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n 5 F <br /> '. 20 April 2005 Y ` <br /> AGE-NC Project No 96-0235 <br /> Page 2 of 5 <br /> 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well utilizing the discharge tube of the Waterra <br /> inertial pump or a new, dedicated disposable plastic bailer after allowing the wells to`achleve a'` <br /> minimum 80% recovery of the pre-purge water volume Each water sample was transferred into <br /> 40-m1 volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample- <br /> preservative, in addition, water samples from two wells (MW-1 and MW-2) were transferred Into <br /> 1-liter amber bottles without preservative After collection,the samples were properly labeled,placed <br /> In a chilled container and transported under chain of custody to Cal Tech Environmental <br /> Laboratories(CTEL),a State of California Department of Health Services(DHS)-certified analytical ; <br /> laboratory, and were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) In accordance with;EPA <br />' Method 8015M and ' <br /> • Benzene,toluene,cthylbenzene and total xylenes(BTEX)and the fuel additives dl-Isopropyl <br /> ether(DIPE),ethyl tertiary-butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary- <br /> amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dlbromoethane (EDB) and <br /> 1,2-dl6hloroethane (1,2-DCA) In accordance with EPA Method,8260B <br /> I <br /> In addition, the Miter samples from wells MW-I and MW-2 were analyzed for total petroleum <br /> hydrocarbons as diesel (TPH-d) In accordance with EPA Method 8015M <br />' 3.0. FINDINGS - <br /> The hydrocarbon-Impact to ground water was quantified by laboratory analysis of the ground water <br />' samples Ground water elevation and gradient was determined by utilizmg,data collected from the <br /> field ' <br /> Y <br /> _ r t <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> Depths,to ground water ranged from 17 06 feet to 19 77 feet below the'tops of the well casings, <br /> ground water was within the screened Intervals of the shallow wells,buf was approximately 11 5 feet <br /> to 20 5 feet above the screened Interval of the Intermediate wells and 45 feet above the screened <br /> Intervals of the deep wells <br /> > The elevation of ground water In each well was calculated by subtracting the depth to ground water <br /> from the surveyed casing elevations (Table 1) Ground water elevations at the site ranged from <br /> T <br /> 1168 feet(MW-15A)to 15 48 feet(MW-2)below mean sea level(MSL) The average ground water <br />' Advanced GeoEnvironmental,Inc <br /> I <br />