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t GeoLogic Associates <br /> Geologists, Hydrogeologists and Engineers <br /> April 21, 2006 <br /> JN: 2003-021 <br /> Mr. Ross Atkinson <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, CA 95670-6114 <br /> SUBJECT: FIRST QUARTER 2006 MONITORING REPORT <br /> FRENCH CAMP LANDFILL <br /> ' SAN JOAQUIN COUNTY, CALIFORNIA <br /> On behalf of Forward, Inc. (Forward), GeoLogic Associates is pleased to submit the first quarter <br /> 2006 Monitoring Report for the French Camp Landfill, in compliance with the California <br /> Regional Water Quality Control Board- Central Valley Region(RWQCB)Waste Discharge <br /> Requirement(WDR) Order Number R5-2004-0159. <br /> This report summarizes standard observations and presents the results of surface-water and <br /> groundwater monitoring during the first quarter 2006. A summary of analytical results and time- <br /> series concentration plots for field and monitoring parameters are also included in this report. A <br /> description of field procedures and sampling protocols followed by personnel conducting field <br /> monitoring activities is included in Appendix B of the report. <br /> Groundwater quality conditions beneath the French Camp Landfill during the first quarter 2006 <br /> monitoring period are generally similar to those observed in previous monitoring periods. <br /> During the first quarter 2006 monitoring period,one or more inorganic concentration limits <br /> (CLs) were exceeded in detection monitoring program(DMP)wells MW-8A, MW-9A, MW-9B; <br /> and MW-10A. In addition, organic constituent results indicate that a low-level concentration of <br /> 1,2-dichloroethane was measured in the sample collected from well MW-9B. With the exception <br /> of chloride and specific conductance concentrations measured in the sample collected from well <br /> MW-10A, no statistically significant increasing trends were noted for constituent concentrations <br /> exceeding a CL. Previous statistical exceedances for chloride and TDS have been identified in <br /> samples from well MW-l0A and a No Release Demonstration(NRD)for groundwater <br /> monitoring well MW-l0A was performed(Herst,2005). The NRD concluded that French Camp <br /> Landfill, located within the central Stockton area,has been impacted by saltwater intrusion and <br /> the elevated chloride and TDS concentrations measured in well MW-l0A are believed,to be the <br /> result of this condition and not the result of landfill-related impacts. Since specific conductance <br /> and TDS values often mimic each other, the specific conductance exceedance is believed to the <br /> result of this same condition. <br /> 250 W. First Street, Suite 228, Claremont, California 91711 Phone: (909) 626-2282 FAX: (909) 626-1233 <br />