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FROM AGE NC 209 956 0700 P 3 <br /> 2 o February 1997 <br /> AGE-NC Project No. 95-0112 <br /> Fage 2 of Z <br /> a draft report.The report will include mass Balance calculations for petroleum Hydrocarbons <br /> in soil. Final reporting will be included in the Quarterly Report April 1997. <br /> 24. Modeling will be iperformedto determine what risk,if any,remaining hydrocarbons in the <br /> . vadose zone pose to-ground water: <br /> r5. A revised laboratory report for soil samples collected during the July 1996 probing event has <br /> been issued by the laboratory. The revised report, requested QA/QC data sheets and <br /> k, chromatograms are included in the Quarterly-Report-January 1997. The revised data will <br /> be incorporated with soil data tabulated for the draft.report. <br /> -6. QA/QC:data sheets for water samples collected in July and October 1996 will be included <br /> in the Quarterly.Report-January 1997. <br /> 7. On 07 February 1997,operation of the in-situ air sparging unit was discontinued. Operation j <br /> of the vapor extraction system was continued until 26 February 1997..,:, <br /> 9. Due to the Iow concentrations of extracted hydrocarbons,agreement was reached between <br /> 1 the PHS-EHD and AGE to discontinue use of the IC engine vapor extraction unit. The use <br /> of a regenerative'blower/carbon canister system was discussed: The necessity and cast <br /> effectiveness of installation of a blower/carbon unit will be evaluated after analytical data <br /> from the 26 February 1997 assessment.is available: <br /> 9. The advancement of one additional probing, most likely located south of MW-1, was <br /> discussed. However,the necessity and actual location for this probing will be evaluated after <br /> analytical results of soil samples collected during theFebruary 1997 probing have been <br /> reviewed. <br /> if you have any questions or'require further information,.please contact our office at(209)956-0264. <br /> Sincerely, <br /> Advanced GeoEnvironmentak Inc. <br /> Kevin McKibben <br /> Senior Staff Geologist <br /> cc: Ms. Mary Lehr <br /> Mr.James DeMera,Esq. - Mullen. Sullivan&Newton <br /> 3 <br /> 3 <br />