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' 16 December 2004 • AGE-NC Project No. 95-0137 ' Page 4 of 5 (gg/l) in the sample from well MW-4 .The analytical results are summarized in Tables 2 and 3. A ' copy of the laboratory report (CTEL Project Number CT214-0407133), quality assurance/quality control (QA/QC) report, and chain of custody form are included in Appendix C. Also included in Appendix C are documents confirming the upload of laboratory electronic deliverable format(EDF) ' files and depth to water measurements to GeoTracker. ' 3.3. ANALYTICAL RESULTS OF SOIL-VAPOR SAMPLES TPH-g, BTEX compounds and MTBE were not detected in the effluent SVE air flow samples. The ' laboratory reports (CTEL Project Nos. CT214-04010035, -04010079, -0410177 and -0411162), QA/QC reports and chain of custody forms analytical results of the soil vapor samples are included ' in Appendix D. ' 4.0. SUMMARY AND CONCLUSIONS Based on the data collected from the site, AGE finds: • The ground water depth remained stable between the third and fourth quarter events in 2004. The ground water flow direction southeast of the former UST location was inferred to be ' northwest,but was essentially flat northwest of the former UST area. • Dissolved petroleum hydrocarbon concentrations were below detection limits in fourth ' . quarter 2004. • Dissolved 1,2-DCA concentrations have remained stable and generally declining;however, the concentrations are still abovg the DHS'Maximum Contaminant Level'(MCL)of 0.5 p.g/l ' in drinking wateA `,,I r0ij115)14,41t- The 5) 1 t--- • The hydrocarbon impact to soil has been mitigated.Soil vapor extraction samples were non- detect for the chemicals of concern. ' 5.0. RECOMMENDATIONS Based on .the findings of the remediation activities recounted in this report and previous investigations, AGE recommends: ' As required by the EHD by letter dated 14 September 2004,AGE has submitted a work plan for the lateral assessment of the dissolved 1,2-DCA west of the site; AGE recommends securing an access agreement from the City of Ripon for off-site encroachment. '- Advanced CeoEnvironmental,Inc.