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C(DPY9 n r T 2 4 2003 <br /> t -NT HEALTH <br /> ENVIRONMENTAL INC 3330 Cameron Park Drive Ste 550 <br /> ; VICES Cameron Park, California 95682 <br /> (530)676-6004--Fax (530)676-6005 <br /> October 22, 2003 <br /> Project No U6100-17-2 <br /> Mr Fred Cruz <br /> San Joaquin Valley <br /> Air Pollution Control District <br /> 230 Kiernan Avenue, Suite 130 <br /> Modesto, California 95356-9321 <br /> Re Addendum to Authority to Construct Application (N-1031677) <br /> ARCO Station No 6100 <br /> 25775 South Patterson Pass <br /> Tracy, California <br /> Dear Mr Cruz <br /> Stratus Environmental, Inc , (Stratus) has prepared this letter, on behalf of Atlantic <br /> Richfield Company (ARCO), to provide additional information requested by San Joaquin <br /> Valley Air Pollution Control District (SJVAPCD) towards the completion of the <br /> application for authority to construct soil vapor extraction and abatement (SVE) systems <br /> at ARCO Station No 6100, located at 25775 South Patterson Pass, Tracy, California <br /> During September 2003, Stratus prepared and submitted an application to SJVAPCD <br /> requesting an authority to construct (ATC) and permit to operate (PTO) two (2) King, <br /> Buck & Associates, Inc , 200 cubic feet per minute (cfin) MMC-6A/E catalytic oxidizers <br /> (Serial Nos 9321 and 9230) with 7 5 horsepower (hp) rated blowers Upon review of <br /> this application, SJVAPCD requested additional information regarding the annual mass <br /> emissions for volatile organic compounds (letter dated October 7, 2003) <br /> This letter provides further clarification regarding the operation of the proposed <br /> remediation systems and addresses concerns and questions identified by SJVAPCD As <br /> we discussed, based on a flow rate of 150 cfm and an influent soil vapor concentration of <br /> 160,000 mg/m3, the emission rate for each catalytic oxidizer is estimated to be 39,351 <br /> lbs/year (108 lbs/day) at 95% efficiency We understand that these estimated emission <br /> rates are required to be less than 20,000 lbs/year This calculation is conservative as it <br /> assumes that the concentration of influent soil vapors is going to be constant, and flow <br /> rate is going to be at 150 cfm Actual operating conditions may be different, as <br /> concentrations may be lower and flow rate can be adjusted based on the destruction <br /> efficiency of the system <br /> The mass extraction and emission calculations presented in the application were based on <br /> analytical results of air samples collected during feasibility tests conducted during <br /> P 1Bp-Arco for URS161=Correspondencc Amo 6100 ATC Addendum doc <br />