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22 August 2000 . AGE-NC Project No 99-0592 Page 2 of 4 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES ' A water sample was collected from monitoring well MW-1 using a new disposable bailer after P 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-I after the well purge valve was opened and water was allowed to run for more than 30 minutes, allowing the pump to turn on The samples were transferred into laboratory-supplied 40-ml,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 ofHealth Services(DHS)-certified analytical laboratory for analysis The samples were analyzed for ' 0 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 ' • 0 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 I ' 30 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 I3 1 GROUND WATER ELEVATION AND GRADIENT ' Ground water elevation decreased 2 22 feet to 55 18 feet below the top of the well casing In MW-1 Lt`1 since the 15 February 2000 monitoring event Ground water elevation data are presented on Table 1 Monitoring data from MW-1 was combined with monitoring well data from an adjacent site to I determine the ground water flow direction Ground water flow direction was Inferred to be northwesterly with a gradient of 0 005 ft/ft The flow direction has significantly changed compared to previous monitonng events The flow direction has rotated approximately 100 degrees to the west Figure 4 - Ground Water Elevation depicts the contours for June 2000 The gradient map was expanded to Include data from monitoring wells,located at 3535 East Cherokee Road ' Advanced GeoEnvironrnental,Inc