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1 <br />' 27 June 2002 <br /> . AGE-NC Project No. 98-0520 <br /> Page 8 of 8 <br /> • TPH-g and various BTEX compounds except benzene were detected in groundwater <br />' samples MW-1 through MW-5 and MW-9;only TPH-g was detected in water sample MW-8. <br /> All concentrations of these analytes were below California's Maximum Contaminant Levels <br /> for drinking water. <br />' • TBA was detected in MW-2 and MW-3 at concentrations as high as 300µg11,which exceeds <br /> the DHS drinking'water action level of 12 µg11;however, TBA was not detected in samples <br />' MW-4 and MW-5 for the first time over eight sampling events. <br /> 5:0. RECOMMENDATIONS <br />' Based upon data collected from the site, AGE recommends continued quarterly ground water <br /> monitoring.�One additional monitoring well was installed on 25 February 2002; the results will be <br /> included in the next quarterly monitoring report. <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities.The findings were based upon f eld <br /> ' . measurements and analytical results provided by an independent laboratory. Evaluations of the <br /> geologic/hydrogeologic conditions at the site for the purpose of this investigation are made from a <br /> limited number of available data points (i.e. soil and ground water samples) and subsurface <br /> ' conditions may vary away from these data points.No other warranty,expressed or implied,is made <br /> as to the professional interpretations, opinions and recommendations'contained in this report. . <br /> ' Advanced GeoEnvironmental,Inc., <br />