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y , <br /> 01 June 2005 <br /> . AGE-NC-99-0570 , <br /> Page 2 of 4 �d S �Vj <br /> I2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES WWA) 54 <br /> Ground water samples were collected from wells MW-2 through MW-5 using dedicated,disposable <br /> bailers Immediately upon retrieval, ' samples were transferred into three 40-milliliter (ml) <br /> Environmental Protection Agency(EPA)-approved volatile organic analysis(VOA)vials containing <br /> 0 5 ml 18% hydrochloric acid solution as a sample preservative, and into one 1-liter amber bottle <br />' without preservative <br /> At the request of the EHD,a ground water sample from the on-site domestic well was also collected ` <br /> and analyzed To ensure that formation water was being produced,water was allowed to run out of <br /> the well for approximately 20 minutes, which was long enough to automatically turn on the well <br /> pump Ground water was poured directly into the 40-m1 VOA vials and a 1-liter amber bottle from <br /> a valve at the well head <br /> All samples were logged on a chain of custody form, stored in a chilled container, and transported <br /> under chain of custody to Cal Tech Environmental Laboratories (CTEL), a California Department <br /> of Health Services (DHS)-certified laboratory, for analysis Ground water samples were analyzed <br /> • for the following constituents <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively) in accordance with EPA method 8015M, and <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and oxygenated compounds di- <br /> isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether <br /> (MTBE), tertiary-amy_1 methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2- <br /> dibromoethane(EDB),and 1,2-dichloroethane(1,2-DCA)in accordance with EPA Method <br /> 8260B <br /> 3.0. FINDINGS <br /> Ground water elevation,`flow direction, and gradient were determined from field data collected on <br /> 26 January 2005, hydrocarbon impact to ground water was assessed by laboratory analysis of the <br /> ground water samples <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The depth to ground water ranged from 15 04 feet below well casing grade in well MW-1 to <br /> • 16 01 feet below well casing grade in well MW-5 (Table 1) The relative ground water elevation <br /> ranged from 9 36 feet to 11 69 feet below mean sea level (MSL) The top of the ground water table <br /> Advanced GeoEnvironmentsl,Inc <br /> f <br />