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13 February 1998 <br /> AGE-NC Project No 97-0312 <br /> Page 4 of 4 <br /> Based upon data collected from the site, AGE concludes the following <br /> G During the December 1997 monitoring event,the ground water level was within the screened <br /> Interval for the foul monitoring wells sampled <br /> G TPH-d was detected in each monitoring well sampled at concentration', as high as 144 ppb <br /> TPH-g, BTE&X, MTBE and volatile organic compounds were not detected in samples <br /> collected from monitoring wells UST-2, UST-3 or UST-4, or from the domestic wells <br /> Concentrations of TPH-g and TPH-d decreased in UST-5, the concentration of benzene <br /> Increased slightly in UST-5 <br /> O The concentrations of benzene and DCA in UST-5 were above the State of California <br /> drinking water Maximum Contaminant Level (MCL) during the December 1997 monitoring <br /> I event <br /> 5.0. RECOMMENDATIONS <br /> Based upon data obtained from the site, AGE recommends the following <br /> a Dispose of Impacted stockpiled soil and backfill excavation ppp <br /> upon rex ioNal of cost <br /> p <br /> estimates from the UST cleanup fund Soil disposal and excavation backfilling will be <br /> performed in accordance with the 12 December 1997 report titled Soil Stockpile Sampling <br /> and Backfilling of Excai inion, prepared by AGE <br /> C AGE anticipates that further assessment of the extent of impacted soil \Hill be required by the <br /> PHS-EHD Therefore we recommend preparation of a work plan to fully assess impacted <br /> soil at the site <br /> V Schedule the neat quarterly monitoring event for March 1998 The five monitoring wells at <br /> the former UST location ,Nill be sampled at that time <br /> 50 <br /> 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 mainly <br /> upon analytical results provided by an independent laboratory Evaluation of the <br /> geologic/hydrogeologic conditions at the site for the purpose of this investigation was made from <br /> a limited number of available data points (r e ground water samples, soil 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 recommendations contained in this report <br /> Adngirced CeoEn+rronmental,Inc <br />