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Corrective Action Closure Report June 11, 1993 BP Chemical Facility (SJCEHD Site Code 2042) Page 3 CORRECTIVE ACTIONS Soil Excavation On December 28, 1992, and January 5, 1993, the former UST excavation was further excavated to remove soil containing residual concentrations of petroleum fuel hydrocarbons. Excavation work was performed by ALLPRO Environmental (Martinez, California). The north, south, and east sides of the former excavation were extended approximately three feet. The bottom of the excavation was extended approximately two additional feet. Because higher concentrations of residual hydrocarbons were detected at the western portion of the excavation, the west side was extended approximately 10 feet. A total of approximately 150 cubic yards of soil was excavated during the extension of the former UST excavation. The additional excavated soil was placed in a stockpile onsite. All stockpiled soil was placed on and covered with polyethylene plastic sheeting. The stockpiled soil was sampled and analyzed to evaluate treatment and disposal alternatives. Soil Sampling and Analysis �r On December 28, 1992, after the excavation had been extended by approximately three feet along each sidewall and two feet from the bottom, soil samples were collected and analyzed by a on-site mobile state-certified laboratory. One sample from each sidewall and two samples from the excavation bottom were collected (Figure 1). Each sample was tested for benzene, toluene, ethylbenzene, and xylenes (BTEX) and total petroleum hydrocarbons (TPH) as gasoline. Based on the analytical results from the mobile laboratory, soil samples with concentrations below the cleanup goals were subsequently submitted for analysis of ethylene dibromide and total lead. On December 28, 1992, the initial sample from the west wall (Sample ID 1WW) contained hydrocarbons above the cleanup goals. The west wall of the excavation was extended approximately two additional feet, and a second sample collected (Sample ID 2WW) and analyzed. The results indicated that Sample 2WW also contained hydrocarbons above the cleanup objectives. On January 5, 1993, the western wall of the excavation was extended approximately six additional feet. A sample from the west wall (Sample ID 3WW) was collected and submitted for chemical analysis. Samples of the stockpiled soil were also collected and analyzed. A representative from the SJCEHD was present and observed the soil sampling procedures and sample locations. The analytical results are presented and discussed below. CACRD074.DK GROUNDWATER _ �__TECHNOLOGY, INC.