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1 <br /> 6ETTLER - RYAN INC. <br /> i <br /> April 26, 2000 <br /> Mr Ed Ralston <br /> Tosco Marketing Company <br /> Environmental Compliance Department <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, CA 9566t <br /> Subject First Quay ter 2000 VES Report, Tosco 76 Branded Station No 6981, 4707 Pacific Avenue, Stockton, <br /> California <br /> Mr Ralston <br /> This report summarizes the sampling and operational data for the vapor extraction system (VES) at the subject site from <br /> January through March, 2000 The VES operates under San Joaquin Valley Unified Air Pollution Control District <br /> (SJVUAPCD) Permit N-3335-2-0 Location of the subject site is shown on Figure I The current station configuration is <br /> shown on Figure 2 GR sampling procedures are attached <br /> Continuous VES operation was stopped on November 3, 1998,due to low influent concentrations,but has operated in "pulse" <br /> mode since Between December 16, 1999, and March 21, 2000, the VES operated approximately 402 hours (16 8 days), <br /> or 17% of the time GR monitored the system and collected influent and effluent vapor stream samples on January 28 and <br /> 31,February 23, and March 1, 14,and 21, 2000 Samples were analyzed for TPHg and BTEX at Sequoia Analytical(ELAP <br /> #1271, 1624, and 2360) In addition, the influent samples were analyzed for MtBE Copies of the laboratory reports and <br /> chain-of-custody documents are attached <br /> Soil vapor was extracted from all vapor wells when pulsed during tiie first quarter 2000 Hydrocarbons were detected in <br /> four of the six effluent airstream samples Effluent concentrations of TPHg ranged from <2 6 to 7 4 parts per million <br /> vapor During the fourth quarter 1999 operational period,the VES operated within the permit requirement of 95% or greater <br /> destruction efficiency or <2 pounds TPHg per day (lb/day)emission rate VES destruction efficiencies during this period <br /> ranged from 90 00% to l00 00% Emission rates for TPHg ranged from 0 3 to 0 9 lb/day During the first quarter 2000, <br /> the VES extracted and treated approximately 75 pounds of TPHg and 1 pound of benzene Since installation in September <br /> 1994, the VES has extracted and treated approximately 14,747 pounds of TPHg and 183 pounds of benzene VES analytical <br /> data for the quarter are summarized in Table 1, and operational data are summarized in Table 2 <br /> If you have questions, please call us in Sacramento at(916) 631-1300 <br /> Sincerely, <br /> Gettle -Ryan Inc <br /> tep en J arter, R <br /> Senior Geologist <br /> Attachments Table I - Summary of VES Chemical Analytical Data <br /> Table 2 - Summary of VES Operation <br /> Figure 1 Vicinity Map <br /> Figure 2 Site Pian <br /> Field Methods and Procedures <br /> VES Chemical Analytical Data and Chain-of-Custody Forms <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 X925 } 551 -7555 <br /> 140124 04 <br />