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Npoe ,00 <br /> 05 December 2005 <br /> AGE-NC Project No. 95-0184 <br /> Page 2 of 2 <br /> greater or near 100,000 micrograms per liter and benzene has been detected generally at <br /> concentrations above 2,000 µg/1 and typically above 20,000µg/1.These concentrations are <br /> near or above dissolved solubility levels for the typical c9mpounds and demonstrate that the s �Y <br /> /W well s,,contamination is soil sourced and may not thrtrue dissolved concentration.—' <br /> • Within set of data collected from the available wells installed, adequate data exists to ,)� <br /> demonstrate the dissolved plumes topology and intensity without egtlarly,repeatable <br /> sampling.However,the installation and sampling of down gradien ulti-de th wel s would <br /> aide in modeliM and configuring the extent of the dissolved hydrocaz ons that were <br /> detected throu„gh grab ground water sampling,at exceptional distances away from the UST <br /> areas(CPTs off-site). - - <br /> • Based on the need to understand and document any change in the'WW well etwork and <br /> document an annual trend of exceptionally high concentrations of disi-61V-e-d hydrocarbons <br /> in the VW well network and conserve resource funding allocation,AGE propos sa quarterl S <br /> samp ling ofMW wells and annual sampling of VW wells (fough quarte . The anaical h <br /> protocol should only includc a full scan by EPA MethodRW-nually for eackwe 1 network.- <br /> etwork.- <br /> TPH/-B-TF7X and fuel additives should be analyzed contirlpainstalle <br /> lly. Additionally d <br /> monitoring wells should be sampled quarterly. TT d <br /> Ifyou have any questions or require further information,please contact our office at(209)467-1006. <br /> Sincerely, <br /> Advanced GeoEnvironmental, Inc. s\� <br /> 1*1 Na. 7473 <br /> William R. Little / <br /> Senior Project Geologistgrr <br /> California Professional Geologist 7473 <br /> cc: Mr. Charles Skobrak <br />