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approved 17H drums. The contents of the drums were transported by a licensed hauler for disposal at a
<br /> • licensed waste treatment site. The volume of groundwater removed from the wells and other measured
<br /> sampling parameters are noted on the water sampling logs included in Appendix B.
<br /> 3.0 LABORATORY ANALYSIS
<br /> The groundwater samples were transported to STL Chromalab Analytical Labs, Inc., a state-certified
<br /> Iaboratory, located in Pleasanton, California. The groundwater samples were analyzed for the presence
<br /> �. of TPH-G, BTEX, the five fuel oxygenates, and 1,2 DCA and EDB in accordance with USEPA Method
<br /> 8260B. Copies of the laboratory analytical report and chain of custody record are in Appendix C.
<br /> �I
<br /> 4.0 SUMMARY OF RESULTS
<br /> A summary of the analytical results from current and past well sampling is presented in Table 1. Based
<br /> on the groundwater-level data for March 6, 2003, ATC has interpreted the groundwater gradient and flow
<br /> direction for the upper aquifer as shown on Figure 3. In the upper aquifer monitoring wells MW-5,
<br /> MW-6, MW-7 and MW-10, the groundwater elevation increased from the previous quarter an average of
<br /> 0.28 feet, ranging from 0.23 feet in monitoring well MW-7 to 0.34 feet in monitoring well MW-10. The
<br /> apparent groundwater flow direction in the upper aquifer was generally southeasterly at a gradient of
<br /> approximately 0.002 (Figure 3).
<br /> Based on the groundwater-levet data for March 6, 2003 (Table 1), ATC has interpreted the groundwater
<br /> gradient and flow direction for the lower aquifer as shown on Figure 4. In the lower aquifer monitoring
<br /> wells MW-IR, MW-2, MW-3, MW-4, MW-8 and MW-9, the groundwater level increased from the
<br /> previous quarter an average of 0.29 feet, ranging from 0.27 feet in monitoring wells MW-IR, MW-2 to
<br /> 0.32 in MW-9. The apparent groundwater flow direction in the lower aquifer was generally southeasterly
<br /> at a gradient of approximately 0.002 (Figure 4).
<br /> Laboratory analysis of the water samples collected on March 6, 2003 indicates TPH-G, BTEX, and
<br /> MTBE were not detected in groundwater samples collected from MW-8 n the local lower aquifer.
<br /> BTEX compounds were not detected in the groundwater samples during this sampling event. TPH-G
<br /> was detected in MW-1R (93 micrograms per liter (µg/l)), MW-2 (1,900 gg/l), and MW-5 (1,600 µg/])
<br /> (reported concentrations from MW-1R, and MW-5 were flagged by the laboratory for not matching the
<br /> gasoline standard). 'MTBE was detected in groundwater samples collected from MW-IR(95 µg11), MW-
<br /> ' 2 (2,100 µg11), MW-3 (0.75 4g/1), MW4 (3.1 gg/l) and MW-9 (0.97 µg/l) in the lower aquifer; and MW-
<br /> 5 (1,800 µg/l), MW-6 (1.5 µg/1), MW-7 (1.3 µg/1) and MW-10 (0.60 4g/1) in the upper aquifer. Fuel
<br /> oxygenates other than MTBE (TBA, DIPS, ETBE, TAME), and 1,2-DCA and EDB were not detected in
<br /> ' the groundwater samples collected from wells sampled this quarter with the exception of TAME in wells
<br /> MW-1R (0.59 µg/l), MW-2 (18 µg/1) and MW-5 (18 µg/l).'The concentration of MTBE in monitoring
<br /> well MW-2 increased from 450 µg/l last quarter to 2,100 gg/l this quarter. The next quarterly
<br /> groundwater sampling is scheduled for the second quarter of 2003.
<br /> 1
<br /> Quarterly GW Monitoring Report-1st Qtr 2003
<br /> C\_\X%_ �� Quik Stop No. 132
<br /> Quik Stop Markets,Inc.
<br /> J:TR0JECTS%QU1K STOP MKTSIOS 137WepWV2"161pir2003Rpt ATC Project(VO.75.82503.3204
<br /> April 1,2003
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