Laserfiche WebLink
Date October 6,2004 <br /> Quarter 3rd Quarter,2004 <br /> • • The reported results for ethanol in samples AMW-1, AMW-2, AMW-3, AMW-4, MW-3, MW-7, and MW-8 <br /> should be considered estimated, the calibration verification associated with these samples was outside contract <br /> acceptance limits but within method limits <br /> • The elevated reporting limits were the result of dilutions performed by the laboratory in order to quantitate a <br /> target analyte <br /> DISCUSSION: <br /> Gasoline range organics (GRO), benzene, ethylbenzene, MtBE, and tert-butyl alcohol (TBA) were reported above <br /> method detection limits in groundwater samples collected from site wells during this quarter Analyte concentrations <br /> were generally consistent with historic site data <br /> Groundwater elevations in the site monitoring wells decreased relative to the previous monitoring event The inferred <br /> direction of groundwater flow across the site was to the northwest at an average hydraulic gradient of 0 005 ft/ft <br /> Regionally, the inferred direction of groundwater flow was toward the north and northwest at an average hydraulic <br /> gradient that ranged from 0 005 to 0 007 ft/ft A regional groundwater elevation contour map (Figure 1) and a <br /> regional groundwater analytical summary (Figure 2) were created with data from the former Chevron service station <br /> at 575 Grant Line Road and the former Scotty's service station at 574 Grant Line Road Groundwater elevation and <br /> analytical data from the former Chevron and former Scotty's service stations are attached as Appendix C <br /> This report is based on data, site conditions, and other information that are generally applicable as of the date of the <br /> report,and the conclusions and recommendations herein are therefore applicable only to that time frame <br /> TABLES <br /> Table 1 Groundwater Monitoring and Analytical Data <br /> Table 2 Fuel Oxygenates Analytical Data <br /> Table 3 Groundwater Gradient Data <br /> Table 4 Monitoring Well Construction Data <br /> FIGURES <br /> Figure 1 Regional Groundwater Elevation Contours <br /> Figure 2 Regional Groundwater Analytical Summary/Cross-Section A-A' &B-B' Plan View <br /> Figure 3 Concentration and Water Level Trends(Well MW-2) <br /> Figure 4 Generalized Geologic Cross-Section A-A' <br /> Figure 5 Generalized Geologic Cross-Section B-B' <br /> APPENDICES <br /> Appendix A Sampling and Analysis Procedures <br /> Appendix B Laboratory Analytical Reports,Chain-of-Custody Documentation,and Field Data Sheets <br /> Appendix C Former Chevron and Former Scotty's Groundwater Monitoring Data <br /> Appendix D GeoTracker Upload Confirmation <br /> K 1Wpmcc \JS BP ARCON1 I1941QuanerlyV00413 QTR 04\11194 GWMR 3Q04 doc Page 2 <br />