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Gtologi t r"kwa lac. Page 13 Site Conceptual Model Report Marcs Property Protect No 701 2 August 23,2004 ' • Due to the lack of cross correlation between the individual boreholes the transport ' mechanisms/pathways for contaminant migration have not been determined with confidence. • The main conclusion for this conceptual model is that more detailed subsurface investigation needs to be performed to fill in the data gas Identified above i r 5.0 RECOMMENDATIONS Our recommendations are based on our knowledge of site conditions, and on the state and ' limitations of subsurface investigative technology Based on the conclusions outlined above, Geological Technics Inc recommends the following ' • Perform a San Joaquin County file review of underground storage tank files to determine if additional UST or piping schematics, or soil sample data are available • Perform a Cone Penetrometer Testing (CPT) investigation to resolve gaps in our ' understanding of the site lithologic profile Figure 13 includes locations of proposed CPT borings • Obtain soil and groundwater samples during the CPT investigation to further define the soil and groundwater plumes o Once the CPT data have been evaluated,update the site conceptual model • Evaluate cleanup technologies and prepare a feasibility study plan for remedial action 6.0 LIMITATIONS tThis report was prepared in accordance with the generally accepted standard of care and practice in effect at the time Services were rendered It should be recognized that definition ' and evaluation of environmental conditions is an inexact science and that the state or practice of environmental geology/hydrology is changing and evolving and that standards existing at the present time may change as knowledge increases and the state of the practice continues to ' improve Further, that differing subsurface soil characteristics can be experienced within a small_distance-and therefore cannot be-known-In an absolute sense All conclusions_and recommendations are based on the availble data and information. _ 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