasing trend in <br /> Chloride was investigated in 2005. The investigation began in the third quarter of 2005 and <br /> continued in the fourth quarter of 2005. The investigation involved comparing the concentrations of <br /> certain parameters in water samples from nearby water treatment ponds, from the up-gradient well <br /> MW-1, and from MW-4. After two quarters of testing, it was concluded that impact from <br /> L wastewater pond discharge to groundwater was occurring at MW-4 for Chloride, TDS, Potassium <br /> and E.C. However, Section E-4 of the Monitoring and Reporting Program exempts this well from <br /> Chloride, TDS, and EC as monitoring parameters. <br /> A decreasing trend in EC was reported in all four quarters in 2006, which indicates that groundwater <br /> quality is improving at MW-4. <br /> No VOCs were reported in MW-4 in 2006. <br /> Surface Water <br /> Surface water was sampled on January 3, 2006. All concentrations of quarterly monitoring and field <br /> parameters are below established concentration limits. Surface water sampling for the present storm <br /> season will be performed when surface water is available. <br /> HISTORICAL TISERIES PLOTS <br /> As required, historical time series plots are included(Appendix F). Note that constituents that are <br /> not detected are plotted at a value of half their respective detection limits. Outliers were included in <br /> all plots as directed by RWQCB staff. <br /> Harney Lane Sanitary Landfill Department of Public Works/Solid Waste <br /> e Quarter and Annual 2006 Groundwater Monitoring Report County of San Joaquin-January 15,2007 <br /> 8 <br />