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. Second Quarter 1996 Status Report- Unocal Station No #69$1 <br /> August 9, 1996 <br /> thermal/catalytic oxidizer system. After destruction of the extracted petroleum <br /> hydrocarbons, the vapor stream is discharged to the atmosphere The VES operated in <br /> thermal mode from startup in September 1994 until January 1995, when it was shut down <br /> and switched to catalytic mode. The system was restarted in catalytic mode on May 16, <br /> 1995, but could not meet permit discharge conditions and was shut down on May 23, 1995 <br /> to evaluate the catalyst. A new catalyst was installed and the system restarted on <br /> December 19, 1995. Historical VES chemical analytical data are summarized in Table 1, <br /> and historical VES operational data are summarized in Table 2 <br /> CURRENT QUARTER'S ACTIVITIES <br /> Field activities conducted at the subject site during the second quarter 1996 are discussed <br /> below. <br /> Morutonng and Sampling of Groundwgter Monitoring Wells <br /> Groundwater monitoring wells were monitored and sampled by MPDS Services, Inc <br /> (MPDS)on April 25, 1996 Based on measurements collected by MPDS, the groundwater <br /> beneath the site appears to flow to the northeast at an approximate gradient of 0 003 <br /> (consistent with previous data) The groundwater table was approximately 4 7 feet higher <br /> than the previous quarter <br /> All groundwater monitoring wells at the site (MW-1 through MW-13) are sampled on a <br /> semi-annual basis, during the first and third quarters Only the perimeter wells MW-6 and <br /> MW-9 through MW-13 are sampled on a quarterly basis. During the second quarter 1996, <br /> Total Petroleum Hydrocarbons as gasoline (TPHg), Methyl Tertiary Butyl Ether (MTBE), <br /> or Benzene, Toluene, Ethylbenzene, and total Xylenes (BTEX) were not detected in <br /> groundwater samples from perimeter wells MW-6 and MW-9 through MW-13 <br /> The Quarterly Data Report dated May 29, 1996 was submitted by MPDS to the San <br /> Joaquin County Public Health Services (SJCPHS) and California Regional Water Quality <br /> Control Board (CRWQCB). <br /> VES Operation <br /> The VES effluent vapor stream was sampled by Gettler-Ryan Inc (G-R) on April 23, May <br /> 28, and June 25, 1996 The samples were analyzed for TPHg and BTEX at Sequoia <br /> Analytical (Sequoia) in Redwood City, California (FLAP #1210). Copies of the Sequoia <br /> reports and chain-of-custody documents are presented in Appendix B <br /> 4955 02-9 2 <br />