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6ETTLER - RYAN INC. July 23, 2001 Mr Ed Ralston Tosco Marketing Company Environmental Compliance Department 1380 Lead Hill Road, Suite 120 Roseville, CA 95661 Subject:Second Quarter 2001 VES Report,Former Tosco 76 Branded Station No. 6981,4707 Pacific Avenue, Stockton, California. Mr Ralston This report summarizes the sampling and operational data for the vapor extraction system (VES) at the subject site from January through March 2001 The VES operates under San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) Permit N-3335-2-0 Location of the subject site is shown on . Figure 1 All aboveground and underground facilities associated with the former station except for the VES were removed during the second quarter 2000 The former station configuration is shown on Figure 2 GR sampling procedures are attached The VES operated continuously until it was stopped on November 3, 1998, due to low influent concentrations, and has operated in"pulse" mode since The VES was not operated in April through July 2000 due to station demolition activities and re-routing of the VES electrical line Pulse mode operation resumed on August 16, 2000 In March the mechanical blower failed and was removed and shipped for repair During the inspection prior to the rebuild, it was discovered that the blower could not be repaired to the required specifications, and it was deemed non-repairable After receiving approval from Tosca, a new blower was ordered The new blower was installed on June 21, 2001 and after the unit reached operating temperature, the system was sampled and left operating However, upon returning on July 2, 2001, it was discovered that the unit had shut down The system was restarted, sampled and shutdown, continuing operation in the pulse mode Influent and effluent samples were analyzed for TPHg and BTEX at Sequoia Analytical (ELAP#1624) In addition, the influent samples were analyzed for MtBE Copies of the laboratory report and chain-of- custody document are attached Soil vapor was extracted from all vapor wells when pulsed during the second quarter 2001 Hydrocarbons were not detected in either of the influent or effluent airstream samples During the second quarter 2001 operational period, the VES operated within the permit requirement of 95% or greater destruction efficiency or <2 pounds TPHg per day(lb/day) emission rate VES destruction efficiencies during this 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555