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s 10 April 2001 AGE-NC Project No 99-0592 Page 2 of 4 ' Temperature, pH and conductivity were measured at 1-gallon intervals using a Hydac water analyzer to n-ionitor 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 i ' A waters le was collected"from monitoring well MW-1 using n 1 filer r amp g g a new disposable ba 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 contaming 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 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) and as diesel (TPH-d) in accordance with EPA Method 503018015-Modified and 3550/8015-Modified, respectively, • Volatile aromatic compounds, including benzene, toluene, ethylbenzene, and total xylenes r (BTEX) and 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 I ether(ETBE), tert-amyl methyl ether(TAME), and MTBE in accordance with EPA Method 8260M 3.0. FINDINGS 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 Depth to ground water was 53 55 feet below the top of the well casing in MW-1, a decrease of 145 feet since the 20 December 2000 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 Iadjacent former Cherokee Track Stop site(3 53 5 East Cherokee Road) collected on 28 March 2001 to determine the approximate ground water flow direction Ground water flow direction was inferred Advanced GeoEnvironmental,Inc I 1