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. 16 April-200'0' . . AGE NC'Project No: 98-0468 Page 4 of 4 ' Laboratory results of groundwater samples analyzed for petroleum hydrocarbons,fuel additives and VOCs are summarized.in Table 2. The laboratory reports'(MAI Laboratory'ID: 617t0.to 91715), quality, assurance and- quality control,(QA/QC)' reports arid chains-of-custody'are included in Appendix B.• A volume and mass calculation of the MTBE in the ground water at 0e; site is ' presented in Appendix C. 4.0. SUMMARY,Y/CONCLUSIONS k The following summarypoints and conclusions were drawn from the results of the site investigation: • During this m6nit0ring event; the depth_to ground water was withinthe,well screen intervals. Ground water.elevation in'the monitoring wells increased an average 6f 0:9 feet since.the previous monitoring event. • • Based on,gr water elevation data, groundwater flow,direction is inferred to be toward, the;northeast. Ground water gradient for March 2000 was calculated to be 0,012. • MTBE was detected in the ground water samples collected from MW-3, MW-4'and MW-6 b EPA Method 8260. A roximatel 77 s of MTBE are dissolved in a thirty foot thick-. .Y, pp gran? aquifer, within the monitoringwell network. The down-gradient extent'of MTBE-impacted-ground water has been delineated to.the DHS-:. established maximurh contaminant level (MCL) of 5 ,ug/1 for MTBE in,ground water. 5.0. RECOMMENDATIONS ' collected at the"site 'AGE recommends continuation of the uarterl ground water Based upon data co e ,_ q Y gr monitoring program, the next.ground_water monitoring event is scheduled to be conducted in early' ' June 2001. ; LIMITATIONS r. AGE's professional services were performed using that degree of care and skill ordinarily exercised by environmental•consultants practicing in this,or. similar localities..The findings were based'upon: a.nalytical,results provided by an independent laboratory. Evaluations of the,geologic/hydrogeologle conditions at-the site for the purpose of this investigation were, from a.limited number of available data points (i.e.,monitoring well grour;d water samples) and subsurface conditions may. . .' vary beyond these data -points. yNo other warranty' expressed or implied, is'made as:to the ', professional recommendations contained in this report. ' Advanced Ge4tivironmental,Inc.