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• ' 11'June 2004 .. AGE-NC Pro}ect No. 95-0106 ; IPage 6 of 6 i e TPH-g and BTEX compounds were detected in the shallow and deep grab;ground water-, samples,collected from borings,B17 and B18, at maximum concentrations of,160,000 n/l TPH-g, 5,600.µg/l'benzene,•14,000 µg/l toluene, 3,200 µg/l ethylbenzene and 12,000 µg/l-• xylenes. ' With the exception of low concentrations of MTBE at-total depth,in borings B17 and B18,...,,. ' the Vertical.and lateral extentof petroleum hydrocarbonimpactedsoil is defined. I ' The lateral extent of petroleum hydrocarbon-impacted ground water.is essentially defined; however; the vertical extent-has not been;defined in an apparently limited area between' ' borings B 17 and B 18 (Figure 5). . Y 5.0. RECOMMENDATIONS ; J , Based.on theresults of this investigation, AGE recommends: Performance.of additional assessment to delineate the vertical extent of TPH-g-impacted ground water.. , .Y ' • Preparation'of. a Corrective Action Plan (CAP),which includes feasibility analyses of remediation alternatives(e.g.,soil excavation;ozone sparging and bio-enhanced remediation- ' or attenuation) to determine appropriate clean-up method (s) for the site. -'- ' 6:0. LIMITATIONS '. Our professional services were performed using that degree of care and skill ordinarily exercisedby ' environmental consultants practicing.in this or-sirnilaf localities. The findings were based mainly upon.' analytical results provided.- by an independent laboratory: •Evaluations• of the geologic/hydrogeologic conditions at the site for the purpose'of this investigation were made from ` a limited!number of available data points (i.c. .soil and ground water samples), and subsurface conditions may vary away from these data points:No otheifwarranty; expressed or implied, is made as to the professional interpretations, opinions and recommendations contained in this-report. 1 41 1• ` ' ., .. Advanced GeoEnvironmental,Inc.