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DH KLEINEELDER and stored in an Iced chest under chain-of-custody The samples were then submitted to the analytical laboratory for analysis Groundwater samples were analyzed for BTEX, TPH-G, oxygenate analytes (TBA, MTBE, DIPS, ETRE, TAME), and 1,2-DCA 2 2 GROUNDWATER ELEVATION AND WELL DEPTH DATA Free product was not, nor ever has been observed among the wells, based on the measurements obtained utilizing the oil/water Interface probe and/or the visual ' observations Groundwater elevations decreased approximately 2 76 feet from the previous event performed in June 2004 The elevations ranged from —31 50 to —32 43 feet msl The groundwater flow direction is easterly to southeasterly at a gradient of approximately 0 003 feet per linear foot ' The well depth measurements at the air-sparging locations SP-1, SP-5, and SP-6 Indicated an appreciable amount of fill material has entered the wells The sparging wells were never Intended to be used for monitoring purposes and were never developed as such Furthermore, the screen placements of these air-sparging wells were selected to facilitate the infection of air Into the subsurface and not the collection of representative groundwater samples The tops of the screens in the air-sparging wells are approximately 20 feet below the groundwater table If further sampling or remediation activities are to be conducted at these locations, the air-sparging wells will need to be developed 2 3 BTEX AND TPH-G ANALYTICAL RESULTS Typical petroleum-hydrocarbons (BTEX and TPH-G) were detected in the groundwater samples from the following wells MW-1, MW-7, MW-11, MW-12, SP-1, SP-2, SP-4, SP- 6, PZ-1, and PZ-2 There were no detectable BTEX or TPH-G concentrations measured in the samples collected from wells MW-5, MW-8, MW-10, SP-3, and SP-5 The benzene concentrations Increased in wells MW-1, MW-7, MW-11 , MW-12, SPA, SP-4, SP-6, and PZ-2 The detectable benzene concentrations ranged from 1 9 micrograms-per-Liter (pg/L) at well MW-12 to 1 ,800 pg/L at well PZ-1 The remaining C23-484517-BOO/SAC5R540 Page 7 of 14 August 11, 2005 Copynght 2005 Klemfelder, Inc