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C (Ogical Technics Inc, Page 5 <br /> George's Service <br /> Soil Excavation Report <br /> Project No 425 3 <br /> January 28,2002 <br /> ' 4 The rock backfill material is very permeable and should increase oxygen levels in the <br /> subsurface The increased amount of oxygen in the subsurface should expedite the rate <br /> ' of natural attenuation of the remaining contaminants <br /> Recommendations <br /> 1 Continue quarterly groundwater monitoring in an effort to quantify the results of the soil <br /> excavation <br /> 2 Connect a small bio-venting/vapor extraction system, blower and carbon, to the two <br /> extraction pipes that were installed in the backfill material This system would serve <br /> several purposes <br /> • Active removal of vapor phase contaminants that will be sorbed to the backfill <br /> material during the seasonal groundwater fluctuation <br /> ' • Introduce more oxygen into the subsurface to aid in natural attenuation <br /> ' SA SIGNATURES AND CERTIFICATION <br /> This project was perforined by Geological Technics Inc in accordance with accepted <br /> geologic and hydrologic standards of the State of California accepted and in effect at the <br /> ' time of this investigation Geological Technics Inc is not responsible for undisclosed <br /> conditions <br /> This report was prepared by <br /> 1 <br /> Nricliael J iemi <br /> Geologist .ESStp���o <br /> ' Raynold I Kablanow 11, Ph D <br /> California Registered Geologist #5234 slglFO �A���o�� <br /> California Certified Hydrogeologist #442 <br />