ARCHIVED REPORTS_2013 - Laserfiche WebLink

Home Browse Search

observations were conducted during the monitoring period. With the exception of a small cut in the front gate at the site which was subsequently repaired by Forward staff,no areas of concern were noted (see signed"Certification Statement"included in Appendix A). 3.0 SOLID WASTE MONITORING The French Camp Landfill has been formally closed and no longer receives waste. 4.0 WATER QUALITY MONITORING 4.1 SAMPLING AND LABORATORY ANALYSES All of the groundwater and leachate monitoring wells and surface water monitoring points were sampled on March 25 and 26, 2013. Quarterly depth-to-water and stream gauging were performed on March 25 and May 21, 2013. A single sample set was collected from each sampling point(groundwater, leachate, and surface water)and analyzed by BC Laboratories for the parameters stipulated in RWQCB Order No. R5-2007-0046, including the five-year COC list(Table 1). Water quality samples were also analyzed in the field for oxidation-reduction potential,turbidity, temperature, specific conductance, and pH and these field measurements were recorded on well data sheets. The groundwater and leachate monitoring wells and surface water monitoring points were sampled by Del-Tech Geotechnical Support Services(Del-Tech) in accordance with the sampling and analysis procedures detailed in Appendix B. Well data sheets,raw laboratory data, certificates of analyses, and chain-of-custody records for the sampling program are included in Appendix C. The laboratory analyses and field results for groundwater wells and surface water sampling stations are summarized in Tables 2 through 5. 4.2 QA/QC RESULTS The quality assurance/quality control (QA/QC)program completed for the monitoring event included analyses of one duplicate sample and laboratory method blanks. Laboratory method blanks are analyzed for all of the analytes included in the monitoring program. Trace concentrations of chloride, sodium, non-volatile organic carbon, arsenic, and selenium were measured in the laboratory method blank at generally very low, trace concentrations that did not affect the interpretation of primary sample results. However, due to similar concentrations measured in primary samples compared to blank samples, the following have been flagged as laboratory contaminants: arsenic at wells MW-2, MW-8A, MW-9A,MW-913, and surface water stations SW-1; and selenium at wells MW-6A, MW-9A, and MW-10A. A duplicate sample was collected from groundwater monitoring well MW-7A and was labeled Duplicate. Duplicate test results are presented along with the primary data in Table 2. Comparison of the primary and duplicate sample results, when both results are C:\2013.00231FC 1SA13.doc 2 Geo-Logic Associates