ARCHIVED REPORTS_FEASIBILITY STUDY AND CORRECTIVE ACTION PLAN

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2.4.3 POTENTIAL VAPOR RECEPTORS As discussed above, the subject site is an operating terminal located in an industrial area on Rough and Ready Island in Stockton. Site workers are significantly more likely to be exposed to vapors in the course of terminal operation than by soil vapors emanating from the subsurface. Therefore, vapor intrusion is considered an incomplete pathway. Available soil vapor sampling data are presented in Table 6. 2.4.4 SURFACE WATER BODIES The eastern portion of the island is bordered by the San Joaquin River on the north and Burns Cutoff on the south (Figure 1). This section of the San Joaquin River channel is used for access to the Port of Stockton, located one mile to the east of the site. As discussed below, constituents of concern (CDCs) are delineated in the down-gradient direction,and this pathway is incomplete. 3.0 REMEDIATION HISTORY 3.1 1987 SEPARATE PHASE HYDROCARBON (SPH) RECOVERY During 1987, an SPH recovery program was initiated, and product was recovered from wells MW-1, MW-15, and MW-17. Extracted fluids were transported to Shell's Martinez refinery for recycling. 3.2 1993 TO 2005 GROUNDWATER EXTRACTION (GWE) OPERATIONS GWE began at the site in early 1993. The pumping wells were MW-1, MW-23, and MW-24. The GWE system was shut down after two months of operation due to limitations placed on the treatment of wastewater at the Shell refinery. A surface water discharge permit was obtained, and the GWE system was restarted during November 1994. Two additional extraction wells, MW-11 and MW-16, were added to the systen-L Treated groundwater was discharged to the Stockton Deep Water Channel under a National Pollutant Discharge Elimination System (NPDES) permit. During April 1995, well MW-17 was added to the GWE system. During the third 241729(33) 5 CONESTOGA-ROVERS S ASSOCIATES