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C. ' 6ETTLER - RY AN 1� • January 21, 2000 Mr Ed Ralston Tosco Marketing Company Environmental Compliance Department 1380 Lead Hill Road, Suite 120 RoseviIIe, CA 95661 Subject: Fourth 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 September through December, 1999 The VES operates under San Joaquin Valley Umfied Air Pollution Control District (SJVUAPCD) Permit N-3335-2-0 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 September 20 and December 16, 1999,the VES operated approximately 216 hours(9 0 days),or 10% of the time GR monitored the system and collected influent and effluent vapor stream samples on October 26 and 29, November 16 and 19, and December 13 and 16, 1999 Samples were analyzed for TPHg and BTEX at Sequoia Analytical (ELAP##1271) In addition, the influent samples were analyzed for MtBE Copies of the laboratory reports and cham-of- custody documents are attached Soil vapor was extracted from all vapor wells when pulsed during the fourth quarter 1999 Hydrocarbons were detected in all effluent airstream samples Effluent concentrations of TPHg ranged from C 2 6 to 156 parts per mullion vapor During the fourth quarter 1999 operational period, the VES operated within the permit requirement of 95% or greater destruction efficiency or C2 pounds TPHg per day (lb/day) emission rate, except for the sample collected October 26, 1999 VES destruction efficiencies during this period ranged from 6101%, to 96 50% Emission rates for TPHg ranged from 0 2 to 1 8 lb/day except for the sample collected October 26, 1999, when the emission rate was 7 6 lb/day As required, this permit violation was reported to SJVUAPCD in a letter dated November 11, 1999 In a telephone conversation on November 30, 1999, SJVUAPCD indicated there would be no action taken for this violation During the fourth quarter 1999,the VES extracted and treated approximately 85 pounds of TPHg and 2 pound of benzene Since installation in September 1994, the VES has extracted and treated approximately 14,672 pounds of TPHg and 182 pounds of benzene VES analytical data for the quarter are summarized in Table 1, and operational data are summarized in Table 2 If you have questions, please call us in Sacramento at (916) 631-1300 Sincerely, ;Aettr-Ryan Inc. Stephen J Ca r, R G Senior Geologist Attachments Table 1 - Summary of VES Chemical Analytical Data . Table 2 - Summary of VES Operation Figure 1 Vicinity Map Figure 2 Site Plan Field Methods and Procedures VES Chemical Analytical Data and Cham-of-Custody Forms 6747 Sierra Court , Suite J o Dublin , California 94568 ( 925 ) 551 -7555 14012404