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1-010, <br /> ` 26 February 1996 <br /> AGE-NC Project No. 95-0152 <br /> ` Page 6 of 6 <br /> remaining hydrocarbons from 15 feet bsg to 40 feet bsg. Hydrocarbon-impacted soil volume <br /> assumptions and calculations are included as Appendix D. <br /> Based upon data collected during investigation of the former UST area, it appears that approximately <br /> 16.96 gallons of gasoline is still present at 5 feet bsg to 15 feet bsg, with residual hydrocarbons <br /> present at 15 to 40 feet bsg at the site. Since ground water depth at the site is in excess of 75 feet bsg, <br /> it is unlikely that this small volume of hydrocarbons remaining in soil poses a significant threat to <br /> ground water. <br /> The stockpiled soil should be aerated in accordance with San Joaquin County Air Pollution Control <br /> District(SJCAPCD)guidelines. Upon completion of aeration procedures and confirmation sampling, <br /> we recommend site closure for the former UST area. <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 mainly upon <br /> analytical results provided by an independent laboratory. Evaluations of the geologic/hydro geologic <br /> conditions at the site for the purpose of this investigation are made from a limited number of available <br /> data points(i.e., soil samples) and subsurface conditions may vary away from these data points. No <br /> other warranty, expressed or implied, is made as to the professional recommendations contained in <br /> this report. <br />