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11 - <br /> 19 November 1999 ".. a.. <br /> I..� •T AGE-NC Pr_ojectNo. 98--0440 <br /> • k <br /> 22, GROUND WATER SAMPLING ' <br /> Following,well purging, ground water levels in'all•purged monitoring.,wells achieved a rniniriium F' <br /> 'I... ;,of 80i ercentrechar e: Groundwer sam les were collected from.all ur ed weltsatutilizirinewv < :r <br /> g <br /> 'disposable polyethylene-bailers and were`transferi'ed,into one-liter amber.bottles and 4071n1'EPA <br /> -approved VOA vials_containing 0.5.ml 18%hydrochloric acid as-a'preservative: Care was taken-`to <br /> ' ,ensu:6 that visible'air bubbles were not present in the vials:after fillingand ca in . Ground.water' <br /> Pl? . g <br /> sample containers'were labeled with-the well designation, date, tirne,.and sampler's-initials. <br /> 2.31LABORATORY.ANALYSIS OF GROUND WATER;SAMPLES' <br />' r Each•ground water sample was rlogged`on'a chain-of-custody form,placed ina' chilled container and , <br /> 'transported to a California Department of Health Services`(DHS)-certifiedlaboratory fora lysis' ; <br /> for: - <br /> Total petroleum' hydrocarbons„quantified as gasoline and diesel and -TPH-d, I { <br /> '. respectively) by EPA Methods 8015M/3550/5030, = <br /> • ;Volatile,;aromatic.compounds: benzene; •toluene, ethyl benzene-and xylene (BTEX).witl <br /> ,methyl-tertiary butyl ether (MTBE) by'EPA Method 802O.'�and <br /> f •.. <br /> Tr <br /> ertiary butanol,(TBA), di' isopropyl ether (DIPE), ethyl tert butyl ether (ETBE);'fertairy! <br /> methyl ether (TAME),and'MTBE by EPA Method 8260 Modified. <br /> le 1 <br /> 3.0. 'FINDINGS <br /> AGE was able to'de'termine from'f 'Id data collected'ori 22'September`1999 that ground watei flow <br /> direction:of the';site was generally towards the north-nortlieast at'a gradient'of 0.003: Laboratory, <br /> analysis of four ground water monitoring well samples les detected TPH- ,andJBTEX com"'o' ds.;in " <br /> p g P <br /> one ground water sample; no.,fuel oxygenated„compounds were detected in any',ground water <br /> samples. <br /> 3 1 GROUND WATER'ELEVA <br /> ' TION AND GRADIENT <br /> ,. Th'e.depths,to'grourid water in'wells MWA.through MW-4 were measured between 8.95'aiid,9.57, <br /> feet below the-tops of the well casings_Ground-water elevations at the site'were calculated to be; <br /> between 30.73 feet and 3 L51 feet above mean sea-level; ground water elevations from the`site are' <br /> I " Advanced GeoEnviroemenial,Inc. :l <br />