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1 I i I M 1 1 23 June 2001 • AGE-NC Project No 99-0592 ' Page 2 of 4 ITemperature, pH and conductivity were measured at 1-gallon intervals using a Oakton water analyzer to monitor stabilization of these ground water parameters The field data are tabulated and are included in Appendix A Purged water is temporarily being stored on-site in 55-gallon drums I 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 allowing the well to achieve a munimum 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-m1 EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative The sample vials were then labeled with well designation, date, time of sampling and the sampler's initials The samples were transported in a chilled container under chain-of-custody ' to McCarnpbell 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) and as diesel (TPH-d) in accordance with EPA Method 503018015-Modified and 3550/8015-Modified, respectively, o Volatile aromatic compounds, including benzene, toluene, ethylbenzene, and total xylenes ' (BTEX) and methyl tertiary butyl ether(MTBE) in accordance with EPA Method 8020, and Fuel oxygenates, including tertiary butanol(TBA),di-isopropyl ether(DIP E), etliyl telt-butyl I ether(ETBE),tert-amyl methyl ether(TAME), and MTBE in accordance with EPA Method 8260M 3.0. FIlYDINGS ' Ground water elevation and flow direction were calculated from field data, hydrocarbon-impact to ground water was assessed by laboratory analysis of the ground water samples ' 3 1 GROUND WATER ELEVATION AND GRADIENT I Depth to ground water was 57 21 feet below the top of the well casing in MW-1, a decrease of 3 66 feet since the 28 March 2001 monitoring event Ground water elevation data are presented on Table 1 Monitoring data from MW-1 was combined with monitoring well data collected from the ' adjacent former Cherokee Truck Stop site (3 53 5 East Cherokee Road) also collected on 18 June 2001 to determine the approximate ground water flow direction Ground water flow direction was inferred to be northeasterly at a gradient of approximately 0 001 ft/ft Figure 3 depicts the contours Advanced GeoEnvironmenW,Inc I I