Laserfiche WebLink
Mr.Harlin Knoll July 31,2002 <br /> San Joaquin County Public Health Services Project No. 2007-0065-01 <br /> Page 4 <br /> Analytical for analysis. Certified analytical reports and chain-of-custody documentation <br /> for air samples are included in Appendix C. <br /> On May 7, 2002, additional air samples were collected from wells MW-8, S-1, S-2, and <br /> VW-1 to evaluate the petroleum hydrocarbon concentrations in soil vapors extracted <br /> from these wells. TPHG and MTBE were detected in air samples collected from wells <br /> MW-8, S-2 and VW-1. The highest TPHG and MTBE concentrations were observed in <br /> the sample collected from well MW-8. Xylenes were detected in the samples collected <br /> from S-2 and VW-1 at 3.78 mg/M3 and 1.75 mg/m3, respectively. Petroleum <br /> hydrocarbons were not detected in the sample collected from well S-1. <br /> The SUES extracted approximately 133 pounds of TPHG during the second quarter 2002, <br /> and has extracted a cumulative mass of approximately 3,457.10 pounds of TPHG since <br /> startup. The SVES is in compliance with the SJVUAPCD. Stratus will continue to <br /> operate and maintain the SVES on a pulse mode, with two weeks of operation and two <br /> weeks of shutdown, to optimize the extraction rate during the third quarter 2002. <br /> CONCLUSIONS <br /> Concentrations of petroleum hydrocarbons and fuel oxygenates in groundwater are <br /> generally consistent with previous sampling events. Groundwater flow direction is <br /> towards the south-southeast at an average gradient of 0.001 ft/ft. Petroleum <br /> hydrocarbons were below laboratory detection limits in the sample collected from offsite <br /> downgradient well MW-7 during the second quarter 2002. The SVES extracted <br /> approximately 133 pounds of TPHG during second quarter 2002. <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 <br /> client. This report is solely for the use of our client unless otherwise noted. Any reliance <br /> on this report by a third party is at such party's sole risk. <br /> PAUSA Gasoline100651Qtrly120021USA_65_2Q02.doc 5TRA rus <br />