ARCHIVED REPORTS XR0000813 - Laserfiche WebLink

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Date. October 21,2005 Quarter- P Quarter,2005 ANALYTICAL DATA REVIEW: Based on the review of the analytical and hardcopy data (chain-of-custody records,blanks, dilutions,holding times, LCS/LCSD results,MS/MSD results, and surrogate recoveries), the data are acceptable as reported by the laboratory with the following limitations • The reported results for gasoline range organics (GRO) in sample MW-4 is due to chromatographic peaks present in the gasoline range,however,the peaks present do not resemble the pattern for gasoline • The elevated reporting limits were the result of dilutions performed-by the laboratory in order to quantitate a target analyte DISCUSSION: GRO, benzene, toluene, ethylbenzene,total xylenes (BTEX), methyl tert-butyl ether (MtBE),tert-amyl methyl ether (TAME), 1,2-dichloroethane (I,2-DCA), and 1,2-dibrobmoethane (EDB) were detected above laboratory reporting limits in groundwater samples collected from site wells this quarter Toluene concentrations in MW-1 increased but remained consistent with second quarter 2004 GRO concentrations in MW-4, were detected at the highest concen- trations historically and MtBE was detected at the highest concentration since second quarter 2004 In VW-213, toluene, ethylbenzene, and total xylenes was detected for the first time since fourth quarter 2004 Other analyte concentrations were generally consistent with historic data Groundwater elevations in wells across the site decreased relative to the previous reporting period The inferred groundwater flow direction across the site was generally to the northwest and toward the4u4tb_-au4east toward at an average hydraulic gradient of 0 007 to 0 01 ft/ft1 V»? Qo3 t') (lhlro r-fl\ /Z . The SVE system began operations on August 30, 2004 Approximately 196 9 lbs of GRO, 0 00 lbs of benzene and 0 00 lbs of MtBE were removed during the third quarter 2005 The SVE system operated in compliance with the San Joaquin Valley Air Pollution Control District (SJVAPCD)Permit to Operate#N-5083 A performance evaluation of the remedial systems between July 1,2005,and September 30,2005,are presented as Appendix A This report is based on data, site conditions, and other information that are generally applicable as of the date of the report,and the conclusions and recommendations herein are therefore applicable only to that time frame FIGURES Figure 1 Groundwater Elevation Contours Figure 2 Groundwater Analytical Summary TABLES . Table I Groundwater Elevation and Analytical Data Table 2 Fuel Oxygenates Analytical Data Table 3 Groundwater Gradient Data Table 4 Analytical Results of Soil Vapor Treatment Analysis APPENDICES Appendix A Site 2186 Remedial System Performance Evaluation Appendix B Field and Laboratory Procedures Appendix C Laboratory Analytical Reports,Cham-of-Custody Documentation,and Field Data Sheets . Appendix D GeoTracker Upload Confirmation K SWpmccw\J5 BP ARC0+02186\Qaanerky12005\3 QTR 05\2186 GWNiR 3Q05 do Page 2