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' 13 July 1999 S AGE-NC Protect No 95-0142 ' Page 2 of 4 physical parameters Purge water stabilization field data sheets are included in Appendix A Purged ' water was stored on-site in labeled DOT-approved 55-gallon drums ' 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), • EPA Method 8260 Modified for di-isopropyl ether(DIPS),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 distribution of dissolved petroleum hydrocarbons was inferred from the laboratory analytical results ' from the ground water samples ' 3 1 GROUND WATER GRADIENT AND DIRECTION Depth to ground water at the site ranged from 24 91 feet to 25 66 feet below the well casing tops ' The relative ground water elevation data is depicted in Table 1 During the June 1999 monitoring event,the ground water flow direction appeared to be easterly The relative elevation of the ground ' water surface at the site is illustrated on Figure 3 ' Advanced GeoEnvironmental, Inc