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r r 1 _ � J 07 December 1999 • AGE-NC Project No 95-0142 ' . ;Page2of4 Purge water stabilization field data sheets are included in Appendix A Purged water was stored on- site in labeled DOT-approved 55-gallon drums N r 2 2 ' GROUND WATER SAMPLE COLLECTION ' Water samples were collected from each purged well using new, clean, disposable plastic bailers Immediately upon retrieval, the samples were transferred'into EPA-approved 40-m1 VOA vials - containing 0 5 milliliter hydrochloric acid (18%) as a sample preservative The vials were then ' labeled and placed In a chilled container The samples were transported under chain-of-custody to McCampbell Analytical, Inc (MAI) a DHS-certified laboratory in Pacheco, California for analysis Ground water samples were analyzed in accordance with • EPA Method 8015 Modified for total petroleum hydrocarbons quantified as gasoline (TPH- g), ` • EPA Method 8020 for volatile aromatic hydrocarbons (benzene, toluene, ethylbenzene and total xylenes BTEX), and ' EPA Method 8260 Modified for fuel oxygenating compounds including di-isopropyl ether (DIPE), ethyl tertiary butyl ether(ETBE), methyl tertiary butyl ether(MTBE), tertiary amyl ' methyl ether (TAME) and tertiary butyl alcohol (TBA) ' 3.0. FINDINGS Ground water flow direction and gradient were calculated from the field data The current tdistribution of dissolved petroleum hydrocarbons was inferred from laboratory analytical results of E the ground water samples 3 1 GROUND WATER GRADIENT AND DIRECTION Depth to ground water at the site ranged from 25 75 feet to 26 80 feet below the tops of the well casings The relative ground water elevation at the site ranged from 71 35,feet to 73 08 feet The elevation and ground water depth data is depicted in Table 1 During the September 1999 monitoring event, ground water flow direction appeared to be somewhat easterly, but very low gradient causes ' distortions of the contour lines The relative elevation of the ground water surface at the site is ' illustrated on Figure 3 1 Advanced GeoEnwronmental,Inc