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Mr.Harlin Knoll December 8,2000 <br /> San Joaquin County Public Health Services Project No. 2007-0065-01 <br /> Environmental Health Division <br /> ' Page 4 <br /> presented in Appendix B and certified analytical reports and chain-of-custody <br /> documentation for air samples are included in Appendix C. <br /> The SVES has extracted a cumulative mass of 222.97 pounds (approximately 36 gallons <br /> of gasoline) quantified as TPHG from the subsurface. The mass extraction rates have <br /> decreased from 14.03 to 4.54, due to the decrease of influent TPHG concentrations. <br /> TPHG concentrations have decreased by approximately eighty percent (80%) since <br /> startup, correspondingly the flow rate into the catalytic oxidizer have been increased. <br /> The SVES is in compliance with the SJVUAPCD. Stratus will continue to optimize and <br /> maintain the SVES in the fourth quarter. <br /> CONCLUSIONS <br /> ' The highest concentrations of TPHG, TBA, MTBE, and benzene in groundwater were 1 <br /> detected in the sample collected from monitoring well S-1 and the highest concentrations <br /> of toluene, ethylbenzene, xylenes and TAME in groundwater were detected in the sample <br /> collected from monitoring well S-2. Dissolved phase petroleum hydrocarbons were also <br /> detected in the samples collected from monitoring wells MW-3 and MW-8. Groundwater <br /> flow direction was toward the south at an average gradient of 0.004. The SVES has <br /> extracted a cumulative mass of approximately 222 pounds of TPHG during the third <br /> quarter 2000. <br /> STATEMENT OF LIMITATIONS <br /> The services described in this report were performed consistent with generally accepted <br /> professional consulting principals and practices. No other warranty, expressed or <br /> implied, is made. These services were performed consistent with our agreement with our F <br /> client. This report is solely for the use of our client unless otherwise noted. Any reliance <br /> II on this report by a third party is at such party's sole risk. <br /> If you:have any questions, please contact Gowri Kowtha at (530) 676-6001. <br /> Sincerely, <br /> i <br /> STRATU5 ENVIRONMENTAL, INC. <br /> -� GoJ* Kowtha gaayW.�ohnson, <br /> Project Manager Principal Geologist <br /> C:Troject FilesWSA Gaso1in60651Qtr1y13Q00.doc 57RATUS <br /> E <br /> k <br />