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29 May 2000 <br /> AGE-NC Protect No 99-0592 <br />' Page 2 of 4 <br />' 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> A water sample was collected from monitoring well MW-1 using a new disposable bailer after <br />' allowing the well to achieve a minimum 80%recovery of the pre-purge water volume Additionally, <br /> a water sample was collected from domestic well DW-1 after the well purge valve was opened and <br /> water was allowed to run for more than 30 minutes, until the pump turned on The samples were <br />' transferred into 40-m1 EPA-approved vials containing 0 5 ml 18% hydrochloric acid as a sample <br /> preservative The sample vials were then labeled with the monitoring well or domestic well <br /> designation, date, time of sampling and the sampler's initials The samples were transported in a <br />' chilled container under chain of custody to McCampbell Analytical, Inc (MAI}, a California <br /> Department of Health Services(DHS)-certified analytical laboratory for analysis The samples were <br /> analyzed for <br />' a Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EP,A <br />' Method 5030/8015Modified, <br /> • Volatile aromatic compounds, including benzene, toluene, ethylbenzene, and total xylenes <br /> (BTEX) with methyl tertiary butyl ether (MTBE) in accordance with EPA Method 8020, <br />' • Fuel oxygenates,including tertiarybutanol(TBA),di-isopropyl ether(DIPE),ethyl tert-butyl <br /> ether(ETBE),tert-amyl methyl ether(TAME),and MTBE in accordance with EPA Method <br />' 8260M, and <br /> • Additionally, sample DW-1 was analyzed for volatile organic compounds by EPA Method <br /> 5242 <br /> 3.0. FINDINGS <br /> Hydrocarbon-impact to ground water was inferred from laboratory analysis and field observations <br /> Ground water elevation was determined by subtracting the measured depth-to-water from the <br /> surveyed casing elevation <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> Ground water elevation increased 2 56 feet to 52 96 feet below the top of the well casing in MW-1 <br /> since the 15 November 1999 monitoring event Ground water elevation data from MW-1 was <br /> I combined with data from an adjacent site to infer ground water flow direction for the previous <br /> monitoring event The ground water flow direction during the previous'monitonng event of 15 <br /> November 1999 was northeasterly with an approximate gradient of 0 0012 ft/ft However, ground <br /> IAdvoneed GeoEnvironmental,Inc <br /> 1 <br /> 1 <br />