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28 January 2004 <br /> . AGE-NC Project No 97-0230 <br /> Page 3 of 8 <br />' 2 13 Grab Ground Water Sample Collection and Analysis <br /> Saturated soil was encountered in boring P-9 at a depth of approximately 60 feet bsg, utilizing a <br />' hydro-punch ground water sampling tool, a grab ground water sample was collected at between 65 <br /> feet and 68 feet bsg The hydro-punch sampling assembly was attached to hollow steel rods and <br /> lowered through the hollow stem augers to total depth (65 feet bsg), then the hydro-punch was <br />' pushed down below total depth an additional 3 feet utilizing the CME-75 drill ng hydraulic system <br /> Subsequently, by retracting the hydro-punch assembly upward approximately three feet, a steel <br /> screen section within the assembly was exposed to ground water,and a V2-inch outer diameter(O D ) <br />' stainless steel bailer was lowered and utilized to extract a grab ground water sample Sufficient <br /> sample was collected from boring P-9 to fill three 40-m1 EPA-approved VOA vials containing 0 5 ml <br /> 18% hydrochloric acid as a preservative and one 1-liter amber bottle without sample preservative <br />' The grab ground water sample containers were labeled with the boring designation, date,time, and <br /> samplers initials <br />' Following grab ground water sample collection, the preserved sample was logged on a chain-of- <br /> custody form,placed in a chilled container and transported to a DHS-certified laboratory for analysis <br /> . for the same petroleum-hydrocarbon contaminants listed in the above Section 2 1 1 <br />' 2 14 Equipment Decontamination and Boring Abandonment <br /> Prior to soil or grab ground water sample collection, all soil and ground water sampling equipment <br />' was thoroughly rinsed with clean water after washing with a solution of Alconox Hollow stem <br /> augers or rods were pressure washed prior to soil boring advancement <br />' Upon soil sample/grab ground water sample completion, each borehole was filled to the ground <br /> surface with a cement grout mixture, which was poured down-hole through a tremmie pipe The <br /> grout mixture consisted of Type IM portland neat cement and not more than 6 gallons of water per <br />' 94-pound sack of cement <br />' 3.0. FINDINGS <br /> Soil descriptions and analytical results were utilized to develop cross sections A-A ' and B-B' <br />' (Figures 3 and 4, respectively) Laboratory analysis of twenty-three soil samples detected TPH-mo <br /> and benzene in two soil samples, total lead on one soil sample and MTBE in three soil samples <br /> Laboratory analysis of one grab ground water sample detected TPH-d, TPH-mo, benzene, MTBE <br />' and 1,2-DCA compounds <br />' Advanced GeoEnvironmental,Inc <br />