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COPY <br /> 1) ENVIRONMENTAL INC 3330 Cameron Park Drive Ste 550 <br /> Cameron Park California 95682 <br /> (530)676-6004-Fax (530)676-6005 <br /> November 9, 2004 <br /> Project No U6100-16-9 <br /> RECEWEL)i <br /> Mr Craig Mitchell NOV 18 2004 <br /> San Joaquin Valley <br /> Air Pollution Control District �� <br /> 230 Kiernan Avenue, Suite 130 <br /> Modesto, California 95356-9321 <br /> Re Soil Vapor Extraction System <br /> Facility No N-5026 <br /> ARCO Station No 6100 <br /> 25775 South Patterson Pass <br /> Tracy, California <br /> Dear Mr Mitchell <br /> Stratus Environmental, Inc (Stratus) has prepared this letter, on behalf of Atlantic <br /> Richfield Company (ARCO- a BP Affiliated Company), to follow-up on our conversation <br /> of November 8, 2004, and to notify the San Joaquin Valley Air Pollution Control District <br /> (SJVAPCD) regarding the exceedance in emission rates for gasoline range organics <br /> (GRO) for the soil vapor extraction system (SVE, serial number 9230) operated at ARCO <br /> Station No 6100, located at 25775 South Patterson Pass Road, Tracy, California <br /> Dunng a routine site visit on November 4, 2004, a Stratus technician recorded a photo- <br /> ionization detector (PID) reading of 47 parts per million by volume (ppmv) in the effluent <br /> air sample To verify system destruction efficiency and to estimate mass emission rates, <br /> Stratus collected a set of influent and effluent air samples on November 4, 2004, and <br /> shutdown the SVE system These air samples were forwarded to a state-certified <br /> laboratory for chemical analysis on a 24-hour turn-around time <br /> The reported GRO concentration in the effluent air sample collected on November 4, <br /> 2004, was 160 milligrams per cubic meter (mg/m3, 46 ppmv) Based on the system <br /> influent flow rate of 202 93 actual cubic feet per minute (acfm) recorded on November 4, <br /> 2004, the GRO mass emission rate was calculated to be approximately 2 92 pounds per <br /> day (lbs/day) The destruction efficiency of the SVE system was calculated to be <br /> approximately 84 percent Copies of field data sheets are presented in Appendix A <br /> Copies of certified analytical reports with chain-of-custody documentation are presented <br /> in Appendix B The computation sheets with detailed calculations for GRO mass <br /> emission rates and destruction efficiency for the SVE system are presented in <br /> iAppendix C <br /> P 1Bp-Arco for URS16I001CorrespondeacclARCO 6100 SVE Mass Exceedance Letter doc <br />