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NOA Drywell Closure and Investigation Work Plan Page 9 of 16 <br /> March 18, 2014 <br /> Revised March 20, 2014 <br /> A 24-inch long core barrel fitted with four (4) six-inch long clean stainless steel sleeves will be <br /> forced into the undisturbed soil one (1) to two (2) feet below the bottom of the drywells (50 <br /> feet bgs). The core barrel will be retrieved and sampling sleeves will be removed and placed on <br /> clean plastic. The borehole will be logged using cuttings or the coring by a Geologist in <br /> accordance with the Unified Soil Classification System. The sampling sleeve ends will then be <br /> covered with Teflon sheets and plastic end caps and secured with silicone-based tape. Sample <br /> end caps will be labeled appropriately. Sealed and labeled samples will then be placed in cooled <br /> ' ice chests for transportation to the analytical laboratory. <br /> 4.4 Equipment Decontamination <br /> ' All sampling equipment will be decontaminated before and after each sampling event. All <br /> sampling equipment will be disassembled, washed in a solution of Liqui-Nox detergent or <br /> equivalent and tap water, rinsed with tap water, rinsed with isopropyl alcohol, triple rinsed with <br /> distilled water, rinsed with acid, and lastly rinsed with certified organic free water. <br /> Cleaning will be conducted in such a manner so as to contain the water, which will be placed in <br /> appropriate containment vessels, labeled, sealed, and stored prior to disposal. Disposal <br /> methodologies will be contingent upon field observations and/or analytical results. <br /> ' 4.5 Sample Analysis <br /> 4.5.1 Groundwater <br /> ' Six (6) groundwater samples will be collected from each of the two (2) drywells. Each <br /> groundwater sample will be analyzed for a separate constituent, including the 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 8440 <br /> One (1) groundwater sample will be collected and split between two identical containers to <br /> fulfill the Replicate Samples Quality Control/Quality Assurance requirement (See Section 4.6). <br /> Both containers will be analyzed for the following: <br /> RCRA Metals by EPA Method 6010 <br /> In addition, the pH of the groundwater in each drywell will be measured in the field by a <br /> Geologist or Engineer using a handheld pH meter. <br /> All analyses will be provided by McCampbell Analytical in Pittsburg, California. <br /> 902 Industrial Way•Lodi,CA 95240-209.367.3701 •Fax 209.369.4228 02014 Neil O.Anderson&Associates,Inc <br />