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Updated Site Conceptual Model and Third Quarter 2002 Monitoring and Remediation Report Cleanup and Abatement Order No 5-00-707 EAI Proi ect No 1232 5.5 Analytical Testing Results 5 5 1 Units A and B Wells For Units A and B, similar or lower hydrocarbon concentrations were generally observed during this sampling event when compared to the prior quarters data with the exception of wells MW-2 and MW-11 which contained slightly elevated concentrations Figure 14 summarizes the TPH-G, BTEX, and MTBE concentrations in ground water for the September 2002 ground water sampling event No DIPE, ETBE, TAME, or EDB above laboratory reporting limits were detected in any of the ground water samples MTBE was detected in eight ground water samples at a maximum concentration of 20 pg/L (MW-27) TBA was detected in five ground water samples at a maximum concentration of 70 pg/L (MW-3) 5 5 2 Units C and D Wells (MW-81), MW-23S/D, and MW-24S/D) Similar or lower hydrocarbon concentrations were generally observed during this sampling event when compared to the prior quarters data The exception was well MW-24S where relatively higher concentrations of hydrocarbons were observed (see Table 1) Sparging of Units C and D will not be conducted at this time It is EAI's opinion that with time oxygen infected into Units A and B will diffuse downward to remediate the deeper zones 5 5 3 Well MW-9 and Other Perimeter Wells In September 2001 and December 2001, down gradient well MW-9 contained TPH-G at concentrations of 1,070 pg/L and 58 lig/L, respectively In March 2002, the TPH-G concentration in this well was below the detection limit of<50 pg/L In June 2002, this well contained 63 pg/L TPH-G and in September 2002, 240 pg/L TPH-G was observed in this well In September 2002, down gradient well MW-27 contained TPH-G (230 Vg/L) for the first time These data indicate that wells MW-9 and MW-27 are at or near the down gradient extent of the hydrocarbon plume at the Site Generally, hydrocarbon concentrations in lateral and down gradient wells MW-15, MW-14, MW-13, MW-18, MW-16, MW-5, and MW-7 are below or at the detection limits BHM WORD 1232RO291 -9- EIMR ONMENTA L AUDIT, INC