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r1 \ �i � 6ETTLER - RYAN INC. October 30, 2000 Mr Ed Ralston Tosco Marketing Company Environmental Compliance Department 1380 Lead Hili Road, Suite 120 Roseville, CA 95661 Subject: Third Quarter 2000 VES Report, Former Tosca 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 July through September,2000 The VES operates under San Joaquin Valley Unified Au Pollution Control District(SJVUAPCD) Permit N-3335-2-0 Location of the subject site is shown on Figure I 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 Continuous VES operation was stopped on November 3, 1998,due to low influent concentrations,but has operated in"pulse" mode since Due to station demolition activities the VES was not operated during the second quarter 2000 In our report for the second quarter 2000 we reported that installation of the new electrical service to the VES was completed on July 12, 2000 This was based on information supplied to GR by Tosco's contractor However, GR was at the site on July 26,2000, and at that time, Pacific Gas and Electric had not completed their new electrical drop and installed the new power meter on the electrical panel GR personnel returned to the site on August 16, 2000 to restart the VES Between August 16 and September 28, 2000, the VES was "pulsed" for approximately 440 hours (18 3 days) The VES was restarted on August 16,but only ran approximately 8 hours before shutting down GR restarted the VES on August 21, and it ran continuously (240 hours) until August 31, when GR shut the VES down The hour meter appears to have malfunctioned, as it indicates the runtime for this period at only 77 hours GR "pulsed" the VES again between September 20 and September 28 (192 hours) Again the hour meter appears to have malfunctioned, indicating only 53 hours of operation VES samples were collected on five different occasions(August 16,21 and 31,and September 21 and 31,2000) influent and effluent samples were analyzed for TPHg and BTEX at Sequoia Analytical (ELAP #1271 and 1624) 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 third quarter 2000 Hydrocarbons were detected in four of the six effluent airstream samples Effluent concentrauons of TPHg ranged from <2 0 to <10 0 milligrams per cubic meter (mg/in) During the third 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 90 00% to 100 00% Emission rates for TPHg ranged from <0 05 to <12 lb/day During the third quarter 2000, the VES extracted and treated approximately 9 pounds of TPHg and installation in September 1994, the VES has extracted and treated approximately 14,758 pounds of TPHg and 183 pounds 0 of benzene VES analytical data for the quarter are summarized in Table 1,and operational data are summarized in Table 2 i 6747 Sierra Court , Suite J • Dublin , California 94568 • ( 925 ) 551 - 7555 140I24 04