ARCHIVED REPORTS_PHASE II ENVIRONMENTAL SITE ASSESSMENT

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W GIR. • Southwest, Inc. August 1996, and 93 cubic yards of impacted soil were excavated, stockpiled, mixed several times to enhance bioremediation and returned to the excavation. A subsequent subsurface investigation indicated significant contamination was still present in the pea gravel at the bottom of the former excavation and in the surrounding soil and groundwater. Three monitoring wells were installed and monitored for a period of one year. Diesel was identified as the major contaminant, although gasoline-range hydrocarbons and methyl-tertiary-butyl ether (MTBE) were also detected in soil and groundwater. Levels of diesel in groundwater remained essentially the same or decreased slightly during the year of monitoring, and the UST case was closed by the CVRWQCB and SJCEHD in 2004. Records confirming that the monitoring wells were abandoned were not located during the Phase I; however, the wells were not observed in the field, and records show that the governing agencies approved well abandonment and provided guidelines to the consultant to do so. According to a letter prepared on behalf of Learner by Miller Brooks Environmental, Inc. (Miller Brooks) for the DTSC, there was a release of polychlorinated biphenyls (PCBs) on the Learner site on August 15, 2007. The release reportedly occurred in the area of the old auto shredder when a switch gear that was filled with oil was damaged during demolition. Site • personnel estimated 60 to 120 gallons of oil containing PCBs spilled onto the ground and flowed northward into a concrete sump located beneath the shredder. The SJCEHD was notified of the release by Learner. On September 17, 2007 the SJCEHD issued a Notice to Abate Immediately to Learner and referred oversight of the investigation and cleanup to the DTSC and the CVRWQCB. The investigation and cleanup are being conducted by Miller Brooks. During this Phase II ESA, it was noted that the shredder and adjacent mill had been dismantled and removed from the site. An excavation marked with grid lines was observed in and to the east of the area formerly occupied by the shredder. Work on the excavation was not observed during the Phase II fieldwork, but WGR was informed by representatives of Learner and Miller Brooks that the excavation was being directed by Miller Brooks to remediate the August 2007 PCB spill. At the time of the Phase II fieldwork the excavation did not extend into groundwater. A number of 20-yard hazardous waste containers were observed in the eastern part of the Learner site, and WGR was informed by a Miller Brooks representative that the containers were filled with soil removed from the remedial excavation. On May 16, 2008, during the last day of drilling, WGR observed one of the containers being loaded and removed from the site. • 704. PRI.05 6 July 21, 2008