Carson Air Harbor - Phase I

-       Advanced five soil borings to test for soil type and petroleum impacts using Cone Penetrometer Test (CPT) and Rapid Optical Screening Tool™ (ROST™) technologies

-       Installed and sampled 13 groundwater monitoring wells to varying depths

-       Chemically analyzed soil, groundwater, and  residual petroleum samples collected from onsite groundwater monitoring wells

Summary of Results:  The Carson Air Harbor historical operations were limited to commercial activities with no known use of the type of petroleum compounds detected in the channel.  Minor residual petroleum was observed in only one groundwater well near the center of the property; however, forensic analysis revealed that this material is different from the petroleum compounds detected in the channel.  Furthermore, other soil and groundwater impacts observed at this Site appear to be highest along the perimeter of the property near petroleum pipeline corridors beneath Carson and Perry Streets.  On the basis of these observations, it appears that potential historical releases from the Carson Air Harbor Site are not related to the seepage of petroleum into the channel.