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hI1% '.. F;7f r • s + - 1 i' :r 1 h {: 0 r h 'Y.r _ •'ti ,Y. 1 ,. 1 " fM r 1 1 1 r� ,; � ] 'r+�1 lye- i =, 4 y 4 .I � . I Y ,} hl i 1 30 July 2003 AGE-NC'Project:No.,98-0504 Page,5 of.7, -•The water.level.-and the total well de th in eacfi monitoring'wellwere measured relative to.the tops ' p ' of'the well.casings using•a:Soliristwater t6vel 'meter: After water levels and total depths were measured, a'steel bailer was used to purge five gallons fronfdach.well casing. Then a dedicated, inertial Waterrapump was used to reamove 20 gallons of•water from the wells Temperature;pH and conductivity of the purged water were.measured at one-gallon.intervals using. I- an.Oakton water analyzer:'during purging;, the values had generally stabilized-,by the.eiid•of•the purging, rocess. (Appendixr Purged water was stored:on-site in, 55-gallon, Department of p _ _Transportation-approved drums AGE surveyed a reference point on the top of each groundwater monitoring well 'casing at the site to the nearest 0.01-foot'relative to the City of Stockton Bench Mark No.HS0391,at 14.47,feet above, ' mean sea-level (MSL). 3.5. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES" ; '�. Ground water samples were collected from the monitoring wells 'using disposable polyethylene ; bailers; these-bailers were disposed of after-one use and require no decontaminating, thereby- minimizmg cross contamination-due to sampling devices. Each.water sample was transferred into ' three 40-ml EPA-approved VOA vials containing 0.5 ml 18%HCl as a sample preservative. After collection,the samples were labeled and placed in a chilled container for transportation under chain- of-custody.to Cal Tech Environmental Laboratory (CTEL), a`.California Department of Health ' Services,certified Laboratory in Paramount;;California. Each sample'was analyzed for: • •Total petroleum.hydrocarbons.quantified as gasoline (TPH-g) in accordance''with EPA ' Method 8015 Modified; • Benzene, toluene;ethylbenzerie and total xylenes(BTEX) in accordance with EPA Method, 8260B; and Fuel additive compounds, including di-isopropyl ether (DIPE); ethyl-tertiary-. '. butyl ether(ETBE),methyl-tertiary-butyl ether(MTBE),tertiary-amyl methyl ether(TAME), and' t-butyl,`alcohol ,(TBA), 1,2-dichloroethane (1,2-DCA), 1;2-dibromoethane (EDB), ethanol and methanol in"accordance with EPA Method 8260B:- ' 4.0. FINDINGS ; Ground water elevation, flow direction, and,gradient were deterniined,from field data collected on ' 07 April 2003; the contaminant impact to Rsc�' ground water-was quantified,by,-the laboratory analytical data. • ' • `. ' 1#3air s,p i 1. •• � rtI ' ' Advanced GeoEnviroatnentalInc.Tn ' y Yn 03