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? h 6ETTLER - RYAN INC. July 16, 1999 Mr Ed Ralston Tosco Marketing Company Environmental Compliance Department 1380 Lead Hill Road, Suite 120 Roseville, CA 95661 Subject Second Quarter 1999 VES Report, 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 April . through June, 1999 The VES operates under San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) Permit N-3335-2-0 On June 1, 1999, Gettler-Ryan Inc (GR) submitted a request to the SJVUAPCD to extend this permit through the year 2001 Location of the subject site is shown on Figure 1 The current station configuration is shown on Figure 2 GR sampling procedures are attached Continuous VES operation was stopped on November 3, 1998,due to low influent concentrations,but has operated in"pulse" mode since Between March 26 and June 21, 1999, the VES operated approximately 159 hours(6 6 days), or 0 5% of the time GR monitored the system and collected influent and effluent vapor stream samples on April 20 and 23, May 24 and 26,and June 19 and 21, 1999 Samples were analyzed for TPHg and BTEX at Sequoia Analytical(ELAP 111271 and#1624) In addition, the influent samples collected during May and June were analyzed for MtBE Copies of the laboratory reports and chain-of-custody documents are attached Soil vapor was extracted from all vapor wells when pulsed during the second quarter 1999, except for the June pulsing when only wells VW-3 and VW-6 were used Hydrocarbons were detected in all effluent airstream samples Effluent concentrations of TPHg ranged from 11 to 25 parts per million vapor However,during the second quarter 1999 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 period ranged from-42 64%to 99 47% Emission rates for TPHg ranged from 0 5 to 1 6 lb/day During the second quarter 1999, the VES extracted and treated approximately 33 pounds of TPHg and 1 pound of benzene Since installation in September 1994, the VES has extracted and treated approximately 14,442 pounds of TPHg and 177 pounds of benzene VES analytical data for the quarter are summarized in Table 1, and operational data are summarized in Table 2 Influent samples collected during the May and June 1999 were also analyzed for MtBE Concentrations ranged from 200 to 357 milligrams per cubic meter(mg/m) Vapor samples were also collected from wells VW-3 and VW-6 on April 23, 1999 Well VW-3 contained TPHg(59 mg/m3)and MtBE(330 mg/m3), but did not contain BTEX compounds Well VW-6 0 contained TPHg (110 mg/m3), benzene (0 35 mg/m3), and MtBE (160 mg/m3), but did not contain toluene, ethylbenzene or xylcnes 140124 04 6747 Sierra Court , Suite J o Dublin , California 94568 ( 925 ) 551 - 7555