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GE " c <br /> GENESIS ENGINEERING&REDEVELOPMENT <br /> 2.3.3 Sonic Drilling <br /> Sonic drilling will be used to advance the five deep boreholes for collection of soil and <br /> groundwater samples. The 4000 RS Sonic drill rig is equipped with a sonic vibratory drill <br /> head that imparts high frequency sinusoidal wave vibrations into a drill string to effectuate a <br /> cutting action at the bit face. This drill head combines rotation with high-frequency vibration <br /> to advance the drill pipe. Sonic vibrations are transmitted down the drill pipe to the drill bit <br /> causing surrounding soil particles to fluidize, allowing for penetration. Core sampling is <br /> accomplished ahead of the outer casing. <br /> Upon reaching the selected depth intervals for collection of soil or groundwater samples, the <br /> outer drill pipe is then advanced outside the core barrel to keep the borehole open. Prior to <br /> each core sample run, the 6" 8" or 10" outer casing is sealed off, preventing cross- <br /> contamination and formation mixing. The core barrel is then removed from the borehole, <br /> and the soil sample is extracted into a plastic sleeve. <br /> In-situ groundwater samples are collected in discrete zones with a Simulproble®, <br /> HydroPuncho, or other direct push groundwater sampling equipment via the insertion of a <br /> drill rod to the bottom of the borehole. The direct push down-hole sampling equipment shall <br /> consist of a well point and screen attached to the bottom of hollow rods. The well probe <br /> shall be set at the bottom of the borehole and pushed into undisturbed soil. The hollow rod is <br /> then retracted approximately 18 inches to expose the well screen. Using a stainless steel or <br /> disposable bailer, the groundwater samples will be removed from the well screen and <br /> decanted into the laboratory supplied sample containers. After collection of the groundwater <br /> sample, the sampling equipment shall be removed from the borehole and the drill bit and rods <br /> re-inserted in the borehole. The borehole shall then be advanced to the next selected depth <br /> interval and the next groundwater sample shall be collected using the same sampling ro <br /> procedure discussed above. t S ( <br /> The soil core generated during boring advancement and well construction will be logged and <br /> subsequently placed in U.S. DOT approved 55-gal drums pending off-site disposal. Waste <br /> disposal procedures are presented in Section 2.5. <br /> 2.3.4 Monitoring Well Installation <br /> The monitoring wells will be constructed of 2-inch diameter, schedule 40,poly vinyl chloride <br /> casing, and machine slotted 0.010-inch screen(or other suitable size depending on the results <br /> of the sieve analyses) at the bottom. Ten-foot long well screens will be installed at the <br /> approximate depth interval of 30 feet to 40 feet below grade. The annular space around the <br /> well screen will be backfilled with clean, Monterey sand by placing the sand through the <br /> augers as they are removed from the boring. The well will then be surged to settle the sand <br /> Ripon Farm Services,Inc. 4 of 15 <br /> Sampling and Analysis Plan <br /> July 2009 <br />