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Updated Site Conceptual Model and First Quarter 2003 Monitoring and Remediation Report <br /> Cleanu and Abatement Order No 5-00-707 EA1 Proi ect No 1232 <br /> 5.5 Analytical Testing Results <br /> Hydrocarbon concentrations in ground water were generally lower during the first quarter 2003 <br /> sampling event than during the fourth quarter 2002 <br /> 5 5 1 Units A and B Wells <br /> For Units A and B, similar or lower hydrocarbon concentrations were generally observed <br /> during this sampling event when compared to the prior quarters data with the exception of <br /> wells MW-6 and MW-16 In general, these two wells had slightly higher testing results <br /> Figure 14 summarizes the TPH-G, BTEX, and MTBE concentrations in ground water for the <br /> February 2003 water sampling event No TBA, DIPE, ETBE, TAME, or EDB above <br /> laboratory reporting limits were detected in any of the ground water samples MTBE was <br /> detected in two ground water samples at a maximum concentration of 18 Pg/L (MW-13) <br /> 5 5 2 Units C and D Wells MW-8D MW-23S/D, and MW-24S/D) <br />' Similar or lower hydrocarbon concentrations were generally observed during this sampling <br /> event when compared to the prior quarters data (Table 1) <br /> Sparging of Units C and D will not be conducted at this time It is EAI's opinion that with time <br /> oxygen injected into Units A and B will diffuse downward to remediate the deeper zones <br /> 5 5 3 Well MW-9 and Other Perimeter Wells <br />' Generally, hydrocarbon concentrations in lateral and down gradient wells MW-5, MW-7, MW- <br /> 13, MW-14, MW-15, MW-16, MW-18, and MW-27 are at or below the laboratory detection <br /> limit One down gradient perimeter well, well MW-9, frequently contains low hydrocarbon <br />' concentrations In February 2003, down gradient well MW-9 contained no detectable TPH-G <br /> concentration and benzene (0 59 lig/L), toluene (1 1 Pg/L), ethylbenzene (0 5 ug/L), and <br /> xylenes (1 9 pg/L) all at low concentrations These data indicate that well MW-9 is at or near <br /> the down gradient extent of the hydrocarbon plume <br /> BHM WORD 1232120321 -9- ENVIRONMENTAL AUDIT,INC p <br />