ARCHIVED REPORTS_2012 - Laserfiche WebLink

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® Monitoring Wells Constituent MW-6 MW-5 MW-4 (Newly installed (Newly installed (downgradient) upgradient) South of ponds North of MW-4) EC (us/cm) 1,011 1,061 854.8 Calcium (mg/L) 22 94 55 Magnesium (mg/L) 9.8 52 29 Alkalinity (as CaCO3, 100 390 140 mg/L) Hardness (as CaCO3, 94 450 260 mg/L) Surface Water Surface water samples were collected December 27, 2012 (Table 4). Samples are taken if sufficient water is flowing at sampling points during the wet season. The dry climate at this site makes collection of surface water difficult. All concentrations of field parameters and ® constituents of concern were below established concentration limits where the limits could be determined. Storm Water There were no storm water discharges to the waters of the State during this reporting period. Such discharge requires the manual operation of the pumps in the retention basin to pump into the drainage ditch. Landfill Gas The Monitoring and Reporting program for the landfill requires semi-annual VOC testing by TO-15 analysis. Soil gas samples were collected on August 7, 2012, and is included in this second semester report. Soil gas samples were collected in 1-liter Summa canisters and sent for VOC analysis by EPA method TO-15. The concentrations of major gasses were recorded during the TO-15 sampling event, and a sample was collected from the probe most likely to have the highest VOC concentration. Methane concentrations were zero in all perimeter migration monitoring wells during the third quarter monitoring event with the exception of the East Header and West Header. VOCs were detected in all four soil gas well probes during this third quarter monitoring event. The highest VOC concentration was found in the West Header of the landfill gas system. Harney Lane Sanitary Landfill 8 Department of Public Works/Solid Waste 2nd Semester and Annual 2012 Groundwater Monitoring Report County of San Joaquin—January 25,2013