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> t I <br /> I <br /> -"COR <br /> STIE-4 <br /> July 27, 1995 internationallncorporated <br /> Mr Harland Knoll 95 JUL 31 PM 1: �� I <br /> I <br /> San Joaquin County Public, Health Service~ <br /> P O Box 2009 # <br /> Stockton, Calitornia 95201 <br /> RE REQUEST FOR SOIL VAPOR EXTRACTION SYSTEM MODIFICATION <br /> Former Econo Gas Station <br /> 4325 East Washington Street <br /> Stockton, Calitornia <br /> a <br /> Dear Mr Knoll <br /> SECOR International Incorporated (SECOR) is pleased to submit this request to modify the existing soil <br /> vapor extraction (SVE) System at the Former Econo Gas Station located at 4325 East Washington Street, <br /> Stockton, Calitornia (the Site) The existing SVE system currently includes a King Buck, Hasstech <br /> Model MMC-51315 Thermal Oxidizer (ThOx) SECOR is proposing to replace the ThOx unit with a <br /> vapor extraction (VE) blower anti vapor phase granular activated catbcm (GAC) canisters We believe <br /> this measure is appropriate based on the decreasing LonLentratiow, of total petroleum hydrocarbons as <br /> gasoline (TPHg) in the extracted all stream and the high cost cit operating the ThOx unit The <br /> concentrations of TPHg Have decreased trorn 33,000 milligrams per cubic meter (mglin') to 870 mg/m' <br /> from December 1992 to June 1995 The historic concentrations of TPHg in the extracted air stream are <br /> presented on Table 1 and are plotted versus time on Figure I The monthly utility costs including <br /> electriwty and natural gas to operate the Th Ox unit have averaged $2,100 <br /> SECOR has proceeded with a request to modify the existing San Joaquin Valley Unified All Pollution <br /> Control District (SJVUAPCD) Permit to Operate to include operation of a VE blower and GAC c-misters <br /> During the period of time required for the SJVUAPCD to process our application and for our client to <br /> procure the VE blower and GAC canisters, we request your appioval of a permanent shutdown of the <br /> ThOx unit <br /> I <br /> Upon receipt of your approval we will shutdown the ThOx unit In the interim, we will begin preparing <br /> the SJVUAPCD permit application and procuring the VE blower and GAC canisters It you have any E <br /> questions or need additional information please call us at (415) 882-1548 II <br /> f <br /> Sincerely, <br /> SECOR International InLorporated <br /> Jo n Bower R G <br /> Nan Bondr I <br /> Project Engineer nick Geologist <br /> i <br /> CL MS Linda Thompson, ConoLo, Inc <br /> Mr Fred Cruz SJVUAPCD <br /> Mr James Ritchie SECOR <br /> Attachment Table I - Suminai y of TPHg Concentrations <br /> Figuie 1 - TPHg Concentrations vs Time <br /> I <br /> 90 A'eu,A1ontgoinery Street Suite 620, San Francisco Ci 94105-45QJ (415)882-1548 14751882-4406 PAX I <br />