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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 January 30, 2013, and is included in this first 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 first, 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 first quarter monitoring event. The highest VOC concentration was found in the West Header of the landfill gas system. Concentrations of major gasses (Methane, Carbon Dioxide, and Oxygen) and pressure were measured using a CES-LANDTEC GEMTm2000 portable gas detector on January 30, 2013. GROUNDWATER DIRECTION AND FLOW RATE The general direction of groundwater flow, determined from the elevations of water in the groundwater wells, is to the south, and was consistent between quarters (Figure 2 and 3). Groundwater flow velocity was calculated to be about 79.21 feet per year with a gradient of 0.00235 foot per year during the first quarter 2013. Groundwater flow velocity was calculated to ® be approximately 74.81 feet per year with a gradient of 0.00222 foot per year during the second quarter 2013. (Appendix F). STANDARD OBSERVATIONS The site was inspected monthly throughout the monitoring period (Appendix G). The information on the original field form was transcribed for legibility. The original forms with signatures can be forwarded upon request. RUN-OFF/RUN-ON FACILITIES General The HLSL utilizes a single facility to control run-off and run-on: a perimeter berm/road surrounding the site, which generally prevents any water from entering the site. Water drains from the landfill property to the retention pond. A discharge to the Waters of the State occurs when water is discharged from the retention pond. No water was discharged at any time during the first semester 2013. The discharge pumps are not active unless manually activated by Solid Waste staff. Harney Lane Sanitary Landfill 9 Department of Public Works/Solid Waste 1 n Semester 2013 Groundwater Monitoring Report County of San Joaquin—July 15,2013