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E1 <br /> Date: October 27,2005 <br /> Quarter: 3`d Quarter,2005 <br /> • The reported results for xylenes and GRO in sample VW-1 and for GRO in sample VW-8 may be <br /> biased low due to a low average percent recovery reported in the associated MS/MSD analysis. '. <br /> e E <br /> • The reported result for benzene in sample VW-8 may be biased high due to a high average percent <br /> recovery reported in the associated MS/MSD analysis. <br /> :' • The elevated reporting limits were the result of dilutions performed by the laboratory in order to <br /> quantitate a target analyte. <br /> �R <br /> DISCUSSION: <br /> GRO,benzene,toluene,ethylbenzene,total xylenes(BTEX),MtBE, and 1,2-dichlorothane(1,2-DCA)were detected <br /> above Iaboratory reporting limits in groundwater samples collected from site wells this quarter. GRO was detected in <br /> MW-1 for the first time historically. GRO,BTEX and MtBE concentrations in MW-5 increased. GRO,benzene,and <br /> MtBE concentrations in the vapor extraction wells (VW) were generally consistent with historical data with a few <br /> exceptions. GRO, ethylbenzene, and total xylene concentrations in VW-1 and ethylbenzene in VW-3 increased, the <br /> highest historically. ORO and MtBE concentrations in the microsparge (MS) wells were generally consistent with <br /> historical data. Benzene concentrations in MW-3B and MW-2 were detected above laboratory reporting limits, the <br /> highest historically. <br /> "The' average depth to water at the site was approximately 46 feet bgs during this quarter. Groundwater elevations <br /> generally decreased less than one foot relative to the previous sampling event. The inferred direction of groundwater <br /> flow across the site ranged from the east-southeast with an average hydraulic gradient of 0.005ft/ft. <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 /> FIGURES <br /> Figure 1 Groundwater Elevation Contours ' <br /> Figure 2 Groundwater Analytical Summary <br /> TABLES <br /> Tadle 1 Groundwater Monitoring and Analytical Data <br /> Table 2 Fuel Oxygenates Analytical Data <br /> Table 3 Groundwater Gradient Data <br /> 4 <br /> APPENDICES <br /> Appendix A Field and Laboratory Procedures <br /> Appendix B Laboratory Analytical Reports,Chain-of-Custody Documentation,and Field Data Sheets <br /> Appendix C GeoTracker Upload Confirmation <br /> s <br /> f K%ft-cesAJ5 BP ARC0102130\Qume,]y1200513 QTR 05%2130 GWMR 3Q05.dm Page 2 <br /> l <br /> E <br />