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NOA Drywell Closure and Investigation Page 14 of 26 <br /> May 30, 2014 <br /> 5.0 SAMPLING RESULTS AND DISCUSSION <br /> 5.1 Analytical Methods <br /> All analyses were provided by McCampbell Analytical, Inc. in Pittsburg, California. <br /> 5.1.1 Groundwater <br /> A total of fourteen (14) groundwater samples were collected for laboratory analysis. Six (6) <br /> groundwater samples were collected from each of the two (2) drywells. Each groundwater <br /> sample was analyzed for a separate constituent, for a total of two (2) groundwater samples <br /> analyzed for each of the following constituents: <br /> • Volatile Organics by EPA Method 8260 <br /> • Semi-Volatile Organics by EPA Method 8270 <br /> • RCRA Metals by EPA Method 6010 <br /> • Total Petroleum Hydrocarbons as Gasoline by EPA Method 8015 <br /> • Total Petroleum Hydrocarbons as Diesel by EPA Method 8015 <br /> • Total Recoverable Petroleum Hydrocarbons by EPA Method 418.1 <br /> In addition, one (1) groundwater sample was collected from DW-2 and split between two <br /> identical containers to fulfill the Replicate Samples Quality Control/Quality Assurance <br /> requirement (See Section 4.5). Both containers were analyzed for the following: <br /> • RCRA Metals by EPA Method 6010 <br /> The pH, temperature, Total Dissolved Solids, Electrical Conductivity, and Dissolved Oxygen of <br /> the groundwater in each drywell was measured in the field by a Geologist using a Horiba U-53 <br /> Multiparameter Meter. <br /> 5.1.2 Soil <br /> A total of thirteen (13) soil samples were collected for laboratory analysis. Six (6) soil samples <br /> collected from DW-1 and three (3) soil samples collected from DW-2 were each analyzed for the <br /> following: <br /> • Volatile Organics by EPA Method 8260. <br /> • Semi-Volatile Organics by EPA Method 8270 <br /> • RCRA Metals by EPA Method 6010 <br /> • Total Petroleum Hydrocarbons as Gasoline by EPA Method 8015 <br /> • Total Petroleum Hydrocarbons as Diesel by EPA Method 8015 <br /> • Total Recoverable Petroleum Hydrocarbons by EPA Method 418.1 <br /> Two (2) soil samples, one (1) from each drywell, were additionally analyzed for the above listed <br /> constituents using the Toxicity Characteristic Leaching Procedure (EPA Method 1311) for <br /> extraction. <br /> 902 Industrial Way• Lodi, CA 95240•209.367.3701 • Fax 209.333.8303 ®2014 Neil O.Anderson It Associates,Inc. <br />