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regarding the depth to ground water and presence of free product, if any. Field procedures are <br /> described in Appendix A. <br /> 4.5 GROUND WATER SAMPLING <br /> Ground water sampling will be conducted on a quarterly basis. Written notification of proposed <br /> ground water sampling dates will be provided by fax to the PHS/EHD approximately 48 hours <br /> prior to sampling. Ground water samples will be collected, in accordance with EPA protocol, <br /> i <br /> from monitoring wells which do not contain free product. <br /> Ground water samples will be analyzed for the following: <br /> • TPH-G and TPH-D using EPA method 8015 modified for gasoline and diesel; and <br /> BTEX using EPA Method 8020. <br /> All laboratory analyses will be performed by a state-certified laboratory. Chain of Custody <br /> Protocol will be followed for all samples selected for analysis, thus providing a continuous record <br /> of sample possession prior to actual analysis. <br /> 4.6 SOIL AND GROUND WATER DISPOSAL <br /> Soil generated during drilling activities will be stock piled onsite on and covered by plastic <br /> sheeting pending disposal at a Mobil approved disposal facility. Purged ground water will be <br /> stored onsite in DOT drums and later transported to an approved disposal/recycling facility. <br /> Waste manifests will be prepared for proper transport and disposal. <br /> 4.7 PILOT STUDY FOR ENHANCED BIODEGRADATION OF RESIDUAL <br /> HYDROCARBONS <br /> The purpose of this pilot study is to evaluate the feasibility of enhancing biodegradation of <br /> hydrocarbon-affected soil and ground water using an oxygen-releasing compound (ORC). Under <br /> the right chemical conditions, the introduction of an ORC to hydrocarbon-affected ground water <br /> can stimulate the growth of indigenous microbes and accelerate their metabolism of petroleum <br /> hydrocarbons. Metabolism of adsorbed-phase hydrocarbons present below the static ground <br /> water level may also benefit from the oxygen enhancement process and result in hydrocarbon <br /> concentration reduction. This process is dependent on various factors including the presence of <br /> an appropriate microbial population, proper nitrate, phosphate, pH, and dissolved oxygen <br /> concentrations. <br /> Ground water monitoring wells AW-3 and AW-9 will be used as treatment feasibility evaluation <br /> points. Baseline measurements of water samples from these two wells will be conducted for the <br /> following components: TPH-G, TPH-D, BTEX, nutrients (ammonia, nitrates, nitrites, <br /> phosphates), microbial enumeration (type and population), pH, and dissolved oxygen. A <br /> • 5 <br />