ARCHIVED REPORTS XR0001794 - Laserfiche WebLink

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Station No. 502, 35 N. Cherokee Lane, Lodi , - Interim Remediation Plan The influent level at the conclusion of the initial phase of remediation was less than 3,000 ppm. Consequently, the above process and emission rates are higher than what we actually expect to encounter. Deactivation When soil vapor levels have been reduced to an acceptable level , the system will be given a final monitoring and then deactivated. The above ground components of the system including the catalytic incinerator, the pump, accumulator, fence and propane trap wagon, will be removed from the site. The underground piping and manifold will remain in place and could be used for any potential future remediation, if necessary. PROJECT MANAGEMENT AND REPORTING Project Management will coordinate the system monitoring, review the results, implement compliance control , and submit summary reports to Ultramar. Project Management will also submit routine reports on the operation as required by the Air Pollution Control District. The project management function will be overseen by an EVAX Project Engineer. PUBLIC HEALTH RISK A screening level assessment of the public health risk due to the emission of benzene from the incinerator was undertaken using the ARB version of the dispersion model PTPLU. The maximum one-hour ground-level benzene concentration modeled by PTPLU was converted into excess cancer risk using the procedures outlined in the CAPCOA Air Toxics Assessment Manual . These procedures are quite conservative in nature and tend to overstate the actual risk by a large margin. The maximum benzene emission rates were risk screened using the risk criteria developed by the San Francisco Bay Area Air Quality Management District (BAAQMD). The BAAQMD generally considers projects with a cancer risk between I to 10 cases per million population to be acceptable, ' particularly if the operation is short-term and involves a T-BACT emissions control device. The risk assessment was based on an analysis of the benzene emissions since benzene has the highest cancer risk factor of the typical constituents of gasoline. The ratio of benzene to total hydrocarbons in this emissions assessment is typical of that found in gasoline. It was determined that the excess lifetime cancer risk associated with a benzene emission rate of 0.20 lbs/day was less than 3 cases per million population based on a continuous 70 year operation. This figure is well - 8 -