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Date July 31,2002 <br /> Quarter 2nd Quarter,2002 <br /> • DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and xylenes (total), and Methyl <br /> tert-butyl ether (MtBE) were reported as nondetectable in all wells with the exception of MW-6 MW-6 contained <br /> 150 ppb gasoline and 260 ppb MtBE(EPA Method$26013) Chemical concentrations were generally consistent with <br /> historical analytical data On average, groundwater elevations across the site decreased by 0 74 ft since the last <br /> quarter Groundwater flow was to the north at an approximate gradient of 0 003 ft/ft <br /> This report presents our understanding of existing conditions at the subject site The conclusions contained herein <br /> are based on the analytical results, and professional judgment in accordance with current standards of professional <br /> practice, no other warranty is expressed or implied URS assumes no responsibility for exploratory borings or data <br /> reported or supplied by other consultants or contractors <br /> TABLES <br /> Table 1 Groundwater Elevation and Analytical Data <br /> Table 2 Fuel Oxygenates Analytical Data <br /> Table 3 Groundwater Gradient Data <br /> FIGURES <br /> Figure 1 Groundwater Elevation Contour Map <br /> Figure 2 Groundwater Concentration Map <br /> APPENDICES <br /> Appendix A Field and Laboratory Procedures <br /> Appendix B Laboratory Analytical Reports,Chain-of-Custody Documentation,and Field Data Sheets <br /> K V5 BP ARCoWWOV0 ua erW_QTR OZG%V Rt doc Page 2 <br />