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.Tj i <br /> W-10, W-11, and W-12. During the second quarter of 1996, petroleum hydrocarbons were not detected in wells <br /> W-I A, W-2, or W-9, but were detected in well W-5. Wells W-2B, and W-10 through W-12 are on a semi-annual <br /> sampling schedule and were not sampled during the second quarter sampling event. During the third quarter 1996 <br /> '. sampling event, total petroleum hydrocarbons as gasoline(TPH-G) were detected in wells W-10 and W-11. These <br /> wells are upgradient and cross gradient, respectively, from the former source area. Petroleum hydrocarbons were <br /> not detected in any other wells during the third quarter event. <br /> The occurrence of petroleum hydrocarbon constituents in the site wells is inconsistent with the remediation history <br /> of the site. Additionaily, the wells are all sampled using a submersible pump, which can be difficult to <br /> decontaminate properly. Therefore, it is the opinion of Brown and Caldwell that the presence of petroleum <br /> hydrocarbons in the site wells is inconclusive and is probably the result of sampling equipment contamination. <br /> ATTACHMENTS: <br /> Figure 1. Groundwater Elevation Map <br /> Figure 2. Constituent Concentration Map <br /> Table 1. Water-Level Elevations <br /> Table 2. Historical Flow Directions and Gradients <br /> Table 3. Analytical Results <br /> Appendix A. Field Data Sheets, Laboratory Reports, and Chain-of-Custody Documentation <br /> i <br /> 40 <br /> Use or disclosure of data continued on this sheet is subject to the restriction specified at the beginning of this document. <br /> 33 821REPORTSI3 RDQTR96.DOC <br />