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t r � rGETTLER - RYAN• INC. 7��S January 18, 2001 Mr Ed Ralston Tosco Marketing Company Environmental Compliance Department 1380 Lead Hill Road, Suite 120 Roseville, CA 95661 Subject Fourth Quarter 2000 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 October through December, 2000 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 iContinuous VES operation was stopped on November 3, 1998,due to low influent concentrations,but 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 Between September 28 and December 21,2000, the VES was "pulsed" three times for approximately 337 hours(14 0 days) The hour meter appears to have functioned normally during the October "pulse"event,but as a precaution was replaced prior to the November event VES samples were collected on six different occasions (October 25 and 30, November 28, and December 1, 15 and 21, 2000) Influent and effluent samples were analyzed for TPHg and BTEX at Sequoia Analytical (ELAP#1271 and 12360) In addition,the influent samples 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 fourth quarter 2000 Hydrocarbons were detected in one of the six effluent airstream samples Effluent concentrations of TPHg ranged from <2 0 to 24 6 milligrams per cubic meter(mg/m3) During the fourth quarter 2000 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 9160% to X99 00% Emission rates for TPHg ranged from <0 04 to 0 7 lb/day During the fourth quarter 2000, the VES. extracted and treated approximately 36 pounds of TPHg and <1 pound of benzene Since installation in September 1994, the VES has extracted and treated approximately 14,794 pounds of TPHg and 183 pounds of benzene VES analytical data for the quarter are summarized in Table 1,and operational data are summarized in Table 2 6747 Sierra Court , Suite J o Dublin , California 94568 a ( 925 ) 551 - 7555 140124 04