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IWO RECEIVED <br /> JUL 2 4 19'J1 <br /> XTECOMMO"WAAWC. <br /> 26s AftW H mm Rd _ <br /> Suite 101 <br /> SWft Aft CA OW <br /> (,W)438-7511 <br /> FAX(108)438-7515 �e <br /> 7-1. <br /> 18 July 1991 OCT 17 1991 <br /> ENVIRONMEN IAL HEALTH <br /> Mr. Glenn Dembroff r�;,;vii i/SERVICES <br /> Ultramar Inc. <br /> P. 0. Box 466 <br /> Hanford, California 93232-0466 <br /> SUBJECT: EXECUTIVE SUMMARY of Interim Remedial Plan For <br /> Beacon Station 695 at 900 South Cherokee Lane, <br /> Lodi , California <br /> Dear Mr. Dembroff: <br /> EVAX Technologies, Inc. (EVAX) was retained by Ultramar Inc. (Ultramar) <br /> to manufacture, install , and operate an interim remedial system at Beacon <br /> Station 695. Owned and operated by Ultramar, the Beacon station is <br /> located at 900 South Cherokee Lane in Lodi, San Joaquin County, <br /> California. <br /> Results of a soil gas survey by EVAX in November 1990 outlined a zone of <br /> hydrocarbon impacted soils in an area encompassing the underground fuel <br /> storage tanks and service islands. A performance test was conducted <br /> concurrently with the soil gas survey and results indicated favorable <br /> soil conditions for vapor extraction remediation. <br /> ' EVAX proposes a vapor extraction system equipped with a catalytic <br /> incinerator to remediate in-situ, hydrocarbon impacted soils at the site. <br /> A total of 6 temporary vacuum probes and 16 monitoring/vapor extracti-on_ <br /> wells will be used to extract hydrocarbon vapors from soils. Hydrocarbon <br /> vapors will be extracted by vacuum and pumped via underground piping to a <br /> catalytic incinerator with a 500 cubic feet per minute capacity. <br /> Oxidation reactions in the catalytic incinerator will result in the <br /> abatement of hydrocarbon gases. The abated gases are then discharged <br /> directly into the atmosphere. <br /> An assessment of the public health risk due to possible atmospheric <br /> emissions of benzene, a hydrocarbon fuel constituent, was done based on <br /> Air Resources Board version of the dispersion PTPLU model . Maximum 1 <br /> hour ground-level benzene emissions were converted into excess cancer <br /> risk using procedures outlined in the CAPCOA Air Toxics Assessment <br /> Manual . Risk assessment results suggested a maximum excess lifetime <br /> cancer risk of less than 3.5 cases per million of population. The <br /> estimated risk was found to be below the risk criteria developed by the <br /> Bay Area Air Quality Management District. <br />