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PRE-TANK REPLACEMENT Site Assessment Results 880 VICTOR ROAD LODI, CA. Aegis Project No. 89-014 Page 16 5.0 CONCLUSIONS/RECOMMENDATIONS Four single-walled-steel underground fuel-storage-tanks exist at the site. The minimum age of the tanks is 19 years. Fourteen soil borings indicate that the site is underlain by two soil units. The upper soil unit consists of interlayered predominantly fine grained soil types including sandy silt, silty sand, silt and clayey silt. The lower soil unit consists of medium to coarse grained sand which is laterally continuous beneath the site. Petroleum hydrocarbons are not present in native soils at or above detection limits at the explored locations. Because of the coarse nature of the lower soil unit and the locations of the soil borings, an assessment of the condition of fill material surrounding the under ground storage tanks and the native soils directly beneath the tanks was not made. Because of the of the age of the underground storage tanks it is anticipated that a certain amount of fill material containing petroleum hydrocarbons will be generated during tank replacement activities. Calculations were preformed to estimate the maximum volume of soils containing petroleum hydrocarbons that could be generated during the proposed tank replacement activities. Calculation sheets are included in Appendix E. Approximately 810 cubic yards of soils containing petroleum hydrocarbons could be generated during the tank replacement activities. The amount of soils containing petroleum hydrocarbons could be reduced if the soils are screened with a PID during excavation and segregated according to organic vapor content. Soil management alternatives should be considered before excavation at the site. The two options for handling soils containing petroleum hydrocarbons available in San Joaquin County are (1) on-site aeration and (2) hauling the soils under a hazardous waste/non-hazardous waste manifest directly to a licensed Class II disposal facility. 1) on-site aeration. On-site aeration of soils containing petroleum hydrocarbons is currently being permitted through the San Joaquin County Air Pollution Control District (SJCAPD) . After excavation the soils will be stockpiled on site sampled and covered with plastic. Upon analytical confirmation of the levels of petroleum hydrocarbons in the soils a permit application for authorization of uncontrolled aeration will be submitted to the SJCAPD. The time period for approval of the permit is typically two weeks. Aeration of the soils would be allowed in batches. It is difficult to estimate the allowable amount of soil to be aerated per day from currently available data. Typically the aeration process is three to six weeks depending on the amount of soil,