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03 April 2000 <br /> AGE-NC Project No 98-0511 <br /> Page 2 of 6 <br /> probe boring Three soil probe borings were advanced southwest, south, and southeast of EW-1 to <br /> total depths of 25 feet bsg One soil probe boring was advanced adjacent to EW-1 to 50 feet bsg to <br /> determine the vertical extent of hydrocarbon-impacted soil <br /> Soil probe borings were advanced using a van-mounted Geoprobe 5400 direct-push probing unit <br /> equipped with 1 25-inch probing rods The Geoprobe advances soil probe borings using a hydraulic <br /> hammer to drive soil and ground water sampling tools to specified depths Field procedures for <br /> advancement of probe borings and collection of soil samples were presented in Additional Site <br /> Assessment Work Plan <br /> 3 2 SOIL AND GRAB GROUND WATER SAMPLE COLLECTION <br /> Discrete soil samples were collected using the Geoprobe push-driven 2-inch sampler fitted with four <br /> six-inch long brass sleeves at 5-foot intervals, beginning at 5 feet bsg, from all soil borings Soil <br /> samples were preserved by covering both ends of the second brass sleeve with Teflon sheets,capping <br /> and sealing with tape Each preserved sample sleeve was labeled with soil boring location, depth, <br /> time, date and sampler's initials and was stored in a chilled container under ice Selected soil <br /> samples were logged-on a chain-of-custody, transported to AIpha Analytical Laboratories Inc of <br /> Ukiah, California, a State of California Department of Health Services (DHS)-certified laboratory, <br /> and were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 5030/8015M, <br /> • Volatile aromatics benzene,toluene, ethyl benzene and xylene (BTEX) in accordance with <br /> EPA Method 8020, and <br /> • Fuel oxygenates, including tertiary butanol(TBA), di-isopropyl ether(DIPS), ethyl tert-butyl <br /> ether (ETBE), tert-amyl methyl ether (TAME) and methyl tertiary-butyl ether (MTBE) in <br /> accordance with EPA Method 8260M <br /> Grab groundwater samples were collected from all probe borings Samples were collected utilizing <br /> a Geoprobe water sampling assembly fitted with a pre-cleaned one-inch diameter, 0 01-inch slotted <br /> temporary well screen Each ground water sample was extracted by lawenng a Teflon bailer through <br /> the hollow center of the push rods into the screen section Upon retrieval, each ground water sample <br /> was transferred into EPA-approved 40-m1 VOA vials, containing 0 5 ml 18% hydrochloric acid as <br /> a sample preservative <br /> Care was taken to ensure that visible air bubbles were not present in the VOA vials after filling and <br /> Advanced GcoEnNironmcntal,Inc <br />