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' Fonicaf Technics inc. • • Pa-e zia SGWI Report ' Project No.: 774.2 April 1, 1999 ' • It is interpreted that residual oil contamination still remains in the soil below the depth of 12 feet. Groundwater 1 vels have subsequently risen to current depth of about 6 feet, trapping the residual inotor oil several feet below water table. ' • It is interpreted that the residual cil trapped in the soil below groundwater is slowly leaching out into the groundwater, resulting in a groundwater plume of very low concentration of oil. Recommendations Given the conclusions listed above, Geological Technics Inc. recommends that a risk assessment be performed,to include: 1. A Receptor/Well Survey • Municipal and private well survey in a 1,000 foot radius, with primary concern in a down gradient direction ' • Survey should determine location, onstruction, pumping rate and use of these wells • Sources of information will include: ■ State Water Resources well log files ' County well log files ■ City well log files ■ Adjoining properties that has undergone groundwater investigation and remediation — the closest site with monitoring wells is the former Mobile Oil Corporation bulk plant near the corner of Grantline Road and MacArthur Blvd. 2. A Contaminant Fate & Transport Analysis, which would include the following calculation: r • Contaminant mass estimate calcula Lions • Environmental degradation rates (use reference of "Handbook of Environmental Degradation Rates", 1991, by Howard,P. H., et al, Lewis Publishers) • Groundwater transport calculations (use information obtained from the Mobil Oil site) • Contaminant transport calculations (use information from Mobil Oil site and from site ' specific information) 3. A Work Plan would be prepared describing the parameters to be used in the risk analysis. ' 5.0 LIMITATIONS This report was prepared in accordance with the accepted standards and practices of the field ' of environmental geology, groundwater hydrology and good business practices. It should be recognized that definition and evaluation of environmental conditions is a difficult and inexact science. Judgments leading to conclusions and recommendations are generally made ' with an incomplete knowledge of the site-specific conditions present. The tasks proposed and completed during this project were reviewed and approved by the local regulatory agency for compliance with the law. No warranty, expressed or implied, is made.