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1 <br /> ' I 1 <br /> 28 February 2003 <br /> AGE-NC Project No 95-013 5 <br /> Page 2 of 4 - <br /> 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Prior to the collection of ground water samples,the depth to ground water was re-measured in each <br /> wellto ensure that a nunimum of 80% of the initial water volume bad recharged Water samples were <br /> then collected from each well using the pre-dedicated disposable bailer The samples were transferred <br /> mto 40-ml EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml hydrochloric acid <br /> (18%) as a sample preservative The samples were transported in a chilled container under chain-of- <br /> custody <br /> hain-ofcustody procedures to CalTech'Environmental Laboratories (CTEL), a California Department of <br /> Health Services-certified laboratory, for analytical analysis The samples were analyzed for <br /> r <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) In accordance with EPA <br /> Method 8015 Modified and <br /> C Benzene, toluene, ethyl benzene and total xylenes (BTEX) and Oxygenating compounds <br /> Including methyl tertiary-butyl ether(MTBE),tertiary-butyl alcohol(TBA),di-isopropyl ether <br />' (DIPE), ethyl tertiary-butyl ether (ETBE) and tertiary-amyl methyl ether(TAME), ethylene <br /> dibromide(EDB) and 1,2-dicbloro ethane (1,2-DCA) in accordance with EPA Method 8260 <br /> . Modified ' <br /> 1 3.0. FINDINGS <br /> Ground water flow direction and gradient were Inferred from field data, the petroleum hydrocarbon <br />' impact on ground water was quantified by the results of laboratory, analysis <br /> s <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> During the January 2003, monitoring event, depths to ground water in wells MW-1 through MW-3 <br /> were measured between 26 29 to 27 72 feet below the tops of the well casings The water level had <br /> decreased approximately 1 5 foot between February 2002 and January 2003 (Table 1) Ground water <br /> elevations were calculated to range be between 14 37 feet(MW-1 B)and 14 72 feet(MW-3B)below <br />' mean sea level The ground water flow direction was mferred to be north-northeast under a gradient <br /> Of 0 008 ft/ft <br /> Ground water elevation data for wells MW-1B through MW-3B (water table wells) during the <br /> January 2003 ground water monitoring event is depicted on Figure 3 <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES , <br /> • <br />' Advanced CeoEnvlronment4Inc <br /> r <br />