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Updated Site Conceptual Model and Second Quarter 2002 Monitoring and Remediation Report Cleanup and Abatement Order No 5-00-707 EAI Project No 1232 i5.5 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 Figure 14 summarizes the TPH-G, BTEX, and MTBE concentrations in ground water for the June 2002 ground water sampling event No MTBE, TBA, DIPE, ETBE, TAME, or EDB above laboratory reporting limits were detected in any of the ground water samples 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 µg/L and 58 µg/L, respectively In March 2002, the TPH-G concentration in this well was below the detection limit of X50 µg/L In June 2002, this well contained 63 4g/L TPH-G These data indicate that well MW-9 is 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-27, MW-9, MW-5, and MW-7 are below or at the detection limits i 1 i 1 i i ' BI-N 1232RO211 -8- ENVIRONMENTAL AUDIT, INC