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Stormwater Pollution Prevention Plan will identifythe " <br /> Corral Hollow Landfill as a"non- <br /> discharge" site, after which upstream and downstream samples will no longer be taken from the <br /> Corral Hollow Creek. <br /> Surface water samples are analyzed semi-annually for the following field and monitoring <br /> parameters in accordance with the WDRs: <br /> Temperature Carbonate <br /> Electrical Conductivity Bicarbonate <br /> pH Calcium <br /> Turbidity Magnesium <br /> Total Dissolved Solids Potassium <br /> Chloride Sodium <br /> Sulfate Volatile Organic Compounds <br /> Nitrate-nitrogen <br /> Surface water samples are analyzed every five 5 years in accordance with the WDRs for the <br /> following COCs: <br /> Total Organic Carbon Semi-Volatile Organic Compounds <br /> Inorganics(dissolved) Chlorophenoxy Herbicides <br /> Volatile Organic Compounds(extended list) Organophosphorus Compounds <br /> Surface water COC samples were last collected on April 15, 2010. The next COC surface water <br /> monitoring event is scheduled for the first quarter of 2015. <br /> Saturated (Vadose) Zone Soil Pore Gas <br /> In accordance with the WDRs and the Monitoring and Reporting program for the site, soil gas <br /> wells GW-1 through GW-7 are monitored for methane, oxygen, carbon dioxide, and VOCs (EPA <br /> Method TO-15) quarterly. In August 2013 two additional soil gas wells (GW-8 and GW-9) were <br /> installed. <br /> Starting in June of 2006, samples for VOC analysis have been collected from one probe at each <br /> well. At wells in which methane was detected,the VOC sample was collected from the probe <br /> with the highest methane content. Where no gas is detected,the VOC sample is collected from the <br /> deepest probe unless the sampling technician determined that there might be an obstruction to the <br /> probe, in which case a sample is collected from the next higher probe. Sampling has continued <br /> from those probes that were originally selected in 2006. <br /> Statistical Analysis of Groundwater Samples <br /> At the CHSL,the County has been approved to use the intrawell tolerance limit method(each well <br /> provides its own background data) for groundwater analysis, and to use the interwell tolerance <br /> limit method for surface water analysis. Concentration limits are updated quarterly, and were <br /> Corral Hollow Sanitary Landfill 11 Department of Public Works/Solid Waste <br /> 2"d Quarter 2014 Groundwater Monitoring County of San Joaquin—July 15,2014 <br />