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�i <br /> 1 <br /> . 02 April 2002 r <br /> AGE-NC Project No 97-0312 f <br /> Page 2 of 5 y , <br /> The pump was allowed to cycle on and off for approximately' 15 minutes To purge the small <br />' domestic well, a faucet between the well and the water holding tank was opened to allow the pump <br /> to cycle for approximately 15 minutes <br /> 1 ` <br /> l <br /> ,e <br /> 22 COLLECTION OF GROUND WATER SAMPLES <br /> 1 , u <br /> The depth to water in the monitoring wells was re-measured following purging to assure a minimum <br /> of 80%recharge prior to sampling Water samples were retrieved from each purged monitoring well <br />' using new disposable bailers and an equipment blank was collected from the discharge hose of the <br /> 2-inch submersible purge pump following decontamination 'To sample the domestic wells, a <br /> sampling port was opened of the well head and samples were collected from the sampling port while <br />' the pump was operating to obtain fresh water samples Each sample was transferred into four <br /> laboratory-supplied 140-m1 EPA-approved VOA vials containing 0 5 ml of 18% hydrochloric acid <br /> as a sample preservative and into one 1-liter amber bottle without preservative The samples were <br /> labeled, placed in a chilled container and transported under chain-of-custody to McCampbell <br /> Analytical Inc (MAID in Pacheco, a California Department of Health Services (DHS)-certified <br /> analytical laboratory The samples were analyzed for <br /> Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> • p Y q <br /> accordance with EPA Methods 5030/8015m and 3550/8015m, respectively, <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) in accordance with EPA Method 8020, <br /> • Fuel oxygenates-MTBE,di-isopropyl ether(DIPE),'ethyl tert'butyl ether(ETBE),tert-amyl - <br /> methyl ether(TAME) and tert-butanol (TBA) in accordance with EPA Method 8260b, and <br /> • Halogenated volatile organic compounds(HVOCs) in accordance with EPA Method 8010 <br /> 1 3.0: FINDINGS I <br /> Ground water elevations were determined by subtracting the measured depths-to-water from the <br /> surveyed casing elevations (Table 1) Ground water flow direction was determined by contouring <br /> the water elevations on'a scaled site plan (Figure 4) Hydrocarbon-impact to ground water was <br /> assessed by laboratory analysis and field observations , <br /> 1 <br /> 1 — <br /> Advanced Geo Environmental,Inc <br /> 1 <br /> I <br /> i <br /> r '+ <br /> I , <br />