ARCHIVED REPORTS_XR0010750 - Laserfiche WebLink

Home Browse Search

' 17 January 2006 AGE-NC Project No 97-0249 ' Page 6 of 8 1,2-DCA was detected in ground water samples MW-2, MW-3 and MW-8A at maximum ' concentrations of 190 µg/1 from wells MW-2 and MW-8A, TAME was detected in ground water samples MW-2, MW-3 and MW-8 (A-C) at a maximum concentration of 380 µg/1 (MW-3) No analytes of concern were detected in the sample collected from the domestic well(DW-1)on-site ' No other fuel components were detected in the ground water samples Previous and current analytical results of ground water monitoring well samples are summarized in Tables 3 and 4,analytical results for the domestic water well sample are summarized in Table 5 Analytical ground water data for the ' Flag City Chevron's monitoring events are included in Appendix A The laboratory reports (CTEL Project Numbers 0509223 and 0509232), quality assurance/quality control (QA/QC) reports and chain of custody forms are presented in Appendix C, GeoTracker confirmation pages of the ' submitted laboratory electronic deliverable format(EDF) files are included in Appendix D ' 4.0. SUMMARY AND CONCLUSIONS The implications from the September 2005 ground water monitoring event are as follows ' • Generally, depth to ground water at the site varied between 10 feet and 15 feet bsg, ground water elevations ranged between 129 feet(MW-9B)and 2 66 feet(MW-4)below mean sea level • Ground water data collected from Hydrogeologic Units 1 through 6 at both the Three B's 1 Truck Plaza and the Flag City Chevron site's generally inferred a net ground water flow direction towards the east(Figures 4 through 7) ' • The most intense TPH-g-impacted ground water was reported from Hydrogeologic Unit 1 in the area of wells MW-2, MW-3, MW-6 and MW-8 (A-C) at concentrations as high as 120,000 µg/l (Figure 8) ' • The most intense TPH-d-impacted ground water was reported from Hydrogeologic Unit 1 in the area of wells MW-2 and MW-3 at a concentration as high as 18,000 µg/1 (Figure 9), an isolated TPH-d occurrence was reported at Flag City Chevron well MW-12A, approximately 200 feet southeast of the site • The most intense,on-site Hydrogeologic Unit 1 MTBE-impacted ground water was reported from the area of Three B's Truck Plaza wells MW-2, MW-3, MW-8A and MW-9(A-B) at concentrations as high as 300 µg/1 and from Flag City Chevron well MW-16 at a concentration of 34 µg/1 (Figure 10) ' • The most intense on-site,Hydrogeologic Unit 2 MTBE-impacted ground water was reported • from the area of Three B's Truck Plaza well MW-9A at a concentration of 32 µg/l, and from Advanced GeoEnvironmentai,Inc 1