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07 May 1998 <br /> AGE-NC Project No. 98-0448 <br /> Page 5 of 6 <br /> intrinsic permeability,moisture content,porosity and total organic carbon in accordance with <br /> the appropriate EPA/ASTM methods. <br /> 11. Convert each 8.25-inch soil boring into a ground water monitoring well as depicted in Figure <br /> 3; convert each 12-inch soil boring into a dual-completed ground water monitoring well as <br /> depicted in Figure 4. <br /> 12. Use a surge block or bailer during the construction of ground water wells to set the sand filter <br /> material, prior to installation of the bentonite sanitary seal. <br /> 13. Store cuttings in properly labeled D.O.T.-approved, model 17H 55-gallon drums on-site <br /> pending laboratory analysis and disposal. <br /> 14. Containerize rinseate generated during drilling activities in properly labeled D.O.T.- <br /> approved, model 17H 55-gallon drums, and store on-site in an area lacking access for the <br /> general public. <br /> 4.2. MONITORING WELL DEVELOPMENT, SURVEY AND SAMPLING <br /> 1. Survey the top of each well casing to the nearest 1/100th of a foot to determine the elevation <br /> relative to a City of Stockton benchmark. Surveying will be performed by a licensed <br /> surveyor. <br /> 2. No sooner than 48-hours after completion, each new well will be developed using a <br /> submersible pump. Each new well will be surged and purged until ground water appears to <br /> be sediment free. <br /> 3. Measure ground water depth in each well at the site to the nearest 0.01-foot using a Solinst <br /> water level meter. <br /> 4. After development, at least three well volumes of water will be removed from all wells. <br /> Temperature, pH, and conductivity will be measured at regular purge-volume intervals to <br /> monitor stabilities of the ground water parameters; stabilization parameters will be recorded <br /> on field sheets. <br /> 5. Ground water samples will be retrieved using disposable plastic bailers and transferred into <br /> 40-m1 VOA vials and 1-liter amber bottles. <br /> 6. The samples will be stored in a chilled container and transported under chain-of-custody to <br /> a state-certified laboratory for analysis. Ground water samples will be analyzed for TPH-g, <br /> BTE&X and oxygenated compounds in accordance with EPA methods 5030/8015m, <br /> 8020/602 and 8260. <br /> 7. Store purged water in 55-gallon DOT drums on-site pending analytical results. <br /> Advanced CcoEnvironmental,Inc. <br />