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r-' ' y ' 04 December 2000 AGE-NC Project No 99-0592 Page 2 of 4 I ' I22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES A water sample was collected from monitoring well MW-1 using a new disposable bailer after_ '} allowing the well to achieve a minimum 80% recovery of the pre-purge water volume Additionally, a water sample was collected from domestic well DW-1 after the well purge valve was opened and water was allowed to run until the pump turned on The samples were transferred into laboratory- supplied 40-mI EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative The sample vials were then labeled with the monitoring well or domestic well designation, date, time of sampling and the sampler's initials The samples were transported in a ' chilled container under chain-of-custody to McCampbell Analytical, Inc (MAI), a California Department of Health Services (DHS)-certified analytical laboratory for analysis The samples were ' analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 5030/8015-Modified, ' 0 Volatile aromatic compounds, including benzene, toluene, ethylbenzene, and total xylenes (BTEX)with methyl tertiary butyl ether(MTBE) in accordance with EPA Method 8020, and • Fuel oxygenates, including tertiary butanol(TBA), di-isopropyl ether(DIPE),'ethyl tert-butyl ether(ETBE), tert-amyl methyl ether(TAME), and MTBE in accordance with EPA Method ' 8260M ' 3.0. FINDINGS ' Hydrocarbon-impact to ground water was inferred from laboratory analysis and field observations Ground water elevation was determined by subtracting-the measured depth-to-water from the surveyed casing elevation I 3 1 GROUND WATER ELEVATION AND GRADIENT ' Ground water elevation decreased 2 48 feet to 57 60 feet below the top of the well casing in MW-I since the 14 June 2000 monitoring event Ground water elevation data are presented on Table 1 ' Monitoring data from MW-1 was combined with monitonng well data collected from the adjacent former Cherokee Truck Stop site (3535 East Cherokee Road) on 29 September 2000 to determine the approximate ground water flow direction Ground water flow direction was inferred to be ' northeasterly with a gradient of 0 007 ft/ft The flow direction has rotated approximately 100 degrees to the east, as compared to the June 2000 monitoring Figure 4 depicts the contours for September 2000 The gradient map includes data from monitoring wells located at 3535 East Cherokee Road Advanced GeoEnviroamental,Inc i 1