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TEXACO ENVIRONMENT, HEALTH & SAFETY <br /> SOIL VAPOR EXTRACTION OPERATION REPORT <br /> 440 West Charter Way <br /> Stockton, California <br /> Consultant SECOR International Incorporated <br /> Reporting Agency San Joaquin Valley Unified Air Pollution Controlt District <br /> Reporting Period April 1 -June 30, 1997 <br /> System Equipment AKI SYSTEMS,INC.Thermal Oxidation,4 dual-completion extraction wells, <br /> 25 HP blower <br /> Operating Mode Thermal Oxidation <br /> Permit# N-3139-1-0 <br /> LABORATORY DATA (mg/M3) <br /> PROCESS INFLUENT SUMMARY(') 21 Apr 97 12 May 97 10 Jun 97 <br /> TPHg(2) 410 710 820 <br /> Benzene ND(O 16) ND(O 2) ND(O 4) <br /> Toluene NC3 4 7 7 7 <br /> Ethylbenzene 17 2 3 8 <br /> Xylenes 39 22 16 <br /> LABORATORY DATA (mg/M3) <br /> PROCESS EFFLUENT SUMMARY 21 Apr 97(2) 12 May 97 10 Jun 97 <br /> TPHg 12 ND(10) ND(10) <br /> Benzene 022 ND(O 2) ND(O 2) - <br /> Toluene 1 I ND(0 2) ND(O 2) <br /> Ethylbenzene 022 ND(a 2) ND(O 2) <br /> Xylenes NCI 3 027 ND(O4) <br /> OPERATING EFFICIENCY Apr 97 May 97 Jun 97 <br /> Average unlet temperature (°F) 893 841 92 <br /> Average outlet temperature (°F) 1003 1006 1116 <br /> Average inlet flow rate (scfin) 30 30 39 <br /> TPHg emission rate (lbs/day) 025 0 0 <br /> TPHg effluent permit limit 2 lbs/day <br /> TPHg destruction efficiency 99% 100% 100% <br /> Benzene destruction efficiency 0% 0% 0% <br /> Total TPHg removed this period 86 lbs <br /> Cumulative TPHg removed(') 6,071 lbs <br /> % Operation this period 86% <br /> . (1)Analyzed by VOC Analytical Laboratory using modified DHS Method for TPHg and EPA Method 8020 for BTEX <br /> (2)Total Petroleum Hydrocarbons as Gasoline <br /> (3)Cumulative TPHg is based on TPHg removal since system Mutup by SECOR in January 1996 <br /> ND=Not Detected at or above the laboratory detection limit represented in parenthesis <br /> mgW=milligrams per cubic Meter NC=Not Confirmed within 25% <br /> TES1sioc1d0'VdMvy297 tbl <br />