ARCHIVED REPORTS_2016_2 - Laserfiche WebLink

Home Browse Search

Water Quality Monitoring Report Forward Landfill 2.0 FORWARD UNIT 2.1 Water Quality Monitoring 2.1.1 Sampling and Laboratory Analyses During the second quarter 2016, Del-Tech Geotechnical Support Services (Del-Tech) measured depth-to-water (DTW) from all Forward Unit wells on May 16, 2016; samples were collected from all Forward Unit wells, including domestic well DW-9690, between May 17 and 19, 2016; and suction lysimeter LY-BG-1 was sampled on June 14, 2016; Of note, surface water monitoring stations were dry on multiple occasions during the monitoring period. Samples were collected by Del-Tech from each sample point containing sufficient liquid and submitted to BC Laboratories (BC) of Bakersfield, California, a state certified laboratory under contract to Forward. The second quarter 2016 samples were analyzed for the routine monitoring parameters stipulated in RWQCB Order No. 115-2014-0006. Table 2-1 summarizes site monitoring parameters, analytical methods, and monitoring frequency. Water quality samples were also analyzed in the field for oxygen reduction potential (ORP), turbidity, temperature, specific conductance, and pH and recorded on well data sheets. The groundwater monitoring wells and leachate monitoring points were sampled in accordance with the sampling and analysis plan detailed in Appendix E. The well data sheets, raw laboratory data, certificates of analyses, and chain-of-custody records related to the sampling program are included in Appendix F. Field and laboratory analyses are summarized in Tables 2-2 through 2-7 and cumulative tabulated data for all monitoring points and constituents for groundwater, unsaturated zone, and leachate are presented in Appendix F. 2.1.2 QA/QC Results The quality assurance/quality control (QA/QC) program completed for the second quarter 2016 water quality monitoring event included analyses of two trip blanks, laboratory method blanks, and one duplicate sample (MW-3). The field and trip blanks were analyzed for VOCs by EPA Method 8260, and the method blanks were analyzed for all of the analytes included in the monitoring program. The results of the QA/QC program indicate that no VOCs were detected in any of the QA/QC blanks during the second quarter 2016 monitoring period. Of note, a quantifiable concentration of acetone was measured in the primary sample collected from MW-3 but not in the duplicate sample; given the fact that acetone is a common laboratory contaminant used for cleaning equipment and was found in a QA/QC method blank for the Austin Unit samples, acetone was flagged as a suspected field/laboratory contaminant. The results of the duplicate sample collected from well MW-3 yielded good correlation with a relative percent difference (RPD) six percent or less for quantifiable results. Review of the sampling dates and laboratory analytical certificates indicates that all laboratory M:\2016.0007\FA 2Q16.docx 5