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t <br /> i <br /> a <br /> k T. <br /> � 6ETTLER - RYAN INC. <br /> April 28, 1998 <br /> Mr Ed Ralston <br /> Tosco Marketing Company <br /> Environmental Compliance Department <br /> 2000 Crow Canyon Place, Suite 400 <br /> San Ramon, California 94583 <br /> Subject First Quarter 1998 VES Report, Tosco 76 Branded Station No. 6981, 4707 <br /> Pacific Avenue, Stockton, California. <br /> Mr Ralston <br /> This report summarizes the sampling and operational data for the vapor extraction system (VES) <br /> at the subject site from January through March, 19987 The VES operates under San Joaquin <br /> Valley Unified Air Pollution Control District Permit N-3335-2-0 Location of the subject site is <br /> shown on Figure 1 The current station configuration is shown on Figure 2 <br /> • First Quarter 1998 Activities <br /> Field activities related to the operation and maintenance of the VES conducted at the subject site <br /> during the first quarter 1998 are discussed below Gettler-Ryan Inc (GR) Field Methods and <br /> Procedures are attached <br /> Between December 29, 1997, and March 25, 1998, the VES operated approximately 1,980 hours <br /> (83 days), or 96% of the time GR monitored the system on a bi-weekly basis, and collected <br /> influent and effluent vapor stream samples on January 29, February 27, and March 25, 1998 <br /> These samples were analyzed for TPHg and BTEX at Sequoia Analytical in Redwood City, <br /> California (FLAP #1210) Copies of the laboratory reports and chain-of-custody documents are <br /> attached <br /> Soil vapor was extracted from wells VW-2, VW-4, and VW-5 during the first quarter 1998, as field <br /> monitoring indicated these wells had the highest hydrocarbon concentrations Wells VW-3 and <br /> VW-6 were also opened between February 27 and March 25, 1998 During the first quarter 1998, <br /> the VES extracted and treated approximately 1,261 pounds of TPHg and 4 pound of benzene <br /> Since installation in September 1994, the VES has extracted and treated approximately 13,434 <br /> pounds of TPHg and 173 pounds of benzene VES analytical data for the quarter are summarized <br /> in Table 1, and operational data are summarized in Table 2 <br /> Hydrocarbons were not detected in the effluent airstream sample collected on January 26 or <br /> • February 27, 1998 The effluent sample collected on March 25, 1998, contained 4 parts per <br /> 140124 02 <br /> 6747 Sierra Court , Suite J o Dublin , California 94568 0 ( 925 ) 551 - 7555 <br />