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Site Investigation Report <br /> BP Oil Site No 11191 <br /> Stockton, California <br /> C A M B R I A March 291 2002 <br /> RECOMMENDED ACTIVITIES <br /> Groundwater Monitoring Activities <br /> Each quarter, groundwater samples will be collected from selected site wells and analyzed for <br /> TPHg by modified EPA Method 8015, and BTEX, MTBE, and TBA by EPA Method 8260 <br /> Groundwater monitoring activities will be described under separate cover <br /> Investigation Activities <br /> To confirm hydrocarbon concentration trends and groundwater flow direction, one additional <br /> groundwater quarterly monitoring event will be conducted Based on the data collected, we will <br /> submit a Supplemental Investigation Work Plan following review of the second quarter 2002 <br /> monitoring results <br /> Interim Remedial Action Activities <br /> During the next groundwater monitoring event, samples will be collected from well MW-3 to <br /> profile water for recycling at the TOSCO refinery in Rodeo, California Upon profile approval, <br /> batch groundwater extraction events will be scheduled In addition, we are evaluating soil vapor <br /> extraction and/or dual-phase extraction pilot testing at the site <br /> ATTACHMENTS <br /> Figure 1 —Vicinity Map <br /> Figure 2—Site Plan <br /> Figure 3 --Groundwater Elevation Contour Map <br /> Table 1 —Well Completion Data <br /> Table 2—Water Level Elevation Data <br /> Table 3 —Soil Analytical Data <br /> Table 4—Groundwater Analytical Data <br /> Table 5 —Comparison of Soil Analytical Data <br /> 7 <br />