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I <br /> s r i <br /> 10 March 2000 1 , <br /> AGE-NC Project No 97-0312 <br /> I Page 2 of 6 j <br /> L 1 f <br /> A — 7 <br /> 2 2 ' COLLECTION OF GROUND WATER SAMPLES <br /> Water samples-were retneved from each purged well using new disposable bailers Each sample was <br /> transferred into 40-rinl EPA-approved VOA vials containing 0 5 ml of 18% hydrochloric acid as a` <br /> I sample preservative and into 1-liter amber bottles without preservative The samples were labeled, <br /> placed in a chilled container and transported under chain-of-custody to McCampbell Analytical Inc <br /> (MAI)in Pacheco,a California Department of Health Services (DHS)-certified analytical laboratory <br /> The samples,were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH,g) and diesel (TPH-d) in <br /> accordance with EPA Methods 5030 and 8015m, <br /> • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> I , with methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 8020/602, and <br /> • Volatile organics with fuel oxygenates (MTBE, di-isopropyl ether [DIPE], ethyl tert-butyl <br /> Iether [ETBE], tert-amyl methyl ether [TAME] and tert-butanol [TBA]) in accordance with <br /> EPA Method 8260 modified <br /> 1 <br /> 23 MASS OF HYDROCARBONS REMOVED <br /> During removal of the USTs from the site in September 1997, approximately 400 cubic yards of soil <br /> were excavated and stockpiled on-site Soil samples were collected from the stockpile for <br /> characterization The stockpile was segregated, based upon results of the samples In March 1998, - <br /> 241 tons of soil (approximately 180 cubic yards)were transported to Forward, Inc for disposal The <br /> calculated average concentration of hydrocarbons in the transported soil`was based upon the TPH <br /> concentrations in the seven soil samples collected from the selected portions of the stockpile The <br /> mass of�gasohne and diesel removed was then calculated The remaining 220 cubic yards of <br /> stockpiled soil was used to backfill the upper portion of the excavation <br /> C ' <br /> 2 4 MODELING OF REMAINING HYDROCARBON-IMPACTED`SOIL <br /> To assess the current potential for vadose zone absorbed petroleum hydrocarbons to impact ground <br /> water and sensitive receptors, AGE modeled site conditions and performed computer analyses of the <br /> likelyhood of such impacts aF <br /> Advanced GeoEnvironmental,Inc <br /> r <br />