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Unocal #6981 July 27, 1995 the VES was operating within permit conditions and with the approval of SJVUAPCD the VES continued to operate. Collected vapor stream samples were submitted to the Sequoia Analytical laboratory located in Sacramento, California (ELAP #1624) Samples were analyzed for TPHg and Benzene, Toluene, Ethylbenzene, and total Xylenes (BTEX) by EPA Methods 50301801518020 Chemical analytical results for the VES influent and effluent vapor stream samples are summarized in Table 1 The VES Operation and Emissions Data are summarized in Table 2 Copies of the Sequoia Analytical Laboratory reports and chain-of-custody forms are included in Appendix C The TPHg destruction efficiency was 93 29%, and the TPHg emission rate was 8 41 pounds per day (lb/day) Upon receipt of the analytical data and calculating the TPHg efficiency and mass emission rate, the VES was shut down on May 23, 1995 because the required destruction efficiency of 95% was not met However, the mass emission rate was less than the maximum of 9 7 pounds per day SJVUAPCD was notified that the VES did not meet the permit condition for the destruction efficiency and the VES was shut down for evaluation During May and June 1995, several attempts were made to meet the required destruction efficiency by changing the VES operating parameters However, the VES could not meet the required 95% destruction efficiency The VES was shut down after each attempt THIRD QUARTER 1995 ACTIVITIES In an attempt to meet the required destruction efficiency, the LEL and temperature controllers and motor drives will be replaced in July 1995 A source test will be scheduled with SJVUAPCD after demonstrating that the VES can meet the required permit conditions After completion of a successful source test, the VES will continue to operate and monthly sampling will be performed to ensure permit conditions are met Because of the numerous wells, the cost associated with sampling all the wells each quarter, and the substantial reduction of TPHg and benzene concentrations from the monitoring wells over the past two years, GSI proposes to modify the current quarterly groundwater monitoring and sampling program for this site During the first and third quarters, each well (MW-1 through MW-13) will be monitored and sampled During the second and fourth quarters, each well will be monitored and the perimeter wells MW-6, MW-9, MW-10, MW-11, MW-12, and MW-13 will be sampled This work will be performed by MPDS and the Quarterly Data Reports will continue to be submitted to the 495502-4 3