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' AUGEAS Corporation A California Natural Products Problem Assessment Report June,1991 2.O CONCLUSIONS AND RECOMMENDATIONS Based on the scope of work performed during this investigation, the following conclusions were developed: 1. An undetermined amount of gasoline has leaked from an underground product line leading from a 2,000-gallon twin-compartment above-ground fuel storage tank.The tank,fuel dispenser and product line were moved on July 26,1990.The tank and dispenser were intact;leakage occurred directly from the ends of the 18-inch long product line. The tank had not been in use since 1985. The tank was removed from the property for disposal on August 7, 1990. 2. The leakage of gasoline has spread laterally as well as vertically through the near-surface sandy soils contaminating over 10,000 cubic yards of soil.The concentration of gasoline remaining in the soil,locally exceeding 2,500 ppm, remains a potential threat to further groundwater contamination. a. 3.Although no free product was found on the surface of the water table,aromatic hydrocarbon compounds were found dissolved in the groundwater in two of the three monitoring wells. The levels of benzene present in the samples taken were above state action levels. Augeas Corporation recommends a two-phase final Remedial Plan designed to eliminate both the soil and groundwater contamination found at the site.Although the aspects of soil remediation will be discussed in more detail in the Final Remedial Plan (Appendix 1), the overall program will include the following tasks: Phase 1 Task 1 - Soil venting/vapor extraction to be applied to the soil between the buildings. The soil venting process is discussed further in Appendix 1, and represents the primary action proposed for site remediation.Soil beneath the concrete slab buildings will be considered encapsulated and will not be considered further.This contamination is expected to degrade through natural biologic activity in the soil, and should not pose a threat to groundwater quality.